What Is an Air Pressure Transducer?

Posted on June 8, 2021 by KimGuo11

An Air pressure transducer is a sensor that converts the mechanical signal of air pressure into a current signal. Pressure has a linear relationship with voltage or current, and it is generally proportional. Therefore, the output voltage or current of the transmitter increases as the pressure increases. From this, a relationship between pressure and voltage or current is derived.

RFQ More Pressure Sensor

Featured air pressure transducers

**SI-300 Pressure Transducer 4-20mA/Voltage**
The 4-20mA/ Voltage Pressure Transducer,
also called pressure transmitter 4-20mA,
is a pressure sensor with4-20ma/Voltage output.

**SI-390 Industrial Pressure Transmitter**
Pressure transmitters for general industrial applicaitons. -0.1kPa ~ 0 ~ 0.01kPa ~ 100MPa ~150MPa. 0.1% FS, 0.25% FS, 0.5% FS. 4-20mA (2-wire system), 0-5 / 1-5 / 0-10V (3-wire

**SI-503K Gas Pressure Sensor**
Gas pressure sensor for industrial gas pressure monitoring. Pagoda gas nozzle Φ8. Such sensors are also commonly referred to as wind pressure transmitters, exhaust pressure sensors.

**SI-702 High Pressure Sensor**
High pressure sensor is pressure transmitter designed for high pressure measure&control. 0 ～ 40MPa… 600MPa. M20 × 1.5, G1 / 2 (others are customized according to requirements)

**SI-702S Ultra-High Pressure Senors**
Pressure sensor for Ultra high pressure applications. Ultra high pressures up to 15,00MPa. 0-2000MPa to 0-7000MPa (customized).Ball head M20 × 1.5, cone head M20 × 1.5.

**SI-512H High Temperature Pressure Sensor**
High Temperature Pressure Sensor for pressure measurement of high temperature gas or liquid. Such as steam pressure. High temperature up to 800 ℃.

**SIJC-1000HSM-Silicon Pressure Sensor**
Silicon pressure sensor, also known as Diffused silicon pressure sensor. Silicon pressure sensors are low cost.

**SI-706 Combined Pressure and Temperature Sensor-Dual function**
Combined pressure and temperature sensor for Simultaneous measurement of pressure and temperature.
Thermocouple types: J, K, E type or PT100 platinum resistance. Two outputs do not affect each other.

**Absolute Pressure Transmitter**
Absolute pressure transmitter with 4-20mA output for measuring pressure with absolute type reference. Absolute pressure (AP) transmitter is a measure of the ideal (complete) vacuum pressure.

**Hydrostatic pressure transmitter**
Hydrostatic pressure transmitter is used for fluid hydrostatic pressure measurement. With working static pressure up to 32Mpa, for liquid, gas or steam .

Pressure transducer is a high-precision instrument that can perform on-site inspection of pressure parameters, and is widely used in industrial measurement and control processes. It can be used to measure the pressure, differential pressure and absolute pressure of various media such as liquid, gas and steam. Then the pressure signal is converted into 4-20mADC signal output to supply secondary instruments such as indicating alarm, recorder, regulator, etc. for measurement, indication and process adjustment.

Extended reading: extrusion melt pressure transducer

The functional principle of a resistive pressure transmitter is very simple. The pressure sensor converts the mechanical pressure value into a proportional electrical signal. The pressure sensor typically consists of a stable main body and a (thin) diaphragm.

The diaphragm is the most important element for the measurement of pressure and is equipped with strain-sensitive and compression-sensitive resistance structures, so-called strain gauges (DMS). The diaphragm is deflected under the influence of pressure.

Thus, the strain gauges attached to it are elongated or compressed and its electrical resistance changes. This change in resistance is directly proportional to the pressure. For example, if the resistors are wired to a Wheatstone measuring bridge, the resulting electrical signal can be measured and transferred to an indicator.

Extended reading: Pressure indicator transmitters

There are different types of pressure transducers based on their design.

These sensors can come in several shapes and sizes, but the technology inside can also differ.

There 4 main types of pressure sensors based on this:

Strain Gauge Pressure Transducers
Capacitance Pressure Transducers
Potentiometric Pressure Transducers
Resonant Wire Pressure Transducers

More about Industrial Pressure Sensors

Extended Reading: Electronic Pressure Switch for Air Compressor

The terms pressure sensor, pressure transducer and pressure transmitter are often used interchangeably. We usually define relevant measurement parameters and output signals to distinguish products.

Of course, if you want to strictly distinguish these three words from a technical point of view, you can refer to the following brief introduction:

PRESSURE SENSOR

Millivolt (mV) output signal (also a general term for all pressure types); a device that measures pressure.

The millivolt output signal can typically be used ten (10) to (20) feet away from the electronics without significant signal loss. The signal is proportional to the supply. A 5VDC supply with a 10mV/V output signal produces a 0-50mV output signal.

Older technologies such as bonded foil strain gage or thin film technology produce 2-3mV/V (millivolts per volt), whereas MEMS technology can produce 20mV/V reliably.

Millivolt output signals give the design engineer the flexibility to condition the output signal as their system needs it and can reduce package size and cost.

Extended Reading: 4-20ma pressure transducer wiring diagram

PRESSURE TRANSDUCER

High level voltage or frequency output signal including 0.5 to 4.5V ratiometric (output signal is proportional to the supply), 1-5V and 1-6kHz. These output signals should be used within twenty (20) feet of the electronics.

Voltage output signals can offer low current consumption for remote battery operated equipment such as wellhead SCADA systems.

Supply voltages are typically from 8-28VDC, except for the 0.5-4.5V output, which requires a 5VDC regulated supply.

Older voltage output signals, such as 0-5V, do not have a “live zero” where there is signal when the sensor is at zero pressure. The risk is that the system does not know the difference between a failed sensor with no output and zero pressure.

Extended Reading: Smart pressure transmitter

PRESSURE TRANSMITTER

Current output signal, i.e. 4-20mA (4 to 20mA), the current, rather than the voltage, is measured on the device, rather than the voltage; Sino-Inst pressure transmitters are two wire devices (red for supply, black for the ground).

4-20mA pressure transmitters offer good electrical noise immunity (EMI/RFI), and will need a power supply of 8-28VDC. Because the signal is producing current, it can consume more battery life if operating at full pressure.

Extended reading: Pressure Sensor Applications In Various Industries

Pressure Transducer is a device or device that can sense the pressure signal and convert the pressure signal into a usable output electrical signal according to a certain law. Pressure sensors are usually composed of pressure sensitive elements and signal processing units. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors.

Pressure sensor is the most commonly used sensor in industrial practice. It is widely used in various industrial automation environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, electric power, ships, machine tools , pipeline and many other industries, the following briefly introduces some common sensor principles and their applications. Another medical pressure sensor.

Our pressure transmitters can also be upgraded to Low power-battery powered Wireless Pressure Sensors.

The pressure switch adopts high-precision, high-stability pressure sensor and transmission circuit, and then uses the CPU modular signal processing technology to realize the detection, display, alarm and control signal output of the medium pressure signal.

Pressure switches can be widely used in petroleum, chemical, metallurgy, electric power, water supply and other fields to measure and control the gauge pressure and absolute pressure of various gases and liquids. It is an ideal intelligent measurement and control instrument for industrial sites. Pressure switches are widely used in aerospace and military fields, such as M1A1 tanks, Apollo spacecraft, Boeing 747, Airbus A320, F22, F117 and other product manufacturing.

A pressure switch is not the same as a pressure sensor:

(1) The pressure sensor is composed of a pressure-sensitive element and a conversion circuit. It uses the pressure of the measured medium to impregnate the pressure-sensitive element to produce a small changing current or voltage output.
(2) The pressure switch is a utility switch that automatically turns on or off when the set value is reached.

Extended Reading: strain gauge pressure transducer

What is the difference between a pressure switch and a pressure sensor

Difference in function

(1) As the name suggests, the pressure switch is a switch. It is just that the pressure is set in advance. When the measured medium reaches this pressure, the switch can be turned on or off automatically. The pressure switch must be given a pressure value in advance, and then open or close the switch. It is used for simple control, and it is all switching output.

(2) The pressure sensor can not only output analog signals, but also output digital signals. Digital signal processing is more convenient, and it can also be transmitted remotely. The pressure sensor is composed of a pressure-sensitive element and a conversion circuit. The pressure of the measured medium acts on the pressure-sensitive element to generate a small change of current or voltage output.

Price difference

The pressure sensor is naturally much more expensive than the pressure switch. Because the pressure sensor has an internal signal conditioning circuit. Considering the service life and safety, the pressure sensor is much more cost-effective than the pressure switch. The after-sales service, product reputation, The market difference is better than the pressure switch. Obviously, the pressure sensor is still the priority.

Differences in the mode of action

(1) The sensor often needs to be used in conjunction with an external amplifier circuit to complete the process from pressure detection to control and display. Since the pressure sensor is a primary component, the signal fed back by the pressure sensor needs to be processed, analyzed, stored, and controlled through the measurement and control system, so that industrial automation equipment and project operation control are more intelligent.

(2) The pressure switch does not need other cooperation. When the pressure is sensed, it can complete the work independently.

Extended reading: How to calibrate HART pressure transmitters

Air pressure transducer selection:

Measuring range (range)
The output signal, communication protocol, whether with display meter
Process interface (general, please provide thread specifications, flange type, provide specific flange standard, flange size, capillary length, process medium temperature, and other information)
Electrical interface
Installation method (horizontal installation or vertical installation)
Mounting bracket (flat bracket or L-shaped bracket, bracket material requirement: carbon steel or stainless steel)
Other requirements (explosion-proof, explosion-proof, lightning arrester, water, and oil prohibition treatment, etc.)

Tools for converting and calculating pressure values

Absolute pressure-Gauge pressure Converter	Pressure Unit Converter	Liquid Depth/Level to Hydrostatic Pressure Calculator
Differential Pressure Calculator	Pressure Transducer 4-20ma Output Calculator	Pressure to Liquid Level Calculator

More Pressure Measurement Products

**SI2088-W Wireless Pressure Transmitter**

**SI-1110 Wireless Pressure Transducer**

**Differential pressure(DP) level transmitter**

**Flange Mounted Differential Pressure Transmitter**

**Extended Diaphragm Seal DP Level Transmitter**

**Remote Seal Differential Pressure Transmitter**

**SI-PCM260 Deep Well Water Level Sensor**

**SI-302 Anti-corrosive Submersible Level Transmitter**

Frequently
Asked
Questions

Help Center

Here we briefly introduce the use of some pressure transmitters;

It is directly used for the measurement of various pressures: air pressure, water pressure, hydraulic pressure (including water pressure), various blood pressure measurement of people in life, etc.;
Pressure sensors are used in automobiles, some high-end motorcycles and almost all internal combustion engines;
Liquid level meter: Most of the field meters used for various liquid level measurement are also pressure sensors;
The source of the weighing signal of most electronic weighing scales and truck scales is also the pressure sensor.
Pressure sensors are also used for acceleration measurement in aviation and aerospace.

There are many others, too many to list.

There are two measurement methods:

Pass the current test of the multimeter, the steps are as follows:

The red test lead of the multimeter is connected to the hole of mA, and the black test lead is connected to COM.
Adjust the gear of the multimeter to the DC mA gear.
The red test lead of the multimeter is connected to the positive pole of the 4-20mA sensor output, and the black test lead is connected to the negative pole of the 4-20mA sensor output.
Read the reading from the display area of the multimeter, and the reading is the current value.

Through the multimeter’s 10,000-voltage range measurement, for the multimeter without the current test function, the current value can be measured by the voltage, and the steps are as follows:

At the output of the 4-20mA sensor, connect a sampling resistor of about 100 ohms.
The red test lead of the multimeter is connected to the hole of mA, and the black test lead is connected to COM.
Adjust the gear of the multimeter to DC V gear.
The red test lead of the multimeter is connected to the positive pole of the 4-20mA sensor output, and the black test lead is connected to the negative pole of the 4-20mA sensor output.
Read the reading from the display area of the multimeter, the reading is the voltage value, and the current value can be obtained by dividing the reading reading by the resistance value (such as 100 ohms).

Use the DC current function of the multimeter, 20mA gear (if not, choose 100mA gear), and you can directly test the sensor output. If it is a desktop digital multimeter, you can also use any sensor function to allow the instrument to directly test the physical quantity sensed by your sensor. Wiring method: red test lead to green wire, black test lead to yellow wire

The basic principle of the differential pressure transmitter is to divide a space with a sensitive element (multi-purpose bellows) into two chambers. When pressure is introduced into the two chambers, respectively, the sensor produces displacement (or a tendency to displace) under the combined action of the two pressures. This displacement is proportional to the pressure difference (differential pressure) between the two chambers. Convert this displacement into a standard signal output that can reflect the magnitude of the differential pressure.

Potentiometer-based calibration
Some pressure sensors have screws for zero adjustment, span adjustment, or both. Turning these screws will adjust the low end output (zero adjustment) or the high end output (span adjustment).

Typically, these screws are located on the PCB inside the sensor body. If you want to adjust the output, you need to follow these steps:

Turn on the sensor without disconnecting the PCB output port.
Accurately apply zero and full scale pressure to the sensor. (A minimum ±0.1% full scale accuracy of applied pressure is recommended.)
Connect the sensor to appropriate power and monitoring equipment to verify the output of the pressure sensor.
Adjust the zero output first, then adjust the full scale output.
Tools such as DC power supply, multimeter, pressure comparator are required.

Electromagnetic based calibration
Instead of using potentiometers, some pressure sensors use magnets for decay. Magnet-based calibration comes in two flavors: magnet and shunt calibration (often called shunt calibration).

A small magnet is usually placed near the top or bottom of the pressure sensor to increase or decrease (respectively) the zero output of the pressure sensor. Generally speaking, the full-scale output of this type of sensor can usually only be adjusted by the factory. If you want to adjust, you need to follow the steps below:

Precisely apply zero pressure to the sensor. (We recommend a full-scale accuracy of at least ±0.1% of applied pressure.)
Connect the sensor to appropriate power and monitoring equipment to verify sensor output.
To turn down the zero output, hold the magnet perpendicular to the lower end of the device.
To turn up the zero output, hold the magnet perpendicular to the upper end of the device.
If the zero output is 0 (eg, 0 VDC, 0 mV, etc.), the magnet adjustment of the zero output can be a bit of a hassle. When the zero output is non-zero, on a 1-5 VDC sensor, the actual value is less than the zero output (0.995 VDC, 0.85 VDC), so you can tell when the value is adjusted too far and the output needs to be restored. When the zero output is 0, there is no that extra buffer below the zero output and can be adjusted to a value that can only be pulled back by the factory.

Calibration with software
It should be easy to adjust the zero and full scale outputs for sensors connected to monitoring software. For example, software that controls a 4-20 mA sensor might have a 4 mA calibration setting and a 20 mA calibration setting. In this way, software control does what shunt calibration and previous calibration techniques do: it adjusts the sensor’s output, as well as controls the device’s reading of the output.

To calibrate a software-controlled sensor, follow these steps:

Connect the sensor to the control software
Accurately apply zero and full scale pressure to the sensor. (A minimum ±0.1% full scale accuracy of applied pressure is recommended.)
Using the software, adjust the zero and full scale output calibration variables until the corresponding output from the sensor is correct.

Pressure sensors are generally divided into two-wire, three-wire, four-wire, and some five-wire systems.

The two-wire system of the pressure sensor is relatively simple, and ordinary users know how to wire it. One is connected to the positive pole of the power supply, and the other wire is connected to the negative pole of the power supply through the meter. This is the simplest.

The three-wire pressure sensor is to add a line on the basis of the two-wire system. This line is directly connected to the negative pole of the power supply, which is more troublesome.

The four-wire pressure sensor has two power input terminals. The other two are signal output terminals. Most of the four-wire systems are voltage outputs. Instead of 4~20mA output. 4~20mA is called pressure transmitter, most of which are two-wire system.

The signal output portion of the pressure sensor is not amplified. The full-scale output is only tens of millivolts. Some sensors have an internal amplifier circuit, and the full-scale output is 0~2V.

For how to connect the display meter, it depends on the range of the meter. If there is a gear suitable for the output signal, you can measure it directly. Otherwise, you need to add a signal conditioning circuit. The five-wire pressure sensor is different from the four-wire type, and there are fewer five-wire pressure sensors on the market.

Read more about: What Is 0-10V Signal Output?

Steam Pressure Transmitter

Posted on June 7, 2021 by KimGuo11

Steam pressure transmitters are widely used in the measurement and control of various high-temperature steam piping systems. The monitoring of steam pipes is very important. To measure the pressure of steam pipes, have you encountered the following problems:

Don’t know which pressure transmitter to choose?
Is it good to use a high-temperature pressure transmitter to measure the pressure of the steam pipe?
The core of the pressure transmitter removed at the steam site. The diaphragm has been dented by the impact. Is it scrapped directly?
How to choose the type and what should be paid attention to when measuring the steam pipeline?

RFQ More Pressure Sensors

Steam pressure transmitter performance

The tested medium is widely used. It can test steam, oil, water, and pastes compatible with 316 stainless steel and 304 stainless steel. It has a certain anti-corrosion ability.
High accuracy, high stability, use imported original sensors. Good linearity. High temperature resistance and high stability.
Small size, light weight, easy to install, debug and use
Stainless steel fully enclosed shell, good waterproof.
The pressure transmitter directly senses the pressure of the measured liquid level and is not affected by the bubbling and deposition of the medium.
The overall performance in the industrial field is ±0.15%, so that the loop performance is optimized
Five-year stability ±0.15%, which can greatly reduce the cost of calibration and maintenance
Faster dynamic response reduces process variability
The introduction of technology can realize a comprehensive measurement plan
Local/external: zero/range adjustable

Extended Reading: Smart pressure transmitter

Related Products:

**High Frequency Dynamic Pressure Sensor**

**SI-350 Sanitary Pressure Transmitter**

Extended reading: Featured Diaphragm Seal Pressure Transmitters

Steam pressure transmitter installation

When wiring, pass the cable through the waterproof connector (accessory) or flexible tube and tighten the sealing nut to prevent rainwater from leaking into the transmitter housing through the cable.
Prevent the pressure transmitter from contacting corrosive or overheated media;
When measuring the liquid pressure, the installation position of the transmitter should avoid the impact of the liquid (water hammer phenomenon) to avoid damage to the sensor overpressure;
When measuring the liquid pressure, the pressure port should be opened on the side of the processing pipeline to avoid precipitation and slag;
When measuring gas pressure, the pressure tap should be opened at the top of the process pipeline. The transmitter should also be installed on the upper part of the processing pipeline. So that the accumulated liquid can be easily injected into the processing pipeline;
Prevent dross from depositing in the duct;
When measuring steam or other high-temperature media, a buffer tube (coil) and other condensers should be connected. The working temperature of the pressure transmitter should not exceed the limit;
When freezing occurs in winter, the transmitter installed outdoors must take anti-freezing measures. Avoid volume expansion of the liquid in the pressure inlet due to icing, leading to damage to the sensor;
The pressure guiding tube should be installed in a place with small temperature fluctuations;

Read more about: What is a pressure sensor and how it works?

What should be paid attention to when measuring the pressure on the steam pipeline?

Pressure transmitters are used for steam metering and pipeline monitoring.

The temperature in the steam pipeline is generally relatively high. The low is more than one hundred degrees Celsius, and the high is two to three hundred degrees Celsius.

The start and stop of the valve will also cause the pressure in the pipeline to fluctuate.

Today we are going to talk to you about what to pay attention to when measuring the pressure of steam pipes?

When measuring the pressure of the steam pipeline, a high-temperature pressure transmitter should be selected due to the high-temperature environment.

In fact, in steam conditions, it only needs to pass through the surface bend (condensation tube). After passing through the elbow, the steam will condense into water at the elbow. Insulate the temperature, so as to achieve a good cooling effect.

The pressure transmitter after passing through the elbow on the pipeline with insulation layer is basically at room temperature. If it is not insulated, the high temperature will rise, causing the temperature of all objects above the pipeline to rise.

Advantages: The use of bends can optimize the cost, and is compatible with the product.

The material selection of a good bend is high. It is thicker and more durable than the general watch bend on the market. Good pressure resistance. The price will be slightly more expensive.

Extended Reading: FMCW Radar for High Temperature Level Sensor

The above-mentioned pressure transmitter diaphragm damage is due to the phenomenon of water hammer.

The valve suddenly opens or closes, causing the pressure in the steam pipe to fluctuate suddenly.

Especially when the valve is opened, huge pressure fluctuations will cause the pipeline to vibrate violently. Even shocking.

The pressure transmitter will also withstand huge pressure in the pipeline. In severe cases, the core may be dented or even burst.

The prevention method is to install safety valves and accumulators, and open and close the valves slowly. Install a trap at the high point of the air discharge valve at the low point.

Some pressure transmitters will be protected by dampers and baffles.

The damper is a copper piece with a 4mm outer wire and a T-shaped thin through-tube structure inside. It can prevent the medium from directly impacting the diaphragm.

The baffle is placed on the front end of the core before assembling the core. Metal plate with holes. It also prevents the medium from directly impacting the diaphragm.

In the hydraulic machinery industry, there are a lot of equipment for pressure transmitters, which are often used for pressure control.

But hydraulic machinery is very prone to pressure shock when it is working. The shock pressure will far exceed the normal pressure, causing damage to the pressure transmitter.

In this case, some pressure transmitters have internal wires and dampers in the standard pressure port. Can effectively alleviate the impact.

The hydraulic and mechanical pressures are all above 10MPa. Generally, the transmitter above 10MPa should be equipped with a damper as standard. If the pressure shock is severe, a baffle can be added to alleviate the shock.

Extended Reading: Electronic Pressure Switch for Air Compressor

Extended Reading: Up to 800°C High Temperature Pressure Sensor

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Extended Reading: Digital Pressure Sensor-RS485

Sino-Inst offers over 10 Steam Pressure Transmitters. A wide variety of Steam Pressure Transmitter options are available to you. Such as free samples, paid samples.

Sino-Inst is a globally recognized manufacturer of Steam Pressure Transmitters, located in China. Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Steam Pressure Transmitter products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting certified suppliers. With ISO9001, ISO14001 certification.

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drurylandetheatre.com

High Frequency Dynamic Pressure Sensor

Posted on October 13, 2020 by KimGuo11

Dynamic pressure sensor, the transmitter is a high frequency sensor.

The high frequency dynamic pressure sensor adopts silicon stack silicon technology. At the same time, it has high responsiveness. At the same time, it also has high accuracy in low frequency or static data. The high-frequency dynamic pressure sensor has its own hybrid temperature compensation, and the special processing can reach 2000℃ instantaneously. It can provide stable performance in a wide temperature range, with good linearity, high natural frequency, short rise time and wide excellent response frequency band.

Sino-Inst offers a variety of Dynamic Pressure Sensors for pressure measurement. If you have any questions, please contact our sales engineers.

Request a Quote

More Pressure Sensors

Features of High Frequency Dynamic Pressure Sensor

Wide measuring medium range
Wide pressure measurement range
High natural frequency up to 2MHz
Stable work
Strong anti-interference ability
Original imported components, reliable performance.
Small size, light weight, complete types, high cost performance

Read more about: What is a pressure sensor and how it works?

Specifications of High Frequency Dynamic Pressure Sensor

Measuring range	-100KPa~0~10KPa…200KPa…1MPa…100MPa
Type of pressure	Gauge pressure, absolute pressure, negative pressure
Long-term stability	Typical: ±0.1%FS, maximum: ±0.2%FS/year
Comprehensive accuracy	≤±0.25%FS, 0.5%FS (Comprehensive accuracy includes: linearity + repeatability + hysteresis)
Overload pressure	2 times full scale pressure (100MPa product overpressure is 1.1 times full scale pressure)
Ambient temperature	-20 … +85℃
Medium temperature	-40 … +85℃, special can be -10℃~200℃
Vibration influence	≤±0.01%FS (X, Y, Z axis, 200Hz/g)
Load Resistance	≤(U-12)/0.02Ω
Natural frequency	150KHz~2MHz
Transmitter frequency response	0~1KHz~200KHz
Rise Time	0~1mS~2μS
Zero temperature drift	Typical: ±0.02%FS/℃, maximum: ±0.05%FS/℃
Sensitivity temperature drift	±0.02%FS/℃, maximum: ±0.05%FS/℃
Resolution	Infinitely small in theory, usually 1/100000

Medium	Gas or liquid compatible with 316 stainless steel
Power supply	Transmitter power supply: 12~36VDC (generally 24VDC), ±15VDC switching power supply or linear power supply Sensor power supply: constant current: 1mA~4mA; constant voltage: 5VDC~24VDC
Signal output	Analog: 4~20mA, 1~5 V DC, 0~10VDC, 0~5V DC Sensor output: 1.5mV~15mV/V
Insulation resistance	100MΩ, 500VDC
Electrical protection	Reverse polarity protection, anti-electromagnetic interference
Liquid contact material	316L stainless steel
shell material	304 stainless steel
Process connection	M20*1.5, G1/4, flush film, other threads can be designed according to customer requirements
Electrical connection	The cable is IP67 and the connector connection is IP65
weight	0.25KG

Applications of High Frequency Dynamic Pressure Sensor

Military engineering
Chemical explosion test
Petroleum prospecting and well testing
Fluid mechanics
Internal combustion engine system
aerodynamics
Scientific tests such as hydraulic power machinery test
Chemical explosion test

More Featured Pressure Sensors

**SI-303 Low-Pressure Transducer**
Low pressure transducers for air and non-corrosive gases low pressure measurement. 0 ～ 2.5kPa to 0 ～ 30kPa measurable.

**SI-350 Sanitary Pressure Transmitter**
Sanitary Pressure Transmitter, also called tri clamp pressure transmitter,
is the pressure transducer with the flush diaphragm (flat membrane) as the pressure sensor.

**SI-338 Ceramic Pressure Sensor**
Ceramic pressure sensor is a pressure sensor refined from a thick ceramic base using a refined ceramic base. Cost-effective. Support OEM processing. 0-0.2MPa -…- 40MPa

Extended reading: Static pressure vs dynamic pressure vs total pressure

Intrinsically Safe vs Explosion Proof Pressure Transmitters

Posted on October 10, 2020 by KimGuo11

Intrinsically safe vs explosion proof is a common function of pressure transmitters. When pressure transmitters need to be used in high-risk and explosive places, you must know it!

The explosion-proof pressure transmitter is divided into: intrinsically safe pressure transmitter (explosion-proof mark Exia ⅡC T6 Ga), explosion-proof pressure transmitter (explosion-proof mark Exd ⅡC T6 Gb). Intrinsically safe pressure transmitters must be used with safety barriers. The connection terminals of explosion-proof pressure transmitters must have an explosion-proof electrical connector box and a solid shell.

Sino-Inst offers a variety of explosion-proof pressure transmitters. If you have any questions, please contact our sales engineers.

Request a Quote

More Pressure Sensors

Intrinsically Safe vs Explosion Proof

It is often necessary to use explosion-proof instruments in industrial sites. The general industrial explosion-proof instruments are mainly explosion-proof and intrinsically safe. So, how to understand the difference between them?

Different from the design concept:

Flameproof definition:

It can withstand the explosive pressure of internal explosive gas mixture. And can prevent the internal explosion from spreading to the explosive mixture around the enclosure of electrical equipment enclosure (zone I explosion-proof technology).

Dangerous gases are allowed to enter the flameproof enclosure, which may cause an explosion. However, the enclosure must have sufficient strength. And each shell joint surface must have a sufficiently long engagement length and a sufficiently small gap. To ensure that the internal explosion will not pass through the flameproof joint and cause the external environment to explode.

Clearance explosion-proof technology. Rely on the gap and mesh length to achieve the effect of cooling and flameout.

Definition of intrinsic safety:

Any electric spark or any thermal effect generated under the conditions specified in the standard (including normal operation and specified fault conditions) cannot ignite the circuits in the specified explosive gas environment (Zone 0/I explosion-proof technology).

It is a “safe” technology that uses suppression of ignition source energy as an explosion-proof method. It is required that the electric spark or thermal effect that the equipment may produce under normal operation or failure state are respectively less than the minimum ignition energy and self-ignition temperature of the explosive dangerous gas. For example: hydrogen 19uJ 560℃.

Intrinsically safe technology is actually a low-power design technology. Therefore, it can be well applied to industrial automation instruments.

Different from the application area

Explosion-proof applicable area: It can only be installed in hazardous locations in Zone 1 or Zone 2.

Intrinsically safe application area:

Exia: Equipment that can maintain explosion-proof performance until two components or other types of failures. Intrinsically safe equipment can be installed in hazardous locations in Zone 0, Zone 1, and Zone 2. Exia intrinsically safe equipment is the only explosion-proof electrical equipment that can be installed in zone 0.

Exib: Equipment that can maintain explosion-proof performance until a component or other type of failure. Intrinsically safe equipment can be installed in hazardous locations in Zone 1 and Zone 2.

Explosion Proof Pressure Transmitter

SIEP489 Explosion proof pressure Transmitter is a microprocessor-based high-performance transmitter. SIEP489 has flexible pressure calibration, push button configuration, and programmable using HART® Communication. We also supply industrial pressure sensors, and explosion proof differential pressure transmitter.

All our electronic pressure transducers can be offered with Explosion-proof. Select explosion-proof pressure transmitters with Ex d certification and 4-20mA output signals for installation. These installations require the use of equipment and enclosures designated as containing internal explosives. This prevents ignition of the explosive environment surrounding the equipment ( Specified) Flameproof area.

The application range of explosion-proof pressure transmitter is as follows:

Natural gas control system natural gas compressor dispenser;
Oil well platform wellhead pressure equipment blowout preventer pipeline equipment mine;
Storage and transportation monitoring of oil tanks and oil products, petrochemical equipment, oil refining;
Oxygen transmission system and pipeline, hydrogen equipment;
Power stations, boilers, thermal power units, etc.;
Petrochemical environmental protection air compressor light industry machinery metallurgy;
Other pressure measurement environments with explosion-proof requirements.

Of course, intrinsic safety and explosion-proof are not limited to pressure transmitters. Other industrial instruments have this function. To ensure the use of users in dangerous and harsh environments.

More Featured intrinsic safety and explosion-proof sensors

**Hygienic / Sanitary Pressure Transmitter**
Also called Hygienic pressure Transmitters, or tri clamp pressure transmitter. Sanitary pressure Transmitters is used to food &beverage or pharmaceutical application.

**High-Temperature Pressure Transmitter**
**High-temperature pressure transmitters** with a 4-20mA output.
which has a temperature capability of over 850 °C and is not pyroelectric.

LD series Rigid Probe Magnetostrictive Level Transmitter

LR series Integral flange Magnetostrictive level sensor

LT series Digital Display Magnetostrictive liquid level sensor

LP series Magnetostrictive Tank Level Indicator-PVDF/ PPH/ PTFE/ PFA/ PP

Sino-Inst offers a variety of Intrinsically Safe vs Explosion Proof Pressure Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.

KimGuo11

drurylandetheatre.com

How to Calibrate a Pressure Transmitter

Posted on October 9, 2020 by KimGuo11

What is Calibrate a Pressure Transmitter?

Calibrate a Pressure Transmitter is an important step to help pressure transmitters make accurate measurements. Only when the input and output are debugged together can it be called a true calibration. Including the pressure of the input transmitter, A/D conversion circuit, and loop current output circuit.

Pressure transmitter calibration is what you need to do before you install the pressure transmitters.

Technical Support Pressure Sensors

Pressure Sensor Calibration Case Share. The customer purchased a batch of high-frequency dynamic pressure sensors from our company. According to customer requirements, the accuracy of our pressure sensor is ±0.25% FS.

After the pressure sensor was produced, it was delivered to a third-party inspection company. The accuracy of the high-frequency dynamic pressure sensor was verified. As a result of the verification, the accuracy of our high-frequency dynamic pressure sensors has reached ±0.20% FS, and a calibration certificate is attached.

About High-Frequency Dynamic Pressure Sensor

The customer purchased our SI-90 high-frequency dynamic pressure sensor.

SI-90 High-Frequency Dynamic Pressure Sensor

The use of micro-machining technology makes the effective size of integrated silicon chips small, high natural frequency, and excellent elastic properties. Comprehensive performance is better than piezoelectric dynamic pressure sensors. It is the first choice for dynamic pressure measurement.

Measuring range	-100KPa~0~1KPa…20KPa…100MPa
Overload capacity	2 times full scale pressure (where the overpressure of 100MPa product is 1.1 times full scale pressure)
Type of pressure	Gauge pressure or absolute pressure
Measuring medium	Gas or liquid compatible with 316 stainless steel
Comprehensive accuracy	±0.1 %FS	±0.25%FS		±0.4%FS
Natural frequency	150KHz~700KHz	500KHz~1MHz		1MHz~2MHz
Transmitter bandwidth	0~1KHz~3KHz	0~20KHz		0~200KHz
Rise Time	0~0.2mS~75μS	0~12μS		0~1μS
Long-term stability	Typical: ±0.1%FS/year		Maximum: ±0.2%FS/year
Operating temperature	Generally -40℃~85℃		Special can be -10℃~250℃
Zero temperature drift	Typical: ±0.02%FS/℃		Maximum: ±0.05%FS/℃
Sensitivity temperature drift	Typical: ±0.02%FS/℃		Maximum: ±0.05%FS/℃
Power supply range	12~36VDC (generally 24VDC)		±15VDC standard switching power supply
Signal output	4~20mA / 1~5 V DC / 0~5V DC
Load Resistance	≤(U-10)/0.02Ω
Shell protection	The cable is IP67 and the connector connection is IP65
Vibration error	≤±0.01%FS (X, Y, Z axis, 200Hz/g)
Interface and shell	Stainless steel 1Cr18Ni9Ti
O-ring	fluororubber
Sensor diaphragm	Stainless steel 316L

Guess You’ll Like: Explosion Proof Pressure Transmitter

Pressure Transmitter Calibration Equipment

According to the description in “JJG882-2004 Pressure Transmitter Verification Regulations”. A pressure transmitter is an instrument that converts a pressure variable into a standardized output signal that can be transmitted. And there is a given value between its output signal and the pressure variable Continuous function relationship (usually linear function). Mainly used for the measurement and control of industrial engineering pressure parameters. Differential pressure transmitters are often used for flow measurement.

There are two types of pressure transmitters: electric and pneumatic. The standardized output signals of electric motors are mainly 0mA~10mA and 4mA~20mA (or 1V~5V) DC signals.

illustrate:

The two-wire pressure transmitter is a kind of electric type. Calibration should be carried out according to “JJG882-2004 Pressure Transmitter Verification Regulations”. The required equipment is as follows:

One DC 24V power supply;
One mA ammeter;
One voltmeter;
One standard pressure gauge;
One pressure source;
One piston pressure gauge (4 and 5 are optional when this option is available).

At present, the digital pressure calibrator integrates various functions such as DC24V, voltage measurement, current measurement, on-off measurement, etc. The equipment is constantly developing towards intelligence and miniaturization.

For example, you only need to configure the ConST273 intelligent digital pressure calibrator and the ConST100 series pressure pump. You can complete the HART intelligent pressure transmitter, ordinary pressure transmitter, precision pressure gauge, general pressure gauge, pressure controller, and other pressure instruments. Verification work.

Read more about: What Are 0-10V Pressure Transducers?

Pressure Sensor Calibration Certificate

Extended reading: Static pressure vs dynamic pressure vs total pressure

About the Third-Party Testing Company

The qualifications of the testing company are as follows:

More Featured Pressure sensors:

**SI-520 Digital Pressure Sensor**
Digital Pressure Sensor is particularly suitable for use in computer control systems. RS485 half-duplex working mode.

**SI-302 OEM pressure sensor**
OEM pressure sensors from Chinese manufacturer. Silicone filled. Protected by stainless steel diaphragm. Suitable for a variety of fluid media.

**SI-703 Flush diaphragm pressure sensor**
Flush membrane / diaphragm structure, anti-blocking design. Pressure measurement of viscous media.

**SI-10 Liquid pressure sensor**
Liquid pressure sensor is widely used for pressure measurement of various liquids. Like water or oils. IP68 waterproof.

How Do You Calibrate a Smart Pressure Transmitter?

Pressure Transmitter Calibration

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Sino-Inst offers over 20 Pressure sensors. A wide variety of Pressure sensors options are available to you. Such as free samples, paid samples. Sino-Inst is a globally recognized manufacturer of Pressure sensors, located in China.

Of course, according to your requirements, we can also provide Pressure Sensor Calibration Case: Third-party Calibration Certificate.

Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

KimGuo11

drurylandetheatre.com

Use Differential Pressure Transmitter to Measure Liquid Level

Posted on September 12, 2020 by KimGuo11

Differential Pressure Level transmitter for Continuous tank level measurement.

A liquid level measurement solution that prevents the measured medium from directly acting on the transmitter.itle

In the chemical production, the medium often encounters problems such as impurities, crystal particles or agglomeration. It is easy to block the connecting pipeline. At this time, a flange-type differential pressure transmitter is required.

Silicone oil is filled in the closed system composed of the bellows, capillary tube and measuring chamber as the pressure transmission medium. The measured medium does not enter the capillary tube and the transmitter to avoid blockage.

Differential Pressure Level transmitters are divided into single flange type and double flange type according to their structure.

Only a flange between the container and the transmitter is called a single flange differential pressure transmitter.

As for the closed container whose upper end is isolated from the atmosphere, the upper space and atmospheric pressure are mostly different. Two flanges must be used to guide the liquid and gas phase pressure to the differential pressure transmitter. This is the double flange differential pressure transmitter.

Differential Pressure Level transmitter for open containers

Open tank level measurement means that the tank is open to the atmosphere. Any change in atmospheric pressure will affect the process fluid pressure in the tank. In this liquid level measurement application, the low pressure side of the transmitter can measure the atmospheric pressure. This eliminates the influence of atmospheric pressure on the tank liquid level. The high-pressure side of the transmitter is connected to the tank. Therefore, the actual liquid level in the tank can be measured.

A single flange is used to measure the liquid level of an open tank.

Differential pressure range calculation method: Need to measure the height of the liquid level (unit: m) × acceleration of gravity (9.8) × measured medium density (unit: g/cm3) differential pressure range (unit: KPa).

The selection must know the measurement medium, measuring range, medium temperature, the size and pressure rating of the process connection flange, and the flange standard.

Image Source: https://www.yokogawa.com/in/library/resources/media-publications/how-to-avoid-temperature-effects-in-differential-pressure-level-measurements/

Extended Reading: Differential Pressure (DP) Flow Meters Technology

Differential Pressure Level transmitter for closed containers

For airtight containers, the inside is isolated from the atmosphere. When the process fluid fills or empties the tank, the pressure in the tank may change from positive pressure to vacuum. This change in tank pressure will directly affect the measured liquid level unless it is compensated for. This can be done by connecting the low-side pipe of the differential pressure transmitter to the top of the tank. Therefore, when measuring the liquid level of a closed tank, a differential pressure transmitter must be used.

Double flanges are used to measure the liquid level of a closed tank.

The calculation method of the differential pressure range: the height of the liquid level to be measured (unit: m) × acceleration of gravity (9.8) × (the density of the measured medium-the density of the capillary filling liquid) (unit: g/cm3) = differential pressure range (unit: KPa).

The selection must know the measurement medium, measuring range, medium temperature, pressure, capillary length, the size and pressure rating of the process connection flange and the flange standard

If you need to measure river water level, open channel level, etc. The Ultrasonic Liquid Level Sensor can be used for non-contact continuous level monitoring.

Differential pressure level transmitter working principle

When using Differential pressure (DP) level transmitter to measure the liquid level as shown in the figure below.
The measured liquid density in the figure is ρ.
The working medium density in the capillary of the double flange differential pressure transmitter is ρ0.
The measuring range of the measured liquid level is H.
The center distance of the sampling tube of the measured liquid level is h.
It can be seen from the figure that the maximum measurement range of the liquid level △ P = P + —P- = H × ρ × g-h × ρ0 × g.

It can be seen from the formula that the dual-flange differential pressure transmitter should perform negative migration. The migration amount S is h × ρ0 × g. And the installation position of the double flange differential pressure transmitter has no effect on the migration amount and the measurement result.

Extended reading: Hydrostatic Level Measurement

The dual-flange differential pressure transmitter requires negative migration.

When the measured liquid level is 0, the pressure difference between the positive and negative measurement chambers of the remote differential pressure transmitter is the largest. The output current of the double flange differential pressure transmitter is 4mA.

As the measured liquid level rises, the pressure difference between the positive and negative measurement chambers of the transmitter gradually decreases.

When the measured liquid level rises to the highest Hmax. The pressure difference between the positive and negative measurement chambers of the transmitter is the smallest. The output current of the double flange differential pressure transmitter is 20mA.

Extended Reading: Procurement Guide for Ultrasonic liquid level sensors

You may like:

Sino-Inst offers overs 100 DP transmitters for liquid level, pressure, flow, temperature measurement. Differential pressure (dp) level transmitters suit to measeure water and other liquid level.

A wide variety of DP level transmitters are available to you. Such as SMT3151LT Differential pressure level transmitter.

You can also choose from liquid flow meter and pressure transmitters, not specified. We are differential pressure level transmitter suppliers, located in China. The top supplying country is China(Mainland), which supply 100% of DP transmiters respectively.

KimGuo11

drurylandetheatre.com

MEMS Pressure Sensors

Posted on May 28, 2020 by KimGuo11

MEMS pressure sensors are pressure sensors manufactured using MEMS technology. MEMS pressure sensors include silicon piezoresistive pressure sensors and silicon capacitive pressure sensors.

MEMS pressure sensors are the earliest developed miniature sensors with a large market share. MEMS pressure sensors can be divided into piezoresistive and capacitive types. Both are micromechanical electronic sensors generated on silicon chips. MEMS pressure sensors can use high-precision, low-cost mass production with integrated circuit-like design techniques and manufacturing processes. This makes pressure control simple, easy to use, and intelligent. Compared with traditional mechanical quantity sensors, the size of MEMS pressure sensors is smaller, and the largest is no more than one centimeter. Compared with traditional “mechanical” manufacturing technology, its cost performance is greatly improved.

Sino-Inst offers a variety of MEMS pressure senors for industrial pressure measurement. If you have any questions, please contact our sales engineers.

Pressure Sensors

Featured MEMS Pressure Sensors

Industrial Pressure Sensor for OEM applications

Combined Pressure and Temperature Sensor-Dual function

Piezoresistive Differential Pressure Transmitter

Features of MEMS Pressure Sensors

Single crystal silicon sensor using German MEMS technology
Integrated sensor design using patented technology
Two-wire system. 4 ~ 20mA analog output. HART® digital communication or four-wire system. RS485 output (MODBUS protocol)

Read more about: What is a pressure sensor and how it works?

Specifications of MEMS Pressure Sensors

Range	Minimum range	DP	Range and sensor limit (kPa)	Minimum range	GP	Range and sensor limit (kPa)	Minimum range	AP	Range and sensor limit (kPa)
Code	（kPa）	Upper range (URL)	Lower limit of range (URL)	（kPa）	Upper range (URL)	Lower limit of range (URL)	（kPa）	Upper range (URL)	Lower limit of range (URL)
1	0.1	1	-1	/	/	/	/	/	/
2	0.2	5	-5	/	/	/	/	/	/
3	0.2	20	-20	0.2	20	-20	/	/	/
4	0.5	50	-50	0.5	50	-50	0.5	50	0
5	2	200	-200	2	200	-100	2	200	0
6	5	500	-500	5	500	-100	/	/	/
7	20	2000	-500	20	2000	-100	20	2000	0
8	100	10000	-500	100	10000	-100	100	10000	0
9	/	/	/	400	40000	-100	/	/	/

Measuring range of MEMS pressure sensor

Sensor type: German MEMS technology single crystal silicon sensor
Range ratio: 100: 01: 00
Accuracy grade: 0.075, 0.1, 0.2
Stability: 36 months error is ± 0.2% of maximum range
Temperature effect:
1. “0.075 level: zero point or range error is ± 0.15% / 28 ℃ of maximum range
2. 0.1 level: Zero point or range error is ± 0.2% / 28 ℃ of maximum range
3. Level 0.2: Zero point or range error is ± 0.25% of maximum range / 28 ℃ “
Output signal: “Two-wire system, 4 ～ 20mA DC, HAR T® protocol digital signal. Or four-wire system, RS485 output (MODBU S protocol)”
Metrology certification: CMC
Explosion-proof certification: “Explosion-proof type: Exd IIC T6 Gb
Intrinsically safe type: Exia IIC T6 Ga or Exib IIC T4 Gb “
Protection grade: IP67

What does MEMS mean?

MEMS is the abbreviation of Micro-Electro-Mechanical Systems. MEMS is the name of the United States. In Japan, it is called micromachine. In Europe, it is called microsystem. MEMS refers to mass production, which integrates micro-mechanisms, micro-sensors, micro-actuators, signal processing and control circuits, and interfaces. , Communication and power supply are equal to a micro device or system. MEMS is developed with the development of 1653 technology for semiconductor integrated circuit micromachining and internal ultra-precision mechanical processing technology. Currently MEMS processing technology is also widely used in microfluidic chips and synthetic biology. Chip integration of the technical process of the actual volume laboratory.

What is a MEMS pressure sensor?

MEMS pressure sensor is a pressure sensor manufactured by MEMS technology.
MEMS pressure sensors are the earliest developed miniature sensors with a large market share. The current application field has been greatly expanded, far beyond the traditional applications in industrial transmitters and other fields. Generally, MEMS pressure sensors are made by bulk silicon processing technology, and some are made by surface silicon processing technology. MEMS pressure sensors can be divided into piezoresistive and capacitive. Similar to other sensors, the MEMS pressure sensor converts the pressure into an electrical signal output during operation.

Extended Reading: Digital Pressure Sensor-RS485

Piezoresistive MEMS pressure sensor

The piezoresistive MEMS pressure sensor uses a high-precision semiconductor resistance strain gauge to form a Wheatstone bridge as a force-electric conversion measurement circuit. It has high measurement accuracy, low power consumption, and extremely low cost.

Capacitive MEMS pressure sensor

Capacitive pressure sensors use MEMS technology to produce a diaphragm grid on the silicon wafer. The upper and lower diaphragms become a group of capacitive pressure sensors. The upper diaphragm is displaced downward by pressure and changes the upper and lower diaphragms. The spacing of the grids also changes the capacitance between the plates, that is, △ pressure = △ capacitance

Read more about: Capacitive pressure transducer

How does a MEMS pressure sensor work?

The MEMS piezoresistive pressure sensor uses a circular stress cup silicon film inner wall fixed around the periphery. MEMS technology is used to directly engrave four high-precision semiconductor strain gauges on the surface with the highest stress. Make up the Wheatstone measuring bridge. As a force-electricity conversion measurement circuit. The physical quantity of pressure is directly converted into electricity. The measurement accuracy can reach 0.01% ～ 0.03% FS.

The MEMS capacitive pressure sensor uses MEMS technology to produce a diaphragm grid on the silicon chip. The two upper and lower diaphragms become a group of capacitive pressure sensors. The upper MEMS capacitive pressure sensors use MEMS technology to create a grid-like shape on a silicon wafer. The two upper and lower transverse barriers become a group of capacitive pressure sensors. The upper diaphragm is displaced downward by pressure. Changed the spacing between the upper and lower two horizontal barriers. It also changes the size of the capacitance between the boards.

Video on How MEMS Pressure Sensor Operation:

Video source: https://www.youtube.com/watch?v=juf4d3sgOJw

Applications of MEMS Pressure Sensors

Applied in the automotive industry
A new application of MEMS pressure sensors in automobiles is the transmission system pressure sensing. It is usually used in automatic devices. But it is also used in new dual clutch transmission systems. German manufacturers have introduced a MEMS solution that uses oil to protect the silicon film so that it can withstand pressures up to 70 bar. Bosch also brought huge changes to MEMS pressure sensors a few years ago. At that time, porous silicon was used to bring highly reliable MEMS devices. These devices have been used in current side airbag applications.
Applied to the medical market
The pressure sensor mainly serves as a disposable low-cost catheter for surgical operations. But they are also used in expensive equipment. Sensing pressure and differential flow in continuous positive airway pressure (CPAC) machines.
Applied in the industrial field
The main applications of MEMS pressure sensors include heating, ventilation and air conditioning (HVAC), water level measurement, and various industrial process and control applications. For example, in addition to accurate altitude and barometric pressure measurements, aircraft use sensors to monitor engines, flaps, and other components.

Extended reading: What is a pressure sensor?

Frequently
Asked
Questions

Help Center

Depending on the type of pressure to be measured:
Pressure transmitter types include gauge pressure, absolute pressure, and differential pressure. Gauge pressure refers to the pressure that is less than or greater than atmospheric pressure based on the atmosphere. Absolute pressure refers to the absolute zero pressure as the reference and is higher than the absolute pressure. Differential pressure refers to the difference between two pressures.
According to the working principle of the pressure transmitter:
Strain Gauge Pressure Transducers
Capacitance Pressure Transducers
Potentiometric Pressure Transducers
Resonant Wire Pressure Transducers

First of all, the parameters that must be seen when purchasing a pressure transmitter are:
Pressure range. Range. Measurement medium. Installation method-threaded flange clamps, etc. Installation dimensions. Temperature. Whether with display. Whether with HART protocol. Output type. Current output or voltage output. Explosion-proof level, protection level. Accessories. Mounting bracket.
The above parameters will affect the price of the pressure transmitter.
Sino-Inst, as the manufacturer of pressure transmitter, offer you with the best price.

At present, there are mainly two types of MEMS pressure sensors: silicon piezoresistive pressure sensors and silicon capacitive pressure sensors. Both of these are micro-mechanical electronic sensors produced on silicon chips.

The first type: silicon piezoresistive pressure sensor

The silicon piezoresistive pressure sensor uses a Wheatstone bridge composed of high-precision semiconductor resistance strain gauges as the measurement circuit for electromechanical conversion. It has the advantages of high measurement accuracy, low power consumption, and low cost. The output of the piezoresistive sensor in the wheatstone bridge is zero. If there is no pressure change, there is almost no power consumption.

The MEMS silicon piezoresistive pressure sensor is the inner wall of a silicon membrane with a circular stress cup fixed around it. Using MEMS technology, four high-precision semiconductor strain gauges are directly engraved on the place with the largest surface stress to form a Wheatstone measurement bridge. As an electromechanical conversion measurement circuit, it directly converts the physical quantity of pressure into electrical energy. Its measurement accuracy can reach 0.01-0.03%FS.

The second type: capacitive pressure sensor

The capacitive pressure sensor uses MEMS technology to make a horizontal grid shape on a silicon wafer. The upper and lower horizontal grids form a set of capacitive pressure sensors. The upper horizontal grid moves downward under pressure to change the distance between the upper and lower horizontal grids and the capacitance between the plates, that is Pressure = Capacitance.

MEMS pressure sensors can adopt the design technology and manufacturing process similar to integrated circuits, so as to carry out high-precision, low-cost mass production, and have a wide range of applications in ventilators, automobiles, earphones, mobile phones and other fields.

Application Analysis of Intelligent Pressure Transmitter

Posted on March 17, 2020 by KimGuo11

Intelligent Pressure Transmitter is also called smart pressure transmitter.

Current intelligent pressure transmitters are generally hybrid intelligent pressure transmitters that have both digital and analog signals. Communication with DCS is mainly based on passing 4-20mA analog signals. Then superimpose digital signals on them for remote Set the zero point, range, and calibration, configuration, and diagnostics of the transmitter. It is only designed to be compatible with the existing DCS. Smart pressure transmitter is a transition product of true all-digital smart pressure transmitter (such as field bus type intelligent pressure transmitter).

As far as the composition structure of intelligent pressure transmitters widely used in the market is concerned, it mainly includes devices such as microprocessors, sensors, digital-to-analog converters, and memories. Different devices play different automatic control functions. The sensors are mainly aimed at The measured signal is detected. There are some differences in the materials designed in the specific application. As the core part of the entire device, the microprocessor is mainly used for comprehensive analysis and calculation of the relevant data collected by the device. Unit conversion, fault diagnosis, range adjustment, function calculation, etc. are performed for the detection signal. The function of the memory is to implement the configuration for the relevant data and programs in the microprocessor. At present, most of the memory used by people have the function of rewriting and adjusting. Related converters are mainly responsible for the interchange of digital signals related to analog signal machines. Smart pressure transmitters can communicate with DCS by outputting a series of digital signals. A reserve power supply is also set in the transmitter, which can prevent the memory data from being lost in the event of a power failure. According to the different types of sensors used in smart pressure transmitters, the transmitters can also be classified into capacitive, diffused silicon strain, and diffused silicon resonant types.

Featured Smart Pressure Transmitters

**Diffused silicon Gauge Pressure Transmitter**
A gauge pressure (GP) transmitter compares a process pressure against local ambient air pressure. Gauge pressure transmitters have ports to sample the ambient air pressure in real-time.

**Explosion-proof Pressure Transmitter**
Explosion-proof Pressure transmitter, or explosion-proof pressure transducer, with the explosion-proof enclosure.
For applications in hazardous areas.

**Diaphragm Seal Pressure Transmitter**
When the process medium should not come into contact with the pressured parts of the measuring instrument. Diaphragm sealed pressure transmitters are used for pressure measurement.

**Capacitive Gauge Pressure Transmitter**
Gauge pressure (GP) transmitters compare process pressure with local ambient air pressure. Gauge pressure transmitters have ports for real-time sampling of ambient air pressure.

Function of Smart Pressure Transmitters

Type: Pressure- Differential(DPIT), Gauge/ Absolute(PIT), Level(LIT), High Static Pressure, Flow Pressure(FIT)
Certificate: SIL2 (TUV, FMEDA), Ex d, Ex ia, FM, ATEX, TR CU(EAC), INMETRO, CE, Rohs, BV, LR, KR, DNV, ABS, KCs, IP66/67, NEMA 4X
Feature: 4 to 20mA, HART, Loop Powered
Accuracy: ± 0.075% (option ± 0.04%) of CS* 3 lines LCD display, Self Diagnostic Function, External Buttons, DAC, Zero Trim, Eng mode
Application: Pressure, Flow, Level measurement for Oil & Gas, Liquid, Water, Maine & offshore, Vessel, Power, Chemical Plants and Refinery

More about: Absolute Pressure Vs Gauge Pressure.

Hydrostatic pressure for level measurement:

SMT3151TR Hydrostatic level transmitter-Rod Type

Main Features of Smart Pressure Transmitters

Compared with conventional analog transmitters, smart pressure transmitters have many characteristics. Take Rostman smart pressure transmitters as an example. The characteristics of this pressure transmitter are mainly concentrated on the following points:

1. Wide range and large range ratio

Intelligent pressure transmitters generally have a wide measuring range. The measuring range ratio is large, from 30: 1 to 100: 1, and some even reach 400: 1. The measuring range ratio of the transmitter refers to the maximum measurement range (URV) and the minimum measurement Range (LRV) ratio. Because the intelligent pressure transmitter has a wide measuring range, compared with conventional analog pressure transmitters, the biggest advantage is that it can reduce the inventory. At the same time, according to the process requirements, the measuring range can be changed at any time without following the meter change, without having to change the meter. Don’t worry about exceeding the range.

2.Simple and convenient maintenance

The handheld communicator can be used to communicate with the intelligent pressure transmitter at the terminal of the field transmitter or at the terminal in the control room of the main control room. In this way, the instrument maintenance personnel can perform range modification, parameter setting, and instrument maintenance on the transmitter in a relatively safe and relatively good control room.

3.With high and low voltage side conversion function

Intelligent pressure transmitters generally have high- and low-pressure side conversion functions of the sensor, and the internal parameters can be adjusted with a handheld communicator. I encountered such a problem in production. Because the meter has been running for many years, the pressure guiding tube connected to the transmitter needs to be replaced due to leakage. When the meter is put into operation after replacement, it is found that the positive and negative phase pressure guiding tubes are reversed (because the pressure guiding tube is long , And there is a heat tracing tube together, the positive and negative phases are easily reversed). The intelligent pressure transmitter has high and low pressure side conversion functions, as long as the parameter items in the table are changed from NORMOAL (high pressure on the right side, low pressure on the left side) to REVERSE (low pressure on the right side, high pressure on the left side). After reconfiguring the table, Everything works fine, saving time and effort.

4. With fixed output function

This function is more convenient to use in the following situations: When the transmitter fails, in order to ensure the safety of production equipment and personnel, or to ensure product quality, the transmitter output needs to be a fixed value. After the annual overhaul, due to the meter All links in the control circuit have been overhauled. The entire circuit needs to be co-calibrated before driving. At this time, the fixed output function of the intelligent transmitter can be used by the hand programmer. Generally, any value between 3.8-21.6mA can be set, and the whole circuit where it is located is cascaded.

In addition, the intelligent pressure transmitter has the characteristics of high accuracy, good stability and high reliability.

Extended Reading: Selection of pressure transmitter

Application Analysis of Intelligent Pressure Transmitter

Used as a reminder of impulse pipeline problems

In general, the intelligent pressure transmitter is connected to the process through a small-diameter pipe, and this management is the impulse pipeline. In some applications, such impulse lines may be blocked by materials or frozen due to cold weather. These blockages may cause difficulties in transmitting pressure signals. In this case, the use of conventional pressure transmitters cannot be used to understand this clogging problem. The main reason is that in the case of a blockage problem, there is a certain difference between the signal indicated by the transmitter and the signal provided before the blockage occurred. It must be ensured that the output of the transmitter does not change with the actual flow rate change before it can be found The problem. It has been found in practice that if one or two impulse lines are blocked during some flow measurement processes, the standard deviation at a specific flow will change greatly. The intelligent pressure transmitter can effectively detect such changes. In this way, the blocking position of the impulse pipeline can be controlled in time, which facilitates fault finding and avoids increasing problems.

For flame instability detection in refining furnaces

In many chemical fields, refining furnaces are important equipment. Incineration of different chemical production waste gases is required. Because many BTUs coexist, the flame stability is not very good, which is also an important sign that the refining furnace is out. The application of intelligent pressure transmitter can measure the noise of the fire control pressure in the room. The transmitter can be used to detect the flame stability. The general measurement accuracy is relatively high, and it can detect the abnormal signal in the refining furnace. . Convenient staff to correct equipment problems in time to avoid flameout.At present, smart pressure transmitters are also used in related fields to a certain extent, which belongs to the category of precision instruments. In many fields of application, smart pressure transmitters can accurately detect related signals and data information, find abnormalities in time, and facilitate Find and repair the corresponding faults. It is helpful to reduce system failures and improve system operation efficiency.

Q&A

What is smart pressure transmitter?

Digital smart pressure transmitter is pressure sensor with a 12-bit or higher microprocessor. Smart pressure transmitters are high performance microprocessor-based transmitters with flexibility. Pressure calibration and output, automatic compensation.
Smart pressure transmitter also called intelligent pressure transmitter.
The intelligent pressure transmitter consists of two parts: a smart sensor and a smart electronic board.
The smart sensor part includes: a capacitive sensor. A measuring diaphragm detection circuit. A temperature sensor, and a temperature compensation circuit.
The smart electronic board includes: a microcomputer controller. And the peripheral circuit, complete the pressure signal to 4 ~ 20mA dc conversion.
Smart Pressure Transmitter is used to measure the pressure of liquid, gas or steam. And then convert the pressure signal into 4 ～ 20mA DC signal output. The intelligent pressure transmitter produced by Sino-Inst can communicate with the HART communicator. It is widely used in weakly corrosive liquids in industrial pipelines, Gas and steam measurement and control systems.
Extended reading: How to calibrate HART pressure transmitters

What is the principle of pressure transmitter?

Like other transmitters, a pressure transmitter consists of electronics connected to a sensor. We can find transmitters with many types of pressure sensors on the market – capacitive, piezoelectric, resonant silicon, and more.
So pressure applied to capacitive cells will produce a change in the capacitance of the sensor. This change will affect the oscillator frequency, and the pressure transmitter will detect this change. Then the transmitter translates this data into a standard output signal that we can read.
Using a local setup or a handheld, you can adjust the transmitter, changing information like the unit, measuring range, and output.
More: How does a pressure transmitter work

How do you calibrate a smart transmitter?

To perform the test:
1. Isolate the transmitter from the process being measure and its loop wiring. If measuring the mA signal across the transmitter test diode leave the wires intact, but note this method does not give the best mA measurement accuracy.
2. Connect the mA measurement jacks of the 754 to the transmitter.
3. Connect the pressure module cable to the 754 and connect the transmitter test hose from the hand pump to the transmitter.
4. Press the HART button on the calibrator to see the configuration of the transmitter.
5. Press HART again and the calibrator will offer the correct measure/source combination for the test. If documenting the calibration press As-Found, input the test tolerance and follow the prompts. If the measured mA signal at the test points is found within tolerance the test is complete. If not, adjustment is required.
6. Select, adjust, and trim the pressure zero, mA output signal and input sensor.
7. After adjustment select As-Left, document the condition of the transmitter and after adjustment and if the test passes, it is complete.
More: Pressure Transmitter Calibration

How do you calibrate a pressure transmitter with HART Communicator PDF?

The basic procedure for calibration
1. Isolate the Pressure Transmitter from the Process.
2. Slowly open the vent plug and the vent valve to release the pressure.
3. Connect the multimeter with the transmitter and ensure that output is 4ma when 0 pressures are applied.
4. Connect the handheld test pump (pressure source) to the transmitter.
5. Ensure there is no leak.
6. Apply pressure range at 0%, 25%, 50%, 75%, 100% and check there is any error.
7. If there is any error calibration should be done.
Extended reading: Smart Differential Pressure Transmitter

KimGuo11

drurylandetheatre.com

Differential Pressure Flow Meters

Posted on July 25, 2019 by KimGuo11

Differential Pressure (DP) Flow Meters Technology –
Reliable Flow Solutions Across Many Applications

Differential Pressure Flow meters, also known as DP flow meters. Differential Pressure (DP) flow meters introduce a constriction in the pipe, that creates a pressure drop across the flow meter.

The calculation of fluid flow rate, by reading the pressure loss across a pipe restriction, is the most used flow measurement technique in industrial applications.

Differential pressure flow meters are suitable for water flow measurement, oil, steam or gas flow measurement.

According to different flow senor structures, we have:

Orifice Plate Flowmeters;
Venturi Flowmeters;
Nozzle Flowmeters;
Wedge Flowmeters;
Annubar Flowmeter

And more.

RFQ NOW

What is a differential pressure flow meter?

You can take this as the definition of the differential pressure flow meter.

Differential pressure flow meters, also known as DP flowmeters, create a cross-sectional change in the flow tube, which causes the velocity of the flowing fluid to change.

A change in velocity occurs whenever there is a change in flow cross-section; ie, With a decrease in velocity, an increase in pressure occurs.

Differential pressure flow meters can be used as liquid flowmeters or gas flowmeters; however, a single flow meter may not be configured to measure both liquid and gas phases.

Differential pressure (also known as throttling) Flow meters, are based on the throttling principle of fluid flow. It is one of the most mature and most commonly used methods for measuring flow in production. It is usually composed of a throttling device, which capable of converting the measured flow into a differential pressure signal, and a differential pressure gauge, and a display instrument, capable of converting the differential pressure into a corresponding flow value.

In the unit combination meter, the differential pressure signal generated by the throttling device, is often converted to a corresponding standard signal (electrical or pneumatic), by a differential pressure transmitter for display, recording or control.

The differential pressure flow meter is composed of a primary device (detection member), and a secondary device (a differential pressure converter and a flow display instrument).

Types of flow meter

The differential pressure flow meter is usually classified in the form of a test piece, such as an orifice flowmeter, a venturi flowmeter, a constant velocity tube flowmeter, a pitot tube principle-Pitoba flowmeter, and so on.

The secondary device is a variety of mechanical, electronic, electromechanical integrated differential pressure gauges, differential pressure transmitters and flows display instruments.

It has developed into a large-scale instrument with a high degree of categorization (series, generalization, and standardization) and a wide variety of specifications.

It can measure flow parameters as well as other parameters (such as pressure, level, density, etc.).

How does a differential pressure flow meter work?

Differential pressure flow meters use Bernoulli’s equation, to measure the flow of fluid in a pipe.

Differential pressure flow meters introduce a constriction in the pipe, that creates a pressure drop across the flowmeter.

When the flow increases, more pressure drop is created. Impulse piping routes the upstream and downstream pressures of the flowmeter to the transmitter, that measures the differential pressure to determine the fluid flow.

This technology accounts for about 21% of the world market for flow meters.

Bernoulli’s equation states that the pressure drop across the constriction is proportional to the square of the flow rate. Using this relationship, 10 percent of full-scale flow produces only 1 percent of the full-scale differential pressure.

At 10 percent of full-scale flow, the differential pressure flowmeter accuracy is dependent upon the transmitter, being accurate over a 100:1 range of differential pressure.

Differential pressure transmitter accuracy is typically degraded, at low differential pressures in its range, so flowmeter accuracy can be similarly degraded.

Therefore, this non-linear relationship can have a detrimental effect on the accuracy, and turn down of differential pressure flow meters.

Remember that of interest is the accuracy of the flow measurement system — not the accuracy of the differential pressure transmitter.

Different geometries are used for different measurements, including the orifice plate, flow nozzle, laminar flow element, low-loss flow tube, segmental wedge, V-cone, and Venturi tube.

Differential pressure flow meter formula:

where

points 1 and 2 lie on a streamline,
the fluid has constant density,
the flow is steady,
and there is no friction.

Although these restrictions sound severe, the Bernoulli equation is very useful, partly because it is very simple to use. And partly because it can give great insight into the balance between pressure, velocity, and elevation.

To learn more about DP Flow:

Extended reading: Smart Differential Pressure Transmitter

Advantages and disadvantages of differential pressure flow meter

The upside of this technology is low cost, multiple versions can be optimized for different fluids and goals, are approved for custody transfer (though it is being used less and less for this). It is a well-understood way to measure flow. And it can be paired up with temperature/pressure sensors, to provide mass flow for steam and other gasses.

Negatives are that rangeability is not good due to a non-linear differential pressure signal (laminar flow elements excepted), accuracy is not the best and can deteriorate with wear and clogging.

Advantages and disadvantages of throttling differential pressure flow meter (orifice flowmeter)

Advantages:

1) The standard orifice plate structure of the throttle piece is easy to copy, simple, firm, stable and reliable in performance, long in service life and low in price;

2) The throttling application range is extremely wide. All single-phase fluids, including liquid, gas, and steam, can be measured. Some mixed-phase flows, such as gas-solid, gas-liquid, liquid-solid, etc. can also be applied. General production processes and pipe diameters, The working condition (pressure, temperature) has products;

3) All accessories can be used by all manufacturers if it is an international standard and can be used without calibration.

Disadvantages:

1) The repeatability and accuracy of the measurement are medium levels;

2) The range is narrow because the meter signal and the flow rate are squared, the general range can only reach 3:1 ~ 5:1;

3) The requirements for on-site installation conditions are relatively high. If a long straight pipe section is required, it is difficult to meet;

4) The pressure piping is a weak link, which is prone to leakage, blockage, freezing and signal distortion;

5) The pressure loss is large.

Extended reading: Integral DP Flow Meter|Gas, liquid, steam|Compact structure

What is the relationship between flow and differential pressure?

Differential pressure use Bernoulli’s equation to measure the flow of fluid in a pipe.

Differential pressure flow meters introduce a constriction in the pipe, that creates a pressure drop across the flowmeter.

When the flow increases, more pressure drop is created.

y+P(x)y =Q(x)y^n (equation)

is called a Bernoulli differential equation where n is any real number.

The graph below shows the resulting pressure drop for water at 60 F, over a range of flow rates for a 100-foot long pipe, for both 4 inches and 6-inch schedule 40 piping.

the relationship between flow and differential pressure

If you need, you can learn more about Flow Rate And Pressure Relationship.

How to Select a Flow Meter?

The basis of good flow meter selection is a clear understanding of the requirements of the particular application.

Therefore, time should be invested in fully evaluating the nature of the process fluid and of the overall installation.

What is the fluid being measured by the flow meter(s) (air, water, etc…)?
Do you require rate measurement and/or totalization from the flow meter?
If the liquid is not water, what viscosity is the liquid?
Is the fluid clean?
Do you require a local display on the flow meter or do you need an electronic signal output?
What are the minimum and maximum flow rate for the flow meter?
What are the minimum and maximum process pressure?
What are the minimum and maximum process temperature?
Is the fluid chemically compatible with the flow meter wetted parts?
If this is a process application, what is the size of the pipe?

Types of Differential Pressure Flowmeters

Flat metal plate with an opening in the plate installed perpendicular to the flowing stream in a circular pipe.

As the flowing fluid passes through the orifice, the restriction causes an increase in velocity and a decrease in pressure.

A differential pressure transmitter is used to measure pressure between the orifice and the pipe flow stream.

There is always a permanent pressure loss. No dirty liquids allowed.

Orifice differential pressure flowmeters can be constructed to measure gas, liquid or steam.

Orifice plates are primary flow elements which measure flow as a function of differential pressure.

A restriction with a relatively long passage having a smooth entry and exit.

A venturi produces less permanent pressure loss than an orifice but is more expensive.

They are often used in dirty streams because there is no build-up of the foreign material.

Venturi flow meters can be constructed to be either gas flowmeters or liquid flow meters.

Extended reading: What Is A Venturi Flow Meter?

Smooth entry and sharp exit. Permanent pressure loss is on the same level as an orifice, with the added ability to handle dirty and abrasive fluids.

A differential pressure transmitter is used to measure pressure between the nozzle and the pipe flow stream.

This type of differential pressure flowmeter technology can be constructed to measure either gas or liquids.

Extended reading: What is a flow nozzle?

A device consisting of a Pitot tube and an annubar tube combined with static pressure ports.

The differential pressure between the two ports is the velocity head.

A differential pressure transmitter is used to measure pressure differential between the two ports.

This indication of velocity combined with the cross-sectional area of the pipe provides an indication of flow rate.

Pitot tube flow meters can measure either liquids or gases.

Differential pressure is caused by centrifugal force between the inside diameter and the outside walls of the pipe elbow.

It does not introduce any additional pressure loss other than that caused by the elbow.

A differential pressure transmitter is used to measure pressure between the walls.

This type of flow meter technology can be configured as either a gas or a liquid flow meter.

A wedge-shaped element that is perpendicular to the flow at the top of the conduit which means that the bottom part is unrestricted.

Therefore, it is useful in slurry measurement.

A differential pressure transmitter is used to measure pressure between either side of the wedge.

However, this type of differential pressure flow meter technology can be constructed to work as either a gas or a liquid flow meter.

Consists of a V-shaped cone element placed at the center of the pipe which creates an annular space for the passage of fluid.

It has a lower permanent pressure loss than orifice flowmeter.

The cone element conditions the flow at the same time it is creating the pressure differential, providing for smoother and less noisy differential pressure readings vs. the orifice technology.

A differential pressure transmitter is used to measure pressure before and after the cone.

This type of differential pressure flow meter can be constructed to measure gases, liquids, or steam.

This type of flow meter relates a change in flow rate to the differential pressure across a spring-loaded cone.

The cone repositions itself to balance the force.

This, in turn, changes the aperture for the flow.

Flow rate has a relationship with the differential pressure of the flow meter and the position of the spring-loaded cone.

A differential pressure transmitter is used to indicate flow.

This type of differential pressure flow meter technology can be constructed to measure either gas or liquids.

Flow rate is linearly proportional to the differential pressure and inversely proportional to the viscosity of the flowing fluid.

A flow can be made laminar by passing through a bundle of small diameter tubes.

A differential pressure transmitter is used to measure pressure before and after the tubes.

This type of differential pressure flow meter technology can be constructed to measure either gas or liquids.

Featured DP Flow Meters for Sale

Water Pressure Transducers

Posted on July 24, 2019 by KimGuo11

Pressure Transducers and Water Pipe Pressure Measurement

Water pressure transducers also called a water pressure sensor,
are pressure transmitters that can measure water pipe pressure.

For the water level/water depth measurement,
in the tank, or in the well, we can use electrical transmitters, stainless steel body, IP65-IP6, 4-20ma output.

Sino-Inst applies application expertise to design and manufacture pressure sensors and transducers for the water industry.

Various factors impact the selection and long term use of water pressure sensors and transducers, in residential, commercial, and irrigation systems.

Sino manufactures various products with design features, to offer excellent accuracy and long term stability.

Below is some basic information to review, before making a decision on the type of pressure sensor technology, as well as the electrical and mechanical features required.

Sino-Inst also offers pressure transmitters with 0-5V/0.5-4.5V, just contact us now.

Water Compatibility

A pressure sensing element will come in contact with varying pH levels, depending on the type of water, chemicals added, and the quality of the water purification process.

Sino packages pressure sensors using silicon strain gages, mounted onto a one-piece, 316L stainless steel sensing element.

316L SS offers excellent media compatibility for residential, and commercial water applications and is an NSF61 compliant material.

Environment

Rain, ice, dust, and pressure washers can cause water to seep into sensor housings, and cause the electronics to short.

Sino offers sealed gauge reference pressure sensors to protect the electronics from these conditions.

Electrical Isolation

Improper grounding and lightning strikes can cause electrical failures of pressure sensors, as a result of isolation failure.

Sino can include custom electronics and a sensing element to withstand 500VDC isolation to work in extreme electrical conditions.

The use of a 4-20mA output signal for transmission lengths greater than 15 feet in environments with electrical noise, will help prevent signal loss or noisy signal conditions.

Read more about: What is a pressure sensor and how it works?

Using Pressure Transducers for Water Pipe Pressure Measurement at Water Distribution Utilities

Inlet and Outlet Water Pipe Pressure Measurement in Clean Water Systems

Clean water systems use lift stations and gravity feed reservoirs, to pump water between locations.

In some residential settings, lift stations and water towers alone cannot supply enough pressure, to provide users at higher elevations with clean water.

Also, water reservoirs and water towers, that experience sudden, large draws of water need replenishment.

Pressure-controlled variable frequency drive pumps (VFDs) are used with pressure transducers, for reliable electronic pressure measurement to determine when extra pressure and flow are required by users.

Pressure transducers are used to monitor water pressure, at elevation, in reservoirs, and the rate of change in each.

VFD pumps interpret the pressure inputs and output the necessary increase or decrease in pump output pressure and flow rate.

Of course, in the water supply or wastewater treatment industry, the measurement of water flow is also very important. For example, if you need to measure the flow of wastewater in a 2-inch pipe. Then you can refer to Magnetic Flow Meters Guides.

Electronic Pressure Transducer Applications for Water Pipe Pressure Measurement in Clean Water Systems

Pressure transducers are used for inlet and outlet water pipe pressure measurement, in clean water systems at public utilities.

An electronic pressure transducer is typically used in water distribution applications such as:

Pump intake pressure measurement
Pump output pressure measurement
End location (reservoir, elevated piping, etc.) pressure measurement

An important part of pressure transmitter selection is ensuring that any electronic pressure transducer used is compatible with potable water.

Pressure transducers are responsible for monitoring the pressure, at various locations throughout clean water systems and often interface with VFD pumps to show, when increased pressure or flow rates are necessary.

The SI-200 and SI-390 electronic pressure transducers are designed for long lifetimes, in both inlet and outlet pipes of clean water systems.

They can usually be delivered within days in a wide variety of configurations.

In addition to measuring water pressure, you may also need to measure water depth. We also provide Portable Ultrasonic Water Depth Gauge.

How to select a water pressure transducer for water pressure?

Absolute or gauge pressure measurement
Cable or flying lead pressure transmitter wiring
Media compatibility for pressure transmitters
Moisture resistance in pressure transmitters
Pressure transmitter accuracy and errors
Radiofrequency (RFI) and electromagnetic interference (EMI) in pressure transmitters
Standard or flush diaphragm pressure transmitters
Vibration resistance in pressure transmitters

Submersible water pressure sensor

Submersible pressure transducer with 4-20mA output is Hydrostatic Level Sensor for level measurement. Submersible pressure transducer is based on the measured liquid static pressure proportional to the height of the liquid Principle. Convert static pressure into electrical signal. After temperature compensation and linear correction. Convert into standard electrical signal. Generally 4 ～ 20mA / 1 ～ 5VDC. It can also be called “static pressure liquid level gauge, liquid level transmission Device, liquid level sensor, water level sensor “. Bullet, cage, and flush tip models are available. Applications include pumps, downhole, oil tanks, lime slurry, and water tanks. There is a miniature submersible transmitter that is low power voltage.

Extended reading: What is a pressure sensor?

Liquid pressure sensor for water pipe

**SI-151 Hydrostatic Level Sensor**
Hydrostatic Level Sensor (Best Price), also called Hydrostatic level transmitter. Continuous level measurement in liquid applications with pressure sensors.

**SMT3151TR Submersible Level Transmitter**
Hydrostatic level transmitter is also called hydrostatic level gauge. The rod-type Hydrostatic level transmitter 4-20mADC standard signal output. Flange or threaded installation. Can withstand high temperatures up to 450 ℃.

**SI-PCM260 Deep Well Water Level Sensor**
Well water level sensor is to apply Hydrostatic Level Sensor to deep well. Well water level sensor submerged in deep well work together with submersible water pump. Range 300m ～ 1000m.

**SI-302 Anti-corrosive Submersible Level Transmitter**
Submersible Level Transmitter is made of Anti-corrosive all-tetrafluoroethylene(PTFE) material. It has high temperature resistance, corrosion resistance and anti-clogging.

**Extended Diaphragm Seal DP Level Transmitter** Extended Diaphragm Seal DP Transmitter is a level transmitter direct mounted on pipe or tank. The isolation diaphragm is in direct contact with the liquid medium.

**Remote Seal Differential Pressure Transmitter** Remote seal differential pressure transmitter is used to prevent medium from entering transmitter. The pressure sensitive diaphragm and the transmitter are connected by a capillary filled with fluid. It is used to measure the level, flow and pressure of fluids, gases or steam.

**Differential pressure(DP) level transmitter** Differential pressure (DP) level transmitter is a perfect solution for tank level measurement. Flanges, seal diaphragms, capillaries, and DP transmitter are often used to measure liquid levels.

What are the different types of pressure sensors?

There 4 main types of pressure sensors based on this:

Strain Gauge Pressure Transducers
Capacitance Pressure Transducers
Potentiometric Pressure Transducers
Resonant Wire Pressure Transducers

More about Industrial Pressure Sensors

FAQ

How does a pressure transducer work?

The installation of the pressure transducer measurement system,
consists of three parts, namely the laying of the pressure guiding tube,
the laying of the electrical signal cable and the installation of the differential pressure transmitter.
During the operation of the pressure transmitter, the pressure of the medium is transmitted to the central measuring diaphragm.
Through the isolating diaphragm and the silicone oil, and the pressure difference from the double-sided pressure guiding tube is received on the double-sided isolating diaphragm, where the membrane is measured.
The sheet functions as a resilient element and is deformed by the pressure difference.
There is a positive proportional relationship, between the displacement of the measuring diaphragm and the differential pressure.
And under the influence of the displacement of the diaphragm, the capacitance of the differential capacitor also changes.
And the measuring circuit converts it into a DC current signal of 4-20 mA.
Extended reading: Hydrostatic Pressure Transmitter

Where are pressure transducers used?

Pressure transducers are mainly used in the following areas:
Petroleum, petrochemical, chemical. Matching with throttling devices to provide accurate flow measurement and control. Measures pressure and level in pipes and tanks.
Electricity, city gas. And other companies and businesses require high stability and high precision measurement and other places.
Pulp and papermaking are used in places that require chemical-resistant liquids and corrosion-resistant liquids.
Steel, non-ferrous metals, and ceramics are used in furnace pressure measurement and other places that require high stability and high precision measurement. They are also used in places that require stable measurement under strict control (temperature, humidity, etc.).
Machinery and shipbuilding, used to strictly control the place where high precision is required for stable measurement.
Extended Reading: 4 wire pressure sensor wiring diagram

What is pressure sensor and how it works?

A pressure sensor is a device or device that can sense a pressure signal and convert the pressure signal into a usable output electrical signal according to a certain rule.
A pressure sensor usually consists of a pressure-sensitive element and a signal processing unit. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors. A pressure sensor is the core part of pressure transmitter. More.
Extended Reading: Wireless Water Meter

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KimGuo11

drurylandetheatre.com

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Used as a reminder of impulse pipeline problems

For flame instability detection in refining furnaces

Q&A

What is smart pressure transmitter?

What is the principle of pressure transmitter?

How do you calibrate a smart transmitter?

How do you calibrate a pressure transmitter with HART Communicator PDF?

What is a differential pressure flow meter?

How does a differential pressure flow meter work?

Differential pressure flow meter formula:

Advantages and disadvantages of differential pressure flow meter

What is the relationship between flow and differential pressure?

How to Select a Flow Meter?

Types of Differential Pressure Flowmeters

Orifice Flowmeters:

Venturi Flowmeters:

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Frequently
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