Measuring Oilfield Wastewater with Electromagnetic Flowmeter

Posted on January 18, 2023 by KimGuo11

Oilfield wastewater, the water that is extracted from oil wells along with crude oil. Usually contains oil, salt, mechanical impurities, dissolved oxygen and saprophytic bacteria. Pollution to the oil field and the surrounding environment. After treatment, it can be reinjected back into the oil layer to be used as an oil displacement agent. Most of the time, electromagnetic flowmeters are used to measure oilfield wastewater.

RFQ Flowmeters

Measuring Oilfield Wastewater with Electromagnetic Flowmeter

Difficulties in Oilfield Wastewater Measurement

With the growth of oil demand and the improvement of oil extraction technology, the amount of oil extraction wastewater treatment is increasing day by day. Effective control of oil production wastewater pollution and the utilization of wastewater resources have become key issues facing oilfield development.

The first thing to do in wastewater treatment is to accurately measure the oil production wastewater. Only by accurately measuring the amount of wastewater can scientific and reasonable wastewater treatment and wastewater scheduling be carried out. After the wastewater is treated up to the standard, most of it will be used as mining injection water and re-injected into the formation.

Turbine flowmeters used in some early Oilfield Wastewater. The error between the instrument measurement data and the measurement tank data reaches more than 20%, which causes a great waste of on-site resources.

Oil production wastewater carries a large amount of suspended solids. The inner blades of the turbine flowmeter are easy to be jammed and damaged, and need to be dismantled and maintained regularly;
Turbine flowmeters used in different pipelines and process links are not universal. On-site instrument maintenance is difficult;
The flow rate of the 2-inch pipe is less than 70 cubic meters per day. The micro-flow turbine flowmeter cannot measure accurately;
The lower end of the coupling device is easy to accumulate impurities, which makes the measurement accuracy low. The tiny traffic of some sites cannot even be measured;
Oil production wastewater has a high temperature and contains different salts and other impurities. It is easy to corrode the turbine flowmeter.

Oilfield wastewater classification

Before sewage treatment, it is particularly important to determine its composition. The sewage on the oil field is divided into general sewage and drilling sewage:

General waste water

The main components are water, secondary clay minerals, mercaptan (RSH), sulfide (RSR), disulfide (RSSR) and other components condensed together by various substances.

For the composition of general sewage, because it contains more impurity particles, and the water is more acidic or alkaline. Therefore, the selected electromagnetic flowmeter can be measured with rubber or PTFE lining, and used with stainless steel electrodes.

Drilling sewage

The main components are drilling fluid, flushing fluid, etc. Its main pollutants include drilling cuttings, petroleum, viscosity control agents (such as clay), weighting agents, clay stabilizers, corrosion agents, preservatives, fungicides, lubricants, formation affinity agents, defoamers, etc. Drilling sewage also contains heavy metals and so on.

Drilling sewage contains more chemical synthetic agents, complex components, strong acidity and alkalinity and corrosiveness. It also contains some heavy metal ions. In order to ensure good detection and stability of the flowmeter, it is usually necessary to choose a polyurethane or polyperfluorinated lining for measurement. At the same time, tantalum electrodes or Ha C electrodes are used.

Application of Electromagnetic Flowmeter in Oilfield Wastewater and Oilfield

The advantages and working principles of electromagnetic flowmeters have been mentioned in many pages. I won’t repeat it here.

Electromagnetic flowmeters play an important role in water irrigation, polymer injection and sewage metering in oil fields.

The use of electromagnetic flowmeters in the measurement of oilfield wastewater has the following advantages.

①The structure of the sensor is simple and reliable. The diameter is the same as that of the front and rear straight pipe sections. And there are no moving parts in the flow channel. There are no parts to block the flow of the measured liquid and save equipment. There will be no jamming or jamming;

② The measured medium flows through the measuring tube. There is almost no loss of pressure, which can significantly reduce the consumption of the driving force of the pump;

③ The output current and frequency of the electromagnetic flowmeter have a linear relationship with the measured flow. It is not affected by the measured medium (temperature, pressure, viscosity). Therefore, the electromagnetic flowmeter can be used to measure crude oil with sandy content or high water content only after being calibrated with water without modification;

④ Electromagnetic flowmeter has no mechanical inertia and quick response. Instantaneous pulsating flow can be measured. It is convenient for the monitoring of the production site.

Selection of Electromagnetic Flowmeter for Measuring Oilfield Wastewater

It is very important to choose the type of instrument including the magnetic flowmeter. Some failures of instruments in practical applications are caused by wrong selection or improper use. Therefore, after selecting an electromagnetic flowmeter, the following factors should be considered:

Aperture Selection

According to the process pipe diameter, pipe pressure and sewage flow provided by the sewage treatment plant. Choose an electromagnetic flowmeter with an appropriate diameter, and there is no need for pipe shrinkage and expansion at the installation site.

Selection of Liner and Electrode Materials

Electromagnetic flowmeters are mainly used to measure fluid flow with a conductivity greater than or equal to 5 pressure S/cm. Different lining and electrode materials should be selected according to the corrosiveness, wear, temperature and condensation characteristics of the tested material and its bearing capacity.

Select the protection level

According to national standards, the sensor has two levels of protection: IP65 water jet type and IP68 submersible type. According to the actual installation position of the user in the low well, the sensor adopts IP68 dustproof submersible type.

Select other functions

(1) For the selected basic type, the electromagnetic flowmeter has LCD display, 4-20ma current output and 0-1khz frequency output. The function of the Rs-485 communication port should be added according to the communication requirements of the flowmeter and the computer.

(2) For sensors installed underground, split type should be selected.

Featured Magnetic Flow Meters

Small Pressure Transducer/Sensor-Low Cost-High Performance

Posted on January 16, 2023 by KimGuo11

The Small Pressure Transducer/Sensor is characterized by its small size, the shortest can be 5CM. In some occasions where the installation location is small, it has an irreplaceable volume advantage.
Small Pressure Transducer is that the pressure of the measured medium acts directly on the diaphragm of the sensor (stainless steel or ceramics). Make the diaphragm produce a micro-displacement proportional to the medium pressure. The resistance value of the sensor is changed, and the change is detected by the electronic circuit. And convert and output a standard measurement signal corresponding to this pressure.
The interface, casing and electrical interface of the transmitter can be adapted according to the requirements of the user’s industry.

RFQ Pressure Transmitters

Featured Small Pressure Transducers/Sensors for Sale

**SI-350 Sanitary Pressure Transmitter**

**SI-300 Pressure Transducer 4-20mA/Voltage**

**SI-703 Flush diaphragm pressure sensor**

**SI-51 Miniature Pressure Sensor/Transducer**

**High Frequency Dynamic Pressure Sensor**

**SI-706 Combined Pressure and Temperature Sensor-Dual function**

**SI-512H High Temperature Pressure Sensor**

How small can a pressure sensor be?

The Small Pressure Transducer/Sensor is characterized by its small size, the shortest can be 5CM. The interface, casing and electrical interface of the transmitter can be adapted according to the requirements of the user’s industry. The size of Small Pressure Transducer/Sensor also supports customization.

For example, the following product dimensions:

Miniature Pressure Sensor/Transducer

Miniature Pressure Sensor is also called Miniature Pressure Transducer. The miniature pressure sensor is a miniature solid-state silicon force sensor integrated with MEMS technology. One-piece miniature stainless steel package. Make it have excellent dynamic performance. Small size, streamlined, strong, compact shape structure.

Product size Φ3, Φ5, M6, M8, M10. Can be specially designed according to specific working conditions;
Small size, streamlined appearance;
split structure. Optional standard voltage, current, digital signal output. Meet the requirements of various working conditions;
High dynamic frequency response, steep rising edge;
Wide measuring range. Any range between -100Kpa~0-10KPa…60MPa;

Frequently
Asked
Questions

Help Center

Low-pressure pressure transmitter is the application of conventional pressure sensor technology extended to the field of ultra-low pressure. While maintaining the original high performance, the pressure range can be as low as 0-5KPa. The advanced design makes this ultra-low pressure transmitter have the characteristics of fast response and good long-term stability.

The pressure transducer is used to measure various pressures.

The basic structure of its measurement part can be regarded as a space divided into two parts by the sensor. Including the case where one space is the entire universe.

When the pressures of these two parts are not equal, the force acting on the sensor causes the sensor to generate displacement or displacement tendency (force), and the pressure can be measured by detecting the displacement or displacement tendency.

Common sensors include diaphragms, spring tubes, and bellows, among which diaphragms are most widely used in transmitters.

Note that the pressure transmitter needs to be calibrated after a period of use. In order to ensure the accuracy of the quantity.

There are many types of pressure sensors. Such as resistance strain gauge pressure sensors, semiconductor strain gauge pressure sensors, piezoresistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, resonant pressure sensors, etc.

Extended reading: wireless pressure transmitter working principle

Currently, the most widely used pressure sensors include:

Diffused silicon piezoresistive pressure sensor,
Ceramic piezoresistive pressure sensor,
Sputtering thin film pressure sensor,
Capacitive pressure sensor,
Sapphire pressure sensor with high temperature resistance.
But the most widely used is the piezoresistive pressure sensor, which has a very low price, high accuracy and good linearity.

Extended Reading: Electronic Pressure Switch for Air Compressor

What’s the Difference Between a Pressure Transducer and a Pressure Switch? Simply put, the Pressure Transducer is a signal conversion and transmission device, and the pressure switch is a control switch device. This is the difference between a Pressure Transducer and a Pressure Switch. Let’s look at their differences in detail. And learn how to choose a pressure transmitter and pressure switch.

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

What’s the Difference Between a Pressure Transducer and a Pressure Switch?

Posted on January 15, 2023 by KimGuo11

RFQ Pressure Transmitters

Difference Between a Pressure Transducer and a Pressure Switch

The Pressure Transducer uses the output as a standard signal, and is composed of a pressure-sensitive element and a conversion circuit. Using the pressure of the measured medium to produce a small change of current or voltage output on the pressure sensitive element.

The transmitter 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 by the measurement and control system. Make industrial automation equipment and engineering operation control more intelligent.

The pressure switch is a simple control device. When the measured pressure reaches the set value, it will automatically send out an alarm or control the function of turning on or off.

The pressure switch needs to be opened or closed under the set pressure. It can be used for simple control, and the output is the switch value.

The output of the pressure transmitter can be an analog signal or a digital signal. The post-processing is convenient, and it can also be converted into a standard transmitter signal for remote transmission.

Extended reading: NB-IoT Wireless Pressure Transmitter Networking Solution

If you want to know more about pressure sensors, you can consult Sino-Inst, thank you!

What is Pressure Switch?

A pressure switch is a mechanical switch that is activated by pressure to a set point. The switch is used to control a circuit by turning it on and off. Here the pressure point at which the switch is triggered is called the set point. The pressure threshold at which the switch is disabled is called the cut-off point. With enough force, the contacts can open or close the switch depending on their configuration.

This is a device that activates an electrical contact when a fixed fluid pressure is reached. Typically, this switch has two functions. The main function is to maintain the pressure or reservoir level of the system. The secondary function is to prevent equipment from operating at a lower efficiency or from being harmed. Its notation is as follows:

Structure of the pressure switch

The structure of the pressure switch mainly includes five parts. These are diaphragm, adjustment spring, lever, electrical contacts and terminals.

The diaphragm in this switch acts like a sensing element and is therefore used to detect pressure. This element is usually made of a pressure-sensitive, flexible material.

Adjusting the spring will change the set point or cut point, some switches have separate springs that control the set point and cut point.

The AUTO/OFF lever is used to manually activate or deactivate the switch, this lever is very helpful to turn off the switch throughout the installation or maintenance process. Sometimes, a knob is used instead of a lever, but the principle works the same.

The electrical contacts allow current to flow through them once they are contacted by an external power source.
The terminals of the switch are used to connect an external power source to the contacts.

A pressure switch works by operating an electrical contact once a fixed fluid pressure is reached. The switch will make electrical contact when the pressure increases or the pressure decreases from a fixed preset pressure level.

Type of pressure switch

There are two types of pressure switches on the market today, mechanical and electronic.

Mechanical pressure switches are the most widely used due to their lower cost and ease of use compared to electronic pressure switches. These switches can be equipped with a mechanical pressure sensing element that deforms in response to fluid pressure. The different types of mechanical pressure switches are discussed below.

Piston pressure switch
This type of switch is the most popular and is widely used in different applications. Once the pressure of the fluid changes, it moves the piston axially, which triggers the switch. The switch can directly or indirectly detect the pressure of the liquid. Therefore, direct inspection mainly involves seals like O-rings. to prevent liquids from entering the components. Whereas indirect detection mainly involves a flexible diaphragm that separates the piston from the fluid.
Diaphragm pressure switch
This is a high quality switch primarily developed for safety critical applications. The main benefit of diaphragm pressure switches is that no voltage supply is required for the switching process. The switch consists of a metal membrane that is directly connected to the soaker portion of the switch and the diaphragm that activates the switch. The switch is used for monitoring process pressure and control in different industries such as chemical, petrochemical, natural gas, oil etc.
Bourdon tube pressure switch
This is an elastomer or flexible metal tube that attaches to one end of the switch while leaving the other end free to move. Once the pressure of the liquid in the tube rises, it tends to level, and this movement is then used primarily to activate the switch. These switches are suitable for different applications such as chemical, general power stations and petrochemical as long as the operating force is medium to high.
Differential pressure switch
This switch is useful when evaluating the force between two points within a system simply connected to two process ports on the upper or lower part of the device. If the pressure difference between the two sides increases by a certain threshold, the switch can be triggered. These switches are suitable for monitoring pressure drops in screens, filters and tank levels.
Electronic pressure switch.
It can be used with pressure sensors such as strain gauges. These types of switches have analog capabilities, so they are not limited to an on or off position. Continuous and variable signals can also be transmitted for more precise monitoring. Therefore, these are not only switches, but also measuring instruments or transmitters. Some additional features of these electronic switches are field programmability of switching functions, time delays, hysteresis, set points, etc.

**Stainless Steel Pressure Switch PC-300**

What is Pressure Transducer?

A pressure transducer is a device that converts pressure into a pneumatic signal or an electric signal for control and remote transmission.

It can convert the physical pressure parameters such as gas and liquid felt by the load cell sensor into a standard electrical signal (such as 4~20mADC, etc.). It can be used to supply secondary instruments such as indicating alarms, recorders, and regulators for measurement and indication, and process regulation.

Working Principle of Pressure Transducer

Pressure Transducer Electrical components that feel pressure are generally resistance strain gauges. The resistance strain gauge is a sensitive device that converts the pressure on the device under test into an electrical signal. The most widely used strain gauges are metal resistance strain gauges and semiconductor strain gauges.

There are two types of metal resistance strain gauges: wire strain gauges and metal foil strain gauges. Usually, the strain gauges are tightly bonded to the mechanical strain-generating substrate through a special adhesive. When the stress of the substrate changes, the resistance strain gauge also deforms together. Change the resistance value of the strain gauge, so that the voltage applied to the resistance changes.

Types of Pressure Transducers

The types of pressure transmitters are roughly as follows: resistance strain gauge pressure transmitters, semiconductor strain gauge pressure transmitters, piezoresistive pressure transmitters, inductive pressure transmitters, capacitive pressure transmitters, Resonant pressure transmitter and capacitive acceleration sensor, etc.

Piezoresistive pressure transmitter

The resistance strain gauge is a sensitive device that converts the strain change on the tested object into an electrical signal. It is one of the main components of piezoresistive strain transmitters. There are two kinds of resistance strain gauges, metal resistance strain gauges and semiconductor strain gauges.

Usually, the strain gauges are tightly bonded to the substrate that generates mechanical strain through a special adhesive. When the stress of the substrate changes, the resistance strain gauge also deforms together. Change the resistance of the strain gauge. This changes the voltage across the resistor.

Ceramic pressure transmitter

Principle Corrosion-resistant pressure transmitters have no liquid transfer, and the pressure acts directly on the front surface of the ceramic diaphragm. To make the diaphragm slightly deformed, thick film resistors are printed on the back of the ceramic diaphragm and connected to form a Wheatstone bridge.

Due to the piezoresistive effect of the varistor, the bridge produces a highly linear voltage signal proportional to the pressure and proportional to the excitation voltage. The standard signal is calibrated as 2.0 / 3.0 / 3.3 mV/V according to different pressure ranges. Compatible with strain gauge sensors.

Through laser calibration, the sensor has high temperature stability and time stability. The sensor comes with a temperature compensation of 0-70°C, and can be in direct contact with most media. ,

Diffused silicon pressure transmitter

The pressure of the measured medium acts directly on the diaphragm of the sensor, causing the diaphragm to produce a micro-displacement proportional to the pressure of the medium. The resistance value of the sensor is changed, and the change is detected by the electronic circuit. And convert and output a standard measurement signal corresponding to this pressure.

Piezoelectric Pressure Transmitters

The piezoelectric materials mainly used in piezoelectric sensors include quartz, potassium sodium tartrate, and ammonium dihydrogen phosphate. Among them, quartz is a natural crystal in which the piezoelectric effect is found. Within a certain temperature range, the piezoelectric properties always exist, but when the temperature exceeds this range, the piezoelectric properties disappear.

Capacitive pressure transmitter

Ceramic capacitive sensors are available for measurements in normal or aggressive media. Materials such as gas, gas or liquid, but not prone to precipitation, crystallization or stiffening are recommended. Applied to tank liquid level measurement, sea water, water on board, diesel oil, waste oil.

**Diffused silicon Gauge Pressure Transmitter**

**Capacitive Gauge Pressure Transmitter**

**Explosion-proof Pressure Transmitter**

Selection of pressure switch and pressure transmitter

Both pressure switches and pressure transmitters are intelligent digital display pressure measurement products integrating pressure measurement, display, output and control. When choosing, you only need to remember the following 6 points to know what kind of pressure switch and pressure transmitter to use.

According to the characteristics of pressure switch and pressure transmitter, you can start from the following data that need to be measured:

The measured medium and the actual condition of the medium
The measured pressure range
Required measuring range
The temperature of the working conditions on site
The connection method used in conjunction with the working conditions
Installation location

According to the above 6 points of data and requirements, you can know what kind of pressure switch or pressure transmitter is needed. In addition, pressure switches and pressure transmitters are all non-standard customized products. It can be used according to the site Working conditions to decide.

SI-51 Miniature Pressure Sensor/Transducer

Posted on January 13, 2023 by KimGuo11

RFQ Pressure Sensors

Features of Miniature Pressure Sensor

Product size Φ3, Φ5, M6, M8, M10. Can be specially designed according to specific working conditions;
Small size, streamlined appearance;
split structure. Optional standard voltage, current, digital signal output. Meet the requirements of various working conditions;
High dynamic frequency response, steep rising edge;
Wide measuring range. Any range between -100Kpa~0-10KPa…60MPa;

Specifications of SI-51 Miniature Pressure Sensor

Measuring range	-100KPa-0-10KPa…1MPa…60MPa
Measuring medium	Gases or liquids compatible with 316 stainless steel
Static accuracy	±0.1%FS ±0.25%FS ±0.5%FS
Dimensions	Φ3、Φ5、M6、M8、M10 (customizable)
Natural frequency	10KHz~1MHz
Product structure	Transmitter: split type
Signal output/power supply	4-20mA 0-5V 0-10V 1-5V	12-36VDC (Typical 24VDC)
	mV signal	Constant voltage source/constant current source
	Digital signal output RS485	5VDC/5-16VDC/24VDC
Operating temperature	-40～85℃
Compensation temperature	-10～60℃
Storage temperature	-40～100℃
Long term stability	Typical: ±0.1%FS/year Maximum: ±0.2%FS/year
Zero temperature drift	Typical: ±0.02%FS/℃ Maximum: ±0.05%FS/℃
Sensitivity temperature drift	Typical: ±0.02%FS/℃ Maximum: ±0.05%FS/℃
Overload capability	2 times full scale pressure or maximum 110MPa (take the minimum value)
Effective measurement life	﹥106 pressure cycles (P:10-90%FS)
Vibration resistance	20g （IEC 60068-2-6）
Impact resistance	20g，11mS
Resolution	Greater than 10-5 (usually limited acquisition and display equipment, theoretically infinitely small)
Load Resistance	≤(U-12)/0.02 Ω (current output) >100KΩ (voltage output)
Insulation resistance	200MΩ，100VDC
Electrical connections	Connector or direct cable 2m2m
Interface and housing material	304/316L stainless steel
Shell protection	IP65 (plug type) IP67 (cable type)
Explosion-proof	Ex iaⅡ CT5 (Intrinsically safe)
Seal ring	Fluorine Rubber
Sensor diaphragm	Stainless steel 316L
Product weight	The sensor is about 20-30 grams, and the transmitter is about 300 grams

Extended reading: NB-IoT Wireless Pressure Transmitter Networking Solution

Miniature Pressure Sensor/Transducer Applications

Water turbine and underwater weapon test
Fluid mechanics and hydraulic tests
Aircraft and Engine Tests
Aerodynamic studies
Biomedical Science
wind tunnel test
manufacturing
Equipment matching

More Featured Pressure Sensors & Transducers

**SI-390 Industrial Pressure Transmitter**

How to Calibrate a Flow Meter？Calibration Flow Meters

Posted on January 11, 2023 by KimGuo11

A flow meter is an instrument used to measure and indicate the volume or mass of a gas or liquid. Simply put, it is an instrument used to measure the flow of fluid in pipes or open channels. Also known as flow indicator, liquid flow meter, flow sensor, etc.

Flowmeters are further divided into differential pressure flowmeters, rotameters, throttling flowmeters, slit flowmeters, volumetric flowmeters, electromagnetic flowmeters, ultrasonic flowmeters, etc. According to the medium, it can be divided into: liquid flowmeter and gas flowmeter.

RFQ Flowmeters

What is Flow Meter Calibration?

Flow meter calibration is carried out according to the verification regulations of various flow meters promulgated by the National Metrology Bureau.

For the flowmeters used, except for the standard throttling device, no experimental verification is required. The rest of the flowmeters are almost all verified when they leave the factory. During the use of the flowmeter, it should also be calibrated frequently.

The calibration methods of liquid flowmeter mainly include volumetric method, mass method, standard volume tube method and standard flowmeter comparison method.

The calibration methods of gas flowmeter mainly include sonic nozzle method, servo standard flowmeter comparison method and bell jar method.

Why is it important to calibrate a flow meter?

Most people recognize that a flow meter should be calibrated before it is put into service, but why is flow meter calibration so important?

The flow meter calibration process involves comparing the flow meter to a reference device used as a calibration standard. Calibration of reference equipment should be traceable to national or international standards. The next step involves adjusting the flow meter (if necessary) to counteract any errors.

If, like thousands of other facilities, flow meters are used in your process, it makes good business sense to ensure that the flow meters you use are giving you accurate and consistent information.

No matter what fluid you are metering, the liquid, gas or steam used in the process is most likely a valuable commodity. Accurate flow meter performance is therefore an invaluable part of business planning and costing.

At the same time, Calibration Flow Meters are also very important for the control of material consumption in our industrial production process. Can effectively improve production efficiency. reduce manufacturing cost.

Flow Meter Calibration vs. Recalibration

Flow Meter Verification (Verification): Refers to the process of identifying and confirming whether measuring instruments meet the statutory requirements. It includes inspection, marking and/or issuing a certificate.

Flow Meter Calibration (Calibration): refers to the determination of the value indicated by a measuring instrument or measuring system, or the value represented by a physical measuring tool or reference material, and the corresponding value reproduced by a standard under specified conditions. A set of operations on relationships.

After reading the definition, there must be some confusion, right?
We usually summarize the main differences between verification and calibration into nine aspects:

Different purposes;
Objects are different;
According to different;
Different in nature;
The cycle is different;
In different ways;
The content of the certificate is different;
Different conclusions;
The authorities are different.

For quick understanding, we simply organize the following table:

Verification and Calibration	Verification	Calibration
Definition of Terms	Refers to the process of identifying and confirming whether measuring instruments meet the statutory requirements, which includes inspection, marking (or) issuing a verification certificate.	Refers to a set of operations to determine the relationship between the value indicated by a measuring instrument or measuring system, or the value represented by a physical measuring tool or reference material, and the corresponding value reproduced by the standard under specified conditions .
Character	It belongs to mandatory verification and has legality;	Users can voluntarily trace the source, which is not legal;
Certificate form	If the test result is qualified, a “Certificate of Test” shall be issued; If it is unqualified, a “Notification of Verification Result” shall be issued	Usually a “Calibration Certificate” or “Calibration Report” is issued; calibration results can also be expressed in the form of calibration curves or calibration factors
Specific method	According to the verification regulations, each point is verified 3 times at 100%, 50%, 20% and 100% of the full scale. If the original coefficient is qualified, the coefficient is not adjusted in principle.	According to the calibration procedure, at 100%, 50%, 20% and 100% of the full scale each point 3 times, adjust the coefficient to obtain the best performance near the user’s actual flow. The nameplate remains the same, but the certificate reflects the change.

How to Calibrate a Flow Meter？

The volumetric method is the most commonly used. This is a method of measuring the volume of fluid flowing into a constant volume container within the measurement time to obtain the flow rate.

The figure below is a schematic diagram of the typical structure of the static volume method water flow verification device. Verify the flow meter with pulse output, and replace 21 for verification of other output flow meters.

The commutator 13 is used to change the flow direction of the fluid so that water flows into the standard container (the standard container 15 or 16 can be selected according to the flow rate). The pulse counting controller 21 is triggered when the commutator 13 starts. To ensure the simultaneous measurement of water and pulse signal counts.

When calibrating, use the pump to draw the test fluid from the liquid storage container into the high level water tank. Then through the school flow meter. If standard container 15 is selected, then close drain valve 17, open drain valve 18, and commutator 13 is placed in the position that makes water flow to standard container 16.

After the flow is stabilized, the commutator 13 is started. Water flow is changed into standard container 15 by standard container 16. At the same time, the trigger pulse counter accumulates the pulse number of the calibrated flowmeter. When the predetermined water volume or preset pulse number is reached, the commutator will automatically change direction. Water flow is changed into standard container 16 by standard container 15. Read off the volume V of the fluid that enters the standard container during this period of time from the scale on the reading glass tube of the container. Record the number of pulses N displayed by the pulse count control 21 for the flow meter being calibrated.

Compare the pulse number N of the calibrated flowmeter with the obtained standard volume V to determine the instrument constant and accuracy of the calibrated flowmeter. The instantaneous flow rate of the flowmeter is indicated by the frequency indicator 20 .

The system accuracy of this method can reach 0.2%.

The mass method is a method of weighing the mass of the fluid flowing into the container within the measurement time to obtain the flow rate.

When calibrating, use a pump to draw the test fluid from the liquid storage container through the flowmeter to be calibrated and then enter the container containing the liquid. Measure the temperature of the fluid while weighing it out. It is used to determine the density value of the measured fluid at this temperature.

The volume of the fluid can be obtained by dividing the weight of the measured fluid by the density of the fluid at the measured temperature. Compare it with the volume indication (accumulated pulse number) of the meter. The meter constant and accuracy of the flowmeter to be calibrated can be determined.

The accuracy of this method system can reach 0.1%

The working principle of the standard volumetric tube method is based on the volumetric method (standard volumetric method), but it is a dynamic measurement.

The standard flowmeter comparison method is to connect the flowmeter to be calibrated and the standard flowmeter in series on the pipeline flowing through the test fluid. The error is calculated by comparing the two measured values. The accuracy of the standard flowmeter is 2 to 3 times higher than that of the schooled flowmeter.

The sonic nozzle gas flow standard device is a standard instrument based on the sonic nozzle. It is used to verify mass flowmeters, velocity flowmeters, volume flowmeters, rotameters, differential pressure flowmeters or other types of flowmeters. It is a standard device for measurement and testing units and large enterprises to measure and calibrate gas flowmeters.

According to the principle of aerodynamics, when the pressure ratio between the upstream and downstream of the factor nozzle reaches a critical state, the throat airflow reaches the peak velocity, and the mass flow through the nozzle also reaches the peak value. This value is only related to the parameter at the nozzle inlet and is not affected by changes in downstream conditions. Based on the above principles, this system uses the sonic nozzle as a standard meter to calibrate the measured flowmeter.

Read more about: 5 Factors Affecting Pressure Drop

Field Calibration Method You Must Know

Many users search How to Calibrate a Flow Meter? In order to understand how to adjust the accuracy of the flowmeter in your own working conditions.

On-site “flow comparison” means that the flowmeter is compared with other “reference flows” on site.

For example, the measured value of the temporarily clamped ultrasonic flowmeter, the volume of the liquid that has been measured over the flow in the piping system, etc. can be used as the “reference flow”.

For the meaning of terms such as on-site calibration, comparison and verification, please refer to the standard definitions in relevant documents, and will not repeat them here.

In practice, many professionals have explored various on-site comparison methods and indirect inspection methods. There are mainly 3 types:

(1) Use the container weighing method comparison of storage containers, working containers, pools or weighing instruments in the process. The pool volume comparison method is often used by water supply companies. Water plants can obtain high comparison accuracy by taking advantage of the favorable conditions of large-volume clear water pools.

(2) Reserve a position in the pipeline of the flowmeter to be tested for the flowmeter comparison method of connecting the reference flowmeter.

(3) Ultrasonic flowmeter comparison method of Clamp-on ultrasonic transducer. Clamp-on ultrasonic flowmeter is one of the three most promising methods of flow measurement. Especially the measurement accuracy error of existing foreign products is < ± 0.5%. This is conducive to the establishment of high-precision comparative detection and on-site online calibration system. It is convenient for the metrology and verification department to go to the site for calibration and testing.

Featured Calibration Flow Meters

**Low temperature Turbine Flowmeter-Liquid Nitrogen Flow Meter**

What Is Flush Diaphragm Pressure Transducer? When Use?

Posted on January 2, 2023 by KimGuo11

What Is Flush Diaphragm Pressure Transducer?

A flush diaphragm pressure transducer is a type of pressure sensor that measures the pressure of a fluid or gas by using a diaphragm. The diaphragm is flush with the surface of the vessel or pipe in which the pressure is being measured. These types of pressure transducers are commonly used in a variety of applications. Including process control, hydraulic and pneumatic systems, and fluid level measurement.

RFQ Pressure Transmitters

Flush Diaphragm Pressure Transducer Types

A flush diaphragm pressure transducer is a type of pressure sensor that measures the pressure of a fluid or gas by using a diaphragm that is flush with the surface of the sensor. This type of transducer is commonly used in applications where the pressure being measured is in contact with the transducer. Such as in hydraulic systems or in process control applications.

There are several types of flush diaphragm pressure transducers, including:

Capacitive flush diaphragm pressure transducers: These transducers use a capacitive sensing element to measure pressure. The diaphragm is typically made of a dielectric material. Such as ceramic or polycarbonate, which allows the transducer to measure the change in capacitance as the diaphragm moves in response to pressure.

Piezoresistive flush diaphragm pressure transducers: These transducers use a piezoresistive sensing element to measure pressure. The diaphragm is typically made of a piezoresistive material, such as silicon. Which allows the transducer to measure the change in resistance as the diaphragm moves in response to pressure.

Strain gauge flush diaphragm pressure transducers: These transducers use a strain gauge sensing element to measure pressure. The diaphragm is typically made of a material that deforms under pressure, such as metal or plastic. And the strain gauge measures the change in resistance as the diaphragm deforms.

Flush diaphragm pressure transducers are known for their high accuracy, fast response time, and low hysteresis. They are also typically easy to install, as they do not require any additional mounting hardware or seals. However, they are not as durable as other types of pressure transducers and may be susceptible to damage if they are subjected to high pressure or impact.

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**Remote Seal Differential Pressure Transmitter**

Flush Diaphragm Pressure Transducer Advantages

Flush diaphragm pressure transducers have a number of advantages that make them well-suited for use in a wide range of applications. Some of the key benefits of flush diaphragm pressure transducers are outlined below.

Sanitary design:

Widely used in food, sanitation and brewing industries. Feel the pressure directly with the hygienic flat membrane. The hygienic flat diaphragm prevents fouling, unhygienic and clogging by viscous liquids.

Accurate measurement:

Flush diaphragm pressure transducers are accuracy and reliability when it comes to pressure measurement. The flush diaphragm design allows the transducer to make a direct contact with the fluid or gas being measured. Which helps to eliminate the potential for to temperature or viscosity changes. This makes flush diaphragm transducers an ideal choice for applications where accurate measurement is critical.

Versatility:

Flush diaphragm pressure transducers can be used to measure a wide range of pressures, from low to high. Making them suitable for use in a variety of applications. They can be used to measure gauge, absolute, or differential pressure, and are available in a range of materials to suit different media. More about: Absolute Pressure Vs Gauge Pressure.

Easy installation:

Flush diaphragm pressure transducers are relatively easy to install and require minimal maintenance. They can be mounted in any orientation and do not require any additional components or sensors to function.

Robust design:

Flush diaphragm pressure transducers are designed to be rugged and durable. Making them suitable for use in harsh or demanding environments. They can withstand high temperatures, pressure spikes, and other extreme conditions without breaking or failing.

Long-lasting:

With proper care and maintenance, flush diaphragm pressure transducers can have a long service life. Making them a cost-effective choice for applications where they will be in use for an extended period of time.

In summary, flush diaphragm pressure transducers are an accurate, versatile, and reliable choice for pressure measurement in a variety of applications. They are easy to install, robust, and long-lasting, making them a popular choice among engineers and technicians.

Read more about: Calculation Of Pressure Drop

When to use Flush Diaphragm Pressure Transducer?

A flush diaphragm pressure transducer is a type of pressure sensor that is used to measure the pressure of a fluid or gas. It is called a “flush” diaphragm pressure transducer because it has a diaphragm that is flush with the surface of the sensor. This type of transducer is preferred in certain situations because it has several unique features and benefits.

A flush diaphragm pressure sensor is a pressure sensor designed with a smooth, flat surface that is flush with the process being measured. This makes them ideal for use in hygiene-sensitive industries. Such as food and beverage processing, pharmaceuticals and medical device manufacturing. Where it is important to minimize the risk of contaminants becoming trapped in crevices or protruding parts.

Flush diaphragm pressure sensors are used to measure the pressure of liquids, gases, and vapors in a variety of applications. Including process control, safety systems, and quality control. They are especially suitable for monitoring pressure changes in critical process streams. Such as fermentation in beer production or sterilization in medical device production.

One reason to choose a flush diaphragm pressure transducer is when the media being measured is highly viscous or contains particles that could damage the diaphragm of a traditional pressure transducer. The flush diaphragm design protects the diaphragm from being damaged by these mak contaminated it durable and reliable choice.

Another reason to choose a flush diaphragm pressure transducer is when the media being measured is at high temperatures. Traditional pressure transducers can be sensitive to temperature and may not provide accurate readings at high temperatures. The flush diaphragm design, on the others for hand, a more stable and accurate measurement at high temperatures.

In addition to these specific circumstances, flush diaphragm pressure transducers are often preferred in situations where a high level of accuracy and reliability is required. They are typically more expensive than traditional pressure transducers, but their durability and accuracy make them less susceptible to injury .

Overall, flush diaphragm pressure transducers are a useful tool for measuring the pressure of fluids and gases in a variety of applications. They are particularly well-suited for use in high temperature, high pressure, or high viscosity environments. And are preferred in situations where accuracy and reliability are of the utmost importance.

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A flush diaphragm is a type of mechanical device that is used to seal off or control the flow of a fluid through a pipe or passageway. It consists of a flexible membrane or diaphragm that is attached to a rigid frame and is positioned within a pipe or valve body.

The diaphragm is designed to move in response to changes in the pressure or flow of the fluid, allowing the device to open or close in order to regulate the flow of the fluid.

Flush diaphragms are commonly used in a variety of applications, including in process control systems, fluid handling equipment, and industrial piping systems. They are known for their durability, reliability, and ability to maintain a tight seal over a wide range of operating conditions.

This type of pressure sensor is also commonly known as: Flat film pressure sensor. Diaphragm pressure transmitter. Paint pressure sensor. Food pressure sensor. Diaphragm pressure sensor. Diaphragm pressure transmitter. Or sanitary pressure transmitter.

Flush diaphragm pressure sensor, including strain type and diffused silicon front type.

The strain-type flush-membrane measuring end adopts a special, sturdy flush diaphragm. Hard particles in the measured medium will not damage the isolating diaphragm. Compact structure, corrosion resistance, anti-vibration, anti-particle impact, wide temperature compensation.

Diffusion silicon front type is made of imported diffusion silicon core. Use calibration and digital compensation technology. The product has reliable performance and stable output.

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