Category Archives: Uncategorized

4-20 mA to 0-10 V Converter: Resistor Table, Wiring & PLC Scaling

Posted on by

A 4-20 mA current loop carries a sensor signal across hundreds of meters with near-zero drift. A 0-10 V PLC card cannot accept that current directly. Converting between the two is a five-cent fix on the bench (one resistor) or a forty-dollar fix in the panel (a signal converter). This guide gives you the resistor table, the wiring diagram, the PLC wiring conventions, and the decision rule for picking each.

Contents

4-20 mA to 0-10 V Conversion at a Glance

4-20 mA to 0-10 V signal converter direction diagram

Two paths exist. A precision resistor across the PLC analog input converts current to voltage by Ohm's law. An active signal converter does the same job but adds galvanic isolation and a true zero-based output. Pick the resistor for short cable runs and grounded single-PLC systems. Pick the converter when ground loops, long runs, or true 0-10 V output matter. Reviewing how a 4-20 mA transmitter generates the loop helps clarify why the live-zero matters.

One trap catches new technicians weekly: a 500 Ω resistor produces 2-10 V, not 0-10 V. The 4 mA live zero of the loop drops 2 V across 500 Ω. If the PLC card requires the input to start at 0 V (some 12-bit modules do, others scale from any value), the resistor method needs software offset or an active converter with zero adjustment.

Resistor Sizing Table for Common Output Ranges

Voltage at the PLC input equals current times resistance. The 4 mA endpoint sets the low voltage; 20 mA sets the high. Most plants standardize on 250 Ω (1-5 V) or 500 Ω (2-10 V) so spares interchange.

ResistorOutput @ 4 mAOutput @ 20 mASpanTypical PLC card
125 Ω0.5 V2.5 V0.5-2.5 VLow-voltage ADC, microcontroller
250 Ω1.0 V5.0 V1-5 VAllen-Bradley 1492-IFM, legacy DCS
500 Ω2.0 V10.0 V2-10 VSiemens S7-1200/1500 0-10 V mode
250 Ω + opamp offset0 V4 V0-4 VCustom analog front-end

Specify 1% or 0.1% metal-film resistors at 0.25 W or higher. At 20 mA through 500 Ω the dissipation is I²R = 0.0004 × 500 = 0.2 W, so a quarter-watt part is borderline; jump to 0.5 W if the resistor sits inside a hot panel. Wirewound and carbon-film parts drift with temperature and should not be used for analog instrumentation. The same precision rule applies whenever you read engineering units back from a sensor — resistor error multiplies straight into reported value.

Wiring the Resistor Across the PLC Analog Input

Three terminals do the work: the transmitter positive (+), the PLC analog input (AI), and the PLC common (COM). The resistor goes between AI and COM, the transmitter loop closes through the AI terminal.

  • Wire the transmitter + to the 24 VDC supply positive (most transmitters are loop-powered).
  • Wire the transmitter − (current return) to the PLC AI terminal.
  • Wire the PLC COM terminal to the 24 VDC supply negative.
  • Install the precision resistor across AI and COM (parallel to the input impedance).
  • Keep the resistor lead length under 20 mm to limit thermal EMF and pickup noise.

On terminal blocks, mount the resistor on the panel side, not at the transmitter side. This keeps the 4-20 mA loop full-length (high immunity) and only the short voltage span sees the PLC. Our pressure transmitter installation guide covers the loop-powered vs self-powered (4-wire) wiring variants for reference.

PLC Scaling: Why 500 Ω Gives 2-10 V, Not 0-10 V

The 4 mA live zero is the cause. 4 mA × 500 Ω = 2 V. The PLC reads 2 V at the bottom of the sensor range, not 0 V. Two options correct this in software:

  • Two-point scaling: Engineering value = (raw_V − 2) / 8 × full_scale. The 8 is the 10-2 V span. Built into most modern PLC scale function blocks (SCL, SCP, FC105).
  • Offset correction: Add a -2 V offset before the standard 0-10 V scale block. Works on older HMIs that lack two-point scaling.

A common error is mapping 0-10 V raw counts directly to 0-100% engineering units. This compresses the live signal range to 80% and shifts zero by 20%. Field calibration will look fine at mid-scale and fail at endpoints, which is hard to diagnose without a multi-point bench calibration.

Signal Converter vs Resistor: Decision Matrix

A passive resistor wins on cost and simplicity. An active signal converter wins on isolation, true zero-based output, and long cable immunity. Use the matrix to pick.

CriterionResistor (passive)Signal converter (active)
Cost per channel< $1$30-$120
Galvanic isolationNone1500-3000 V typical
True 0-10 V outputNo (gives 2-10 V)Yes
Ground loop immunityVulnerableImmune
Cable length tolerance< 50 m typical> 500 m with shielded twisted pair
Field calibrationNone neededTrim pots or DIP switches
Failure modeOpen = no signal; short = full-scaleDiagnostic LED, fault output

A DIN-rail signal converter handles 4-20 mA ↔ 0-10 V either direction, with 24 VDC loop power, 2500 V isolation, and 0.1% accuracy. For hazardous-area service, look for an IECEx/ATEX zener barrier with isolated output in the same form factor. When the signal then feeds a SCADA-level analog input bank, the isolated converter also limits common-mode voltage entering the supervisory layer.

Reverse Path: 0-10 V to 4-20 mA

VFDs, lab power supplies, and HMI analog outputs often produce 0-10 V. Sending that signal to a DCS that expects 4-20 mA requires the reverse converter: a V/I converter chip (XTR110, AD694) on a board, or a packaged DIN-rail unit. Passive conversion is not possible — a resistor cannot generate a current loop. Loop power must come from somewhere, typically the DCS analog input itself or an external 24 VDC supply.

Common Mistakes in Field Installations

  • Resistor on the wrong side of the loop. Mounting at the transmitter cuts loop length immunity in half.
  • Using 250 Ω on a 0-10 V card. Output peaks at 5 V; PLC reads 50% at full sensor span.
  • Mixing carbon and metal-film resistors in spare-parts inventory. Temperature drift kills accuracy on outdoor panels.
  • Skipping isolation when sharing 0 V reference between multiple PLC racks. Ground loops appear as 50/60 Hz noise on the voltage signal.
  • Forgetting the live zero in PLC code. Process readings stuck at −25% LRV at idle are the symptom.

SI-300 Pressure Transducer (4-20 mA / Voltage)

Ranges 0-1000 bar | Output 4-20 mA, 0-5 V, 0-10 V | Accuracy ±0.25% FS — ships with selectable output for direct PLC wiring.

R7100 Universal-Input Paperless Recorder

Accepts 4-20 mA, 0-10 V, mV, RTD, thermocouple on the same channel — no resistor or converter required to log mixed-signal field instruments.

SI-512H High-Temperature Pressure Sensor

Process temp up to 800 °C | 4-20 mA two-wire output | Cooling fin design — for steam, hot oil, furnace headers feeding PLC analog inputs.

FAQ

What resistor converts 4-20 mA to 0-10 V?

A 500 Ω precision resistor gives 2-10 V, not 0-10 V, because the 4 mA live zero drops 2 V across 500 Ω. For a true 0-10 V output, use an active signal converter with zero adjustment, or apply two-point scaling in PLC code to handle the 2 V offset.

Why does 500 Ω not give 0 V at 4 mA?

Ohm's law: 4 mA × 500 Ω = 2 V. The 4 mA "live zero" is intentional. It lets the receiver detect a broken loop (0 mA = fault) versus a valid low reading. The 2 V offset must be handled in software or by an active converter.

What resistor for 4-20 mA to 1-5 V?

250 Ω. 4 mA × 250 Ω = 1 V; 20 mA × 250 Ω = 5 V. Specify 0.1% tolerance metal film, 0.25 W. The 1-5 V range was common on legacy DCS systems and still appears on some older Allen-Bradley 1771 modules.

Do I need an isolator between the sensor and PLC?

Yes, if the sensor and PLC share a long cable run (over ~50 m), if either device has a separate ground reference, or if 50/60 Hz hum appears on the signal. A DIN-rail signal isolator with 1500-3000 V galvanic isolation breaks the ground path.

Need spec help, a wiring drawing for a specific PLC, or a price on a DIN-rail signal converter? Send your project details — our instrumentation engineers reply within one business day.

Request a Quote

Please enable JavaScript in your browser to submit the form

Turbine Flow Meter Application Case: Demineralized Water

Posted on by

Turbine flow meter is a device used to measure the flow rate of fluids by using a turbine to detect changes in flow velocity. Well, in pharmaceutical manufacturing, precise flow measurements are crucial for ensuring product quality, consistency, and safety. That’s where turbine flow meters come in.
In this blog post, we’ll be taking a closer look at how turbine flow meters are used to measure demineralized water flow in the pharmaceutical industry. And the benefits they provide. So, let’s dive in and explore this exciting application case together!

RFQ

A turbine flow meter is a type of flow meter that works by measuring the velocity of a fluid or gas as it passes through a turbine rotor. Turbine flow meters are commonly used to measure the flow of liquids and gases in a wide range of applications. They offer a high level of accuracy, especially in high flow rate applications, and can be used for both clean and dirty fluids. Turbine flow meters are also relatively easy to install and maintain, making them a popular choice in many industries.

The working principle of the turbine flowmeter is that a turbine is placed in the center of the pipe, and the two ends are supported by bearings.

As the fluid passes through the flowmeter tubes, it strikes the turbine blades. Generates driving torque to the turbine. Make the turbine rotate by overcoming the conflicting moment and the fluid resistance moment.

In a certain flow range, for a certain fluid medium viscosity, the rotational angular velocity of the turbine is proportional to the fluid flow velocity.

Thus, the fluid flow rate can be obtained from the rotational angular velocity of the turbine. The fluid flow through the pipe can then be calculated.

Turbine flow meters are widely used in various industries for measuring the flow rate of liquids and gases. Here are some common applications of turbine flow meters:

Petroleum industry: Turbine flow meters are used to measure the flow of crude oil, refined products, and natural gas in pipelines and other process applications.

Chemical industry: Turbine flow meters are used to measure the flow of acids, alkalis, solvents, and other chemicals in various chemical processing applications.

Water and wastewater treatment: Turbine flow meters are used to measure the flow of water and wastewater in municipal water treatment plants, wastewater treatment plants, and other applications.

Food and beverage industry: Turbine flow meters are used to measure the flow of liquids such as milk, juices, beer, and other beverages in food and beverage processing plants.

Pharmaceutical industry: Turbine flow meters are used to measure the flow of liquids in pharmaceutical manufacturing processes, such as the production of drugs, vaccines, and other medical products.

HVAC industry: Turbine flow meters are used to measure the flow of air and water in heating, ventilation, and air conditioning systems.

Overall, turbine flow meters are widely used in applications that require accurate measurement of flow rate. Such as process control, quality control, and monitoring of production processes.

Demineralized Water Flow Measurement Case Study

Challenges in measuring demineralized water flow

Demineralized water: water that has been softened. That is to say, the water with part or all of the calcium and magnesium ions removed is the water that does not form scale after boiling. Boilers must use this water.

Demineralized water is super important in making medicine because it needs to be pure and clean. But measuring how much of this water is flowing can be tricky for a few reasons.

  1. The water doesn’t conduct electricity very well, which makes it hard to measure with regular equipment that relies on conductivity.
  2. It needs to be measured with really good equipment that won’t make it dirty.
  3. Air bubbles can form in the water, which messes up the measurements and might even break the equipment.
  4. Temperature changes can also mess up the measurements because the water gets thicker or thinner depending on how hot or cold it is.
  5. The equipment that measures the water flow needs to be taken care of and maintained regularly, which can be a big job, especially in large factories.

So, even though measuring the flow of demineralized water is important, it can be a challenge because of these issues.

Demineralized Water Flow Measurement in a pharmaceutical factory.

Soft water flow measurement in a pharmaceutical factory.
Not long ago, we received an inquiry from a customer about a flow meter for measuring softened water.

After communication, I learned that this is a large local pharmaceutical factory. Therefore, after detailed communication, we learned that the customer needs to install a flow meter for measuring the flow of purified water on the equipment in the newly added pharmaceutical workshop. It is convenient for online real-time monitoring of softened water flow. Conducive to the management of ingredients, saving labor and time costs.

Considering the relatively low conductivity of demineralized water, it is not suitable to use electromagnetic flowmeters. We recommended liquid turbine flowmeters with sensitive response and high precision to our customer.

Featured Turbine Flow Meters

Low temperature Turbine Flowmeter-Liquid Nitrogen Flow Meter
Liquid Turbine Flow Meter
Turbine Insertion Flow Meter
Turbine Sanitary flow meter

More applications and markets for Turbine Flow Meters

Crude Oil Flow Meter

Crude Oil Flow Meter refers to a type of flow meter that can accurately monitor and measure the flow of…

So, to sum it up, measuring water flow accurately is really important in the pharmaceutical industry, especially when it comes to demineralized water. But, using turbine flow meters can help us measure the water flow more accurately, even though there are challenges like low conductivity and air bubbles. These meters are also easy to maintain and won’t make the water dirty.

In the future, we can expect to see more use of turbine flow meters in the pharmaceutical industry because everyone wants better and more consistent products. With advances in technology and better understanding of the importance of accurate flow measurement, these meters will probably become even more popular.

As Turbine Flow Meters’ Reliable Manufacturer, Sino-Inst Continue to provide users with cost-effective products and services.

Request a Quote

Please enable JavaScript in your browser to submit the form

Ultrasonic Flow Detectors

Posted on by

Ultrasonic flow detectors are an important part of ultrasonic flow meters. Ultrasonic flow detectors are also called ultrasonic transducers. Ultrasonic flow detectors measure the volumetric flow of liquid within closed conduits. Ultrasonic flow meters use transit-time differences for measuring flow rates inside pipes from the outside using electronics and digital signal processing technology.

Get a Quote Ultrasonic Flow Meters

Featured Ultrasonic Flow Meters Clamp-on

Portable Ultrasonic Flow Meter
Handheld Ultrasonic Flow Meter
Clamp on Ultrasonic Flow Meter
Ultrasonic Clamp on Flow Meter
Strap on flow meter X3

Features of Ultrasonic Flow Detectors

  • Built-in magnet, which can be directly attached to the pipe;
  • Can be used in strong electromagnetic interference occasions;
  • After the junction box is filled with glue, the protection level is IP68;
  • Complete specifications, divided into three models: large, medium, and small;
  • Measuring pipe diameter range DN15-DN6000;
  • The temperature range is -30~90°℃; -30~160℃
  • The measurement liquid is relatively wide, including water, seawater, slurry or oil, acid and alkali, and other homogeneous liquids;
  • Non-contact measurement method, lightweight and small size;
  • The installation of the clamp-on ultrasonic flowmeter probe is simple. And different sizes of probes can detect pipes of different pipe diameters. Under the condition of ensuring accuracy, the clamp-on ultrasonic flowmeter can measure the smallest pipe of DN15. The largest can measure DN6000 pipeline;
  • The external clamp ultrasonic flowmeter does not need to destroy the pipeline in the process of measuring the flow rate. The probe can directly touch the straight pipe section. No pressure loss. The flow measurement can be performed on the already installed pipe;
  • Suitable for measuring pipes of different materials. Common ones are metal pipes: stainless steel, carbon steel, cast iron, etc., plastic pipes, etc. There are also pipes with better sound-permeable materials.

Optional Ultrasonic Flow Detectors

Types Picture Spec. Model Measurement Range Temperature Dimension
Clamp on
Small Size TS-2 DN15~DN100 -30~90℃ 45×25×32mm
Medium Size TM-1 DN50~DN700 -30~90℃ 64×39×44mm
Large Size TL-1 DN300~DN6000 -30~90℃ 97×54×53mm
High Temperature Clamp on Small Size TS-2-HT DN15~DN100 -30~160℃ 45×25×32mm
Medium Size TM-1-HT DN50~DN700 -30~160℃ 64×39×44mm
Large Size TL-1-HT DN300~DN6000 -30~160℃ 97×54×53mm
Mounting Bracket Clamp on Small Size HS DN15~DN100 -30~90℃ 318×59×85mm
Medium Size HM DN50~DN300 -30~90℃ 568×59×85mm
Extended EB-1 DN300~DN700 -30~90℃ 188×59×49mm
High Temperature Mounting Bracket Clamp on Small Size HS-HT DN15~DN100 -30~160℃ 318×59×110mm
Medium Size HM-HT DN50~DN300 -30~160℃ 568×59×110mm
Extended EB-1-HT DN300~DN700 -30~160℃ 188×59×49mm
MoeldX3-φ6.35X3-φ9.53 X3-φ12.7X3-φ15X3-φ20X3-φ25
Weight(KG)0.910.910.90.90.840.84
MoeldX3-φ32X3-φ40X3-φ50X3-φ63X3-φ75X3-φ99
Weight(KG)0.820.880.981.431.521.95

Ultrasonic Flow Detectors Working Principle

Ultrasonic Flow Detectors are also called ultrasonic transducers. In fact, it is a piezoelectric ceramic whose frequency is the same as its resonant frequency. It uses the piezoelectric effect of the material to convert electrical energy into mechanical vibration.

Under normal circumstances, ultrasonic waves are first generated by an ultrasonic generator. It is converted into mechanical vibration by the ultrasonic transducer. The ultrasonic wave can be generated by the ultrasonic wave deriving device and the ultrasonic wave receiving device.

Ultrasonic transducers mainly include shell, acoustic window (matching layer), piezoelectric ceramic disc transducer, backing, lead-out cable, receiver, and other parts.

Among them, the piezoelectric ceramic disc transducer plays the same role as a general transducer. It is mainly used to transmit and receive ultrasonic waves, and above the piezoelectric ceramic disc transducer is the receiver. It is mainly composed of lead cables, transducers, metal rings, and rubber washers. Used as an ultrasonic receiver. Receive the Doppler dial-back signal generated outside the frequency band of the piezoelectric ceramic disc transducer.

Ultrasonic transducers are piezoelectric ceramics that resonate at ultrasonic frequencies. The piezoelectric effect of the material converts electrical signals into mechanical vibrations. The ultrasonic transducer is an energy conversion device. Its function is to convert the input electric power into mechanical power (ultrasound) and then transmit it out. , It consumes a small part of its own power.

Types of ultrasonic transducers: can be divided into piezoelectric transducers, sandwich transducers, cylindrical transducers, inverted horn transducers, and so on.

Frequently
Asked
Questions

Help Center

Transit Time Ultrasonic Flow Meter adopts the measurement principle of the time difference method. It uses the ultrasonic wave emitted by the sensor to propagate in the flowing fluid. The sound wave propagation speed in the downstream direction will increase, and the backward direction will decrease. In the same propagation distance, there will be different transmission times. According to the difference between the transmission time and the measured The relationship between fluid velocity measures the fluid velocity.

The flow rate of the fluid is different in different positions in the tube. The flow rate in the center of the tube is faster than the flow rate near the wall of the tube. The flow velocity distribution of the fluid in the pipeline can be represented by the flow velocity cross-sectional distribution diagram.

By setting the flowmeter and considering the cross-sectional distribution of the flow velocity, the average flow velocity can be calculated. Then the volume flow of the fluid can be obtained according to the cross-sectional area of the pipe.

Extended reading: Ultrasonic flow detectors types

Notes:
V measure fluid velocity
M ultrasonic reflection times
D pipe diameter
θ The angle between the ultrasonic signal and the fluid
T up The time when the downstream sensor transmits the signal to the upstream
T down Time from upstream sensor to downstream
ΔT = T up – T down

Guess You’ll Like: Ultrasonic flow meters types & technical guide

Doppler ultrasonic flowmeter uses the physical principle of Doppler frequency shift to measuring the water flow velocity. Therefore, the Doppler ultrasonic flowmeter is suitable for measuring fluids containing solid particles or air bubbles. Not suitable for measuring pure water.

The scope of use includes:
Natural rivers, artificial rivers, farmland channels, urban sewers, corporate sewage outlets, sewage treatment plants, etc.

The products comply with the SL/T 186-1997 standard.

It is suitable for environments that require continuous and accurate measurement of flow rate and flow rate. It has obvious advantages such as convenient installation and maintenance, high reliability, and high precision.

Ultrasonic flow detectors are also called ultrasonic transducers. Or it is often understood by people as an ultrasonic flow sensor.

Ultrasonic flowmeter is an application of ultrasonic, which measures the flow of liquid by applying the speed difference method.

  • Can do non-contact measurement;
  • No flow obstruction measurement, no pressure loss;
  • It can measure non-conductive liquids, which is a supplement to the electromagnetic flowmeter for unobstructed measurement;
  • Except for the pipe section type with measurement, there is generally no need for actual flow calibration;
  • In principle, it is not limited by pipe diameter, and its cost is basically independent of pipe diameter.

Related blogs

Sino-Inst, Manufacturer for Ultrasonic Flow Meters. It can measure a single sound-conducting liquid medium of DN 25—150mm. It can measure even liquids such as water, seawater, oil, and slurry.

Sino-Inst’s Ultrasonic Flow Meter, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

Ultrasonic Clamp on Flow Meter

Posted on by

Ultrasonic Clamp on Flow Meter is composed of an integrated host and external clamp on sensors. Clamp on Flow Sensors are available at room temperature and high temperature.

Clamp on flow meter (Model: 2000) is composed of an integrated host and ultrasonic clamp on sensor. Clamp on flow meter is widely used in online flow measurement of various liquids. Just stick the external clamp sensor on the pipe surface. Compared with the traditional flowmeter, it does not need to cut off the pipe and flow. The installation is convenient and quick, and the non-destructive installation is truly realized.

Clamp on Flow Meter Reference price: USD 470.00/pc

Sino-Inst offers a variety of  Ultrasonic flow meters for flow measurement. If you have any questions, please contact our sales engineers.

Request a Quote
Ultrasonic Flow Meters

Features Of Ultrasonic Clamp-on Flow Meter

  • High Accuracy measuring 
    • Linearity: better than 0.5%, Repeatability: better than 0.2%, Accuracy: better than ±1% 
  • Wide Measuring Range 
    • Several types transducer for selection, measuring pipe size from DN15mm to DN6000mm
  • English menu
    • Different version UFM can support English display, easy to operate
  • High Reliability
    • Adopt low voltage, multi-pulse technology to improve accuracy, useful life and reliability
  • Strong Anti-interference
    • Dual-balance signal differential receiver/driver circuit to avoid interference of converter, TV tower, high voltage line etc.
  • Powerful Recording Function
    • Automatically record the following data:
    • 1. The totalizer data of the last 512 days/128 months/5 years
    • 2. The time and corresponding flow meter of the last 64 times of power on and off events
    • 3. The working status of the last 32 days

Optional transducers for Ultrasonic Clamp on Flow Meter

Optional Host

According to different installation condition, there are many models separated ultrasonic flowmeter for selection:

Wall-mount-plastic
Wall-mount-cast aluminum
Panel-mount
Modular host
Explosion-proof
Fixed Mounted

Specifications of Ultrasonic Clamp on Flow Meter

Item Performance and Parameter
Convertor Principle transit-time ultrasonic flowmeter
Accuracy

Flow: over 1%-2%(battery-powered supply over ±2% )，Heat: over ±2%，Repeatability: over 0.2%
Display

2×20 character LCD with backlight, support the language of Chinese, English and Italy Convertor dimension:170*180*56cm
Operation Support 16 key light touch keyboard and the Simulation keyboard software
Signal Output

1 way 4~ 20mA output, electric resistance 0~ 1K，accuracy0. 1%

1 way OCT pulse output ( Pulse width 6 ~ 1 0 0 0 ms，default is 2 0 0 ms)
1 way Relay output
Signal Input

3 way 4~ 20mA input, accuracy 0. 1%，acquisition signal such as temperature, press and liquid level

Connect the temperature transducer Pt100, can finish the heat/energy measurement
Data interface

Insulate RS485 serial interface, upgrade the flow meter software by computer, support the MODBUS, METER-BUS etc.
Other Function Automatically remember the previous flow/energy data of 512 days,  128 months and 10 years
Automatically remember the previous flow/energy data of 512 days working condition and check it
Automatically remember the previous 32 times power on/off time and flow rate
Special Cable

Twisted-pair cable, generally, the length under 50 meters; Select the RS485 communication. The transmission distance can over 1000m.
Pipe Installation Condition Pipe Material

Steel, Stainless steel, Cast iron, Copper, Cement pipe, PVC, Aluminum, Glass steel product, liner is allowed.
Pipe Diameter 15mm—6000mm
Straight length pipe

Transducer installation should be satisfied: upstream10D, downstream 5D, 30D from the pump.
Measuring Medium Type of Liquid

Water (hot water, chilled water, city water, sea water, waste water, etc.);  Sewage with small particle content; Oil (crude oil, lubricating oil, diesel oil, fuel oil, etc.);  Chemicals (alcohol, acids, etc.); Plant effluent; Beverage, liquid food;  Ultra-pure liquids; Solvents and other liquids

More about: Sewage Flow Meter Selection
Temperature

Standard Transducer: -30–90℃; High-temperature transducer: -40–160℃
Turbidity No more than 10000ppm and less bubble
Flow rate 0–±12 m/s
Working Environment Temperature Main Unit: -20–60℃
Flow transducer: -40–160℃; 
Temperature transducer: according to the customer’s demands.
Humidity

Main Unit: 85% RH; Flow Transducer: Ip67
Power Supply DC  24V or AC  85-264V
Power Consumption 1.5W

Extended reading: Portable ultrasonic flow meter for water

Ultrasonic clamp on flow meter Pros and Cons

Advantages of Ultrasonic clamp on flow meter

  • The clamp on ultrasonic flowmeter is convenient to carry, easy to operate, intuitive to read data, and can memorize and save the read data;
  • The measurement liquid is relatively wide, including water, sea water, slurry or oil, acid and alkali and other homogeneous liquids;
  • Non-contact measurement method, light weight, small size;
  • The installation of the clamp-on ultrasonic flowmeter probe is simple, and probes of different sizes can detect pipes of different pipe diameters. Under the condition of ensuring accuracy, the clamp-on ultrasonic flowmeter can measure pipes with a minimum of DN15 and a maximum of DN3000. Pipeline
  • The external clamp ultrasonic flowmeter does not need to destroy the pipeline during the flow measurement process, and the probe can directly touch the straight pipe section without pressure loss, and the flow measurement can be performed on the installed pipe;
  • Suitable for measuring pipes of different materials. Common metal pipes (stainless steel, carbon steel, cast iron, etc.), plastic pipes, etc., and some pipes with better sound-transmitting materials.

Disadvantages of Ultrasonic clamp on flow meter

Because the temperature of the measured liquid is limited by the temperature resistance of the coupling material between the ultrasonic probe and the pipe, and the original data of the sound transmission velocity of the measured liquid at high temperature is incomplete. At present, the general ultrasonic flowmeter can only be used to measure the fluid below 200 ℃.

The measurement circuit of ultrasonic flowmeter is more complicated than that of general flowmeter. This is because the flow velocity of liquid in general industrial measurement is often a few meters per second, and the propagation speed of sound waves in the liquid is about 1500 m/s.

Therefore, the change of the measured fluid velocity (flow) has the greatest impact on the change of sound velocity, which is also on the order of 10-3. If the accuracy of measuring the flow velocity is required to be 1%, the accuracy of the measurement of the speed of sound needs to be 10-5~10-6 orders of magnitude. Therefore, a complete measurement circuit can be achieved.

This is the reason why ultrasonic flowmeters can only be applied in practice only under the premise of the rapid development of integrated circuit technology.

The measurement accuracy is not high enough. At present, the accuracy level of our ultrasonic flowmeters is generally level 1 or lower. Ultrasonic flow meters are greatly affected by external conditions. For example, high electric and magnetic fields near the measuring pipeline will affect the measurement of the ultrasonic flowmeter.

Read more about: Non-invasive Ultrasonic Tank Level Sensor Working Principle

Portable clamp on flow meter

Portable Ultrasonic Flow Meter

The portable ultrasonic flowmeter ( Model: 3000H) uses a non-invasive sensor to measure liquid flow. The installation process is extremely simple. There is no need to destroy the pipeline during the measurement process and no need to stop production. The sensor is not in contact with the measured medium. Battery powered, small size, light weight and easy to carry. Realize the real sense of mobile flow measurement, online detection, is a real sense of portable ultrasonic flowmeter.

Handheld Ultrasonic Flow Meter

Handheld Ultrasonic Flow Meter

Handheld Ultrasonic Flow Meter ( Model:2000H) has been successfully applied to measurement work in various industries. The measuring range is 20-6000mm (0.5-20 inches). A non-contact measurement method is adopted. Flexible operation and easy to carry. Conductive or non-conductive, corrosive or non-corrosive liquids can be measured. Various fluids: water, pure water, sewage, sea water, chemical fluids, river water, fuel Oil etc. can be measured.

Check more 1 Inch Flow Meters.

Clamp on Ultrasonic Flow Meter

Clamp on Ultrasonic Flow Meter

Clamp on Ultrasonic Flow Meter ( Model: 3000S) is composed of a host and an external clamp sensor. The flow measurement of various liquids can be completed by simply sticking the external clamp sensor on the surface of the pipeline. Compared with the traditional flowmeter, it does not need to cut off the pipe and flow, the installation is convenient and quick, and it truly realizes the lossless installation. Compared with the common TDC algorithm of other manufacturers, TGA measurement technology is an algorithm for measuring process time with higher speed and higher accuracy.

Clamp on liquid flow meter

The external clamp ultrasonic flowmeter can measure the flow rate of a single uniform liquid that can conduct ultrasonic waves, such as water, sea water, sewage, acid and alkali, alcohol, beer, various oils, etc.

Read more about Digital Beer Flow Meters for Sale|Brewery-Wine-Craft Beer Brewing Process management system 

Clamp on water flow meter

Clamp on water flow meter refers to the use of external clamp-on ultrasonic flow meters to measure water flow. Especially when other flow meters are not applicable.

For example, the flow measurement of ultrapure water equipment only uses an external clamp-type ultrasonic flowmeter.
why?

Ultra-pure water is non-conductive and has extremely high hygiene requirements, so the clamp-on ultrasonic flowmeter is the first choice. The general contact measurement and conductive medium measurement methods will be excluded. Let’s analyze it in detail below.

First, let’s take a look at the physical characteristics of pure water and ultrapure water. The filter cartridge of the ultra-clean filter device is made of pure polypropylene, and activated carbon is used to remove inorganic and organic trace pollution of ion exchange resin (nuclear grade) and adsorber resin. Dedicated ion exchange resin (nuclear grade) removes inorganic ions. After the adsorber resin removes dissolved organic matter. The pore size of the disinfection filter is 0.2um. The conductivity of pure water and ultrapure water obtained through such purification equipment: 0.055uS/cm. Bacteria content: 1CFU/ml, generally used in fields with high requirements such as biopharmaceuticals.

Secondly, we look at the application conditions of various flow meters.

In addition to measuring the volume flow of general conductive liquids, the electromagnetic flowmeter can also be used to measure the volume flow of strong corrosive liquids such as strong acids and alkalis and uniform liquid-solid two-phase suspension liquids such as mud, mineral pulp, and paper pulp. Since the conductivity of pure water is only 0.055, it cannot be measured.

Look at the turbine flowmeter again. Turbine flowmeter is a contact measurement, and pure water and ultra-pure water have particularly high requirements for materials, so the main material must be 316L when manufacturing, and the use of sanitary clamp joints will increase the production cost immediately.

Clamp on water flow meter is a non-contact meter. It can not only measure the flow of medium with large pipe diameter, but also can be used to measure the medium that is not easy to touch and observe. Its measurement accuracy is very high, and it is almost free from the interference of various parameters of the measured medium. In particular, it can solve the flow measurement problems of strong corrosive, non-conductive, radioactive and flammable and explosive media that other instruments cannot.

In summary, the ultrasonic flowmeter is the best choice for the flow measurement of the purified water equipment in the ultrapure water system.

FAQ

Strap on flow meter X3

The clamp-on flow meter is a flow meter with an external clamp-on flow sensor. Most flow meters are in-line pipe section mounts. The Clamp-on flow meter is a flow meter that only needs to be clamped on the outside of the pipe to measure the flow rate. This is important for many pipes that cannot be cut and bored.

The installation of the ultrasonic flow meter needs to be done according to the operating instructions of the ultrasonic. Because of different forms of ultrasonic flowmeter, the installation method is also different.

Sino-Inst supplies ultrasonic flow meters with an accuracy of mostly 1%. This accuracy can meet the needs of most users. Of course, there are other flowmeters with higher accuracy. For example, 0.5% electromagnetic flowmeter.

Users can choose according to your measurement requirements.

Sino-Inst, Manufacuturer for Ultrasonic Clamp on Flow Meters. It can measure a single sound-conducting liquid medium of DN 25—1200mm. It can measure even liquids such as water, sea water, oil, and slurry.

Sino-Inst’s Ultrasonic Clamp on Flow Meter, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

Hello world!

Posted on by

Welcome to WordPress. This is your first post. Edit or delete it, then start writing!