Differential Pressure Transmitter
Differential pressure transmitter is a transmitter that measures the pressure difference between the two ends of the transmitter. It converts the differential pressure signal into a quasi-signal 4-20mA output. It can also be configured with HART, RS485 communication.
Differential pressure transmitter can be configured with traditional installation or remote diaphragm seal installation. It is widely used to measure the liquid level, density, differential pressure and flow of liquids, gases or steam.
- Differential pressure transmitters produced by Sino-Inst can reach an accuracy of 0.075%;
- Comprehensive performance, can measure the pressure, differential pressure, liquid level, density and flow of the medium;
- Standard 4-20mA and HART protocol digital signal transmission, remote control;
- Explosion-proof structure meets harsh environments;
- High static pressure and high overload protection.
Featured Differential Pressure Transmitters/Transducers
Sino-Inst’s differential pressure transmitters are widely used in various industries for differential pressure measurement. The differential pressure transmitter measures the differential pressure between any two pressure points that need to be measured, that is, the low pressure side and the high pressure side. Then it outputs 4-20mA, HART, RS485, etc.
Sino-Inst’s differential pressure transmitters have stable performance and are resistant to high static pressure. They effectively improve process efficiency for many users.
Sino-Inst supplies various types of differential pressure transmitters. Including differential pressure transmitters based on single crystal silicon, capacitive, diffused silicon and other principles.
The accuracy of the differential pressure transmitter can be as high as 0.075%FS. Conventional accuracy can be selected as 0.1%FS, 0.2%FS, 0.5%FS, etc.
Configured with waterproof connectors and stainless steel explosion-proof connectors. Optional explosion-proof type ExdllBT5Gb, intrinsically safe type ExialCT4/T5/T6Ga. Used in hazardous environments.
Differential pressure transmitters can be configured with stainless steel capillaries, diaphragm flanges, etc. The materials of the flanges and isolation diaphragms can be customized. 316 stainless steel, Hastelloy C, Monel, Tantalum, etc.
Choose Sino-Inst for More Stable Differential Pressure Measurement
Differential pressure transmitters can be used for differential pressure measurement and pressure measurement. They can measure gas, liquid, steam and other measuring media.
Sino-Inst has rich experience in producing differential pressure transmitters. Currently we supply differential pressure transmitters to users in many industrial fields.
Differential Pressure Transmitters Industrial Applications
Differential Pressure Transmitter Measures Differential Pressure
The differential pressure transmitter can be used to monitor the differential pressure between two pressure ports in the fluid and output a signal.
It can determine whether the fluid pressure is normal and perform corresponding control.
Differential Pressure Transmitter Measures Liquid Level
The differential pressure transmitter can measure the liquid level by measuring the pressure difference of the liquid at different heights. By measuring the output signal of the differential pressure transmitter, the height of the liquid level can be determined. It is mostly used for liquid level monitoring in sealed tanks.
Differential Pressure Transmitter Measures Density
The intelligent differential pressure density meter adopts the principle of differential pressure density meter. The density value is calculated according to the differential pressure value of the medium at a certain vertical distance. And it automatically compensates, with high accuracy, good reliability, and simple installation and use.
Differential Pressure Transmitter Measures Flow
The differential pressure transmitter can calculate the flow rate of the fluid by measuring the pressure difference generated by the fluid in the pipeline. According to Bernoulli’s theorem. The differential pressure transmitter can be used for flow measurement and calculation of liquid, gas and other media.
More Information
Differential Pressure Transmitter Working Principle
The basic principle of differential pressure transmitter is:
A space is divided into two chambers by a sensitive element (multi-purpose diaphragm box). Pressure is introduced into the two chambers respectively. The sensor produces displacement (or displacement trend) under the combined action of the two pressures. This displacement is proportional to the pressure difference (differential pressure) between the two chambers. This displacement is converted into a standard signal output that can reflect the size of the differential pressure.
In actual construction, there are many kinds of sensitive element structures, chamber forms, displacement conversion methods, and standard signal formats.
1. Pressure sensing element: Differential pressure transmitters usually use piezoresistive sensors, piezoelectric sensors or pressure diaphragms as pressure sensing elements. These elements can convert pressure changes into electrical signals.
2. Pressure transmission pipeline: The differential pressure transmitter contacts the fluid through two pressure transmission pipelines connected to the fluid pipeline. Sensing the pressure difference in the fluid. Parameters such as the length and inner diameter of the transmission pipeline will affect the measurement accuracy and dynamic response of the differential pressure transmitter.
3. Transmission unit: The transmission unit is responsible for receiving the signal of the pressure sensing element and amplifying, linearizing and converting it. It can convert electrical signals into standard current signals (such as 4-20mA) or standard voltage signals (such as 0-10V). So as to transmit them to the control system or display device.
Differential Pressure Transmitter Installation
The installation position of the differential pressure transmitter on the process pipeline is related to the measured medium. In order to obtain a better installation effect, the following situations should be considered:
① Prevent the differential pressure transmitter from direct contact with the corrosive or overheated measured medium;
② Prevent slag from depositing and clogging in the pressure pipe;
③ The length of the pressure pipe on both sides of the differential pressure transmitter should be as similar as possible;
④ The liquid column pressure head in the pressure pipe on both sides of the differential pressure transmitter should be balanced;
⑤ The pressure pipe is installed in a place with the smallest temperature gradient and temperature fluctuation.
1. When measuring liquid flow, the differential pressure transmitter should be installed beside or below the measured pipe so that bubbles can be discharged into the pipe;
2. When measuring gas flow, the differential pressure transmitter should be installed beside or above the measured pipe so that the accumulated liquid can easily flow into the pipe;
3. When measuring steam flow, the differential pressure transmitter should be installed below the measured pipe so that condensed water can fill the pressure pipe.
Special attention should be paid. When measuring steam or other high-temperature media, prevent the temperature of the differential pressure transmitter from contacting the medium exceeding the limit temperature of the transmitter.
