Pressure transmitter model and parameters

The working principle of a pressure transmitter is based on the piezoresistive effect, which means that when an external force acts on a sensitive element (such as a metal film, semiconductor crystal, etc.), the resistance value of the sensitive element changes, and then an electrical signal is generated for export. Different usage scenarios require different types and parameters of pressure transmitters. This article will introduce the models and parameters of pressure transmitters.

1、 Model representation

1. A pressure transmitter must be used

Positive pressure transmitter refers to a pressure transmitter that measures pressure with a positive vacuum as the zero point. Positive pressure transmitters are generally used for pressure measurement in high-altitude, vacuum, and other applications.

2. Differential pressure transmitter

A differential pressure transmitter is a type of pressure transmitter used to measure the difference between two pressures. Differential pressure transmitters are usually used to measure flow, liquid level, etc.

3. Absolute differential pressure transmitter

Absolute pressure transmitter refers to a pressure transmitter that simultaneously measures absolute pressure difference. It can measure two pressures simultaneously and is widely used for measuring liquid level, flow rate, pressure difference, etc.

4. Absolute differential pressure flowmeter

Absolute pressure difference flowmeter is a special type of pressure transmitter that can calculate flow rate by measuring the pressure difference of the fluid. Absolute pressure differential flow meters are generally used for liquid and gas flow measurement.

2、 Basic parameters

1. Range measurement range refers to the pressure range that can be detected by the pressure transmitter. Different types and models of pressure transmitters have different ranges. When selecting a pressure transmitter, the appropriate range should be selected based on the range of measured pressure.

2. Precision refers to the deviation between the output signal of the pressure transmitter and the actual pressure. Pressure transmitters of different types and models have different accuracy categories. When selecting a pressure transmitter, the appropriate accuracy level should be selected based on the accuracy level of the measured pressure.

3. Output signal

Output signal refers to the type and category of electrical signal output by a pressure transmitter. Common output signal types include 4-20mA current signal, 0-10V voltage signal, RS485 analog signal, etc. When selecting a pressure transmitter, the appropriate output signal type and category should be selected according to the regulations of the control system.

4. Working temperature

Working temperature refers to the operating temperature range within which a pressure transmitter can operate normally. Different types and models of pressure transmitters have different operating temperature ranges. When selecting a pressure transmitter, the appropriate model should be selected based on the ambient temperature of the usage scenario.

5. Protection level

Protection level refers to the ability of the pressure transmitter casing to protect aggressive solids and liquids. Pressure transmitters of different types and models have different protection levels. When selecting a pressure transmitter, the appropriate protection level should be selected according to the needs of the usage scenario.