Pressure transmitters and differential pressure transmitters, as measuring instruments, are mainly used to measure the pressure differences of media such as gases and liquids.
How to choose? One should take into account the differences between the two in terms of structure, working principle, application scope and other aspects.
Working principle
1. Pressure transmitter: It senses pressure through probes such as piezoresistive sensors, vibration sensors or semiconductor strain gauges, and then converts the pressure signal into a current or voltage signal for output. Remote measurement and control of pressure can be achieved by using pressure transmitters.
2. Differential pressure transmitter: It senses the pressure of the medium through two pressure sensing ports respectively, and then converts the pressure difference into a standard electrical signal output through the sensor. A differential pressure transmitter typically consists of two pressure sensing ports, a fluid probe and a pressure sensor.
Structure and Characteristics
1. Pressure transmitter: It is usually composed of pressure-sensing elements, conversion circuits, output circuits, instantaneous stabilization circuits, temperature compensation circuits, overload protection circuits, etc. It features a simple structure, small size, light weight, fast response speed and high precision, and is suitable for a wide range of industrial applications.
2. Differential pressure transmitter: It includes the front edge assembly, rear edge assembly, sensor and output circuit, etc. The differential pressure transmitter features a small size, compact structure, strong resistance to temperature changes, and high reliability. It is suitable for differential pressure measurement of flow rate, water level, filter clogging degree, etc.
Measurement range and accuracy
1. Pressure transmitter: The measurement accuracy of pressure transmitters can generally reach 0.1%. It is widely used for measuring media with pressure variations ranging from absolute pressure to over-range, and can cover most industrial applications.
2. Differential pressure transmitter: The measurement range of a differential pressure transmitter is generally from a slight differential pressure to a relatively large differential pressure range, and the measurement accuracy can reach 0.2%. It is mainly used to measure the flow rate, liquid level and other differential pressure changes of gases and liquids.
Application
1. Pressure transmitter: Pressure transmitters are widely used in process control and process measurement in industries such as petroleum, chemical engineering, metallurgy, power, and water treatment. It is suitable for measuring the absolute pressure, relative pressure and differential pressure of liquids or gases, and can transmit the measurement signals to display instruments, PLCS, DCS and other systems to achieve remote monitoring and automatic control.
2. Differential pressure transmitter: The differential pressure transmitter is mainly used for differential pressure measurement of flow rate, water level, blockage degree, etc. It is widely applied in industrial fields such as chemical engineering, water pumps, air conditioning, ventilation, and liquid level control, providing accurate differential pressure measurement data for process control.
Pressure transmitters are widely used in pressure measurement and control, while differential pressure transmitters are mainly used for differential pressure measurement and control of flow, water level and other aspects.
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