People who work with thermocouples a lot may also not know exactly how the cold junction of thermocouple (reference) works. To be able to discuss the cold junction, we first need a brief understanding of thermocouple theory and how thermocouples work.

In the general sense, the pressure transmitter is mainly composed of three parts: sensor sensor (also known as pressure sensor), measurement circuit and process connector. It can transform the physical pressure parameters that the pressure measuring component sensor feels into a standard electrical signal (such as 4 ~ 20madc, etc.) to supply the alarm, recorder, regulator and other second instruments such as the alarm, recorder, regulator and other second instruments.

NCS-PT105Ⅱ series Smart Pressure Transmitter supports HART, FF, and PA protocol and can measure pressure, differential pressure, liquid level, flow, and other industrial parameters. It can be widely used in the petroleum, chemicals, electricity, and metallurgical industries, etc..

Precautions for installing pressure transmitter

How is the pressure transmitter connected to the measured medium?​​

Phenomenal expression The starting drift of a pressure transmitter refers to the phenomenon that its output signal deviates from the initial set value during the equipment startup phase. This deviation is usually more obvious in a short period of time after startup, and may appear as a rapid rise or fall in the output value, and then gradually stabilize. For example, in some petrochemical plants, when the pressure transmitter is started, its output value may fluctuate greatly within a few minutes, which is far from the actual pressure value.

The pressure transmitters of Microcyber have already obtained the explosion-proof and intrinsically safe way of explosion-proof certification, of which the explosion-proof certification has taken the Ex d IIC T4/T6 Gb certification requirements, and can be widely used in a variety of industrial sites as well as the explosion-proof requirements of the occasion.

The smart instrument with new generation fieldbus technology is an indispensable field device in process control, supporting mainstream industrial bus protocols such as HART, Foundation Fieldbus, PROFIBUS PA, PROFIBUS DP, etc. It can be used for the acquisition and control of temperature, pressure, current and other signals at industrial sites, and is suitable for various industrial control environments.

The research on pressure transmitter mainly focuses on the following aspects: ① Pressure transmitter communication methods. ② Pressure sensors in high temperature extreme environments. ③ Pressure transmitter with self-diagnosis function. ④ Pressure transmitter temperature compensation method. ⑤ Pressure transmitter other aspects of the research progress.

Pressure transmitters are mainly categorized into adiabatic pressure transmitters, gauge pressure transmitters and differential pressure transmitters.