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technical article
Diffusion silicon pressure transmitter
2011-6-10 10:28:39

Jinhu Dongxiang Instrument Company Sales Hotline: 0517-86900920 0517-86900901 18952332920

Diffusion silicon pressure transmitter:

A pressure transmitter in the general sense is mainly composed of a load cell sensor (also called a pressure sensor), a measurement circuit and a process connection. It can convert the physical pressure parameters of gas and liquid felt by the load cell sensor into standard electrical signals (such as 4-20mADC, etc.), and provide secondary indicators such as alarm indicators, recorders, and regulators for measurement and indication. And process regulation.

basic introduction

Diffusion silicon pressure transmitters are imported ceramic sensors with international advanced technology, and are equipped with high-precision electronic components. They are assembled after strict requirements. Compared with the conventional pressure transmitters currently in use, the ATE series 308 series pressure transmitters have two significantly different technical differences: one is that the measuring element uses emerging high-precision ceramic materials; the other is that there is no intermediary liquid in the measuring element. It is completely solid. Main features of pressure transmitter

Strong anti-overload and anti-shock capabilities, over-voltage can reach several times of the range, even if the measuring element is directly hit with a hard object, it will not be damaged, and it will not affect the measurement accuracy;

High stability, better than 0.1% of full scale every year. This technical index has reached the level of intelligent pressure instruments; the temperature drift is small, because the intermediary liquid in the pressure measuring element is eliminated, the sensor not only obtains high measurement accuracy, but also Little affected by temperature gradient;

The pressure transmitter has wide applicability, convenient installation and maintenance, and can be installed in any position.

Main technical indicators of pressure transmitter

Measuring range: -100KPa ~ 60MPa

Accuracy level: 0.1 level, 0.2 level, 0.5 level

Ambient temperature: -40 ~ 80 ℃

Medium temperature: -40 ~ 125 ℃ (temperature compensation: -20 ~ 80 ℃)

Long-term stability: better than 0.1% F. S / year

Working voltage: 12.5 ~ 36VDC

Output signal: 4-20mA (two-wire system) 0 / 1-5VDC (three-wire system)

Range migration: 10: 1 migration for standard range

Impact of vibration: 200Hz / g on any axis is 0.01% F. S

Transmitter protection level: IP65

Explosion-proof: iaⅡCT4, intrinsically safe

Associated Device: LB802

Material: Housing is die-cast aluminum

Diaphragm is 96% alumina ceramic

Process connection is 316L stainless steel

Sealing ring: nitrile rubber, silicone rubber, fluorine rubber

,压力传感器的主要作用 The main role of pressure transmitters and pressure sensors

The pressure signal is transmitted to the electronic device, which displays the pressure on the computer

The principle is roughly:

Converting the mechanical signal of water pressure into an electronic signal such as electric current (4-20mA)

The relationship between pressure and voltage or current is linear, generally proportional

Therefore, the voltage or current output by the transmitter increases with increasing pressure.

This gives us a relationship between pressure and voltage or current

The two pressures of the measured medium of the pressure transmitter pass into the high and low pressure chambers . The pressure in the low pressure chamber is atmospheric pressure or vacuum , and acts on the isolation diaphragms on both sides of the delta element (that is, the sensitive element). The filling liquid in the element is transferred to both sides of the measuring diaphragm. The pressure transmitter is composed of a measuring diaphragm and electrodes on the insulating sheets on both sides. When the pressure on the two sides is inconsistent, the measurement diaphragm is displaced . The displacement is proportional to the pressure difference , so the capacitance on both sides is not the same. Through the oscillation and demodulation links, it is converted into a signal proportional to the pressure.