Signal Conditioner

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What is the difference between 2-wire transmitter, 3-wire transmitter and 4-wire transmitter?

 2-wire transmitter

 3-wire transmitter

 4-wire transmitter

Four-wire transmitters have their own internal power supply, and they do not need to be connected to a DC power supply. It has two power cords and two current output lines. The output of a 4-wire transmitter is usually a current signal.

FAQ of Signal Isolators

How to distinguish between the active and passive signals?

According to whether the signal acquisition loop needs an external power supply,

Active signal：In the 4~20mA signal acquisition loop, the signal generating end has its own voltage drive and no external power supply equipment is needed. This 4~20mA is an active signal. Generally, 4-wire transmitter and 3-wire transmitter output active signals.

Passive signal：In the 4~20mA signal acquisition loop, the signal generating end does not have its own voltage drive and external power supply equipment is needed. This 4~20mA is a passive signal. Generally, a 2 wire temperature transmitter outputs passive signals.

Method of judging whether the external power supply is needed in the signal acquisition loop：

Disconnect the signal acquisition loop, and connect a voltmeter to the two lines of the field device (voltage transmitter). If there is voltage, it means the field device outputs active signals. If there is no voltage, it means the field device outputs passive signals.

Temperature Input Signal Type and Range

Country: China (Mainland)
Business Type: Manufacturer
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Founded Year:2002
Address:8F, Bldg.6, No. 201, Minyi Road, Songjiang Dis, Shanghai, China
Contact:CHEN ZHU

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Signal Conditioner

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