Answer / carl_ellis

Any 2 wire, loop powered 4-20mA transmitter that puts out
30mA is broken. The only transmitter that puts out 30mA is
a legacy 10-50mA transmitter from 20-30 years ago.

While the upper end of the 4-20mA signal range is 20.0mA,
most 2 wire, loop powered transmitters allow for some slight
signal over-range, typically 20.5mA.

NAMUR standards use 21.0 mA to signal a fault or failure
mode. Other vendors use other values, 20.8mA, 21.2mA or
some value in the range of 21mA. But no vendor uses 30mA
as a fault mode.

The transmitter is broken or dysfunctional.

Carl Ellis
Measure First

Dear sir I am MD.zafar eqbal. I have taken this id from allinterwiev .com I have qustion if you dont mind. 1.what is the maximum operating temprature in instrumentation. 2. I want know about viberation i mean wahat types of sensor used in viberation And what types of trabsmitter used.and hiw to control it and wher is used of viberation transmitter and finally how to control it and what types of fault come. Sorry for disturbing you. I know you have no reason for help me. Because you dont know about me.but i request you please help me these question are very usefull for my feauture.plz sir Thanking you. Sent from Yahoo! Mail on Android

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