Control Valve Input
Control Valve Input
(OP)
Hi!
Simple question for you guys but one which I am not too sure of and need you help....
For example a control valve with 4-20mA input, and a load resistance of 300ohm, how do we use the 300 ohm load resistance information...
It must be for selection of controllers but I am not too sure how to use this info.
Hope my question makes sense to you.
Simple question for you guys but one which I am not too sure of and need you help....
For example a control valve with 4-20mA input, and a load resistance of 300ohm, how do we use the 300 ohm load resistance information...
It must be for selection of controllers but I am not too sure how to use this info.
Hope my question makes sense to you.





RE: Control Valve Input
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Sometimes I wake up Grumpy.
Other times I just let her sleep!
RE: Control Valve Input
With analog devices you might have needed a 4-20 mA alarm module for the high alarm, another alarm module, perhaps a summer if you needed to add two signals, include an analog meter at the transmitter and an intrinsic safety barrier. Then the loop doesn't work.