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I want to know for Span Setting of Temp Transmitter connect to RTD.
Let's say we have 3 Temp Transmitter with different span:
1) 0-160 degC
2) 0-250 degC
3) 0-400 degC
As I know, setting zero-span for 4-20mA analog transmitter will effect operating temperature shall working within that range.
But, let's say I received current 8mA from above transmitters installed on the same process line. For 3 different span will give different temperature (degC) in the DCS.
Which one is correct? And how to understand the calculation?
Let's say we have 3 Temp Transmitter with different span:
1) 0-160 degC
2) 0-250 degC
3) 0-400 degC
As I know, setting zero-span for 4-20mA analog transmitter will effect operating temperature shall working within that range.
But, let's say I received current 8mA from above transmitters installed on the same process line. For 3 different span will give different temperature (degC) in the DCS.
Which one is correct? And how to understand the calculation?