Wire Length for analog input in DAQ

[adith123]

What is the maximum length of the wire that can be used to connect the sensor output (4-20ma) to my USB-DAQ(not sure of the model) . This is important. Will the wire resistance affect the accuracy of the measurement in any way ?

[AnalogKid2DigitalMan]

It can be up to miles, depending on numerous factors:

-Need to know what the maximum loop resistance the transmitter can handle

-Wire gauge and expected ambient temperature (this affects loop resistance)

-Voltage supplied to the transmitter

-Input resistance of DAQ card

Can you supply some numbers for the above?

Generally, 4-20mA loops are immune to noise, but it is suggested to use shielded cable.

-AK2DM

[adith123]

-Need to know what the maximum loop resistance the transmitter can handle ( N/A)

-Wire gauge and expected ambient temperature (this affects loop resistance) (High Humidity , around 30 C )

-Voltage supplied to the transmitter ( Its an Electromagnetic Flow sensor, i guess it shud be maximum around 20VDC not more)

-Input resistance of DAQ card Can you supply some numbers for the above? ( not sure of this)

Generally, 4-20mA loops are immune to noise, but it is suggested to use shielded cable. ( I just need to use atleast 6 meters around 10ft of a single strand copper wire Shielded ) 

Thanks in advance 

"THERE IS NO SPOON "

[AnalogKid2DigitalMan · Accepted solution]

adith123:

6 meters (~20 feet) will be just fine.

"Follow the white rabbit" 🙂

-AK2DM

[adith123]

Thanks a lot 🙂 esp from a fellow fan 😉

"What is Real ? How do you Define real ?"