F0109AE-B FOXBORO IO module

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F0109AE-B  FOXBORO IO module In Stock

Three and four wire RTDs are compensated up to 40 Ω for each lead. This is approximately equal 

to 1220 m (4000 ft) of 20 gauge wire. The total resistance including the RTD and the two lead 

wires is:

Therefore, if a platinum RTD is used to measure a maximum temperature of 1292 °F (700 °C), 

the RTD resistance is 345 Ω and the maximum permissible lead wire resistance (for both leads 

combined) is:

You may calculate the maximum permissible lead wire resistance for other RTD applications in a 

similar manner.

For a single 2-wire RTD, the extension leads are in series with the sensing portion of the RTD, so 

lead length should be minimized. If the distance between the transmitter and sensor is “long”, 

change the RTD to a 3- or 4-wire RTD.

The “lead length” errors associated with two-wire RTDs are:

♦ Positive offset due to lead wire resistance

♦ Change in lead wire resistance due to ambient temperature changes is added to or 

subtracted from the sensor reading

Product details:

F0109AE-B  FOXBORO IO module

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