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5 Troubleshooting Guide
a) Measure the total resistance of each device (excluding the
transmitter and power supply) in the 20 mA loop, including the
resistance of the lead wires.
b) Calculate the maximum allowable loop resistance using the
formula:
Loop Resistance (maximum) = V
supply
-11V
0.020A
For example, a 24V power supply would give a maximum loop
resistance of: 13V/0.020A = 650 ohms.
c) Make sure the power supply is rated for at least 28 mAtimes the
number of TX91 transmitters being powered. For example, if the
supply is powering 5 transmitters, the supply should be rated for
at least 140 mA.