5Troubleshooting Guide

Malfunction or incorrect operation may be caused by:

1.Reversed polarity:

Check the wiring using Figure 3-5 as a guide. If the temperature of the thermocouple increases while the current magnitude decreases, the problem could caused by reversed polarity of the:

a)thermocouple wiring

b)power supply leads

c)monitor instrument

2.Loose or broken wires:

Check each terminal connection for tightness. Move each wire back and forth and note any changes in operation.

3.Too high a load resistance in the output current loop or too low

a current rating on the power supply:

24

Page 29
Image 29
Omega TX91 manual Troubleshooting Guide, Current rating on the power supply