Troubleshooting
6-10
Part 237478_03
E 2012 Nordson Corporation
RTD Check
This procedure is provided to help reduce the unnecessary replacement of
parts. The resistance chart in Figure 6‐2 is based on the active temperature
of the RTD. The RTD should be at a known temperature to effectively use
the chart. The Nordson hose/gun diagnostic device allows you to
troubleshoot without removing a gun from the hose. Refer to Section 8, Parts
for the correct number.
1. Disable the gun's triggering device.
2. Unplug the gun's cordset from the hose plug receptacle.
3. Allow the gun to reach room temperature.
4. See Figure 6‐5. Connect a standard ohmmeter to the RTD pins on the
cordset plug.
5. Note the resistance value, then compare that value to the resistance
value that corresponds to the known temperature of the gun on the chart
in Figure 6‐2.
S Match between measured resistance value and chart value: normal
indication (RTD probably not defective). Return to the
Troubleshooting Guide.
S No match between measured resistance value and chart value: RTD
defective. Replace RTD (refer to Section 7, Repair).