Electrical System
11-12
Part 1079832_04
E 2015 Nordson Corporation
Checking an RTD
NOTE: You will need to know the temperature of the RTD to properly
perform this check.
1. Disconnect and lock out electrical power to the system.
2. Disconnect the cordset that supplies power to the RTD to be checked.
3. See Figure 11‐8, 11‐9, or 11‐10 as appropriate. With the RTD at a known
temperature, use an ohmmeter to measure the RTD resistance at the
RTD pins on the cordset.
4. See Figure 11‐11 (nickel RTDs) or 11‐12 (platinum RTDs) as appropriate
to determine the correct resistance of the RTD based on its temperature:
S If the measured resistance is correct, the RTD is operating properly.
Return to the procedure that referenced this check.
S If the measured resistance indicates an open circuit, continue to the
next step.
5. Remove the appropriate manifold cover and check for loose RTD wires or
wire connections. Tighten any loose connections.
6. Check the RTD resistance again. If the resistance is normal, the RTD is
now operating properly. If it is not, continue to the next step.
7. Disconnect the RTD wires, measure the resistance across them, and
compare the results to Figure 11‐12:
S If the measured resistance is within the appropriate range, reconnect
the RTD wires, reinstall the manifold cover, and return to the
procedure that referenced this check.
S If the measured resistance is not within the appropriate range, replace
the cordset. Refer to Replacing a Cordset later in this section.
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