Duke HDC6-37.5-240 Service Manual - Page 13

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RTD

Check the RTD Thermocouple by measuring

the resistance between the two lead wires.

There are two RTD probes in each Foil Wrap. To

access the RTD, follow the procedure described

in the CHANNEL ASSEMBLY paragraph in

COMPONENT REPLACEMENT section.

1. Disconnect the RTD wires.

1000 Ohms

Figure 15. Foil Wrap with RTD Connectors

Service Manual for Dry Channel HDC3/HDC6 Units

2. Connect an ohmmeter across the RTD leads

and verify that the resistance is approximately

1000Ω at ambient room temperature.

3. Check both RTDs in the Channel Assembly.

4. Replace the Dry Channel Assembly if an RTD

is defective.

Refer to the Wiring Diagram.

1000 Ohms