Robertshaw 10-038 Thermocouple Test Adapter — HVAC Diagnostic Tool
The Robertshaw 10-038 is a professional thermocouple and thermopile test adapter designed for accurate closed-circuit millivolt testing. HVAC technicians use this tool to diagnose pilot-safety systems, gas appliances, and standing-pilot ignition systems without removing the thermocouple from the circuit.
This adapter allows a standard millivolt meter to measure live-load output from Type K thermocouples through a 1/4-inch NPT connection, providing fast and reliable performance checks.
Why Use the 10-038
Confirms thermocouple output under operating conditions
Helps identify faulty thermocouples before replacing them
Saves time on service calls and gas equipment diagnostics
Compatible Equipment
Use for testing thermocouples in:
Furnaces & boilers
Water heaters
Commercial kitchen gas equipment
Fireplaces & space heaters
Pilot-safety and millivolt control systems
Technical Specs
|
Specification |
Details |
|---|---|
|
Model |
Robertshaw 10-038 |
|
Function |
Closed-circuit thermocouple test adapter |
|
Thermocouple Type |
Type K |
|
Connection Size |
1/4-inch NPT |
|
Meter Required |
Standard millivolt meter |
How do you test a thermocouple with a meter?
The 10-038 makes it easy — simply install the adapter inline, connect your meter leads, and check mV output under load per the appliance manufacturer’s specs.
Q & A: Ask the Questions, share answers
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Hi there,
Thanks for reaching out. The Robertshaw 10-038 is a closed-circuit thermocouple test adapter. It allows you to connect a millivolt meter in-line with a thermocouple so you can measure the thermocouple’s output under load (while still connected to the gas valve).
The adapter installs in line between the thermocouple and the gas valve
This allows the appliance to operate normally while voltage is read
One side threads into the gas valve’s thermocouple port
The thermocouple threads into the other side of the adapter
The spade/terminal tab is where you attach one meter lead
The other meter lead typically goes to system ground/valve body, as the thermocouple circuit returns through the appliance.
This tool allows technicians to verify thermocouple or thermopile output under operating conditions before replacing components.
This guidance is provided for informational purposes only. Gas appliance testing and repair should only be performed by qualified HVAC or gas-service technicians in accordance with manufacturer instructions and local codes. If you are unsure how to use this tool safely, please contact a licensed professional or refer to the appliance manufacturer’s official service documentation.
$ USD
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