Description
Fluke 9118A Thermocouple Furnace Repair
The Fluke 9118A (Hart Scientific) is a thermocouple calibration furnace — a horizontal tube furnace that heats to high temperatures with good uniformity to calibrate thermocouples. Its precision depends on the heating system, the temperature control and reference sensor, and the furnace insert, which is where service and calibration focus.
FlukeMeterRepair.com repairs and calibrates the Fluke 9118A for calibration labs and metrology teams.
Common Fluke 9118A problems we fix
- Output-accuracy / heating faults — won’t reach the setpoint or temperature is inaccurate, the heating system repaired and recalibrated against standards.
- Temperature-controller drift — the controller or reference sensor reading the wrong setpoint, recalibrated.
- Stability faults — temperature not holding stable, the control loop corrected.
- Insert / well faults — a worn or damaged furnace insert, addressed.
- Display, interface, or power faults.
FAQs
My 9118A won’t reach or hold temperature — fixable? Yes. Heating and control faults are repairable, then it’s recalibrated so the furnace temperature is accurate and stable, with a NIST-traceable certificate.
Is stability verified? Yes — temperature and stability are verified against our standards.
Every repair includes NIST-traceable calibration and a 90-day parts-and-labor warranty. Email us or request service.




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