Description
Fluke 6109A Calibration Bath Repair
The Fluke 6109A (Hart Scientific) is a portable calibration bath — a stirred liquid bath that holds a fluid at a uniform, stable temperature for immersion calibration of temperature sensors, sized for field and lab use. Its precision depends on the heating/cooling system, the stirrer/circulation, the temperature control and reference sensor, and the bath tank, which is where service and calibration focus.
FlukeServiceCenter.com repairs and calibrates the Fluke 6109A for calibration laboratories, pharmaceutical process engineers, and metrology facilities.
Common Fluke 6109A problems we fix
- Heating / circulation faults — won’t reach the setpoint or circulate evenly, repaired.
- Stirrer / pump wear — poor circulation causing gradients, the stirrer/pump rebuilt.
- Tank / seal faults — leaks or seal degradation, repaired.
- Temperature-controller drift — the controller or reference sensor reading the wrong setpoint, recalibrated against standards.
- Display, interface, or power faults.
FAQs
My 6109A won’t reach or hold temperature — fixable? Yes. Heating/cooling, circulation, and control faults are repairable, then it’s recalibrated so bath temperature is accurate, stable, and uniform, with a NIST-traceable certificate.
Is stability verified? Yes — stability and uniformity 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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