Description
Fluke 5609 Secondary Reference PRT Probe Repair
The Fluke 5609 is a secondary reference platinum resistance thermometer – a probe used as the temperature standard other sensors are measured against. Its accuracy is the entire product, and it has no display of its own to warn you when it has drifted.
Is your Fluke 5609 worth repairing?
Reference probes are consumable in a way instruments are not – thermal cycling and shock move them. Recalibration restores traceability; physical damage generally does not. Our answer for the Fluke 5609: Recalibrate rather than replace where the element is sound – we tell you plainly when it is not. We evaluate free of charge and quote before any work begins, and if the numbers do not favour repair we say so rather than quoting anyway.
What typically fails on the Fluke 5609
- Sheath damage or contamination.
- Insulation resistance breakdown at high temperature.
- Lead wire or connector faults.
- Element damage from thermal shock.
- Immersion depth markings worn.
- Drifted outside specification – invisible without a reference, since the probe has no readout.
What you get back
Component-level repair rather than assembly swapping, NIST-traceable calibration with the measured results documented, and a 90-day parts-and-labor warranty. Most instruments are back with you inside 5-10 business days.
Fluke Service Center works on Fluke instruments only. Send it in for a free evaluation, or email us with the model and the symptom and we will tell you what to expect before you ship anything.






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