Description
Isotech Calisto 4953 Temperature Calibrator Repair
The Isotech Calisto 4953 Temperature Calibrator is a temperature calibration source. Whether it heats a metal block or stirs a liquid, the specification that matters is not whether it reaches a setpoint but how uniformly and how stably it holds one, because that is what the probes under test actually see.
June Company repairs and calibrates the Isotech Calisto 4953 Temperature Calibrator for calibration laboratories, instrument technicians, and process metrology teams. Every instrument is repaired at component level and verified against reference standards before it ships back, with the measured results documented.
Common Isotech Calisto 4953 Temperature Calibrator problems we fix
- Heater element failure or slow heating.
- Will not reach low setpoints.
- Control loop unstable or overshooting.
- Stirrer or circulation faults on liquid baths.
- Well, insert or probe port damage.
- Display, keypad or front-panel faults.
- GPIB, LAN, USB or remote-control faults – which breaks automated test sequences while the instrument still works from the front panel.
- Stability or uniformity outside specification – a source at the right average temperature can still vary enough across the well to move a reading, and nothing on the display reveals it.
FAQs
Are the measurements verified after repair? Yes, against reference standards, with the measured results documented and returned with the instrument.
It reaches setpoint but my readings still disagree. What is wrong? Usually uniformity rather than setpoint. The source can be at temperature on average while varying enough across the well to move a reading.
Every repair carries a 90-day parts-and-labor warranty, with a firm quote before any work begins. Email us or submit a service request.







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