RTD and thermocouple calibration for process, pharma and laboratory sensors
Comparison calibration of Pt100 RTDs, thermocouples and sensor-plus-indicator loops, with traceable certificates for audits and process control.
What RTD and thermocouple calibration covers
Temperature sensors drift. Thermocouples age through oxidation and contamination of the wires, and RTDs shift after mechanical shock, vibration or overheating. Because the reading still looks plausible, drift is rarely noticed until a product, sterilisation cycle or test fails. Regular RTD and thermocouple calibration exposes it.
We calibrate the sensor alone, or the sensor together with its indicator, transmitter or controller as a loop. Loop calibration shows the total error the operator actually sees on the display, which is often what an auditor wants to review.
Sensor work is part of our wider temperature calibration service, alongside temperature indicator and controller calibration.
Why temperature sensor calibration matters
Process control
Ovens, autoclaves, reactors and cold rooms are controlled by these sensors. A small error moves the whole process.
Validation data
Sensors used for autoclave validation and temperature mapping must be calibrated before and after the study.
Traceability
GMP, ISO/IEC 17025 and food safety audits expect each critical sensor to have a traceable certificate.
Sensors covered by RTD calibration and thermocouple calibration
- Pt100 and Pt1000 RTDs, 2, 3 and 4 wire
- Type K, J, T, N and other thermocouples
- Mineral insulated and sheathed probes
- Sensor with digital indicator or controller (loop)
- Temperature transmitters with 4 to 20 mA output
- Data logger probes used for validation
- Thermometer probes for labs and cold chain
- Ice point and multi-point checks as required
Industries using RTD and thermocouple calibration
How RTD and thermocouple calibration is done
Calibration is by comparison. The sensor under test and a calibrated reference probe are inserted together into a stirred liquid bath or a dry block calibrator. At each test point the system is allowed to stabilise, then several readings are taken from both and averaged.
Test points are chosen to cover the range you actually use, for example a low, mid and high point, or the specific set points of a process. For thermocouples, the reference junction compensation of the readout is part of the measurement, so the instrument used in service matters.
Immersion depth, stabilisation time and stem conduction all affect results, so short or bent probes need a suitable setup. The report records the conditions used along with errors and measurement uncertainty.
How often should temperature sensors be calibrated?
Most sites calibrate critical RTDs and thermocouples every six to twelve months. Thermocouples used at high temperatures, or in harsh atmospheres, often need shorter intervals or replacement, because their error can change with use and cannot always be corrected.
Validation probes are typically checked before and after each study. Any sensor that has been dropped, overheated or replaced should be calibrated before it goes back into use.
A sensor register with tag numbers, ranges and due dates makes RTD and thermocouple calibration easier to plan across a plant or hospital.
Keep each certificate with the equipment record, enter the next due date in your maintenance schedule and show both to auditors when asked. We keep a record of due dates for every client and can send a reminder before the next visit is needed, so nothing slips out of calibration between audits.
Calibration records and NABL scope
Each certificate identifies the sensor, its readout if calibrated as a loop, the test points, reference readings, errors and measurement uncertainty, with traceability to national standards. RTD and thermocouple calibration is performed within the laboratory's NABL scope where applicable; ask us for the current scope for your temperature range.
Sensors can be sent to our Salem laboratory or calibrated at your site where portable reference equipment is suitable. See our onsite calibration services.
How the work is carried out
Sensor list
Share sensor types, tag numbers, ranges and whether a readout is included.
Setup
Sensors are placed with a reference probe in a bath or dry block.
Comparison
Readings are taken at each test point after stabilisation.
Report
Certificates with errors, uncertainty and traceability are issued.
One accountable team, documented results
NABL-Accredited
Calibration and testing carried out under NABL accreditation and ISO/IEC 17025:2017-compliant procedures.
On-Site & Laboratory Capability
Work carried out at your facility or in our laboratory, by one accountable team.
Serving Since 2022
Serving hospitals, laboratories, pharmaceutical and industrial clients across Tamil Nadu since 2022.
Explore related services
Frequently asked questions
Plan RTD and thermocouple calibration
Send your sensor list with ranges and tag numbers and we will suggest lab or on-site calibration.