NABL Calibration

Steps Involved 

Here are the steps that are typically involved in NABL calibration for thermocouples, heating sensors and other such temperature measuring equipment:

• Selection of Accredited Laboratory: Choosing a calibration laboratory that is accredited by NABL for thermocouples & heating sensors is first and foremost. Accreditation ensures that the laboratory meets specific technical competence and quality management system requirements.

• Preparation & Transportation: Ensuring that the thermocouples or heating sensors are properly prepared for calibration is the next step in this direction. This may include cleaning, inspection, and any necessary adjustments. Packaging them securely for transportation to the calibration laboratory follows next

• Documentation: Then comes the step of providing the calibration laboratory with any relevant documentation, such as datasheets, user manuals, or specifications for the sensors being calibrated. This information will assist the laboratory in understanding the sensor’s characteristics.

• Traceability: The calibration laboratory should be having a documented process for traceability. This means that the measurements made during calibration can be linked to national or international standards. For thermocouples, this typically involves using a standard reference junction or another calibrated thermocouple.

• Calibration Process

  • Stabilization: The thermocouples or heating sensors may need time to stabilize at the calibration temperature before measurements are taken. This helps ensure accurate readings.

  • Testing Points: The sensors will be exposed to different temperature points to cover the range of operation. For thermocouples, this could involve a range of temperatures representative of their typical use.

  • Measurement & Recording: The laboratory makes precise measurements of the sensors’ output at each test point. These measurements are recorded along with their associated uncertainties.

• Data Analysis & Calculation: The calibration laboratory analyses the collected data to determine the calibration coefficients or corrections required for the sensors.

• Calibration Certificate: Upon successful calibration, the laboratory issues a calibration certificate. This certificate includes details like the sensor’s identification, calibration points, uncertainties, and other relevant information.

• Post-Calibration Actions: After receiving the calibrated sensors, it is essential to update the records to reflect the new calibration values. This ensures that the company is using accurate data in the processes.

Regular Recalibration: Keeping track of the calibration expiration dates for the sensors holds importance. Periodic recalibration is necessary to ensure continued accuracy.