SOP for Calibration of Temperature Gauge

PURPOSE

To define the procedure for calibration of the Temperature Gauge.

SCOPE

Range -80 to 110°C at Lab.

RESPONSIBILITY

Calibration Engineer

MASTER EQUIPMENT USED

Standard PRT sensor, Digital Thermometer Readout (chub-4), Liquid Temperature Bath, Dry Block

ENVIRONMENTAL CONDITION 

Temperature - (25 ± 3)°C

Humidity - (50± 10) % RH

PROCEDURE

• The temperature Gauge is visually checked for no any physical damage.
• The temperature Gauge under calibration is attached an under-calibration tag. The type, Range, S.No, Make & other details of the temperature gauge are recorded in the observation Sheet.
• Switch on the Liquid Temperature Bath OR Dry Block for the temperature source and set it at the desired range for the calibration Point of the Temperature Gauge.
• PRT and Temperature Gauge under calibration are put into the Liquid Temperature Bath.
• Record Temperature during calibration in the Observation Data Sheet.

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• Ensure all the connectivity of the reference sensor with digital thermometer readout is correct.
• Allow sufficient time to stabilize of equilibrium temperature at the set value and ensure before taking the measurement of the PRT as well as the Temperature Gauge under calibration.
• Wait for 15 to 20 minutes at the set temperature so that the dry block stabilizes at the set temperature.
• On Stabilization, the set temperature of PRT &Temperature Gauge under calibration has recorded the temperature on the observation sheet.

• Five measurements are observed and record the temperature for each calibration set point repeat the above step for other temperature set points and cover the range as per customer request.
• After Calibration the Temperature Gauge is not to be removed immediately, allowing sufficient time to cool until the ambient temperature is reached.
• Calculate the measurement uncertainty by taking 5 repeated readings at the same Measurement point.
• Affix the calibration sticker on the Temperature Gauge.
• Prepare the Calibration certificate.

ANNEXURE

1. Calibration data Observation Sheet.

2. Uncertainty Evaluation Record sheet.

3. Copy of Calibration Certificate.

REVISION HISTORY

Nil

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