Hot air oven operation and calibration SOP

 1.0 OBJECTIVE :

To provide a procedure for Operation and Calibration of Hot Air Oven.

2.0 SCOPE :

This procedure is applicable to Expo-Hi Tech Hot Air Oven.

3.0 RESPONSIBILITY :

Quality control Chemist and above

4.0 ACCOUNTABILITY:

Quality Control Head

5.0 PROCEDURE :

Hot air oven are electrical device which use for drying. An air circulating fan helps for uniform distribution of the heat in oven.

5.1 OPERATION

Switch “ON” the main supply.

Electronic temperature controller displays the chamber temperature.

Set the required temperature by pushing the “SET” switch and first knob (COARSE) clockwise or anticlockwise until the temperature comes near to set one.

Set the temperature with the help of second knob (FINE).

Release the push switch.

Indicator bulb glows indicates that the power to the heater is ‘ON’.

Switch ‘ON’ the FAN switch for air circulation.

Use rotary switch for precise control of temperature.

Four position of rotary switch is available as follows,

0 – off position

1 – 5°C above ambient to 90°C

2 – 90°C to 150°C

3 – 150°C to 250°C

Keep the switch on suitable marking as per requirement of temperature.

5.2 CALIBRATION

For the calibration of hot air oven use two standard thermometer (range: 0°C to 250°C).

Set the oven at a temperature 20°C as per operation procedure.

Put the Calibrated thermometer for 30 minutes in upper shelf and lower shelf of oven and close the door of oven.

After 30 minutes open the door of oven and carefully read the temperature on Calibrated thermometers randomly.

Record the observed temperature in format- Calibration of hot air oven (Annexure No. 01).

Again Set the oven at a temperature 30°C as per operation procedure.

Repeat the above procedure with 100°C and again record the observed temperature in calibration record of hot air oven as per annexure attached.

ACCEPTANCE CRITERIA: The observed temperature of thermometer in both shelves as given the record

FREQUENCY : Quarterly

6.0 ABBREVIATIONS:

Abbreviation Expanded form

°C Degree Celsius

min. Minutes

7.0 ANNEXURES:

Annex. No.               Title

01 Calibration of Hot Air Oven