I.          PURPOSE:

                    To provide a procedure for operation and calibration of  the BLS make Freezer.

 II.        SCOPE:

                   This procedure is applicable for the BLS make CIC-71  Freezer being used for  

                   storage of standard materials and samples in the Quality Control department    

III.       RESPONSIBILITY:

                   It is the responsibility of all the personnel involved in the analysis using of the equipment.           

 IV.       DOCUMENT REFERENCE:

            SOPs   :           None

            Forms :           None

 V.        OPERATION:      

1.0       Daily monitoring:

1.1     Check that the instrument and surroundings and clean with a soft cloth duster.

1.1.1Record the temperature daily once between 9.00 to 11.00 am

1.1.2The temperature should be between -20⁰C and –10⁰C.

1.1.3If the temperature out of range inform to the service personnel.

2.0 BASIC OPERATION:

2.1   Before using the Freezer apparatus, check whether it is calibrated or not.If not, call the service personnel for calibration.

1.    Switch on the instrument by the “MAINS” switch on the control panel of the instrument.
2.   The control panel consists of

1. Microprocessor based Temperature controller.
2. Ampere meter.
3. Volt meter.
4. Fuse.
   1. To set the desired temperature press set key on Microprocessor based Temperature controller until SP is displayed.
   2.    Press enter.
   3.   After the desired temperature is set keep the sample in the oven and close the door.
   4.    Precautions

1. If ampere meter draws more than 3 Ampere then switch “off” the incubator and clean the condenser with air –blower and restart.
2. If Volt meter drops less than 180 or exceeds more than 250 Volts than switch off the incubator and restart by using new stabilizer of 4 KVA capacity.

 VI. CALIBRATION      Calibration Frequency: Once in six months by external agency.

1. The calibration should be carried out by external across the full range of temperature i.e  from -20⁰C to 0⁰C by using methods and standards traceable to national standards.
2. If the instrument fails in calibration, proceed as per the Core Procedure, “Calibration of  Equipment”.

Calibration, surroundings, microprocessor, external agency