SOP On Cleaning, Maintenance and Calibration of Cooling Cabinet
1.0 Objective
1.1 To lay down a procedure for the cleaning, maintenance, and calibration of the Cooling Cabinet to ensure proper functioning and reliability.
2.0 Scope
2.1 This SOP is applicable to the cleaning, maintenance, and calibration of the Cooling Cabinet used in the Quality Control department.
3.0 Responsibility
3.1 QC Chemist or above
3.2 Electrician or above
4.0 Accountability
4.1 Head – Quality Control
4.2 Head – Engineering
5.0 Procedure
5.1 Cleaning
5.1.1 Only trained and skilled personnel shall perform the cleaning of the Cooling Cabinet.
5.1.2 Cleaning of the Cooling Cabinet shall be carried out once daily.
5.1.3 The PT-100 sensor shall be cleaned with polish paper once every four months.
5.1.4 The condenser shall be cleaned by blowing compressed air through it every four months.
5.1.5 Cleaning records of the Cooling Cabinet shall be maintained as per Annexure.
5.2 Maintenance
5.2.1 Any problem observed in the chamber shall be reported to the Engineering Department, and a Maintenance Work Permit shall be filled as per Annexure.
5.2.2 The chamber fan and condenser fan shall be checked once every four months. If found loose, they shall be tightened.
5.2.3 The safety cut-off system shall be checked every four months by applying external heat to the dry bulb sensor.
5.2.4 Maintenance shall be performed whenever any malfunction or abnormality is observed in the chamber.
5.2.5 Preventive maintenance of the stability chamber shall be carried out by the service engineer once every four months, and records shall be maintained as per Annexure.
5.2.6 If any abnormality is observed by the service engineer, corrective action shall be taken immediately.
5.2.7 Check the incoming electrical supply of 230 V AC with Neutral and proper earthing.
5.2.8 Maintenance records shall be maintained as per Annexure.
5.3 Troubleshooting
5.3.1 Cooling Effect Not Achieved with Regular Cooling System
| Reason | Corrective Action |
|---|---|
| MCB may have tripped | Check MCB5 (604 & 605). If found tripped, switch it ON. |
| DC output not available | Check DC output from the temperature controller. |
| SSR not working | Check DC supply from controller terminals 13 (351) & 14 (352) to SSR terminals 3 (+) & 4 (-). If DC voltage is present but SSR output terminal (606) does not show 230 V phase, replace the SSR. |
| Compressor overload or capacitor not working | Check compressor overload and starting/running capacitor. Replace if faulty. |
| Time delay faulty | Check supply from compressor switch (S/W5) to time delay. If supply at point 604 is absent, replace the time delay. |
| Condenser motor not working | Check the motor winding. |
5.3.2 Chamber Motor Not Working
| Reason | Corrective Action |
|---|---|
| MCB may have tripped | Check MCB1 (401 & 402). If tripped, switch it ON. |
| Starting capacitor faulty | Check starting capacitor and replace if defective. |
| Motor burned out | Check motor winding. Replace motor if burned or faulty. |
5.3.3 Controller Not Working
| Reason | Corrective Action |
|---|---|
| MCB blown off | Check MCB2 (312 & 313). Replace if blown. |
| Display card or internal component loose | Replace controller if display card or internal components are loose. |
| CVT not working | Check CVT output voltage (should be 230 VAC). Replace CVT if voltage is not obtained. |
5.3.4 Controller Showing “OPEN”
| Reason | Corrective Action |
|---|---|
| Sensor wire broken | Check sensor wire and replace if broken. |
| Sensor wire loose connection | Check sensor wire connection on controller and tighten if loose. |
5.4 Calibration
5.4.1 Calibration of the Cooling Cabinet shall be performed once a year by an external approved agency.
5.4.2 Calibration records shall be maintained as per Annexure.
6.0 List of Annexures
| Annexure No. | Description |
|---|---|
| Annexure – 1 | Cooling Cabinet Cleaning Record |
| Annexure – 2 | Cooling Cabinet Maintenance Record |
| Annexure – 3 | Cooling Cabinet Calibration Record |