Cold Chamber Operation and Calibration SOP

In short: This illustrative SOP organizes routine operation, temperature monitoring, calibration and qualification records for a QC cold chamber. Setpoints, alarms, access steps and maintenance intervals must come from the approved use, equipment manual and local quality system; the example values below are not universal requirements.

1. Purpose and scope

Use this example as a starting point for a temperature-controlled chamber managed by a QC laboratory. Before adapting it, define the chamber’s intended use, the materials or products stored, their approved storage conditions, operating limits, monitoring system and responsible users. Do not assume a particular temperature range from the term “cold chamber.”

For storage areas used for time- and temperature-sensitive pharmaceutical products, WHO Technical Report Series No. 992, Annex 5, Supplement 7 (2015) discusses qualification, including control and monitoring systems, alarms, temperature distribution and recovery after door opening. WHO Supplement 8 (2015) discusses mapping of storage areas. Their applicability depends on what the chamber stores and how it is used.

2. Responsibilities and related procedures

• Trained user: check chamber status before use, follow approved loading and access procedures, and record or report alarms and abnormal conditions.
• QC lead or designee: maintain the approved operating and monitoring procedure, review records and ensure that required maintenance, calibration and qualification activities are planned.
• Quality assurance: oversee approval, change control and training under the local quality system.

These are example role assignments to adapt locally.

See also:

• SOP for operation and calibration of a refrigerator
• SOP for recording temperature and humidity of a stability chamber
• Temperature and relative humidity monitoring in pharmaceutical industry

3. Routine operation

3.1 Pre-use checks

1. Confirm the chamber ID, intended use, approved status and current setpoint or range from the local controlled documents.
2. Check the chamber and shelves for cleanliness and visible damage. Clean them only with materials and methods approved for that chamber and its stored contents.
3. Confirm that the temperature display, monitoring system and alarm status are available. Follow the local process if a calibration is overdue, a reading is outside the approved range, or an alarm is active.
4. Load and remove materials using the approved arrangement. Keep access brief enough to maintain the qualified conditions, and close the door fully after each access.

3.2 Controller and monitoring system

Use the equipment manual and approved access procedure to view the present value (PV), change a set value (SV), set the reporting interval and retrieve records. Do not place passwords or shared credentials in this public SOP template.

Example in-house criterion (not a pharmacopoeial requirement): this example SOP says to keep the PLC powered continuously (“24 hours”) and to limit each chamber opening to 5 minutes; it says a longer opening produces a red alarm and audible beep that must be acknowledged.

This example describes a password-protected menu for changing the SV and print frequency, then uses TOMCAT and DAAS software to select a date range and chamber ID, generate a report and print it. It says the report is printed each morning and that a holiday print is taken the next day.

Example in-house criterion (not a pharmacopoeial requirement): this example SOP describes a morning print each day and a next-day print after a holiday.

Review monitoring records at the frequency and by the role specified in the controlled local procedure. If a reading, alarm or data gap is outside expectations, protect affected materials as appropriate and follow the site’s documented excursion, investigation and escalation process. Record the event and disposition in the designated record.

4. Cleaning and maintenance

Clean the chamber, shelves and other applicable surfaces using the approved cleaning method. Check that the selected cleaning agent is compatible with the chamber and the materials stored in it.

Example in-house criterion (not a pharmacopoeial requirement): this example SOP schedules chamber cleaning weekly and suggests a lint-free, non-shedding cloth with disinfectant where applicable.

Arrange servicing and preventive maintenance under the approved equipment programme and the manufacturer’s current instructions. Document the work, any effect on chamber operation and any checks required before returning the unit to use.

5. Calibration and qualification

5.1 Temperature sensor calibration

This example SOP calls for an external party to calibrate the temperature sensor. WHO Technical Report Series No. 992, Annex 5, Supplement 10 (2015) describes periodic calibration of temperature measurement and control devices according to the device data sheet and operating range, and discusses suitable calibration services and certificates. It does not establish a universal six-month interval for every chamber.

Example in-house criterion (not a pharmacopoeial requirement): this example SOP states “half-yearly” calibration by an external party.

Review the certificate, instrument identity, calibration range, results and any corrections or restrictions under the local calibration procedure. WHO TRS 992, Annex 5, Supplement 7 (2015) includes verification that controllers and sensors have valid calibration certificates during operational qualification for temperature-controlled storage areas.

5.2 Qualification and temperature mapping

Keep the qualification protocol specific to the chamber, intended use and approved operating limits. For temperature-controlled storage areas used for time- and temperature-sensitive products, WHO Supplement 7 describes installation, operational and performance qualification. Its examples include testing control and alarm systems, mapping temperature distribution, and checking recovery after a representative door opening.

WHO Supplement 8 explains that repeat mapping frequency depends on the routine monitoring strategy; it gives three years as an example, and identifies significant changes and unexplained variability as reasons to consider remapping. This is guidance for storage areas in its stated scope, not a universal calendar interval for every laboratory chamber.

Example in-house criterion (not a pharmacopoeial requirement): this example SOP calls for temperature-distribution study yearly and after a major modification or major repair.

6. Records and retention

Maintain the controlled records applicable to the chamber, such as use and monitoring records, alarms and excursions, cleaning, maintenance, calibration certificates, qualification or mapping protocols and reports, and settings changes. Identify each record, who completes and reviews it, and where approved electronic or paper records are maintained.

Retain GMP records associated with a product batch for at least 1 year after the expiry date of that respective batch. Under EU GMP Part I Chapter 4 §4.11, batch documentation is retained for 1 year after expiry or 5 years after Qualified Person certification, whichever is longer; retain longer where local law or the marketing authorisation requires it. 21 CFR 211.180(a) sets at least 1 year after expiry for covered production, control or distribution records specifically associated with a drug-product batch.

Temperature-monitoring records and chamber-cleaning records are different records. Use separate approved forms if temperature monitoring and cleaning records are distinct.

7. Training and status

Train users on the approved operating, alarm-response, record-review and excursion procedures before they use the chamber. Keep current copies of relevant procedures available to authorised users. The local controlled SOP should identify the approver, effective date, revision history and distribution.

Frequently asked questions

What temperature should a cold chamber use?

Use the temperature range approved for its actual purpose and stored material. This example does not give a setpoint, and it does not assume one.

Is calibration every six months required for all cold chambers?

No universal six-month interval was found in the WHO temperature-device guidance checked. Establish the interval from the installed device’s instructions, operating needs and approved local programme.

Does temperature mapping always need to be annual?

The WHO mapping supplement describes periodic remapping based on the monitoring strategy and significant changes; it gives three years as an example. The annual interval in this example is an in-house criterion and needs local approval.

How long should batch-related chamber records be kept?

At least 1 year after the respective product batch expires. If EU GMP applies, retain batch documentation for 1 year after expiry or 5 years after Qualified Person certification, whichever is longer; retain longer when local law or the marketing authorisation requires it.

References

• World Health Organization. WHO Technical Report Series No. 961, Annex 9, “Model guidance for the storage and transport of time- and temperature-sensitive pharmaceutical products,” 2011.
• World Health Organization. WHO Technical Report Series No. 992, Annex 5, Supplement 7, “Qualification of temperature-controlled storage areas,” 2015. Official WHO PDF.
• World Health Organization. WHO Technical Report Series No. 992, Annex 5, Supplement 8, “Temperature mapping of storage areas,” 2015. Official WHO PDF.
• World Health Organization. WHO Technical Report Series No. 992, Annex 5, Supplement 10, “Checking the accuracy of temperature control and monitoring devices,” 2015. Official WHO PDF.
• European Commission. EudraLex Volume 4, Part I, Chapter 4, “Documentation,” §4.11, January 2011. Official Chapter 4 PDF.
• United States Government. 21 CFR §211.180(a), “General requirements,” current eCFR text accessed 19 October 2026. eCFR.