Does a Walk-In Refridgerator need to have an internal thermometer for temperature monitoring asides from the external thermometer?
This requirement is being suggested to be included in our Kitchen Food Safety Checklist. But I have questioned the rationale behind this. A mecury glass thermometer has ben recommended, but as far as I know, having a thermometer in the WIR is a no-no from a HACCP point of view i.e. Hazard of glass if it breaks or worse still mercury leaking off & geting into the food stored therein, likewise a digital batery operated thermometer has its inherent hazards too aside from the fact that the battery will cold-out in a matter of hours.
The reason for this requirement is because the sensor of the external thermometer is located in one corner of the WIR and they want to be sure that the temp is within requirement in other parts of the WIR. I was of the opinion that as long as the WIR is not overloaded and there is enough space for air circulation adn the cooling system is not covered or blocked, this shouldnt be an issue.
My argument so far has failed to persuade the Industrial Hygiene Dept.
Could anyone offer more convincing arguments I could raise?
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