Guide
Cold room and fridge temperature monitoring: manual logs vs wireless sensors
A manual log shows the temperature at the moments someone looked. A wireless sensor records all the time in between and can tell the team when a limit is passed. A manual log is a fair record if it is done on time and acted on. A sensor closes the gaps that a manual log cannot: nights, weekends, holidays and the hour after the last check.
What a manual log gives you
Someone reads the display on the cold room or the thermometer inside the fridge, and writes the number and the time on a sheet or enters it on a tablet. It costs almost nothing, it works anywhere, and a team that does it consistently has a usable record of every check. Its limits are built in. It shows the temperature at that minute only. If the compressor fails five minutes after the check, the log looks fine until the next one. And it depends on someone remembering.
What a wireless sensor gives you
A small sensor inside the cold room or fridge measures the temperature at intervals and sends it to the system by radio. The record is continuous, the team does not have to walk to the unit, and the system can compare each reading with the limit. In Temperature Intelligence, when a reading passes the limit the responsible team gets a push notification and acknowledges the incident. The incident stays open until the cause, the action and the decision on the food are recorded.
Side by side
| Question | Manual log | Wireless sensor |
|---|---|---|
| What does it show? | The reading at each check | The reading around the clock |
| Nights and weekends | Usually no entries | Recorded like any other hour |
| Who finds out when it fails? | Whoever does the next check | The responsible team, by push notification |
| Missed checks | Possible, and only noticed later | Not applicable, the sensor does not forget |
| Cost and effort | Low cost, staff time every day | A sensor per unit, then little staff time |
| What it cannot do | Show what happened between checks | Repair the unit or decide what to do with the food |
What a sensor does not do
A sensor reports. It does not cool the room. Somebody still has to move the stock, call the engineer and decide whether the food can be used. That is why the notification matters less than what follows it: who acknowledges, what the cause was, what was done, and what happened to the food. A system that only sends alarms leaves you with a phone full of messages and no record of the decisions.
Where to put a sensor
Follow the sensor maker's instructions, and think about what the reading should represent. A sensor in the stream of cold air from the fan reads colder than the food. One by the door reads warmer every time the door opens. Many kitchens place it where the warmest food sits, away from the fan and the door, and check it against a reference thermometer when it is installed.
Setting the limit and the alert
The limit for each unit comes from your food safety plan, not from the sensor. Decide it with whoever owns the plan. Then decide who is told. A notification that goes to the whole kitchen is ignored. One that goes to the responsible team, and has to be acknowledged, gets an answer. Brief rises when the door is open are normal in a busy kitchen, so ask how the system handles them before you rely on it.
Keep a human check anyway
Even with sensors, many kitchens keep a daily look at the unit: is the door sealing, is the ice building up, does the display match the sensor. It takes a few seconds and catches problems a sensor does not measure.
Choosing for your kitchen
- One small kitchen, closed overnight, one fridge: a manual log may be enough, if it is done at fixed times.
- A walk-in with a week's stock, or a hotel with kitchens running through the night: a sensor is worth it, because the cost of a failure is a whole room of food.
- A producer with several cold rooms: sensors, because the records are part of the product record too.
The ProOps pages for hotels, catering and central kitchens and dairies and cheese makers show how this looks in each kind of kitchen. For what to write down, see what temperature records a food business in Cyprus should keep. Whichever you choose, check the current requirements with your competent authority.
Watch a cold room incident from start to finish. The demo uses sample data from a fictional hotel.
Book a demoQuestions
Is a manual temperature log still acceptable?
A manual log can be a perfectly good record if it is made at the intervals your plan sets and acted on. It cannot show what happened between checks. Check what your competent authority expects for your business.
How many sensors do I need?
One for each cold room, fridge or freezer you want recorded, because a sensor measures the place it sits in.
What happens when the sensor reading passes the limit?
In ProOps the responsible team gets a push notification and acknowledges the incident. It stays open until the cause, the action and the decision on the food are recorded.
Do sensors replace checking the unit by eye?
No. A quick daily look at the door seal, the ice and the display still catches things a sensor does not measure.
What if the Wi-Fi or power goes down?
Ask any supplier how the sensor behaves when the connection drops, for example whether it stores readings and sends them later, and keep a manual check as a fallback.
See it on your own checks.
A 20-minute call. We set up your checklists, tickets, audits and machines in a demo account and walk through them with you.
Prevent. Acknowledge. Prove.