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A selection of “interesting” vaccine fridges

We see a range of vaccine fridge data graphs. Normally, modern vaccine fridges are very good at maintaining constant temperatures, but Clever Logger's live temperature data tracking can show us exactly what happens when things go wrong

The perfect vaccine fridge?

Vaccine storage is all about Strive for Five, right? Well, is this the perfect vaccine fridge? It’s certainly one of the most consistent we’ve seen.

The average temperature is bang on 5° and the variation between the min and max temperatures is an incredible 0.5°.

A more typical vaccine fridge

This fridge is much more typical. Still nicely averaging close to 5° but with a min-max variation closer to 2°.

If your Clever Logger graph looks like this, you should be happy with your vaccine fridge.

Normal fridge operation

This graph close-up show how fridges work. The temperature in the fridge cabinet slowly rises as warmth from the outside raises the temperature of the air in the fridge.

When it reaches a certain temperature, a sensor turns the fridge’s compressor on and the temperature in the fridge starts to fall.

When the low temperature is reached, the compressor switches off. The temperature begins to rise and the cycle repeats.

The defrost cycle

This is something we see a lot in food fridges and freezers, but not generally in vaccine fridges – a defrost cycle. The regular spikes in temperature are the fridge warming up to prevent icing up.

We couldn’t figure out why this was showing up on the graph until the customer told us that they has stuck the logger to wall of the fridge with double sided tape. This is a no-no as the logger then tends to measure the temperature of the cabinet wall rather than the air temperature.

The classic power failure

When the power goes out, we see the temperature slowly rise. Then, when the power comes back on, the temperature rapidly falls back into range.

Low on refrigerant

This poor fridge is really struggling – it is low on refrigerant gas.  When the compressor kicks in, the lack of refrigerant means the fridge can’t produce very cold air and must run for a really long time to lower the temperature.

This compressor is running flat-out constantly for hours and hours at a time. Imagine the electricity bill!

Compressor locked on

Here’s the opposite problem – a fridge that cooled things down too well.

In this fridge, the sensor that was meant to switch the compressor off at a certain temperature failed and the fridge kept running until the temperature reached a staggering -16°. Of course, everything in the fridge was frozen solid.

What latency looks like

Different devices have different latency – that is, the time it takes to recognise a temperature change. Sometimes this is a bad thing. Sometimes, it is by design.

The graph below shows data from a Dual Temperature Logger.

As the name suggests, this type of logger has two sensors – and internal sensor in the case of the logger, and an external sensor in a probe on the end of a cable.

In this case, the probe is in a vial of liquid glycol, so it has a much higher latency than the internal sensor.

This is reflected in the graph. The blue graph shows the sensor measuring the air temperature. The magenta line shows the data coming from the probe in the liquid.

As you can see, the data from the liquid shows much less variation between the upper and lower temperatures.

Clever Logger Dual Temperature Logger

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Use the data to make adjustments

The whole point of having great data from your Clever Logger is to keep your fridge or freezer running perfectly and keep your stock safe.

This food fridge seems to be working OK, but the temperature is regularly above 5°C for long periods of time. The fridge needs to be adjusted so that the maximum temperature stays under 5° and out of the danger zone.

Recognising problems early

When your Clever Logger starts letting you know about problems, it’s important to act.

In our last example, we see a fridge that was going along beautifully when it began to fail. 

When you see anything out of the ordinary, contact your fridge technician immediately and get them to come and take a look.


You're going to love Clever Logger

To prove it, we’ll send you a Starter Kit to try out for a whole month.

Set it up, have a play, explore the features – obligation free.

If you love it, just let us know.

If not, just send it back.

What is NATA?

The National Association of Testing Authorities (NATA) is the recognised national accreditation authority for analytical laboratories and testing service providers in Australia. It is an independent, not-for-profit organisation that provides independent assurance of technical competence. 

NATA accredits organisations to perform testing and inspection activities for their products and services. This gives consumers the assurance they need to make safe, healthy and reliable choices .

Location Views

In the top right corner of the Location page, you will find the View chooser.

There are three options: Simple, Detailed and Gauge.


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