CLEVER LOGGER NEWS

Vaccine fridge diagnosis with Clever Logger

After installing a Clever Logger in a vaccine fridge, we noticed some very unusual temperatures

Vaccine fridge is reading very low - user story

Recently we had a user contact us with results that they didn’t understand. They had a vaccine fridge that had been working fine, but they were now starting to get alarms from Clever Logger. In fact, they were getting A LOT OF ALARMS.

When we checked their results we saw this:

CleverLogger graph shows a vaccine fridge reading too low

Notice how the troughs are dropping down below 0°C – not good for a vaccine fridge.

Not only was this fridge dropping below the mandatory 2°C for vaccines, it was dropping below 0°C. That’s really bad for vaccines. 

A common response is to doubt the results and replace the logger. Fortunately they spoke to the right person who had them do some simple checks before replacing the logger.

A real problem

The problem was that ice had formed on the compressor and air blowing across the ice was being super cooled. 

After the fridge was switched off and defrosted, the fridge returned to normal.

CleverLogger-shows-a-vaccine-fridge-after-defrost

This example shows the importance of not ignoring low readings – it may mean there is something wrong with the fridge.

Some of the quick checks we recommend you do is to look inside the fridge for the formation of ice or water, especially at the base of the fridge. 

Also ensure that there is plenty of space within the fridge for air to move freely about. Do not overstock a vaccine fridge.

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Clever Logger temperature logger with external probe

Logger with Dual Temperature Sensors

QUICK SPECS
Model CLD-01
Type Temperature only with Dual Sensors
Temperature Range Internal sensor: -23°C to +60°C
External sensor: -40°C to +80°C
Humidity Range N/A
Battery Type CR2450
Battery Life Replace every 12 months
Accuracy Internal Sensor:
±0.3℃ (0℃ to +60℃)
±0.3℃ to ±0.7℃ (other temperatures)
External Probe:
±0.5℃ (-20℃ to +40℃)
±1℃ (other temperatures)
Offline Memory approx 24 days logging at 5 minute intervals
Clever Logger temperature logger with external probe

Logger with External Probe

QUICK SPECS
Model CLX-01
Type Temperature only with Probe
Temperature Range -40°C to 60°C
Can operate up to 80°C for short periods
Humidity Range N/A
Battery Type CR2450
Battery Life Replace every 12 months
Accuracy ±0.5℃ (-20℃ to +40℃)
±1℃ (other temperatures)
Offline Memory approx 24 days logging at 5 minute intervals