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Why Are Temperature Data Loggers & Humidity Meters Important for Quality Assurance?

Written by Janice M on . Posted in Hygiene & Quality Control

To understand why Temperature Data Loggers and Humidity Meters are essential to any quality assurance programme in the agricultural / food industry, we need to understand what these instruments can do.

What is a data-logger?

Data-loggers are electronic devices that record temperature over a period of time for analysis at a later date. The user programs what information is required and the data-logger records it.

The Data-loggers incorporate thermistor or thermocouple sensors that measure the temperature and the data-loggers internal micro-processor chip then stores the data.

The stored data can then be transferred to a computer, via a USB cradle, lead or base station for further analysis at a time convenient to the user.

The latest models allow data to be transferred to a smart device via wi-fi.

A flashing alarm will indicate when your preset temperature have been exceeded. It forms part of due diligence and HACCP reports in a Quality Assurance programme.

What is a ThermaData Humidity-Temperature Logger?

This device will record both Humidity and Temperature over time.

More details

data_logger_useWhy is it Important to use a Data-logger?

It is important for many organisations, mainly in the food industry, to be able to verify that the temperature of food has been kept at the correct levels. This is often referred to as due diligence.

Data-loggers allow you to monitor that perishable foods, drinks or crops are kept at recorded, optimum temperatures and humidity for the best quality. Keeping strict control of temperature and humidity at critical control points saves producers money by preventing waste.

For growers of fresh produce, data loggers provide an accurate record of temperatures during the life cycle of the product – from farm to plate, i.e. during growth, preparation and transportation of produce, thus ensuring best quality.

For shippers / transportation companies, data-loggers can verify that conditions within the vehicles have been maintained within the specified levels.

Updated Technology can make monitoring temperatures easier

The latest Data Loggers can be linked to wi-fi, which allows you to be notified of any changes in temperature on a smart device, even when you are not on site.

What is a Hygrometer?

A hygrometer is an instrument used to measure the quantity of water vapour present in the air.

Hygrometers can measure relative humidity over the range of 0 – 100% RH but in most instruments, this range may be more limited, depending on the sensor type. Relative humidity is expressed as the ratio of the amount of water vapour present in the air or gas, tot he quantity which would reach saturation, saturation being 100%.

Why measure Humidity?

Many products are sensitive to variations in humidity. Therefore, humidity needs to be measured and controlled for the end products to be consistent in both quality and performance.


  • Pharmaceutical products are sensitive to variations in humidity
  • Food – Many food preservation techniques are dependant on limiting the activity of water
  • Paper and paper based products
  • Computer rooms and electronic components
  • Rooms & buildings – humidity levels above 70% allows mould to develop and can also encourage dust mites to breed. Humidity levels below 25% can cause respiratory discomfort.

What is Dew Point?

The lower temperature to which air must be cooled in order for condensation (saturation) to occur. It is dependent on the concentration of water vapour present.

It can be measured with a Psychrometer

What is a Therma-Hygrometer?

Displays both Temperature and Humidity.

More detail

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