Temperature data logger


A temperature data logger is a device capable of automatically measure and save temperature. 

Temperature data loggers come in many different shapes and sizes, and with a large variety of different functions and specifications.

Common for all temperature data loggers is that temperature data can be exported and viewed, normally on a pc or on an online platform.

Data loggers vary in specifications from industry to industry

The use of temperature data loggers vary greatly for different sectors and industries, and the requirements for the temperature data logger also greatly depends on the use and governmental and other standard requirements.


In many cases the temperature data logger is used to monitor temperature that is of interest to a process which requires a certain temperature span to be held in order to obtain a specified result. 

A good example is the storage of vaccines, which often need to be held within 2 to 8 degrees in order for the vaccines to be useful.


Some temperature data loggers not only serve to monitor and document the temperature that was, but also work as an alarm system which can alarm in the event of a temperature excursion. In this case an alarm is sent to the user when an out of specification temperature is measured, and the user can react to the problem. 


What kind of specifications do I need to think about when choosing a data logger?

There are some general specifications of temperature data loggers that defines how they operate and how they can be used.


Cost and cost structure

Some temperature data loggers are purchased as single units, and some are purchased as part of a service, some times including the software package and calibration. 

The cost structure can be based on a yearly fee for the use of the associated software package, and some also include a regular calibration.

The running cost for non-service data loggers should be considered, as running calibration cost should also be considered when running a temperature data logger system.

Battery life

As most temperature data loggers run on battery, the battery life determines how long the temperature data logger can operature before a battery exchange is necessary.

Export of data

The data stored in the temperature data logger has to be exported from the data logger in order to document the measured data. This is mostly done either with data logger being inserted into a computers USB port, and then using the associated software to download the data from the data logger, or the the data logger can automatically transfer data on a regular basis wirelessly to an online system.


The resolution of measurements define how small temperature changes the data logger is able to measure temperature in. In other words how many digits can the temperature be measured in.

Temperature span or measurement area

Defines which temperatures the data logger is able to measure. This often has to do with the mechanical construction of the temperature data logger, and covers the span from low to high where the data logger can operate and measure temperatures.

Accuracy / precision

The accuracy / precision defines how accurate temperature can be measured. In other words; how close to the actual temperature does the data logger measure temperatures.


Calibration as described in greater detail below, describes how the temperature data logger is calibrated, and to what precision or uncertainty. The calibration of the temperature data logger ensures that the temperature that the temperature data logger measures is the same as all other temperature measuring devices, and calibration is required by many quality standards.


The software used for exporting and viewing (and possible alarming) varies greatly in ease-of-use, and functionalities. Some systems are very basic, and only allow for the export and viewing of data, while others include more functionalities such as user management, deviation management and calibration management.


Depending on whether the data logger was purchased as a one-time cost, or as a service model, the product guarantee can vary. 

Some data loggers come with a limited guarantee, and some come with a use guarantee where the product is replaced free of charge in the period of use.

Storage capacity

The amount of measurement points stored locally on the data logger is often referred to as the storage capacity, and is in most cases defined as the number of measurements that can be stored before unloading is needed. 

Dependent on the measurement interval, the time before unloading is needed varies as a high measurement frequency fills the internal memory faster than a lower one.


Calibrated temperature data logger

In most uses of a temperature data logger calibration is needed in order to ensure that the data logger measures correctly, and that this can proved. 

Calibration is the process of ensuring that the temperature data logger measures in accordance with international standards. 

Calibration is done by comparing the readings of the temperature data logger to a reference temperature reader. By comparing the readings of the temperature data logger to the reference, any differences can be observed and noted as the measurement error. 


As the comparison of the temperature data logger and the reference temperature ready can never be performed completely without error, a calibration is always associated with a certain uncertainty, known as the calibration uncertainty. The amount of uncertainty has something to do with the method of calibration, and the accepted uncertainty is often dictated by the quality requirements set forth by governmental or standards requirements.


The proof of calibration is known as the calibration certificate, and is the document provided by the calibration laboratory. A temperature data logger can only be said to be a calibrated temperature data logger when then calibration certificate is obtained. 

Based on the requirements, the calibration certificate can either be issued by a non-accredited or accredited laboratory.


The calibration can either be purchased at a calibration laboratory by sending in the data logger, or be part of the service associated with the data logger system.

What is a data logger?

A data logger, also known as a data recorder, is an electronic device that records temperature data in real-time. Almost all data loggers are based on microcontrollers. These devices are usually small, battery-powered, portable and are equipped with a microprocessor, which uses internal memory for data storage of temperature measurements.


Some data loggers are directly connected to a personal computer. By using specific software programs, it is possible to activate the data logger, view and analyze the collected data remotely. Other types of data loggers are designed as human interface devices that can be used as independent equipment.

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Benefits of using a data logger

One of the main benefits when using a data logger is the ability to automatically collect data 24/7. After the device is activated, it starts measuring the temperature right away. Afterwards, the data logger is normally left unattended to measure and record the temperature data throughout the monitoring period. This allows an overall and precise view of the environmental conditions being monitored. The process of viewing and analyzing the collected data differs according to the data logger used for temperature measurements.


A WiFi data logger permits accessing the data at any time and from anywhere through software or online platform that can be entered by using any type of devices, such as mobile phone, computer or tablet. A USB data logger has to be taken out manually from the cooling equipment and then connected to a computer in order to view and analyze the temperature data. This process interrupts the production and the operations since it requires the original USB data logger to be replaced with another data logger during the period it is taken out. Meanwhile, a wired data logger, which has high usage among Pharma and Pharmaceutical industries, requires a USB cable to connect to the PC. One cable is needed for each location when downloading and analyzing the temperature data.

USB Datalogger

USB data logger (fourtec Microlite)

Eupry Datalogger for temperature monitoring

Eupry WiFI Data Logger


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Eupry WiFi Data Logger

The Eupry WiFi Data Logger is a leading solution in the Pharma & Pharmaceutical industries, due to its high level of efficiency, time saving in operations and cost effectiveness in monitoring and support. The monitoring, alarming and reporting solutions for refrigerators and freezers that come when acquiring Eupry WiFi Data loggers, reduces the risk of losing temperature sensitive material and helps ensure regulatory compliance. 

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Eupry optimizes how organizations monitor, and document temperatures. Using the Internet of Things (IoT), Eupry changes the way organizations approach compliance, quality, and efficiency. We have a wide variety of customers in several sectors. If you have any questions regarding how to secure temperature sensitive goods, you are welcome to contact us.