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Robuster Mini-Datenlogger in

button cell, for recording temperature and humidity measurements

Mini Temperatur und Feuchte Datenlogger tempmate B
  • Description

  • Technical data

  • FAQ

Mini temperature and humidity data logger

Each tempmate.®-B4 mini data logger can record up to 4,096 temperature and humidity measurements. The temperature range spans -20°C to +85°C, with an accuracy rate of up to ±0.5°C (temperature) and 5% (humidity). The software also shows dew point and absolute humidity. Thanks to its extremely compact construction (about the size of a watch battery), the logger is extremely versatile.

Programming and analysis

The logger can be connected to a PC via the USB interface, and the user-friendly TempIT software enables you to programme it and read and analyse the recorded data. The TempIT-Lite software is available free of charge from our website. For more detailed analyses and data export (for example Excel or Word), we have the TempIT-Pro and TempIT-Pro with USB dongle versions. It is possible to upgrade from TempIT-Lite to TempIT-Pro at any time.


The mini data loggers in the tempmate.®-Bx range are complemented by a range of special protective housings and mounting brackets. These enable you to use the logger in applications where it needs to be absolutely watertight and pressure-tight, without further action necessary.

Measurement range -20°C to +85°C
Accuracy ±0.5°C at -10°C to +70°C
±5% RH
Resolution 0.5°C (8-bit)
0.07°C (11-bit)
Storage capacity 8,192 measurements (8-bit) (4,096 temperature and 4,096 humidity)
4,096 measurements (11-bit) (2,048 temperature and 2,048 humidity)
Protection class
IP55 – Splashwaterproof
Power supply
Internal, fixed 3.0V lithium battery
Battery life approx 5 years at +30°C and 10 minute sampling rate
See battery life calculator at the bottom of the page
Measurement interval 2 seconds to 24 hours
Start delay Max 12 months at 1 minute measurement frequency
Housing material 305SS stainless steel
Guarantee 1 year
Dimensions Diameter = 17mm x H = 6mm
Response time
approx 90 seconds in the air
Weight 4g
EX zone suitability Meets UL#913 (4th Edit), Intrinsically Safe Apparatus, approval under Entity Concept for use in Class I, Division I, Group A, B, C and D Locations
Clock accuracy ±2 minutes per month
Recording modes Circular buffer or stop when full
Alarm thresholds Min/max freely configurable
Owner identification Max 32 characters 
User identification Max 64 characters 

Can the mini data loggers be used in a vacuum environment?

At the moment, there are no specifications that clearly verify suitability for vacuums. However, various customers use the devices in vacuum environments. If doing so, ensure that the vacuum is not built up suddenly, but rather evacuated evenly. In this way, the logger will be evacuated with its environment. Furthermore, ensure that the logger is not exposed to high humidity in the vacuum without protection, as otherwise, when venting it, moisture can diffuse into the logger.

However, we suggest to all customers that they purchase a logger and test its suitability for their own application. In such circumstances, we can loan you a communication interface.

How can the battery life be optimised?

If the logger will not be used for a longer period of time, you should set the sampling rate to 23 hours for the duration of this period. With this setting, the least amount of power is required, which increases the logger’s service life significantly.

How can I activate lower sampling rates?

This option needs to be activated. In the TempIT software, go to Configuration > Device > SL5x and remove the checkmark next to: ‘Suppress rapid sampling rate’ > and confirm with the password

How can I recognise which model I have?

The individual tempmate.®-Bx mini data loggers all look absolutely identical. However, the codes engraved on the underside will help you clearly identify the different loggers. On the bottom, you will see the code DS19xxx, where xxx is as follows: 21G = tempmate.®-B1, 22L = tempmate.®-B2, 22T = tempmate.®-B3, 23 = tempmate.®-B4 and 22E = tempmate.®-B5



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Measurement range:
-20°C to +85°C

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