iButton temperature data loggers

This surprising data logger looks exactly like a small battery, but has the features of a larger datalogger. The price is on level with disposable chart recorders, however the Thermochron ® iButton has an expected life time of up to 8 years. It is water resistant and accurate to ±1 °C. To run the system you need a Thermochron ® interface, any number of Thermochrons ® and software.


Thermochron datalogger

Available Features

  • Water resistant
  • Meets UL#913 for intrinsically safe apparatus, approved under entity concept for use in Class I, Division 1, Group A,B,C and D Locations (application pending)
  • Intervals: May be set from 1 second to 4.5 hours, depending on model.
  • Two alarm points (max and min) may be set in software when starting the logger. Alarm status and time in alarm is shown when querying the logger from the computer.

This data logger has all the features of a larger temperature datalogger, but is the size of a small coin cell battery. These dataloggers are inexpensive, with a lifetime of 5-7 years. iButton dataloggers are water resistant and accurate to ±1 °C between -30 to + 70 °C.

Temperature Technology has expanded the T-TEC datalogger software to also operate the iButtons. A starter kit, complete with software, iButtonspecific serial interface or USB adaptor and one Thermochron data logger, is available.

Model numberTemperature RangeMemory
DS1921G -30 + 70 °C 2,048
DS1921H +15 + 46 °C 2,048
DS1921Z -5 + 26 °C 2,048
DS1922E +15 +140 C 4,096 or 8,192*
DS1922L -30 +70 C 4,096 or 8,192*
DS1922T 0 + 125 C 4,096 or 8,192*
DS1923 -20 +85 C, 0 - 100%RH 2,048 or 4,096*

*Depending on resolution


Further technical specifications for iButtons

Thermochron and iButton are registered trademarks of Maxim Integrated Products.