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Thermochrons / Hygrochron


Thermochron Mounted in Fob & DS9107+

The Thermochron family of iButtons are temperature data loggers which record and store time, temperature, and optional humidity for later analysis. The iButton's embedded computer chip integrates a globally unique address, a thermometer, a thermal history log, an alarm event log, and additional memory to store user data, such as location data or a shipping manifest. Thermochrons are recyclable, and under normal conditions, will log data for up to 10 years or 1 million temperature measurements. The following table is a comparison of the available Thermochron models:

Model Temperature Range Accuracy Resolution Values/Readings Logging Rate
DS1921G-F5# -40°C to +85°C ± 1.0°C (-30 to +70°C)
± 1.3°C Full Scale
0.5°C 2KB 1 to 255 mins
DS1921H-F5# 15°C to 46°C ± 1.0°C Full Scale 0.125°C 2KB 1 to 255 mins
DS1921Z-F5# -5°C to 26°C ± 1.0°C Full Scale 0.125°C 2KB 1 to 255 mins
DS1922E-F5# 15°C to 140°C ± 1.5°C (+110 to +140°C)
± 7°C Full Scale
0.5°C - 8 bit
0.0625°C - 11 bit
8KB 1 sec to 273 hrs
DS1922L-F5# -40°C to +85°C ± 0.5°C (-10 to 65°C)
± 1.6°C Full Scale
0.5°C - 8 bit
0.0625°C - 11 bit
8KB 1 sec to 273 hrs
DS1922T-F5# 0°C to 125°C ± 0.5°C (+20 to +75°C)
± 2.1°C Full Scale
0.5°C - 8 bit
0.0625°C - 11 bit
8KB 1 sec to 273 hrs
DS1923-F5# - Hygrochron -20°C to +85°C ± 0.5°C (-10 to +65°C)
± 1.4°C Full Scale
0.5°C - 8 bit
0.0625°C - 11 bit
8KB 1 sec to 273 hrs
DS1925L-F5#Button Reading New -40°C to +85°C ± 0.5°C Full Scale 0.5°C - 8 bit
0.0625°C - 11 bit
122KB 5 min to 273 hrs

Scientific Research Projects - iButtons can be discretely located in the environment for monitoring the temperature of ecosystems. Their low-cost makes it possible to have multiple loggers spread throughout an area, and their small size means they can be attached to places previously impossible.

Monitoring Thermally Sensitive Products - iButtons easily attach to containers of frozen or fresh foods, blood products, and chemicals or drug reagents, recording time and temperature during transport and storage. By logging the thermal experience of temperature-sensitive material, you can pinpoint responsibility for spoilage and take corrective action.

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