iButton Temperature Loggers DS1921G DS1922 DS1923

iButton Hygrochron Temperature Humidity Loggers

General Description

The Thermochron ® iButton ® device (DS1921G) is a
rugged, self-sufficient system that measures temperature
and records the result in a protected memory section.
The recording is done at a user-defined rate, both as a
direct storage of temperature values as well as in the
form of a histogram. Up to 2048 temperature values
taken at equidistant intervals ranging from 1 to 255min
can be stored. The histogram provides 63 data bins with
a resolution of 2.0°C. If the temperature leaves a user-
programmable range, the DS1921G also records when
this happened, for how long the temperature stayed out-
side the permitted range, and if the temperature was too
high or too low. An additional 512 bytes of battery-
backed SRAM allow storing information pertaining to the
object to which the DS1921G is associated. Data is
transferred serially through the 1-Wire ® protocol, which
requires only a single data lead and a ground return.
Every DS1921G is factory lasered with a guaranteed
unique, electrically readable, 64-bit registration number
that allows for absolute traceability. The durable stainless
steel package is highly resistant to environmental haz-
ards such as dirt, moisture, and shock. Accessories per-
mit the DS1921G to be mounted on almost any object
including containers, pallets, and bags.

Applications

Temperature Logging in Cold Chain, Food Safety,
Pharmaceutical, and Medical Products

DS1921G Thermochron iButton Device

DS1921H High-Resolution Thermochron iButton Devices

DS1921Z High-Resolution Thermochron iButton Devices

DS1922E iButton High-Temperature Logger with 8KB Data-Log Memory

DS1922L iButton Temperature Loggers with 8KB Data-Log Memory

DS1922T iButton Temperature Loggers with 8KB Data-Log Memory

DS1923 iButton Hygrochron Temperature/Humidity Logger with 8KB Data-Log Memory

DS1925 iButton High-Density Temperature Logger with 122KB Data-Log Memory

DS9097U-S09 Universal 1-Wire COM Port Adapter

DS1402D-DR8 1-Wire Network Cables

DS1921G iButton Temperature Loggers,ds1923,ds1922,ds1921