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DS1921G-F5# Thermochron, 4K

by Maxim/Dallas iButton Products


Quantity

We currently have 76 in stock.

About the DS1921G-F5# iButton

The DS1921G-F5# Thermochron iButton is a low-cost, reliable iButton® with a wide temperature range and long battery life. The "21G", as we call it, is best suited for applications with moderately long logging rates. Some of the most popular use cases for the 21G include research projects, cold-chain monitoring, and logging room temperatures.

The DS1921G-F5# has a temperature range of -40°C to +85°C, with an accuracy of ±1°C in the range of -30° to +70°C and ±1.3°C outside of that range. The resolution of the DS1921G's readings is 0.5°C. It can read up to 2048 values at a logging rate of 1 minute to 255 minutes. You can find detailed information on battery life on page 5 of the DS1921G-F5# data sheet.

Calibration

A NIST traceable certificate for any DS1921G-F5# purchased from iButtonLink is available for download on the Maxim website. You can also view a sample certificate here. Please see the iButton® Data-Logger Calibration and NIST Certificate FAQs for more information.

If you are using iButtons for an application that requires more accurate readings, we suggest adding our 3-Point Accredited Temperature Calibration. Calibrated iButtons are tested by our in-house, accredited calibration lab and provide a host of benefits such as:

  • Proven accuracy
  • Verified equipment quality
  • Compliance with medical/ food safety standards


*Thermochron models vary in the operating temperature range, the amount of memory available for storage, and the temperature reading accuracy. Please check out the table below for comparisons with other iButton models and let us know if you have any questions. 

 

Thermochron and Hygrochron

COMPARISON CHART

Both measure and datalog temperature in various ranges and accuracy.

Hygrochrons measure humidity in addition to temperature.

Model

 

Temperature Range Accuracy Resolution Values / Readings Logging Rate

DS1921G

-40°C to +85°C

+/- 1°C: -30°C to +70°C
+/- 1.3°C outside this range

0.5°C 2048 1 to 255 min

DS1921H

+15°C to +46°C +/- 1°C 0.125°C 2048 1 to 255 min

DS1921Z

-5°C to +26°C +/- 1°C 0.125°C 2048 1 to 255 min

DS1922E

+15°C to +140°C

+/- 1.5°C:  110°C to +140°C
+/-7°C is typical from 15°C to 110°C

Programmable
0.5°C - 8bit / 0.0625°C - 11 bit

8192 - 8 bit or 4096 - 16 bit

1 sec to 273 hrs

DS1922L

-40°C to +85°C

+/- 0.5°C:  -10°C to +65°C
(with software correction)

Programmable
0.5°C - 8bit / 0.0625°C - 11 bit

8192 - 8 bit or 4096 - 16 bit

1 sec to 273 hrs

DS1922T

0°C to +125°C

+/- 0.5°C:  +20°C to +75°C
(with software correction)

Programmable
0.5°C - 8bit / 0.0625°C - 11 bit

8192 - 8 bit or 4096 - 16 bit

1 sec to 273 hrs

DS1923

Hygrochron

-20°C to +85°C

Includes 0 to 100% humidity logger

+/- 0.5°C:  -10°C to +65°C
(with software correction)

Programmable
0.5°C - 8bit / 0.0625°C - 11 bit

8192 - 8 bit or 4096 - 16 bit 1 sec to 273 hrs
NASA is using Thermochrons for the History of Winter program.  Take a look to see some serious Thermochron use!
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