DS1921G-F5# Thermochron, 4K
by Maxim/Dallas iButton ProductsAbout 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.
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Thermochron and Hygrochron COMPARISON CHART Both measure and datalog temperature in various ranges and accuracy. Hygrochrons measure humidity in addition to temperature. |
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Model |
Temperature Range | Accuracy | Resolution | Values / Readings | Logging Rate |
| -40°C to +85°C |
+/- 1°C: -30°C to +70°C |
0.5°C | 2048 | 1 to 255 min | |
| +15°C to +46°C | +/- 1°C | 0.125°C | 2048 | 1 to 255 min | |
| -5°C to +26°C | +/- 1°C | 0.125°C | 2048 | 1 to 255 min | |
| +15°C to +140°C |
+/- 1.5°C: 110°C to +140°C |
Programmable |
8192 - 8 bit or 4096 - 16 bit |
1 sec to 273 hrs | |
| -40°C to +85°C |
+/- 0.5°C: -10°C to +65°C |
Programmable |
8192 - 8 bit or 4096 - 16 bit |
1 sec to 273 hrs | |
| 0°C to +125°C |
+/- 0.5°C: +20°C to +75°C |
Programmable |
8192 - 8 bit or 4096 - 16 bit |
1 sec to 273 hrs | |
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Hygrochron |
-20°C to +85°C Includes 0 to 100% humidity logger |
+/- 0.5°C: -10°C to +65°C |
Programmable |
8192 - 8 bit or 4096 - 16 bit | 1 sec to 273 hrs |
