Description
All DS1921G-F5# iButton® Data Loggers from iButtonlink include our Basic ExactLog Software License, free of charge!
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” is best suited for applications with moderately long logging rates. Popular use cases 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 that range. Resolution is 0.5°C. It can record up to 2048 values at a logging rate of 1 to 255 minutes. See battery life details in the DS1921G-F5# data sheet.
Calibration
A NIST traceable certificate for any DS1921G-F5# purchased from iButtonLink is available for download on the Maxim/Analog 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 need more accurate readings around specific points, we suggest adding our 3-Point Accredited Temperature Calibration. Calibrated iButtons are tested by our in-house, accredited calibration lab and provide:
- Proven accuracy
- Verified equipment quality
- Compliance with medical/food safety standards
Thermochron models vary in operating temperature range, memory, and reading accuracy. See the table below for comparisons with other iButton® models.
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 | Datasheet |
|---|---|---|---|---|---|---|
| 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 | Datasheet |
| DS1921H | +15°C to +46°C | +/- 1°C | 0.125°C | 2048 | 1 to 255 min | Datasheet |
| DS1921Z | -5°C to +26°C | +/- 1°C | 0.125°C | 2048 | 1 to 255 min | Datasheet |
| DS1922E | +15°C to +140°C | +/- 1.5°C: 110°C to +140°C +/-7°C typical from 15°C to 110°C |
Programmable 0.5°C (8-bit) / 0.0625°C (11-bit) |
8192 (8-bit) or 4096 (16-bit) | 1 sec to 273 hrs | Datasheet |
| DS1922L | -40°C to +85°C | +/- 0.5°C: -10°C to +65°C (with software correction) |
Programmable 0.5°C (8-bit) / 0.0625°C (11-bit) |
8192 (8-bit) or 4096 (16-bit) | 1 sec to 273 hrs | Datasheet |
| DS1922T | 0°C to +125°C | +/- 0.5°C: +20°C to +75°C (with software correction) |
Programmable 0.5°C (8-bit) / 0.0625°C (11-bit) |
8192 (8-bit) or 4096 (16-bit) | 1 sec to 273 hrs | Datasheet |
| DS1925L | -40°C to +85°C | +/- 0.5°C: -40°C to +85°C (with software correction) |
Programmable 0.5°C (8-bit) / 0.0625°C (11-bit) |
122K (8-bit) or 61K (16-bit) | 3 min to 273 hrs | Datasheet |
| DS1923 Hygrochron | -20°C to +85°C Humidity: 0–100% |
+/- 0.5°C: -10°C to +65°C (with software correction) |
Programmable 0.5°C (8-bit) / 0.0625°C (11-bit) |
8192 (8-bit) or 4096 (16-bit) | 1 sec to 273 hrs | Datasheet |
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