The DS1921H Thermochron iButton 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 255 minutes can be stored. The histogram provides 64 data bins with a resolution of 0.5°C. If the temperature leaves a user-programmable range, the DS1921H will also record when this happened, for how long the temperature stayed outside the permitted range, and if the temperature was too high or too low. Additional 512 bytes of read/write NV memory allow storing information pertaining to the object to which the DS1921H is associated.
Data is transferred serially via the 1-Wire protocol, which requires only a single data lead and a ground return. Every DS1921H 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 hazards such as dirt, moisture, and shock. Accessories permit the DS1921H to be mounted on almost any object, including containers, pallets, and bags.
Features
- Operating Temperature Range from +15°C to +46°C
- Measures temperature in 1/8°C increments with ±1°C accuracy
- Logs up to 2048 consecutive temperature measurements
- Built-in real-time clock (RTC) and timer has accuracy of ±2 minutes per month from 0°C to 45°C
- Water resistant or waterproof if placed inside DS9107 iButton® capsule (Exceeds Water Resistant 3 ATM requirements)
- Automatically wakes up and measures temperature at user-programmable intervals from 1 to 255 minutes
- Records a long-term temperature histogram with 1/2°C resolution
- Programmable temperature-high and temperature-low alarm trip points
- 512 bytes of general-purpose read/write NV random access memory
- Communicates to host with a single digital signal at 15.4kbits or 125kbits per second using 1-Wire® protocol
- Fixed range: +15°C to +46°C
Common iButton Features
- Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike
- Multidrop controller for MicroLAN
- Digital identification and information by momentary contact
- Chip-based data carrier compactly stores information
- Data can be accessed while affixed to object
- Button shape is self-aligning with cup-shaped probes
- Durable stainless steel case engraved with registration number withstands harsh environments
- Easily affixed with self-stick adhesive backing, latched by its flange, or locked with a ring pressed onto its rim
- Presence detector acknowledges when reader first applies voltage
- Meets UL#913 (4th Edit.). Intrinsically Safe Apparatus: approved under Entity Concept for use in Class I, Division 1, Group A, B, C and D Locations
Application
The DS1921H is intended for monitoring the body temperature of humans and animals and for monitoring temperature critical processes such as curing, powder coating, and painting. Alternatively, the DS1921H can be used for monitoring the temperature of clean rooms, and computer and equipment rooms. It can also aid in calculating the proportional share of heating cost of each party in buildings with central heating. The DS1921H has a fixed range of +15°C to +46°C. The high resolution makes the DS1921H suitable for scientific research and development. The read/write NV memory can store information such as shipping manifests, dates of manufacture, or other relevant data written as ASCII or encrypted files.
Note that the initial sealing level of DS1921H achieves the equivalent of IP56. Aging and use conditions can degrade the integrity of the seal over time, so for applications with significant exposure to liquids, sprays, or other similar environments, it is recommended to place the Thermochron in the
DS9107 iButton capsule.
F5 MicroCAN
