Temperature Logger iButton, 8KB Datalog Memory


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Product No.: 72024

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The DS1922L temperature logger 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 userdefined rate. A total of 8192 8-bit readings or 4096 16-bit readings taken at equidistant intervals ranging from 1s to 273hrs can be stored. In addition to this, there are 512 bytes of SRAM for storing applicationspecific information and 64 bytes for calibration data. A mission to collect data can be programmed to begin immediately, or after a user-defined delay or after a temperature alarm. Access to the memory and control functions can be password protected.

The DS1922L is configured and communicates with a host computing device through the serial 1-Wire® protocol, which requires only a single data lead and a ground return. Every DS1922L is factory-lasered with a guaranteed unique 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 DS1922L to be mounted on almost any object, including containers, pallets, and bags.


  • Operating Temperature Range from -40°C to +85°C
  • Measures Temperature with 0.5°C or 0.0625°C Resolution
  • Automatically Wakes up, Measures Temperature, and Stores up to 8192 Values in 8KB of Datalog Memory
  • Accuracy of ±0.5°C from -10°C to +65°C with Software Correction
  • Sampling Rate from 1s up to 273hrs
  • Water resistant or waterproof if placed inside DS9107 iButton capsule (Exceeds Water Resistant 3 ATM requirements)
  • Programmable Recording Start Delay After Elapsed Time or Upon a Temperature Alarm Trip Point
  • Programmable High and Low Trip Points for Temperature Alarms
  • Quick Access to Alarmed Devices Through 1-Wire Conditional Search Function
  • 512 Bytes of General-Purpose Plus 64 Bytes of Calibration Memory
  • Two-Level Password Protection of All Memory and Configuration Registers
  • Communicates to Host with a Single Digital Signal at up to 15.4kbps at Standard Speed or up to 125kbps in Overdrive Mode Using 1-Wire Protocol

Common iButton Features

  • Digital identification and information by momentary contact.
  • Unique factory-lasered 64-bit registration number assures error free device selection and absolute traceability because no two parts are alike.
  • Built-in multidrop controller for 1-Wire net.
  • 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.


The DS1922L is an ideal device to monitor for extended periods of time the temperature of any object it is attached to or shipped with, such as fresh produce, medical drugs and supplies and for use in refrigerators and freezers.

Note that the initial sealing level of DS1922L 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


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