The DS1921L Thermochron® iButtons® are rugged, self-sufficient systems that measure temperature and record 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 63 data bins for a resolution of 2.0°C. If the temperature leaves a user-programmable range, the DS1921L 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. An additional 512 bytes of read/write NV memory allow storing information pertaining to the object to which the DS1921L is associated. Data is transferred serially via the 1-Wire® protocol, which requires only a single data lead and a ground return. Every DS1921L 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 DS1921L to be mounted on almost any object, including containers, pallets, and bags.
Key Features
Digital Thermometer Measures Temperature in 0.5°C Increments
Built-In Real-Time Clock (RTC) and Timer has Accuracy of ±2 Minutes per Month from 0°C to 45°C
Automatically Wakes Up and Measures Temperature at User-Programmable Intervals From 1 to 255 Minutes
Logs up to 2048 consecutive temperature measurements in protected nonvolatile (NV) memory
Records a Long-Term Temperature Histogram With 2.0°C Resolution
Programmable Temperature-High and Temperature-Low Alarm Trip Points
Records Up to 24 Time Stamps and Durations when Temperature Leaves the Range Specified by the Trip Points
512 Bytes of General-Purpose Read/Write NV Memory
Communicates to Host with a Single Digital Signal at 14.1kb or 125kbps Using 1-Wire Protocol
COMMON iButton FEATURES
Digital Identification and Information by Momentary Contact
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 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 (application pending)
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