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Temperature measuring and recording device from Dueltek Computer Products

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article image DS1921G Thermochron iButton

DS1921G Thermochron iButton from Dueltek Computer Products is a tiny, battery-powered (ten year life) temperature (-40°C to +85°C) measuring and recording device.

DS1921G Thermochron iButton incorporates a direct-to-digital temperature sensor, a Y2K-compliant real-time clock calendar, lithium battery and non-volatile memory in a 16mm diameter water-resistant, rugged stainless steel enclosure.

DS1921G Thermochron iButton can be dropped, stepped on, generally mistreated and still continue to record its own temperature for years.

DS1921G Thermochron iButton seems ideal for any product that would require a time-temperature history for safety or quality assurance reasons such as produce storage, frozen food transport plant nurseries, laboratories, etc.

The DS1921G 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 63 data bins with a resolution of 2.0°C.

If the temperature leaves a user-programmable range, the DS1921G 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 DS1921G is associated. Data is transferred serially via the 1-Wire protocol, which requires only a single data lead and a ground return.

Every DS1921G Thermochron iButton 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 DS1921G Thermochron iButton to be mounted on almost any object, including containers, pallets, and bags.

Key features:

  • Digital thermometer measures temperature 0.5°C increments
  • Accuracy ±1°C from -30°C to +70°C. See EC table for accuracy specification
  • Built-in real-time clock (RTC) and timer has accuracy of ±2 minutes per month 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 non-volatile (NV) random access 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 random access memory
  • Communicates to host with a single digital signal at 15.4kbits or 125kbits per second 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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