IButton DS1923 Hygrochron Temperature/Humidity Data Logger

The DS1923 temperature/humidity logger iButton^® is a rugged, self-sufficient system that measures temperature and/or humidity and records the result in a protected memory section. The recording is done at a user-defined 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 application-specific 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 DS1923 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 DS1923 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 DS1923 to be mounted on almost any object, including containers, pallets and bags.

• Digital Hygrometer Measures Humidity with 8-Bit (0.6%RH) or 12-Bit (0.04%RH) Resolution
• Operating Range: -20°C to +85°C; 0 to 100%RH (see Safe Operating Range Graph in the full data sheet)
• Automatically Wakes Up, Measures Temperature and/or Humidity and Stores Values in 8KB of Datalog Memory in 8- or 16-Bit Format
• Digital Thermometer Measures Temperature with 8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution
• Temperature Accuracy Better than ±0.5°C from -10°C to +65°C with Software Correction
• Built-in Humidity Sensor for Simultaneous Temperature and Humidity Logging
• Capacitive Polymer Humidity-Sensing Element
• Hydrophobic Filter Protects Sensor Against Dust, Dirt, Contaminants, and Water Droplets/Condensation
• Sampling Rate from 1s up to 273hrs
• Programmable Recording Start Delay After Elapsed Time or Upon a Temperature Alarm Trip Point
• Programmable High and Low Trip Points for Temperature and Humidity Alarms
• Quick Access to Alarmed Devices Through 1-Wire Conditional Search Function
• 512 Bytes of General-Purpose Memory 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
• Individually Calibrated in a NIST-Traceable Chamber
• Calibration Coefficients for Temperature and Humidity Factory Programmed into Nonvolatile (NV) Memory
• Meets UL 913, 5th Ed., Rev. 1997-02-24; Intrinsically Safe Apparatus, Approved under Entity Concept for use in Class I, Division 1, Group A, B, C, and D Locations
• Underwriters Laboratories (UL) Recognized

• Memory Type: NVSRAM
• Memory Size: 512 bytes
• Data Logger Size: 8192 byte
• Data Logger Sample Rate: 1s to 273 hours
• Data Logger Accuracy: correctible to +/- 0.5’C
• Data Logger Resolution: Selectable
  8-bit = 0.5’C
  11-bit = 0.0625’C
• Measurement Range - Temperature:  -20 to +85’C
• Measurement Range - Humidity: 0 to 100% RH
• Security Features: password protected
• Programmable Alarm: Temperature High/Low, Humidity High/Low
• Real Time Clock: Yes
• Weight: 5g
• Size: diameter 17.35 x 5.9mm
• IP Rating: IP56
• Battery Life: depends on number of factors such as Temperature and Logging rate. E.g. 8-bit logging @ 20’C at 30 second intervals, the battery should last around 300 days. Record every 10 minutes in 8-bit mode @ 20’C, the battery should last around 5.5 years. 

i-button datalogger catalogue

• Environmental Studies/Monitoring
• Temperature and Humidity Logging in Food Preparation and Processing
• Transportation of Temperature- and Humidity-Sensitive Goods, Industrial Production
• Warehouse Monitoring