DS1922T Temperature Data Logger iButton (0 to +125°C)

Interface and identification

Setup and data transfer use the 1-Wire® serial protocol, so the logger needs only one data lead plus a ground return to talk to a host computer. A unique 64-bit registration number is laser-etched into every DS1922T at the factory, which gives full traceability. The stainless-steel package stands up well to dirt, moisture and shock, and mounting accessories let you attach the DS1922T to nearly any object, from containers and pallets to bags.

Key features

• Wakes up on its own, takes the temperature and stores values in 8KB of datalog memory, in 8- or 16-bit format
• Digital thermometer with 8-bit (0.5°C) or 11-bit (0.0625°C) resolution
• ±0.5°C accuracy between +20°C and +75°C with software correction
• Water resistant; becomes waterproof inside the DS9107 iButton capsule (beyond the Water Resistant 3 ATM requirement)
• Sampling interval from 1s up to 273hrs
• Recording start can be delayed by an elapsed time or held until a temperature alarm trip point
• Programmable high and low alarm trip points
• 1-Wire conditional search finds alarmed devices quickly
• 512 bytes of general-purpose memory plus 64 bytes of calibration memory
• Two-level password protection on all memory and configuration registers
• Single digital signal to the host at up to 15.4kbps at standard speed or up to 125kbps in Overdrive mode, over the 1-Wire protocol
• Operating range: 0 to +125°C

Features shared by all iButtons

• Digital ID and information exchanged through momentary contact.
• No two parts share the same factory-lasered 64-bit registration number, so device selection is error-free and traceability is absolute.
• On-board multidrop controller for 1-Wire networks.
• A chip-based data carrier keeps information in a compact form.
• Data can be read while the button stays attached to the object.
• The button shape self-aligns with cup-shaped probes.
• The stainless-steel case, engraved with the registration number, withstands harsh environments.
• Attaches easily with a self-stick adhesive backing, by its flange, or with a ring pressed onto its rim.
• A presence detector signals when a reader first applies voltage.
• Meets UL#913 (4th Edit.); intrinsically safe apparatus approved under the Entity Concept for Class I, Division 1, Group A, B, C and D locations.

Where it fits

Because its temperature range is shifted, the DS1922T suits processes that run close to the boiling point of water, such as food pasteurization.

The DS1922T leaves the factory sealed to the equivalent of IP56. Ageing and service conditions can wear down that seal over time, so where the logger will face significant exposure to liquids, sprays or similar conditions, placing the Thermochron inside the DS9107 iButton capsule is recommended.