The DS1923 iButton® Temperature/Humidity Logger is a robust, self-sufficient system that measures temperature and/or humidity and records the result in a protected memory section. Recording is done at a user-defined pace. A total of 8192 8-bit readings or 4096 16-bit readings taken at equidistant intervals ranging from 1 second to 273 hours can be stored. In addition to this, there are 512 bytes of SRAM to store application-specific information and 64 bytes for calibration data. A data collection mission can be scheduled to start immediately, or after a user-defined delay or after a temperature alarm. Access to memory and control functions can be password protected.
The DS1923 is configured and communicates with a host computing device via the 1-Wire serial protocol, which requires only one data cable and a ground return. Each DS1923 comes factory laser engraved with a guaranteed unique 64-bit registration number allowing for absolute traceability. The durable stainless steel package is highly resistant to environmental hazards such as dirt, moisture and impact. Accessories allow the DS1923 to be mounted to almost any object, including containers, pallets and bags.
Characteristics
Operating range: -20 to +85°C; 0 to 100% RH (see Safe Operating Range in data sheet)
The digital hygrometer measures humidity with a resolution of 0.6% RH or 0.04% RH
Automatically activates, measures temperature and/or humidity and stores up to 8192 values in 8 KB of data logging memory
The digital thermometer measures temperature with a resolution of 0.5°C or 0.0625°C
Temperature accuracy Better than ±0.5°C from -10°C to +65°C with software correction
Sampling rate from 1 s to 273 h
Built-in humidity sensor for simultaneous recording of temperature and humidity
Capacitive polymer humidity sensing element Hydrophobic filter protects sensor from dust, dirt, contaminants and water droplets/condensation
Programmable recording start delay after elapsed time or after a temperature alarm trigger point
Programmable high and low trip points for temperature and humidity alarms
Quick access to alarmed devices via 1-Wire® conditional search function
512 bytes of general purpose memory plus 64 bytes of calibration memory
Two-level password protection for all memory and configuration records
Communicates with the host with a single digital signal at up to 15.4 kbps at standard speed or up to 125 kbps in Overdrive mode using the 1-wire protocol
Common iButton Functions
Digital identification and information by momentary contact.
The unique factory laser-etched 64-bit registration number ensures error-free device selection and absolute traceability because no two parts are the same.
Built-in multipoint controller for 1-Wire network.
The chip-based data carrier stores information compactly.
Data can be accessed while attached to the object.
The button shape automatically aligns with cup-shaped probes.
Durable stainless steel case engraved with registration number that withstands harsh environments.
It attaches easily with a self-adhesive adhesive backing, locks via its flange, or locks with a ring pressed into its edge.
The presence detector recognizes when the reader applies voltage for the first time.
Complies with UL#913 (4th edition); Intrinsically Safe Appliance: Entity approved for use in Class I, Division 1, Group A, B, C and D locations.
Application
The DS1923 is an ideal device for long-term monitoring of the temperature and humidity of any object it is attached to or shipped with, such as fresh produce, medications and medical supplies and for use in refrigerators and freezers, as well as for recording climatic data during the transport of sensitive objects and critical processes such as curing. A 1.27 mm diameter hole in the device lid allows air to reach the humidity sensor. The rest of the electronics inside the DS1923 are sealed so they are not exposed to ambient moisture.
Please note that the initial sealing level of DS1923 reaches IP56. Conditions of aging and use can degrade seal integrity over time, so for applications with significant exposure to liquids, aerosols, or other similar environments, it is recommended that the Hygrochron be placed under a shield to protect it (see data sheet ).
Aplicativo
O DS1923 é um dispositivo ideal para monitoramento de longo prazo da temperatura e umidade de qualquer objeto ao qual seja anexado ou transportado, como produtos frescos, medicamentos e suprimentos médicos, e para uso em refrigeradores e freezers, bem como para registrar condições climáticas. dados durante o transporte de objetos sensíveis e processos críticos, como a cura. Um orifício de 1,27 mm de diâmetro na tampa do dispositivo permite que o ar chegue ao sensor de umidade. O restante dos componentes eletrônicos dentro do DS1923 são vedados para não serem expostos à umidade ambiente.
Observe que o nível de vedação inicial do DS1923 atinge IP56. As condições de envelhecimento e uso podem degradar a integridade da vedação ao longo do tempo, portanto, para aplicações com exposição significativa a líquidos, aerossóis ou outros ambientes semelhantes, recomenda-se que o Hygrochron seja colocado sob uma proteção para protegê-lo (consulte a folha de dados).
