Resistance
General Description
The ALTA® Wireless Resistance Sensor measures the resistance across a load. It can be connected to any kind of passive (no voltage) resistance load.
Key Features
Measures up to 250k Ohms
Accuracy: ± 2% FS with user calibration
Interfaces with any purely resistive and passive load
Configurable thresholds for critical condition monitoring
Principles of Operation
The ALTA Wireless Resistance Sensor reads the resistance across any resistive load on a user-configurable time interval or Heartbeat. The resistance sensor leads are meant to connect to passive devices only. Connecting the sensor leads to any voltage or power source may damage the sensor. On every Heartbeat, the sensor measures the resistance across its leads. This measurement is then sent to the gateway, making the data available in iMonnit or another approved data service.
Features of Monnit ALTA Sensors
Wireless range of 2,000+ feet through 18+ walls1
Frequency-Hopping Spread Spectrum (FHSS)
Best-in-class interference immunity
Best-in-class power management for longer battery life2
Encrypt-RF® Security (Diffie-Hellman Key Exchange + Advanced Encryption Standard (AES)-128 Cipher Block Chaining (CBC) for sensor data messages)
Sensor logs 2000 to 4000 readings if the gateway connection is lost (non-volatile flash, persists through power cycling):
10-minute Heartbeats = ~ 22 days
2-hour Heartbeats = ~ 266 days
Automatic over-the-air updates to sensor firmware (future-proof)
Free iMonnit Basic Online Wireless Sensor Monitoring and Notification System to configure sensors, view data, and send alerts via SMS text, email, and voice call
1 Actual range may vary depending on the environment and gateway.
2 Battery life is determined by the sensor reporting frequency and other variables. Other power options are also available
