Monnit's ALTA wireless humidity sensors allow you to monitor the relative humidity of the air within a room or enclosure. Ideal for monitoring humidity within greenhouses, industrial spaces, museums, saunas and humidors. They can also be used for residential applications such as controlling mold, mildew or dust mites.
ALTA sensors offer 3 to 4 times the range of standard sensor platforms, extending non-line-of-sight reach to an exceptional 1,200+ feet through walls (12-14 walls typical). Using Frequency-hopping Spread Spectrum (FHSS) also allows ALTA sensors to have better interference immunity from other wireless devices.
Superior power management provides ALTA sensors with almost twice the battery life of Monnit’s standard wireless sensors.
Integrated on-board data storage allows ALTA sensors to store data messages if communication to a wireless gateway is disrupted (power outage, Internet outage, or out of range). Messages that can’t be delivered will be time-stamped and stored in memory (up to the last 512 messages) until communication with the gateway is restored, at which point the messages will all be transmitted.
Over-the-air updates allow ALTA products to be updated remotely if new fixes or features become available.
The standard version of this sensor is powered by two replaceable 1.5 V AA sized batteries (included with purchase). This sensor is also available with a line power option. The line powered version of this sensor has a barrel power connector allowing it to be powered by a standard 3.0 - 3.8 V power supply (Included with Line Power option upgrade). The line powered version also uses two standard 1.5 V AA batteries as backup for uninterrupted operation in the event of line power outage.
Power options must be selected at time of purchase, as the internal hardware of the sensor must be changed to support the selected power requirements.
The sensor shows best performance when operated within recommended normal temperature and humidity range of 5°C– 60°C and 20%RH – 80%RH, respectively. Long-term exposure to conditions outside normal range, especially at high humidity, may temporarily offset the RH signal (e.g. +3%RH after 60h kept at >80%RH). After returning into the normal temperature and humidity range the sensor will slowly come back to calibration state by itself. Prolonged exposure to extreme conditions may accelerate ageing.
* Actual range may vary depending on environment.
** Battery life is determined by sensor reporting frequency and other variables.
Humidity Sensor Specifications
|Accuracy||± 3% under normal conditions ( 10% - 90% RH )|
|RH Operating Range||0 – 100% RH|
|RH Response Time||8 sec ( tau 63% )|
|Security||Encrypt-RF® (256-bit key exchange and AES-128 CTR)|
ALTA AA Specifications
|Battery Type||2 Replaceable AA 1.5 V Batteries|
|Dimension||4.375 in x 2.470 in x 1.12 in|
|Supply Voltage||2.0 - 3.8 V (2 x AA 1.5V Batteries or Optional Power Supply)|
|Battery Life||At 1 hour heartbeat setting, included AA batteries will typically last 6-8 Years. **|
|Max Operating Temperature Using AA Alkaline||-18°C to 55°C (0°F to 130°F)|
|Max Operating Temperature Using AA Lithium||-40°C to 60°C (-40°F to 140°F)|
|Optimal Battery Operating Temperature||+10°C to +50°C (+50°F to +122°F)|
ALTA 868 MHz Specifications
|Operating Frequency||868 MHz Operating Frequency|
|Certifications||CE Certified. Tested and found to comply with: EN 300 220-2 V3.1.1 (2017-02), EN 300 220-2 V3.1.1 (2017-02) and EN 60950.|
|Security||Encrypt-RF® (Diffie-Hellman Key Exchange + AES-128 CBC)|
|Device Range||Device Range Up to 1,200 ft. non-line-of-sight, wireless device range*|