STM331

STM331 is a sensor transmitter module optimized for realization of wireless and maintenance free temperature sensors, or room operating panels including set point dial and occupancy button with a minimum number of external components. The module provides an integrated calibrated temperature sensor. Power supply is provided by a small solar cell or optional by an external 3V battery. An energy storage is installed to bridge periods of darkness. The module provides a user configurable cyclic wake up. After wake up a radio telegram will be transmitted in case of a significant change of measured temperature, the set point values or if the external occupancy button is pressed. It can be configured to use the enhanced secure mode.

• Radio regulations: RED (EU)
• STM 331: 868.3MHz frequency, helical antenna, back learn button
• Data rate/modulation type: 125Kbps / ASK (868MHz), FSK (902MHz)
• Radiated output power: +5dBm (EIRP) ±2.5dB
• Operation time in darkness at 25°C is min. 10 days, if energy storage fully charged
• Start up time w/ empty energy store is typ <2.5 min at 400lux/25°C incandescent or fluorescent light
• I/P ch: Internal(temperature sensor, LRN button) external(occupancy button, set point dial, HSM 100)
• Temperature sensor measurement range 0-40°C, resolution 0.16K