Relative humidity and temperature sensor ARF827 series

wall-mountUSBNB-IoT

Product overview
The COMFORT IoT sensor lets you measure and analyse changes in temperature and humidity inside a room. Thanks to data transmitted by the device, facility managers can optimise ambient comfort and reduce energy consumption.

Highlights of the IoT sensor

• 4-in-1: temperature, humidity, alarm button, dry contact input
• Autonomy: over 15 years in some LoRaWAN configurations (varies by region and settings)
• Transmission modes: periodic and/or event-triggered
• Data logging and timestamping
• Local (USB-C) and remote configuration
• Compatible with KARE
• Radio variants: LoRaWAN (EU863-870, US902-928, AU915-928, AS923-1), Sigfox (RC1, RC2, RC4), NB‑IoT / LTE‑M

Features

• Periodic transmission of temperature and humidity (with optional logging) and transmission on threshold exceedance (high/low)
• Configurable redundancy (number of repeats per frame)
• 1 digital (dry) input to detect state changes and send associated frames
• 1 alert button to trigger event frames
• Configurable alarm repetition for persistent events
• Configurable life frame
• Local configuration via USB-C or remote configuration over the network (periodicity, transmission modes, alarm thresholds)
• Alerts for product error, configuration error and low battery

Actions / Alarms
Trigger an alarm if:

• high and/or low threshold(s) are exceeded
• the alert button is pressed
• an event is detected on the dry contact input

Monitoring / Counting

• Monitor temperature
• Monitor humidity level
• Count events from the alert button or the dry contact input

General specifications

• Dimensions: 111 x 61 x 40 mm
• Weight: 107 g
• Enclosure: IP20, Bayblend FR3010 (PC/ABS), white plastic (indoor use)
• Integrated wall mounting
• Operating conditions: +5°C to +50°C; 0 to 85% RH (non-condensing)
• Power: connectorized battery pack, 4000 mAh

Versions / Certification / Battery life (example figures)

• Part numbers (examples): ARF8275ARA (COMFORT LoRaWAN EU863-870), ARF8275A (COMFORT Sigfox RC1), ARF8275BRA (COMFORT LoRaWAN US902-928), ARF8275DRA (COMFORT Sigfox RC2), ARF8275JRA (COMFORT LoRaWAN AS923), ARF8275IRA (COMFORT LoRaWAN AU915-928), ARF8275KRA (COMFORT Sigfox RC4)
• Certifications: e.g. RED (2014/53/EU), FCC Part 15 (US), RSS-247 (Canada), AS/NZS 4268 (region dependent)
• Battery life examples (1 scan every 20 minutes, 1 transmission per hour = 24 frames/day):
  • LoRaWAN EU863-870: SF7: >15 years; SF12: 11.3 years
  • LoRaWAN US902-928: SF7: >15 years; SF12: >15 years
  • LoRaWAN AS923: SF7: >10.4 years; SF12: >9 years
  • Sigfox RC1: ~3.1 years
  • Sigfox RC2 / RC4: examples shown (varies by configuration)

Decoding / Documentation
Data decoding is supported via the manufacturer’s CODEC. Official product datasheets and technical reference manuals (including regional radio variants) are available as product documents.

Technical specifications

• Product: COMFORT IoT sensor (temperature, humidity, alarm button, dry contact input)
• Dimensions: 111 x 61 x 40 mm
• Weight: 107 g
• Enclosure: IP20 PC/ABS (Bayblend FR3010), indoor use
• Mounting: integrated wall fixing
• Battery: connectorized pack 4000 mAh
• Operating temp: +5°C to +50°C
• Operating humidity: 0 to 85% RH (non-condensing)
• Radio variants: LoRaWAN, Sigfox, NB‑IoT / LTE‑M
• Key functions: periodic and event-driven transmissions, data logging, local (USB-C) and remote configuration, alarm thresholds, redundancy, alerts for product/configuration/low battery