WiFi Temperature and Relative Humidity Sensor for 4 External Probes W3745 Comet System

Smart monitoring, seamless connectivity

With built-in WiFi connectivity, the sensor is incredibly easy to deploy — simply connect to an existing WiFi network. No additional infrastructure required. Perfect for facilities where wireless networks are already in place.

Advanced communication and integration
Measured data can be automatically transmitted to the COMET Cloud at adjustable intervals starting from just 5 minutes, or stored in the COMET Database. Measurements can also be accessed through integrated web pages and seamlessly integrated into third-party systems using Modbus TCP, SNMP, JSON, or XML protocols.

Real-time alarms
The device continuously evaluates measurement values against predefined limits. If any threshold is exceeded, the sensor can instantly trigger alerts via email, acoustic alarm, or LED indicator. Each measurement channel supports two configurable alarm levels.

Versatile across multiple sectors
The WiFi sensor is ideal for a broad range of industries — including food and beverage, pharmaceuticals, data centres, laboratories, warehouses, and technical installations. Its precision and reliability make it an essential tool wherever continuous environmental monitoring is a priority.

Technical Specifications

• Temperature & Humidity Sensor (Digi/E probe):
  • Measuring range: based on connected probe
  • Resolution: 0.1 °C / 0.1 % RH
  • Accuracy: defined by probe specification
• External Pt1000 Temperature Probes:
  • Measuring range: -90 to +260 °C (optionally -150 to +600 °C)
  • Accuracy: ±0.2 °C from -90 to +100 °C; ±0.2 % of reading from +100 to +260 °C
  • Resolution: 0.1 °C
• Dew Point:
  • Measuring range & accuracy: based on Digi/E probe
• General Information:
  • Operating temperature: -30 to +60 °C
  • Channels: 1x temp+humidity probe (ELKA), 3x Pt1000 temp probes (CINCH)
  • Measurement interval: 1 second
  • Transmission interval to COMET Cloud: 5 min to 12 hours
  • Protocols: HTTP(S), SMTP, Modbus TCP, SNMP (v1, v2c, v3), HTTP POST, HTTP GET (JSON, XML)
  • Alarms: email, acoustic signal, LED indicator
  • Power: 5.0–5.4 VDC; 150 mA typical (max. 500 mA); USB-C connector
  • Wireless frequency: 2.4 GHz; max. transmit power 18 dBm; standard: IEEE 802.11 b/g/n
  • WiFi security: Open, WEP, WPA, WPA2, WPA3, WPA2-EAP, WPA2-PMF
  • Protection class: IP30
  • Dimensions: 133 x 93 x 32 mm
  • Weight: 117 g
  • Warranty: 3 years

The COMET WiFi sensor combines precision, versatility, and robust connectivity — the ultimate solution for hassle-free environmental monitoring.

View COMET Cloud:

COMET Cloud