COMET W3745 – WiFi Sensor for 4 External Temperature/Humidity Probes

COMET W3745 WiFi T+RH Sensor 4 external probes 

The COMET W3745 is a powerful WiFi sensor for measuring temperature and relative humidity using up to four external Digi/E probes – the ideal solution for precise, wireless multi-point climate monitoring in warehouses, greenhouses, server rooms, museums, production halls, cold chains, or anywhere multiple measurement points need to be monitored via WiFi connectivity. The external probes (optional accessories) allow flexible placement in hard-to-reach, extreme, or distributed areas while keeping the main unit protected.

Simply place it, connect to WiFi – and the W3745 automatically sends measurements from all four channels to the COMET Cloud (from a 5-minute interval) or to your own system. The maintenance-free sensor measures with high accuracy and calculates dew point, absolute humidity, specific humidity, mixing ratio, and specific enthalpy. If a threshold is exceeded on one or more channels, the sensor triggers an alert via email, acoustic signal, or visually on the LCD display – with two freely adjustable alarm limits per channel.

Values can be displayed via integrated web pages or forwarded to third-party systems using Modbus TCP, SNMP, JSON, or XML. With the free COMET Cloud service (3 months free, then 1 credit/year), you get a complete monitoring solution without your own server: graphs, exports, alarms, and remote access via app or browser.

The robust housing, large LCD display, and simple configuration via WPS or web interface make the W3745 the ideal multi-channel sensor for smart building, Industry 4.0, and professional monitoring – made by COMET.

Why the COMET W3745 is the No. 1 choice for 4-channel climate monitoring:

• 4 external Digi/E probes – flexible for different measuring points
• WiFi connection – uses existing infrastructure
• COMET Cloud included – 3 months free, then low-cost credit
• Protocols: Modbus TCP, SNMP, JSON, XML – open for third-party systems
• Email alarm + acoustic/visual alerts – immediate notification per channel
• Large LCD display – local display of all channels
• Precise measurement – accuracy depends on the probe
• Dew point and all humidity parameters integrated
• Easy configuration – WPS or web interface
• 3-year warranty

Technical data:

• Temperature measuring range: depends on the connected Digi/E probe
• Temperature accuracy: depends on the probe
• Temperature resolution: 0.1 °C
• Humidity measuring range: depends on the connected Digi/E probe
• Humidity accuracy: depends on the probe
• Humidity resolution: 0.1 %RH
• Dew point: depends on the probe
• WiFi: 2.4 GHz, IEEE 802.11 b/g/n
• Cloud interval: adjustable from 5 minutes to 12 hours
• Protocols: HTTP(S), SMTP, Modbus TCP, SNMP (v1,v2c,v3), HTTP POST/GET (JSON, XML)
• Alarm: Email, acoustic (buzzer), visual (LED/display)
• Display: LCD with backlight
• Power supply: mains adapter (included)
• Operating temperature: –30 to +60 °C
• Protection rating: IP30
• Warranty: 3 years

Perfect for:

• Multi-point monitoring in warehouses and cold chains
• Server rooms and data centers (multiple zones)
• Museums, archives, and libraries
• Greenhouses and agriculture
• Offices, schools, kindergartens
• Pharmaceutical storage and cold rooms
• Production areas and quality control
• Industry 4.0 and IoT applications

Setup – done in minutes

Connect the sensor, attach the probes, connect to WiFi (WPS or app), activate COMET Cloud – done. Measurement data from all four channels are automatically uploaded to the cloud or your own system.

Summary:

• Sensors with WiFi interface measure temperature and relative humidity via a connected probe (optional accessory) as well as temperature from up to three connected Pt1000 probes (optional accessories).
• Communication with the sensor is wireless via WiFi.
• The device allows sending of data to the COMET Cloud (minimum interval of 5 minutes) or to the COMET database.
• Values can be displayed on integrated web pages and transmitted to third-party systems via Modbus TCP, SNMP, JSON, and XML.
• Measured data are displayed on the LCD screen.

Scope of delivery:

• W3745
• User manual
• Traceable calibration certificate
• Power adapter
• USB-C cable
• COMET Cloud for 3 months
• EXTERNAL PROBES NOT INCLUDED (optional accessories)