COMET H3020 – Temperature & Humidity Controller with Integrated Sensors, 2 Relays

COMET H3020 – Temperature & Humidity Controller with integrated sensors –30 to +80 °C / 0–100 %RH, dew point, 2 relays (50 V/2 A), IP65

The COMET H3020 is a compact and reliable temperature and humidity controller (humidistat + thermostat) with integrated sensors and two relay outputs – the ideal solution for precise climate control in warehouses, cold rooms, greenhouses, drying systems, technical centers, server rooms, or production areas. With IP65 protection and an acoustic alarm (switchable), it is perfectly suited for both indoor and outdoor use (–30 to +80 °C), wherever temperature and humidity need to be actively controlled or monitored – without external probes and without cloud dependency.

The internal sensor measures temperature from –30 to +80 °C (±0.4 °C) and relative humidity from 0 to 100 %RH (±2.5 %RH from 5–95 % at 23 °C). The dew point is calculated with high accuracy (±1.5 °C at T<25 °C and RH>30 %). In addition, all other humidity parameters are available: absolute humidity, specific humidity, mixing ratio, and specific enthalpy. The large dual-line LCD displays all measured values and relay status. The two relay outputs (max. 50 V / 2 A / 60 VA) can be freely programmed based on temperature, humidity, or dew point thresholds – ideal for direct control of fans, heaters, dehumidifiers, alarms, or compressors.

The robust IP65 housing protects against dust and water jets – ideal for humid or dusty environments. The acoustic alarm (buzzer) warns in case of limit violations and can be deactivated. Power supply 9–30 V DC – simple and flexible. The controller is maintenance-free, long-term stable, and available with a traceable calibration certificate (according to EN ISO/IEC 17025) – ensuring top quality for critical applications. No Ethernet or cloud required – a pure stand-alone controller with relays and alarm.

Why the COMET H3020 is the professional T+RH controller:

• 2 relay outputs – 50 V / 2 A / 60 VA – for direct control
• Integrated sensors – no external probe required
• 3-in-1: temperature + humidity + dew point – all humidity parameters available
• High accuracy – Temp. ±0.4 °C | Humidity ±2.5 %RH | Dew point ±1.5 °C
• Acoustic alarm – switchable buzzer for limit exceedance
• IP65 housing – weatherproof for indoor & outdoor use
• Large dual-line LCD – displays readings & relay status
• Wide power supply range – 9–30 V DC
• Long-term stable & maintenance-free – with calibration certificate

Technical data H3020:

• Temperature range: –30 to +80 °C (±0.4 °C)
• Humidity range: 0 to 100 %RH (±2.5 %RH from 5–95 % at 23 °C)
• Dew point: –60 to +80 °C (±1.5 °C at T<25 °C and RH>30 %)
• Relays: 2 × max. 50 V / 2 A / 60 VA
• Resolution: 0.1 °C / 0.1 %RH
• Power supply: 9–30 V DC
• Operating temperature: –30 to +80 °C
• Protection class: IP65 (electronics), IP40 (sensor)
• Dimensions: 136 × 213 × 45 mm; probe length 75 mm
• Weight: approx. 350 g
• Warranty: 3 years

Perfect for:

• Warehouses & cold rooms (climate monitoring)
• Greenhouses & agriculture
• Drying & ventilation systems
• Server rooms & technical centers
• Direct control of fans / dehumidifiers
• Alarm & limit monitoring
• Stand-alone control without cloud
• Humidity & temperature regulation in damp environments

Installation & commissioning – done in minutes

Mount the unit on a wall or pole, connect power (9–30 V DC) and relays – done! Set thresholds using the buttons and LCD or fine‑tune them via PC software. No calibration required when replacing the device.

Summary

• Humidistat with two relay outputs
• For indoor and outdoor environments
• Integrated sensors for relative humidity and temperature
• Measured values are converted into additional humidity parameters: dew point temperature, absolute humidity, specific humidity, mixing ratio, and specific enthalpy.

Scope of delivery:

• H3020
• User manual
• Traceable calibration certificate
• Free TSensor software for transmitter configuration