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Relative Humidity Sensors & Transmitters for Industrial Monitoring

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COMET relative humidity sensors and transmitters for HVAC, food & pharma, cleanroom and compressed-air monitoring — capacitive RH sensing with a choice of RS232, RS485, Ethernet, PoE, WiFi, 4-20mA or 0-10V output.
Need a bare replacement probe instead of a complete unit? See our Temperature & Humidity Probes.
Need dew point or CO2 measured alongside humidity? See our Dew Point Sensors and CO2 Sensors.
Need a portable logging instrument instead of a fixed installation? See our Temperature & Humidity Data Loggers.

COMET relative humidity sensors and transmitters for HVAC, food & pharma, cleanroom and...

  • COMET H3060 temperature and humidity regulator with 230Vac/8A output relays.

    COMET H3060 | Humidistat, Thermostat with two relay outputs

    0 - 0 reviews

    Temperature and humidity regulator with 230Vac/8A…

    $ 985.00 Ex. GST     Add to cart
  • COMET H3061 temperature and humidity regulator with 230Vac/8A relays.

    COMET H3061 | Humidistat, Thermostat with two relay outputs

    0 - 0 reviews

    Temperature and humidity regulator with 230Vac/8A…

    Price range: $ 1,037.50 through $ 1,095.00 Ex. GST     Select options This product has multiple variants. The options may be chosen on the product page
  • COMET H3530 Ethernet temperature and humidity sensor with three dry contact inputs and two relay outputs.

    COMET H3530 | Ethernet Temperature & Humidity Sensor with 3 Dry Contact Inputs & 2 Relays

    0 - 0 reviews

    Thermometer hygrometer with Ethernet interface an…

    $ 1,115.56 Ex. GST     Add to cart
  • COMET H3531 Ethernet temperature and humidity sensor on remote probe cable with three dry contact inputs and two relay outputs.

    COMET H3531 | Ethernet Temperature & Humidity Sensor with Dry Contact Inputs & Relays — Remote Probe

    0 - 0 reviews

    Thermometer Hygrometer with Ethernet interface an…

    Price range: $ 1,200.00 through $ 1,249.50 Ex. GST     Select options This product has multiple variants. The options may be chosen on the product page
  • COMET H3531P Ethernet compressed-air temperature, humidity and dew point sensor with three dry contact inputs and two relay outputs.

    COMET H3531P | Ethernet Compressed-Air Temperature, Humidity & Dew Point Sensor with Dry Contact Inputs & Relays

    0 - 0 reviews

    Compressed-air thermometer hygrometer with Ethern…

    Price range: $ 1,505.00 through $ 1,565.00 Ex. GST     Select options This product has multiple variants. The options may be chosen on the product page
  • COMET H3531R rack-mount Ethernet temperature and humidity sensor with three dry contact inputs and two relay outputs.

    COMET H3531R | Ethernet Temperature & Humidity Sensor with Dry Contact Inputs & Relays — Rack-Mount

    0 - 0 reviews

    Rack mount thermometer hygrometer with Ethernet i…

    Price range: $ 1,265.00 through $ 1,319.50 Ex. GST     Select options This product has multiple variants. The options may be chosen on the product page
  • COMET H6020 temperature, humidity, CO2 transmitter with two relay outputs.

    COMET H6020 | Temperature, Humidity & CO2 Transmitter with Relay Outputs

    0 - 0 reviews

    Temperature, humidity, CO2 transmitter…

    $ 1,215.00 Ex. GST     Add to cart
  • COMET H3331 RS232 temperature and humidity regulator with three dry contact inputs and relay outputs.

    COMET H3331 | RS232 Temperature & Humidity Regulator with 3 Dry Contact Inputs

    0 - 0 reviews

    Temperature and humidity regulator with RS232 out…

    Price range: $ 929.44 through $ 987.78 Ex. GST     Select options This product has multiple variants. The options may be chosen on the product page
  • COMET H7531 Ethernet temperature, humidity and barometric pressure transmitter with three dry contact inputs, relay outputs and remote probe.

    COMET H7531 | Ethernet Temperature, Humidity & Barometric Pressure Transmitter with Dry Contact Inputs & Relays — Remote Probe

    0 - 0 reviews

    Thermometer hygrometer barometer with Ethernet in…

    Price range: $ 1,375.00 through $ 1,435.00 Ex. GST     Select options This product has multiple variants. The options may be chosen on the product page
  • COMET H6320 RS232 Temperature, Humidity and CO2 Transmitter with Relay Outputs

    COMET H6320 | RS232 Temperature, Humidity & CO2 Transmitter with Relay Outputs

    0 - 0 reviews

    Temperature, humidity, CO2 transmitter…

    $ 1,279.50 Ex. GST     Add to cart
  • COMET P8653 PoE temperature and humidity sensor with LD-81 flood detector and three dry contact binary inputs.

    COMET P8653 | PoE Temperature & Humidity Sensor with Flood Detector & 3 Dry Contact Inputs

    0 - 0 reviews

    Web Sensor with PoE, two channels with flood dete…

    $ 659.50 Ex. GST     Add to cart
  • COMET W3745 WiFi temperature and relative humidity sensor for 3 x Pt1000 and 1 x T+RH external probes.

    COMET W3745 | WiFi Temperature & Humidity Sensor — 4-Probe (1 x T+RH + 3× Temperature)

    0 - 0 reviews

    Wi-Fi temperature and relative humidity sensor fo…

    $ 1,047.50 Ex. GST     Select options
  • COMET H3021P compressed air temperature and humidity regulator with 2 relay outputs.

    COMET H3021P | Compressed Air Temperature & Humidity Regulator

    0 - 0 reviews

    Compressed air temperature and humidity regulator…

    Price range: $ 1,205.00 through $ 1,262.50 Ex. GST     Select options This product has multiple variants. The options may be chosen on the product page
  • Comet H3061P compressed air temperature and humidity regulator with 230Vac/8A relays.

    COMET H3061P | Temperature & Humidity Regulator, 230Vac/8A Relay Outputs

    0 - 0 reviews

    Compressed air temperature and humidity regulator…

    Price range: $ 1,386.50 through $ 1,445.00 Ex. GST     Select options This product has multiple variants. The options may be chosen on the product page
  • COMET T3111 temperature and Humidity transmitter with 4-20mA output.

    COMET T3111 | 4-20mA Temperature & Humidity Transmitter

    0 - 0 reviews

    Humidity, temperature transmitter. Outdoor, indoo…

    Price range: $ 682.50 through $ 739.50 Ex. GST     Select options This product has multiple variants. The options may be chosen on the product page
  • COMET T0210 temperature and humidity transmitter with 0-10V output.

    COMET T0210 | 0-10V Temperature & Humidity Transmitter

    0 - 0 reviews

    Ambient temperature, relative humidity transmitte…

    $ 635.00 Ex. GST     Add to cart
  • COMET T3113 4-20mA Temperature & Humidity Transmitter - Duct Mount

    COMET T3113 | 4-20mA Temperature & Humidity Transmitter - Duct Mount

    0 - 0 reviews

    Temperature and Humidity 4-20mA output

    $ 675.00 Ex. GST     Add to cart
  • Sale! COMET T3610 ambient temperature, relative humidity t-line Web sensor with Power over Ethernet feature.

    COMET T3610 | PoE Temperature & Humidity Sensor

    0 - 0 reviews

    Web Sensor with PoE – Remote thermometer hy…

    Original price was: $ 967.50.Current price is: $ 870.75. Ex. GST     Select options
  • COMET TA3610 compact PoE temperature and humidity sensor with LCD display and built-in sensor stem

    COMET TA3610 | PoE Temperature & Humidity Sensor — Compact with LCD Display

    0 - 0 reviews
    $ 1,136.50 Ex. GST     Add to cart
  • Sale! COMET T3611 PoE temperature and humidity sensor with remote probe.

    COMET T3611 | PoE Temperature & Humidity Sensor — Remote Probe

    0 - 0 reviews

    Web Sensor with PoE – remote thermometer hygrom…

    Original price was: $ 995.00.Current price is: $ 895.50. Ex. GST     Add to cart

    • How a Relative Humidity Sensor Works

    COMET humidity sensors use a capacitive sensing element — a thin polymer film whose electrical capacitance changes as it absorbs or releases moisture from the surrounding air. This gives stable, drift-resistant readings across the 0–100% RH range, paired in every product on this page with a temperature sensor for combined T+RH output.

    Choosing an Output Type

    This range covers every signal type PST supplies: 4-20mA and 0-10V for direct PLC/BMS analogue inputs, RS232 and RS485 for serial/Modbus networks, and Ethernet, PoE or WiFi for networked installations. See our dedicated RS232, RS485, Ethernet, PoE, WiFi and 4-20mA/0-10V transmitter ranges if you’re starting from the output type rather than the parameter.

    Humidistats & Relay Control

    For direct control rather than monitoring alone, the COMET H3060, H3061, H3331 and H6020 combine humidity sensing with built-in relay outputs — switching fans, dehumidifiers or HVAC equipment directly from a humidity setpoint without a separate controller.

    Mounting & Application Options

    Duct-mount (T3113D, T3413D, T6445, T0213D), wall-mount (T6440), remote-probe and compressed-air (T3511P, H3531P, T0211P, T3419P) variants are available across most output types — check the individual product page for the mounting style that matches your installation. Intrinsically safe ATEX models (T3110Ex, T3111Ex, T3113Ex) are available for hazardous-area monitoring.

    Need a Different Format?

    For a bare replacement probe rather than a complete transmitter, see our Temperature & Humidity Probes. For a portable logging instrument, see our Temperature & Humidity Data Loggers. For a handheld meter, see our COMET and CENTER humidity meters listed in this range.