Seacom supplies humidity and temperature transmitters for HVAC, building automation, cleanrooms, laboratories and industrial processes. These instruments provide continuous measurements for controllers, building management systems and monitoring equipment.
Choose from wall-mounted, duct-mounted, outdoor and remote-probe designs. Depending on the model, available interfaces include 4–20 mA, voltage outputs, Modbus RTU and BACnet MS/TP. Select the instrument according to the installation conditions, required accuracy and control-system interface.
A humidity transmitter for HVAC should measure conditions at a location that represents the space or air stream being controlled. Room, duct and outdoor measurements serve different purposes and may require different probe arrangements and protective accessories.
| Application | Product family | Selection guidance |
|---|---|---|
| Routine room, duct and outdoor HVAC measurement | Vaisala HMW80, HMD80 and HMS80 | Consider this family for routine building automation. Select the mounting arrangement and analogue output to match the installation. |
| Higher-accuracy room, duct and outdoor measurement | Vaisala HMW110, HMD110 and HMS110 | Consider this family when accuracy and calibration documentation are important. Confirm the required output and model configuration. |
| Wall-mounted measurement in demanding indoor environments | Vaisala HMW90 Series | Humidity and temperature measurement for indoor HVAC applications requiring accuracy and stability. Confirm the display and output configuration. |
| Compact sensing and modular installations | Vaisala XMP10 Series | Compact probes with different sensor and accuracy options, for standalone use or compatible Origo10 transmitters. XMP10T measures temperature only. |
| Indoor air quality and ventilation monitoring | Vaisala XMW85 Series | Configurable indoor transmitters for CO₂, humidity and temperature. Confirm the measurements included in the selected configuration. |
| Accurate compact sensing for equipment and data loggers | Vaisala HMP110 | Compact HUMICAP humidity and temperature probe. Select the output, filter, cable and mounting accessories for the application. |
| Cost-conscious equipment integration and general monitoring | Vaisala HMP60 | Compact humidity and temperature probe with an interchangeable INTERCAP sensor. Confirm the required accuracy, operating conditions and output. |
| Demanding ventilation ducts and air-handling systems | Vaisala HMD60 Series | Consider this family for high-performance duct measurement. Analogue, Modbus RTU and BACnet MS/TP options depend on the model. |
| Modular wall-mounted or duct-mounted HVAC measurement | Vaisala Origo10 Series | Consider a modular system with interchangeable probes. Confirm the probe, measurement parameters and controller interface. |
The families above provide a starting point for HVAC selection. For environmental chambers, elevated temperatures, high humidity, pressurised processes or hazardous locations, review the specialised instruments below with Seacom before specifying a model.
When selecting a humidity sensor for a cleanroom or laboratory, consider measurement accuracy, long-term stability, calibration access and the location of the sensing point. The instrument must also suit the cleaning procedures and environmental conditions at that location.
A transmitter connected to a BMS or PLC provides measurement for control and indication. Applications requiring recorded history, alarms and reporting may also need a separate monitoring system. Sensor selection alone does not establish compliance with pharmaceutical or quality-system requirements.
Explore the humidity measurement range for related meters, probes and logging instruments.
Not every model supports every interface. Specify the complete model configuration rather than relying on the product-family name alone.
Position the sensor where airflow and conditions represent the intended measurement. Avoid local heat sources, stagnant pockets and direct water spray. Follow the selected manufacturer's guidance for mounting, orientation, wiring and environmental protection.
Plan access for inspection and calibration. The appropriate checking interval depends on the environment, required measurement confidence, instrument performance and the site's quality procedures.
A humidity sensor is the sensing element. A humidity transmitter combines sensing and signal-processing functions to provide an output that a controller or monitoring system can use. Some probes also contain their own processing electronics and digital interface.
Yes. Many transmitters measure both relative humidity and temperature. Selected models also provide calculated parameters such as dew point, wet-bulb temperature or enthalpy. Check the supported measurements and outputs for the chosen configuration.
Start with the measurement location: room, duct or outdoor air. Then compare accuracy, operating conditions, output interface and calibration requirements. Routine ventilation and critical controlled environments may require different instruments.
Do not assume that a standard HVAC transmitter is suitable. Very dry compressed air requires an instrument selected for the dew-point range, process pressure and sampling arrangement. See the dew point meters and transmitters for this application.
Planning measurements for server rooms or air-handling systems? Explore sensor placement, relative humidity, dew point and monitoring-system requirements.
Read our data centre humidity and temperature monitoring guide
For a broader guide to room, duct and outdoor measurement, explore Vaisala HVAC sensors and transmitters, including selection considerations for building-automation systems.
Read our Vaisala HVAC sensor and transmitter guide
Seacom Process Instruments is based in Malaysia, with offices in Kuala Lumpur and Penang. Our team can assist with industrial humidity transmitter selection, probe configuration, mounting accessories and control-system compatibility.
Send us the installation location, operating temperature and humidity, required accuracy, output signal and power supply. Include any calibration or documentation requirements so we can recommend a suitable configuration.
There are 32 products.
The Vaisala HMT360 Series was an intrinsically safe transmitter platform for humidity, temperature and moisture measurement in hazardous areas. It is discontinued and replaced by the Vaisala HMT370EX with an application-specific probe.
The Vaisala HMT330 Series was a flagship industrial transmitter platform for humidity, temperature and calculated moisture parameters. It is discontinued and replaced by an Indigo500 transmitter with the HMP probe selected for the application.
The Vaisala HMX110 Series provides accurate humidity and temperature measurement for demanding indoor, duct and outdoor HVAC applications.
The Vaisala HMDW80 Series provides cost-effective humidity and temperature measurement for routine HVAC and building-automation applications.
The Vaisala HMW90 Series provides high-accuracy humidity and temperature measurement for demanding indoor HVAC and controlled-environment applications.
The Vaisala HMT120 and HMT130 provide accurate, stable humidity and temperature measurement for cleanrooms, laboratories, data centres and demanding HVAC applications.
Product transition: HMT120/HMT130 are expected to be phased out. For new projects, the Vaisala Origo10 is the recommended replacement platform.
The Vaisala PTU300 combined barometric pressure, relative humidity and temperature in one transmitter. The series is discontinued and has been replaced by a suitable Indigo520 barometric-pressure configuration with an application-specific HMP probe.
The Vaisala HMM105 provides reliable humidity measurement for integration into environmental chambers, incubators and OEM equipment.
The Vaisala HMT140 Wi-Fi Data Logger has been discontinued and is no longer recommended for new monitoring systems.
The Vaisala Indigo500 Series provides flagship industrial measurement integration: choose Indigo510 for a simplified single-probe system or Indigo520 for full dual-probe capability.
The Vaisala HMP155 provides stable humidity and temperature measurement for automatic weather stations, road-weather systems, airports, research sites and demanding outdoor monitoring.
The Vaisala HMP3 is a high-accuracy, field-maintainable probe for industrial HVAC, air-handling units, cleanrooms, paint booths and environmental chambers.
