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Humidity And Temperature Transmitters For High-Accuracy Measurements In HVAC Applications HMD110 HMW110
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Vaisala HMW90 High-Accuracy Humidity and Temperature Transmitter
The Vaisala HMW90 Series provides high-accuracy humidity and temperature measurement for demanding indoor HVAC and controlled-environment applications.
- Humidity accuracy up to ±1.7% RH
- Analog or Modbus RTU output models
- Optional display and configurable relay
- Replaceable measurement module with calibration certificate
Vaisala HMW90 Humidity and Temperature Transmitter
The wall-mounted Vaisala HMW90 Series provides accurate and stable humidity and temperature measurement for indoor environments where standard HVAC transmitters may not provide sufficient performance or calibration documentation.
Typical applications include data centres, laboratories, museums, archives, production areas, warehouses and testing facilities. The series offers current, voltage and Modbus RTU models, with optional displays and configurable versions for special output scaling or calculated humidity parameters.
High-Accuracy Indoor Measurement
The HMW90 measures relative humidity across the full 0–100% RH range with accuracy up to ±1.7% RH from 0–90% RH within the specified central temperature range. Temperature accuracy reaches ±0.2 °C under normal indoor conditions.
The Vaisala HUMICAP® 180R sensor provides dependable long-term stability for demanding building-automation applications. Each humidity transmitter is supplied with a traceable calibration certificate to support commissioning, quality records and planned calibration programmes.
Flexible Outputs and Configurations
The HMW90 family includes loop-powered 4–20 mA models, voltage-output models and Modbus RTU models. Versions with a visible local display are available, while selected voltage-output models can also provide a configurable relay.
Depending on the model and configuration, output parameters can include relative humidity, temperature, dew point, mixing ratio, enthalpy, wet-bulb temperature, dew-point depression and absolute humidity.
Replaceable Measurement Module
The humidity and temperature measurement module can be replaced in the field, reducing downtime when calibration or maintenance is required. Configuration, installation and field adjustment are designed to be straightforward for building-automation technicians.
The replacement module and transmitter configuration must match the required measurements, outputs and scaling. Calibration intervals should be determined according to the application conditions, required uncertainty and quality-system requirements.
Key HMW90 Series Features
- 0–100% RH measurement range
- Humidity accuracy up to ±1.7% RH
- Temperature accuracy up to ±0.2 °C
- Current, voltage and Modbus RTU model options
- Optional local display
- Configurable relay on selected voltage-output models
- Calculated humidity-parameter options
- Field-replaceable humidity and temperature module
- Traceable calibration certificate included
- White and alternative enclosure-colour options
Individual HMW90 Series Models
Select the model according to the measured parameters, building-management-system input and whether a local display or relay is required.
| Model | Measurement | Output | Display | Recommended use |
|---|---|---|---|---|
| HMW92 | Humidity and temperature | 4–20 mA current outputs | No | Loop-powered building-automation systems |
| HMW92D | Humidity and temperature | 4–20 mA current outputs | Yes | Loop-powered systems requiring local indication |
| HMW93 | Humidity and temperature | Voltage outputs | No | Voltage-input controllers; configurable relay available |
| HMW93D | Humidity and temperature | Voltage outputs | Yes | Voltage-input controllers requiring display or relay |
| HMW95 | Humidity and temperature | Modbus RTU | No | Digital building-automation integration |
| HMW95D | Humidity and temperature | Modbus RTU | Yes | Digital integration requiring local indication |
| HMW90 | Humidity and temperature | Configurable analog or digital arrangement | Configuration dependent | Special scaling or calculated-parameter requirements |
| TMW92 | Temperature only | 4–20 mA current output | No | Loop-powered temperature measurement |
| TMW93 | Temperature only | Voltage output | No | Voltage-input temperature measurement |
| TMW90 | Temperature only | Configurable output | Configuration dependent | Special temperature scaling requirements |
Model-number guide: choose HMW92 for 4–20 mA, HMW93 for voltage output or HMW95 for Modbus RTU. Add D when a local display is required. Select an HMW90 configurable model for special scaling or calculated parameters, and a TMW model when only temperature is required.
Vaisala HMX80, HMX110, HMW90 or XMW85 Series?
These Vaisala HVAC transmitter families serve different measurement and control requirements. Choose according to accuracy, mounting location, communication method, calibration documentation and whether carbon-dioxide measurement is required.
| Selection point | Vaisala HMX80 Series | Vaisala HMX110 Series | Vaisala HMW90 Series | Vaisala XMW85 Series |
|---|---|---|---|---|
| Product position | Cost-effective routine HVAC | Balanced high-accuracy HVAC | Premium indoor wall measurement | Smart indoor Modbus and air-quality measurement |
| Measured parameters | Humidity and temperature; temperature-only models available | Humidity and temperature; temperature-only models available | Humidity and temperature; temperature-only models available | Humidity and temperature, with optional CO₂ measurement |
| Humidity accuracy | Up to ±3% RH | Up to ±2% RH | Up to ±1.7% RH | Up to ±3% RH |
| Installation options | Indoor wall, duct, humid-area wall and outdoor | Indoor wall, duct and outdoor | Indoor wall only | Indoor wall only |
| Output and communication | Current, voltage or Modbus RTU, depending on model | 4–20 mA or Modbus RTU, depending on model | Current, voltage or Modbus RTU, depending on model | Modbus RTU on all models |
| Local display | Available on selected models | No display on standard models | Available on selected models | Available on selected models |
| Calibration certificate | Not supplied | Traceable certificate included | Traceable certificate included | Confirm according to selected model and project requirement |
| Main reason to choose | Simple, economical measurement across multiple mounting styles | Better accuracy and documentation for demanding HVAC locations | Highest humidity accuracy for an indoor wall transmitter | Modbus integration or combined CO₂, humidity and temperature measurement |
Quick selection: choose the 80 Series for routine HVAC where cost and mounting flexibility are the priorities. Choose the 110 Series when better accuracy and a traceable certificate are required for wall, duct or outdoor measurement. Choose HMW90 for premium indoor wall measurement. Choose XMW85 for indoor Modbus systems, especially when CO₂ must be measured with humidity and temperature.
Common HMW90 Applications
- Data centres and critical equipment rooms
- Laboratories and testing environments
- Museums, archives and collections storage
- Pharmaceutical and medical-device facilities
- Production areas and controlled warehouses
- Demanding indoor HVAC and building automation
Information Required for HMW90 Selection
Before ordering, confirm the required measurement parameters, 4–20 mA, voltage or Modbus RTU interface, display requirement, relay function, output scaling, operating range, enclosure colour and calibration requirements.
For existing installations, provide the current model number, wiring, controller input and output scaling. This helps ensure that the replacement model matches both the electrical arrangement and building-management-system configuration.
Humidity Monitoring for Data Centres
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
Vaisala HMW90 Supplier and Technical Support in Malaysia
Seacom Process Instruments supplies and supports the Vaisala HMW90 Humidity and Temperature Transmitter in Malaysia for data centres, laboratories, museums, archives, controlled warehouses and demanding HVAC applications.
Our team can assist with model selection, output type, display, relay, calculated parameter, special scaling, installation location, controller integration and calibration planning.
Contact Seacom with your required humidity and temperature accuracy, building-management-system interface, display requirement and application conditions so we can recommend a suitable HMW90 configuration.
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The Vaisala HMW90 Series provides high-accuracy humidity and temperature measurement for demanding indoor HVAC and controlled-environment applications.
- Humidity accuracy up to ±1.7% RH
- Analog or Modbus RTU output models
- Optional display and configurable relay
- Replaceable measurement module with calibration certificate
16 other products in the same category:
The Vaisala HMP110 is a high-accuracy humidity and temperature probe designed for demanding equipment integration, environmental chambers, data loggers, incubators and controlled-environment applications.
It provides ±1.5% RH accuracy, a 0–100% RH range, −40 °C to +80 °C temperature measurement, a chemically resistant HUMICAP 180R sensor and analog or Modbus RTU output options.
The Vaisala HMP155 provides stable humidity and temperature measurement for automatic weather stations, road-weather systems, airports, research sites and demanding outdoor monitoring.
- Relative-humidity measurement from 0 to 100 %RH
- Operating range from −80 to +60 °C
- HMP155A with two analogue voltage outputs
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The Vaisala HMT370EX provides intrinsically safe humidity and temperature measurement with HMP-series probes. The new DMP370 configuration combines the HMT370EX transmitter with a DMP37X DRYCAP® probe for low-dew-point measurement in hazardous locations.
- HMP probes for relative humidity and temperature
- DMP370 dew-point measurement from −70 to +10 °C Td/f
- Two two-wire 4–20 mA outputs
- Certified configurations for hazardous gas and dust areas, up to Zone 0 / 20
- Detachable probes and traceable calibration
DMP370 availability: Vaisala plans first deliveries for Q1 2027. Contact Seacom for configuration and project lead time.
The Vaisala HMM100 provides reliable humidity measurement and a configurable analog output for integration into environmental chambers and OEM equipment.
- 0–100% RH measurement range
- Relative-humidity or dew-point output
- Current and voltage output options
- Plastic or stainless-steel probes for temperatures up to +180 °C
The Vaisala HMP4 provides high-accuracy humidity and temperature measurement in compressed air, breathing air, industrial gases, vacuum systems and other processes operating at pressures up to 100 bar.
- Operating pressure below 100 bar, including vacuum applications
- Humidity accuracy up to ±0.8% RH
- Temperature range from -70 °C to +180 °C
- Standalone Modbus RTU or connection to an Indigo transmitter
The Vaisala XMW85 Series provides reliable indoor CO2, humidity and temperature measurement for demand-controlled ventilation, smart buildings and indoor air-quality monitoring.
All models support Modbus RTU over RS-485, with two-in-one and three-in-one measurement configurations and optional metric or non-metric displays.
The Vaisala MGP261 measures methane, carbon dioxide and humidity directly in raw biogas. Its in-situ design avoids a separate sampling system and helps operators monitor gas quality while protecting downstream equipment.
- Measures CH4, CO2 and water vapour in one probe
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- Ex-certified construction for direct installation in hazardous process areas
The Vaisala HMD60 Series provides high-accuracy humidity and temperature measurement for demanding HVAC ducts and light-industrial applications.
- Humidity accuracy up to ±1.5% RH
- Temperature accuracy up to ±0.1 °C
- Analog, Modbus RTU and BACnet MS/TP options
- Robust IP66 metal enclosure
The Vaisala Origo10 Series comprises modular HVAC transmitters with interchangeable probes for humidity, temperature, CO2 and dew-point measurement.
Available with analog, Modbus RTU and BACnet MS/TP outputs, wall or duct mounting, an optional display and an IP65-rated enclosure.
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- HMT334 high pressure and vacuum → HMP4 with Indigo500
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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.
- Humidity accuracy up to ±1.5% RH
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- HMT130 voltage outputs, RS-485 and relay
- Interchangeable fixed or remote measurement probe
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The Vaisala HMP5 provides high-accuracy humidity and temperature measurement in ovens, dryers, kilns and other processes operating at temperatures up to +180 °C.
- Humidity accuracy up to ±0.8% RH
- Temperature accuracy up to ±0.1 °C
- −70 to +180 °C probe-head measurement range
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The Vaisala HMP60 is a compact, durable and cost-effective humidity and temperature probe for equipment integration, data loggers, incubators, glove boxes, greenhouses and environmental monitoring systems.
It provides 0–100% RH and −40 °C to +60 °C measurement ranges, low power consumption, interchangeable Vaisala INTERCAP sensor and optional Modbus RTU communication.
The Vaisala Indigo520 Supervisor manages up to 100 compatible compact humidity and temperature probes through one host unit. It provides local visibility for the maintenance team and Modbus TCP communication for data centre BMS integration.
- Two daisy chains: Up to 50 probes per chain.
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- Web interface: Supports commissioning and configuration.
- Malaysia project support: Contact Seacom for probe selection and installation requirements.
Expected availability: early 2027. Enquire with Seacom for configuration and delivery confirmation.
The Vaisala Indigo300 is a rugged industrial transmitter for one Vaisala Indigo-compatible smart probe, providing local measurement display and up to three configurable analog outputs.
Its corrosion-resistant IP66 metal enclosure, flexible probe mounting and interchangeable probe design make Indigo300 suitable for humidity, temperature, dew point, CO2, moisture in oil and other demanding industrial measurements.
The Vaisala XMP10 Series comprises compact humidity and temperature probes offering accuracy levels up to ±1% RH and ±0.1 °C for demanding HVAC, data-centre and critical-environment applications.
The probes feature analog or Modbus RTU outputs, a standard M8 connector, an IP65-rated body and compatibility with Vaisala Origo10 modular HVAC transmitters.