The Vaisala HMM170 provides accurate and stable humidity and temperature measurement for demanding environmental chambers, including vacuum and pressurised applications.
The Vaisala HUMICAP® HMM170 is a robust open-frame measurement module for integration into environmental chambers and OEM equipment. It is designed for applications requiring dependable humidity and temperature measurement across a wide operating range, including vacuum, elevated pressure, high humidity and chemically demanding conditions.
The module combines an external stainless-steel probe with an open-frame circuit board. This allows the probe to be positioned at the representative measurement point while the electronics are installed in a protected and serviceable location inside the equipment.
The HMM170 measures relative humidity from 0–100% RH and temperature from −70 to +180 °C. At normal room temperature, relative-humidity accuracy reaches ±1.0% RH from 0–90% RH.
In addition to relative humidity and temperature, the module calculates dew point, wet-bulb temperature, enthalpy, mixing ratio, water-vapour pressure and other humidity parameters. Measurement values can be transferred to the chamber controller through Modbus RTU or up to three configurable analog outputs.
Environmental chambers may expose humidity sensors to prolonged high humidity, condensation, cleaning agents and chemical vapours. The HMM170 provides optional functions that help maintain measurement availability and long-term stability under these conditions.
The required heating function and humidity sensor should be selected according to the chamber atmosphere. Available sensor options support general humidity measurement, vaporised hydrogen peroxide environments and moisture-in-oil applications.
The HMM170 provides an RS-485 interface with Modbus RTU and three freely configurable analog output channels. It can supply several measurement parameters to the chamber controller without requiring a separate external transmitter.
An integrated service port allows connection to Vaisala Insight PC software for configuration, diagnostics, temporary live monitoring, calibration and adjustment. Probe cable options of 2, 5 and 10 metres support different chamber layouts and electronics-compartment locations.
The HMM170 circuit-board footprint also supports practical upgrades from many existing HMM100 installations. Electrical connections, outputs, mechanical dimensions and controller programming should still be checked before replacement.
All three modules are designed for integration into environmental chambers or OEM equipment. The correct model depends mainly on the controller interface, required outputs, chamber conditions and maintenance functions.
| Selection point | Vaisala HMM100 | Vaisala HMM105 | Vaisala HMM170 |
|---|---|---|---|
| Best suited for | Conventional chambers requiring one analog measurement output | OEM chambers and incubators with direct I2C controller integration | Demanding chambers requiring higher accuracy, multiple outputs or condensation protection |
| Measured parameters | Relative humidity or dew point | Relative humidity or dew point | Relative humidity, temperature, dew point and other calculated parameters |
| Humidity range | 0–100% RH | 0–100% RH | 0–100% RH |
| RH accuracy at −20 to +40 °C | ±2% RH from 0–90% RH | ±2% RH from 0–90% RH | Approximately ±1.0 to ±1.7% RH, depending on temperature and RH |
| Primary output | One configurable current or voltage output | Digital I2C | Modbus RTU and three configurable analog outputs |
| Probe temperature capability | Up to +180 °C, depending on probe and filter | Up to +180 °C continuously; +200 °C short-term peak | −70 to +180 °C |
| Probe arrangement | Plastic or stainless-steel probe with several cable and length options | Detachable 12 mm probe with fixed 300 mm flexible cable | 12 mm stainless-steel probe with 2, 5 or 10 m cable options |
| Condensation and chemical protection | Standard HUMICAP measurement without active probe heating | Standard HUMICAP measurement without active probe heating | Optional sensor purge, probe heating and sensor warming |
| Configuration and servicing | Service port and on-board adjustment trimmers | Configuration and adjustment through the I2C interface | Vaisala Insight software through the integrated service port |
Quick selection: choose HMM100 when the chamber controller needs a conventional analog signal. Choose HMM105 when direct I2C communication and a compact detachable probe are required. Choose HMM170 for demanding installations needing improved accuracy, Modbus RTU, several analog outputs, longer probe cables or active condensation protection.
Before selecting the HMM170, confirm the chamber temperature and humidity range, operating pressure, expected condensation, chemical exposure, probe-cable length, required measurement parameters, controller inputs and preferred communication interface.
For retrofit projects, provide the existing module model, output configuration, wiring details, probe installation and controller scaling. This allows the mechanical and electrical requirements to be checked before replacing an HMM100 or another chamber sensor.
Seacom Process Instruments supplies and supports the Vaisala HMM170 Humidity and Temperature Module in Malaysia for environmental chambers, stability chambers, climatic test equipment, incubators and demanding OEM measurement systems.
Our team can assist with humidity-sensor selection, probe heating, sensor purge, cable length, output configuration, Modbus integration, installation planning, commissioning and calibration support.
Contact Seacom with your chamber operating range, pressure, chemical exposure, condensation conditions, controller interface and required outputs so we can recommend a suitable HMM170 configuration.
The Vaisala HMM100 provides reliable humidity measurement and a configurable analog output for integration into environmental chambers and OEM equipment.
The Vaisala HMM105 provides reliable humidity measurement for integration into environmental chambers, incubators and OEM equipment.
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.
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 Indigo200 Series is the standard transmitter platform for one interchangeable Indigo-compatible smart probe, providing local display and practical automation-system connectivity.
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.
Expected availability: early 2027. Enquire with Seacom for configuration and delivery confirmation.
The Vaisala HMX110 Series provides accurate humidity and temperature measurement for demanding indoor, duct and outdoor HVAC applications.
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 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 HMP5 provides high-accuracy humidity and temperature measurement in ovens, dryers, kilns and other processes operating at temperatures up to +180 °C.
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.
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.
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 HMP8 provides high-accuracy humidity and temperature measurement in compressed air, refrigerant dryers and pressurised industrial processes up to 40 bar.
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 HMD60 Series provides high-accuracy humidity and temperature measurement for demanding HVAC ducts and light-industrial applications.
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.
