Humidity

The Vaisala HMDW80 Series provides cost-effective humidity and temperature measurement for routine HVAC and building-automation applications.

• Humidity accuracy up to ±3% RH
• Wall, duct and outdoor installation models
• Current or voltage output configurations
• Replaceable INTERCAP® humidity sensor

The Vaisala HMX110 Series provides accurate humidity and temperature measurement for demanding indoor, duct and outdoor HVAC applications.

• Humidity accuracy up to ±2% RH
• Wall, duct, outdoor and immersion models
• 4–20 mA or Modbus RTU configurations
• Traceable calibration certificate included

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.

• HMT331 wall mounting → HMP1 with Indigo500
• HMT333 ducts and tight spaces → HMP3 or HMP9 with Indigo500
• HMT334 high pressure and vacuum → HMP4 with Indigo500
• HMT335 high temperature → HMP5 with Indigo500
• HMT337 high humidity → HMP7 with Indigo500
• HMT338 pressurised pipelines → HMP8 with Indigo500

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.

• HMT361 wall mounting → HMP371
• HMT363 ducts and confined spaces → HMP373
• HMT364 high pressure and vacuum → HMP374
• HMT365 high temperature → HMP375
• HMT367 high humidity → HMP377
• HMT368 pressurised pipelines → HMP378

The Vaisala HPP270 Series provides stable, repeatable measurement for demanding vaporized hydrogen peroxide bio-decontamination processes.

• HPP271 measures vaporized H₂O₂ concentration
• HPP272 adds relative saturation, relative humidity and temperature
• H₂O₂ measurement range from 0 to 2000 ppm
• Accuracy of ±10 ppm or 5% of reading, whichever is greater
• Two 4–20 mA outputs or RS-485 with Modbus RTU
• IP65 stainless-steel construction with Vaisala PEROXCAP® technology
• Compatible with Vaisala Indigo transmitters and Indigo80

The Vaisala Indigo200 Series is the standard transmitter platform for one interchangeable Indigo-compatible smart probe, providing local display and practical automation-system connectivity.

• Indigo201 with three analog outputs and two relays
• Indigo202 with Modbus RTU and two relays
• Colour display with numerical and graphical views
• IP65 enclosure for industrial measurement applications

The Vaisala HMP9 combines a miniature 5 mm probe head with fast-response, high-accuracy humidity and temperature measurement for tight spaces and rapidly changing environments.

• Humidity accuracy up to ±0.8% RH
• Temperature accuracy up to ±0.1 °C
• −40 to +120 °C probe-head measurement range
• Standalone Modbus RTU or Vaisala Indigo transmitter operation

The Vaisala HMP8 provides high-accuracy humidity and temperature measurement in compressed air, refrigerant dryers and pressurised industrial processes up to 40 bar.

• Humidity accuracy up to ±0.8% RH
• Operating pressure from vacuum to 40 bar
• Adjustable insertion depth with two probe lengths
• Optional ball valve for insertion and removal under process conditions

The Vaisala HMP3 is a high-accuracy, field-maintainable probe for industrial HVAC, air-handling units, cleanrooms, paint booths and environmental chambers.

• Humidity accuracy up to ±0.8% RH
• Temperature measurement from −40 to +120 °C
• Field-replaceable filter and HUMICAP sensor option
• Standalone Modbus RTU or Vaisala Indigo transmitter operation