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 DPT145 provides online dew-point, pressure and temperature measurement for SF6-insulated electrical equipment. The model is being discontinued and should not be specified for new projects.
Measures dew point, pressure and temperature
Calculates SF6 density, normalised pressure and moisture in ppm
RS-485 communication with Modbus RTU
Contact Seacom for availability and replacement assessment
The Vaisala Indigo500 Series provides flagship industrial measurement integration: choose Indigo510 for a simplified single-probe system or Indigo520 for full dual-probe capability.
Indigo510: one probe and two isolated analog outputs
Indigo520: two probes, four isolated outputs and two relays
Ethernet web interface and Modbus TCP communication
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
HMP155D with RH voltage output and passive four-wire Pt100 temperature
HMP155E with RS-485 digital output
Optional warmed probe, chemical purge and additional temperature sensor
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
The Vaisala HMP7 is designed for continuously humid, rapidly changing and near-condensing environments. Probe heating helps prevent condensation while maintaining reliable process measurement.
Humidity accuracy up to ±0.8% RH
Probe heating for condensation prevention
−70 to +180 °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 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 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 GMW90 Series provides stable wall-mounted carbon-dioxide and temperature measurement, with optional humidity, for demanding HVAC and building-automation applications.
Carbon-dioxide measurement from 0 to 5000 ppm
CO₂ accuracy up to ±(30 ppm + 2% of reading)
Temperature measurement from −5 to +55 °C
Optional HUMICAP® relative-humidity measurement from 0 to 95 %RH
Voltage, current or Modbus RTU output models
Display and CO₂ status-indicator options
Field-exchangeable calibrated measurement modules
Traceable three-point CO₂ calibration certificate included
The Vaisala TMI110 provides high-accuracy temperature measurement for data-centre chilled-water systems, HVAC cooling and heating circuits, and ventilation ducts.
±0.1 °C accuracy at +20 °C
Fast response time of less than 8 seconds
4–20 mA or Modbus RTU output options
IP65 enclosure with traceable calibration certificate
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