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 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 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 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 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 HMK15 is a portable, power-free humidity calibrator for checking and adjusting humidity probes and transmitters with saturated salt references.
Suitable for laboratory work and on-site humidity checks
The Sato SK-L750 Series provides portable, configurable recording for temperature or temperature and humidity, with interchangeable probes, local display, USB communication and microSD data transfer.
SK-L751: two-channel temperature data logger
SK-L754: one temperature and one relative-humidity channel
16,000 stored readings per channel
Four recording modes and 14 selectable logging intervals
USB real-time monitoring and CSV data export
AA-battery operation with optional AC-adapter power
The Vaisala HMM170 provides accurate and stable humidity and temperature measurement for demanding environmental chambers, including vacuum and pressurised applications.
Humidity accuracy up to ±1.0% RH
Temperature measurement from −70 to +180 °C
Modbus RTU and three configurable analog outputs
Probe heating, sensor warming and chemical-purge options
The Isuzu TH27R paper temperature and humidity recorder has been discontinued and is no longer recommended for new installations. Seacom continues to support existing instruments with selected chart papers and recording pens.
Legacy temperature range from −20 to +50 °C
Relative-humidity range from 0 to 100 %RH
Quartz-driven cylindrical paper-chart recorder
Replacement TH27R chart papers and cartridge pens remain available
Existing recorder and chart details must be confirmed before ordering
Closest current substitute: Sato Sigma II NSII-Q thermohygrograph
The DicksonOne TWP provides local touchscreen viewing and cloud-connected monitoring of temperature, relative humidity or differential pressure. Its replaceable sensor system simplifies calibration and supports different monitoring applications using the same logger platform.
Large 8-inch LCD touchscreen
WiFi, Ethernet and Power over Ethernet connectivity
Approximately 1,000,000 sample-point backup capacity
Up to 70 hours of rechargeable battery backup
Replaceable temperature, humidity, thermocouple, RTD and differential-pressure sensors
Phone, text and email alarms through a DicksonOne subscription
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
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