Vaisala HMT120 and HMT130 Transmitters – Are Being Replaced by Origo10

Vaisala HMT120 and HMT130 Humidity and Temperature Transmitters

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
  • HMT120 loop-powered 4–20 mA output
  • HMT130 voltage outputs, RS-485 and relay
  • Interchangeable fixed or remote measurement probe
  • Origo10 recommended for new installations

Vaisala HMT120 and HMT130 Humidity and Temperature Transmitters

The Vaisala HUMICAP HMT120 and HMT130 are high-accuracy humidity and temperature transmitters designed for cleanrooms, laboratories, data centres, museums and demanding HVAC or light-industrial applications.

Both models use an interchangeable measurement probe, allowing the probe to be removed and replaced without readjusting the transmitter. This minimises system downtime and makes it easier to maintain measurement traceability.

The main difference is the electrical interface. The HMT120 is a two-wire, loop-powered transmitter with 4–20 mA outputs. The HMT130 is a three-wire transmitter offering configurable voltage outputs, non-isolated RS-485 communication and a relay.

HMT120/HMT130 Product Transition

The HMT120 and HMT130 are approaching the end of their product lifecycle and are expected to be phased out within approximately one to two years. They remain relevant for existing installations, specified replacements and projects that require compatibility with an installed HMT120/HMT130 system.

For new cleanroom, laboratory, data-centre and demanding HVAC projects, the Vaisala Origo10 is the recommended successor. Origo10 retains the modular transmitter-and-probe approach while providing a newer platform for building-management and automation integration.

Project SituationRecommended Approach
New project or new system specification Select Vaisala Origo10 as the preferred replacement platform
Existing HMT120/HMT130 installation Review like-for-like replacement availability and the future migration plan
Immediate replacement of a failed transmitter Confirm HMT120/HMT130 availability, probe compatibility and output requirements with Seacom
System expansion Compare extending the existing platform with beginning a controlled transition to Origo10

Why Choose the Vaisala HMT120 or HMT130?

  • High Measurement Accuracy: Provides relative-humidity accuracy up to ±1.5% RH and temperature accuracy up to ±0.1 °C.
  • Excellent Long-Term Stability: Vaisala HUMICAP technology supports dependable control and monitoring in demanding environments.
  • Cleanroom-Compatible Housing: The smooth enclosure surface is easy to clean, tolerates cleaning agents and supports rear-wall cable entry.
  • Interchangeable Probe: Replace the measurement probe without adjusting the transmitter body.
  • Fixed or Remote Probe: Select direct wall measurement or position the probe remotely in a duct, chamber or restricted location.
  • Current or Voltage Outputs: Choose loop-powered 4–20 mA or three-wire voltage-output configurations.
  • Optional Display: A two-line LCD can show two selected parameters simultaneously.
  • Calculated Parameters: Selected configurations provide dew point, wet-bulb temperature, enthalpy, absolute humidity, mixing ratio and vapour-pressure values.
  • Traceable Calibration: Each transmitter is individually adjusted and supplied with a traceable calibration certificate.

HMT120 and HMT130 Comparison

FeatureHMT120HMT130
Wiring Two-wire, loop powered Three-wire
Primary Output 4–20 mA current output 0–1 V, 0–5 V, 0–10 V or user-defined voltage output between 0–10 V
Serial Interface Service interface for configuration and calibration Non-isolated RS-485
Relay Not available One relay, maximum 50 V DC and 200 mA
Supply 10–30 V DC at zero loop resistance 10–35 V DC or 24 V AC ±20%; 15–35 V DC when using 0–10 V output
Recommended Use Conventional 4–20 mA monitoring, PLC and building-automation inputs Voltage-output systems, serial communication and local relay applications

Measurement Probe Options

ProbeConstructionOperating RangeRecommended Application
HMP110 Stainless-steel humidity and temperature probe with Vaisala HUMICAP sensor -40 °C to +80 °C Demanding cleanroom, industrial, outdoor and remote-probe applications
HMP113 Lightweight PC/ABS humidity and temperature probe with Vaisala HUMICAP sensor -40 °C to +60 °C General indoor and fast-response HVAC applications
HMP110REF Constant-output reference probe Provides fixed humidity and temperature values Checking the monitoring system, transmitter input and signal-transfer path

Relative Humidity Measurement Performance

SpecificationPerformance
Measurement Range 0–100% RH
Accuracy at 0 °C to +40 °C, 0–90% RH ±1.5% RH
Accuracy at 0 °C to +40 °C, 90–100% RH ±2.5% RH
Accuracy Outside the Central Temperature Range, 0–90% RH ±3% RH within the applicable probe operating range
Accuracy Outside the Central Temperature Range, 90–100% RH ±4% RH within the applicable probe operating range
Factory Calibration Uncertainty at +20 °C, 0–90% RH ±1.1% RH
Factory Calibration Uncertainty at +20 °C, 90–100% RH ±1.8% RH
Typical HVAC Stability ±0.5% RH per year
Standard Humidity Sensor Vaisala HUMICAP 180R

Temperature Measurement Performance

SpecificationHMP110HMP113
Measurement Range -40 °C to +80 °C -40 °C to +60 °C
Accuracy at +15 °C to +25 °C ±0.1 °C ±0.1 °C
Accuracy at 0 °C to +15 °C and +25 °C to +40 °C ±0.15 °C ±0.15 °C
Accuracy Outside 0 °C to +40 °C ±0.4 °C within the probe range ±0.4 °C within the probe range

Calculated Humidity Parameters

Depending on the ordered configuration, HMT120 and HMT130 can output or display several humidity-related parameters.

ParameterApplication
Relative Humidity Environmental control and routine cleanroom monitoring
Dew Point or Frost Point Condensation-risk and low-temperature moisture assessment
Wet-Bulb Temperature Psychrometric and evaporative-cooling calculations
Enthalpy HVAC energy and air-treatment analysis
Absolute Humidity Water-vapour mass per unit volume
Mixing Ratio Water-vapour mass relative to dry air
Vapour Pressure Water-vapour partial-pressure assessment
Saturation Vapour Pressure Humidity calculations at the measured temperature

HMT120 Electrical Specifications

FeatureSpecification
Transmitter Type Two-wire, loop powered
Current Output 4–20 mA
External Loop Voltage at 0 Ω 10–30 V DC
External Loop Voltage Below 500 Ω 20–30 V DC

HMT130 Electrical Specifications

FeatureSpecification
Transmitter Type Three-wire
Voltage Outputs 0–1 V, 0–5 V, 0–10 V or user-defined between 0–10 V
Minimum Output Resistance 1 kΩ
Serial Interface RS-485, non-isolated
Relay One relay, maximum 50 V DC and 200 mA
Supply Voltage 10–35 V DC; 15–35 V DC for 0–10 V output; or 24 V AC ±20%
Current Consumption at 24 V DC 8 mA; 15 mA with relay closed

Cleanroom Monitoring

The HMT120 and HMT130 enclosure is designed for cleanroom use. Its smooth external surface is easy to wipe, the enclosure material tolerates common cleaning agents, and wiring can enter through the rear wall to minimise exposed cabling.

  • Room Humidity and Temperature: Provides stable environmental input for cleanroom monitoring and HVAC control.
  • Remote Probe Installation: Places the sensing point inside the controlled area while locating the transmitter at a more accessible position.
  • Interchangeable Probe: Allows rapid probe exchange with minimal disruption to the monitored room.
  • Optional Display: Gives local personnel immediate visibility of two selected measurement parameters.
  • Constant-Output Probe: Supports functional verification of the transmitter, monitoring system and signal-transfer line.

Data Centre and Demanding HVAC Applications

HMT120 and HMT130 are also suitable for data centres and other facilities requiring dependable room, duct or remote humidity and temperature measurements.

  • Data halls and equipment rooms
  • Supply-air and return-air measurement
  • Laboratories and testing areas
  • Museums, archives and controlled storage
  • Production facilities and industrial HVAC systems
  • Remote probe measurement in restricted or higher-temperature locations

For data-centre planning guidance, see our Vaisala Data Centre Environmental Monitoring Guide.

Outdoor and Duct Installation

Remote-probe models can be adapted for outdoor or duct measurement using the correct Vaisala accessories.

  • Outdoor Measurement: Use the compatible installation kit and Vaisala DTR504A radiation shield.
  • Rain Protection: A rain shield and installation kit are available for appropriate transmitter installations.
  • Duct Installation: Use the compatible duct-installation kit to position the probe at a representative depth.
  • Remote Probe Cables: Standard cable options include 3 m, 5 m, 10 m and 20 m, with longer total distances possible according to the supported configuration.

Calibration and System Verification

  • Probe Exchange: Replace the calibrated probe without adjusting the transmitter.
  • Handheld Reference: Check or adjust the transmitter using a compatible Vaisala HM70 meter and connection cable.
  • Computer Connection: Use the service interface and compatible Vaisala software for configuration and maintenance.
  • One-Point Adjustment: Apply an on-site correction using a suitable reference.
  • Two-Point Adjustment: Calibrate against two humidity references for improved confidence across the measurement range.
  • Constant-Output Probe: Install HMP110REF to test how the complete system handles fixed RH and temperature signals.

Operating and Mechanical Specifications

SpecificationValue
Transmitter Protection IP65
Transmitter Operating Temperature without Display -40 °C to +60 °C
Transmitter Operating Temperature with Display -20 °C to +60 °C
Storage Temperature -50 °C to +70 °C
Weight Approximately 270 g
Optional Display 128 × 64 pixel monochrome graphical display without backlight
Transmitter Housing PBT plastic
Terminal Wire Size 0.5–1.5 mm² or AWG 20–15
Probe Interface Four-pin female M8 panel connector

Related Vaisala Products

Selecting the Correct Configuration

RequirementRecommended Configuration
Loop-powered 4–20 mA output HMT120
Voltage output or relay HMT130
Local measurement display HMT120 or HMT130 with optional display
Rugged stainless-steel probe HMP110 probe
Lightweight fast-response indoor probe HMP113 probe
Restricted or higher-temperature measuring point Remote HMP110 probe with suitable cable and mounting accessory
System signal-path verification HMP110REF constant-output probe
New platform evaluation Ask Seacom to compare HMT120/HMT130 with the newer Vaisala Origo10 platform

Vaisala HMT120 and HMT130 Supplier in Malaysia

Seacom Process Instruments supplies and supports the Vaisala HMT120 and HMT130 humidity and temperature transmitters in Malaysia.

Our team can assist with existing-system replacement requirements, model selection, probe type, output signal, display option, remote-probe cable, installation accessories, calibration planning and migration to the Vaisala Origo10 platform.

Contact Seacom with your required measurement range, output type, probe location, cable distance and environmental conditions for a suitable configuration.

Download

  HMT120 HMT130 Catalogue - Humidity and Temperature Transmitter for Clean Room HMT120 / HMT130 (213.27k)
  HMT120 Order Form - (125.17k)
  HMT130 Order Form - (126.32k)

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