Vaisala HMT140 Wi-Fi Data Logger – Discontinued, Replaced by RFL100

The Vaisala HMT140 Wi-Fi Data Logger has been discontinued and is no longer recommended for new monitoring systems.

  • Primary replacement: Vaisala RFL100 with AP10 VaiNet Access Point
  • Existing HMT140 installations can continue to be supported
  • Migration should be checked against the existing sensor and input type
  • Contact Seacom for replacement selection and viewLinc compatibility

Vaisala HMT140 Wi-Fi Data Logger — Discontinued

Product status: The Vaisala HMT140 has been discontinued. For new wireless temperature and humidity monitoring systems, use the Vaisala RFL100 Wireless Data Logger with AP10 Access Point. Existing HMT140 users should confirm the installed input type before selecting a replacement.

The HMT140 was a battery-powered Wi-Fi data logger for use with the Vaisala viewLinc Continuous Monitoring System. Depending on the model, it could measure relative humidity, temperature, RTD inputs, voltage, current or Boolean contacts.

This page remains available to help existing users identify installed HMT140 models, maintain operating systems and plan migration to current Vaisala monitoring hardware.

Recommended Replacement

Existing HMT140 ApplicationRecommended Direction
Temperature and relative humidity RFL100 with AP10
Refrigerator, freezer or cold-room temperature RFL100 with a suitable temperature probe
CO₂, temperature and humidity RFL100 with compatible probes and AP10
Voltage, current or Boolean input Application review required; a VDL200 or another viewLinc-compatible interface may be more suitable

The RFL100 uses Vaisala VaiNet rather than the HMT140’s direct Wi-Fi connection. Each installation therefore requires an AP10 Access Point and a check of wireless coverage, probe compatibility and viewLinc version.

HMT140 Model Identification

Legacy ModelMeasurement Channels
HMT141 1 temperature and 1 relative-humidity channel using an HMP110 probe
HMT143 2 RTD temperature channels
HMT144 2 voltage inputs, 0–5 V DC
HMT145 2 voltage inputs, 0–10 V DC
HMT146 2 current inputs, 0–20 mA
HMT147 2 Boolean or door-contact inputs
HMT148 1 RTD temperature input and 1 Boolean input
HMT14D 1 RTD temperature input and 1 current input
HMT14E 1 RTD temperature input and 1 voltage input, 0–5 V DC
HMT14F 1 RTD temperature input and 1 voltage input, 0–10 V DC

Legacy HMT140 Measurement Performance

MeasurementLegacy Specification
Relative humidity 0–100% RH using the HMP110 probe
HMP110 temperature −40 to +80 °C
RTD temperature input −196 to +90 °C
Current input 0–22 mA measurement range
Voltage input 0–5 V or 0–10 V, depending on model
Contact input Open/closed dry contact

Legacy Technical Specifications

Wireless network IEEE 802.11b/g Wi-Fi
Wi-Fi security WEP 128-bit, WPA or WPA2 Personal
Memory 3,060 samples
Sample interval User selectable from 2 to 60 minutes
Display Optional 128 × 64 monochrome display without backlight
Housing protection IP65
Operating temperature without display −40 to +60 °C
Operating temperature with display −20 to +60 °C
Weight 300 g with batteries, without probe

HMT140 and RFL100 Comparison

FeatureLegacy HMT140Current RFL100 System
Wireless technology Direct 2.4 GHz Wi-Fi VaiNet wireless through AP10
Primary measurements Model-dependent temperature, RH, analog or contact inputs Temperature, RH and CO₂ using compatible probes
Network connection Each logger connects to the Wi-Fi network AP10 connects the VaiNet devices to the network
Local measurement memory 3,060 samples 30 days of local measurement storage
Product status Discontinued Current wireless viewLinc platform

Migration Checklist for Existing HMT140 Users

  • Record the complete HMT140 model number and installed channel type.
  • Confirm the measurement range, required accuracy and existing probe arrangement.
  • Check whether temperature, humidity, analog or door-contact inputs are being used.
  • Confirm the installed viewLinc version and server environment.
  • Review the location of existing Wi-Fi access points and the proposed AP10 installation.
  • Carry out a VaiNet coverage assessment where walls, cold-room panels or production equipment may affect the signal.
  • Plan calibration, qualification and change-control documentation before replacing devices in a regulated system.

Vaisala HMT140 Replacement and viewLinc Support in Malaysia

Seacom Process Instruments supports existing Vaisala HMT140 installations in Malaysia and supplies current Vaisala RFL100, AP10 and VDL200 monitoring hardware for pharmaceutical facilities, laboratories, hospitals, blood banks, warehouses, cold rooms and other controlled environments.

Our team can assist with installed-model identification, replacement selection, monitoring-point planning, VaiNet coverage assessment, network architecture, viewLinc integration, installation, commissioning, calibration planning and GxP validation documentation.

Contact Seacom with the HMT140 model number, measured parameters, probe details, device quantities, facility layout, network constraints and validation requirements for a suitable migration plan.

Download

  HMT140 Catalogue   (170.92k)

  HMT140 Order Form   (178.69k)


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