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HMT140 catalogue
Wi-Fi Data Logger (CMS, FDA Approved) HMT140
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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 Application | Recommended 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 Model | Measurement 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
| Measurement | Legacy 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
| Feature | Legacy HMT140 | Current 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.
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- 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
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