The compact Vaisala HM40 Series provides reliable humidity and temperature spot checks for HVAC, construction, warehouses, laboratories, museums and industrial applications.
The Vaisala HUMICAP HM40 Series is a family of compact handheld humidity and temperature meters designed for quick inspections, environmental spot checks and field verification.
Four probe configurations are available for different measurement locations. The HM41 is the general-purpose model, the HM42 uses a thin probe for narrow spaces, the HM45 provides a remote probe with a handle, and the rugged HM46 uses a long stainless-steel probe for ducts, demanding locations and short-term high-temperature measurement.
All HM40 models measure relative humidity and temperature and calculate dew point, wet-bulb temperature, absolute humidity, mixing ratio and enthalpy. Numerical, statistical and graphical views help users confirm that measurements have stabilised before saving a reading.
| Model | Probe Design | Temperature Range | Recommended Use |
|---|---|---|---|
| HM41 | Compact interchangeable HMP113 probe attached directly to the indicator | -10 °C to +60 °C | General HVAC, indoor environments, warehouses, laboratories and routine spot checks |
| HM42 | Thin 4 mm stainless-steel probe with 1.5 m cable | -40 °C to +100 °C | Narrow gaps, seams, joints, beneath flooring and other restricted spaces |
| HM45 | Interchangeable HMP113 remote probe with handle and 1.2 m cable | -40 °C to +60 °C | Remote general-purpose measurements in HVAC, industry and life-science environments |
| HM46 | Long stainless-steel probe with sintered brass filter and 1.5 m cable | -40 °C to +100 °C; short-term exposure up to +180 °C | Ducts, hard-to-reach points and mechanically demanding or high-temperature locations |
| Measurement Requirement | Recommended Model |
|---|---|
| Routine room and HVAC spot checks | HM41 |
| Measurement inside narrow gaps or beneath flooring | HM42 |
| General measurement with a remote handled probe | HM45 |
| Long probe for ventilation ducts | HM46 |
| Mechanically demanding measurement point | HM46 |
| Short-term measurement above +100 °C | HM46, subject to the specified short-term exposure limit |
| Model and Condition | Accuracy |
|---|---|
| HM41 and HM45 at 0 °C to +40 °C, 0–90% RH | ±1.5% RH |
| HM41 and HM45 at 0 °C to +40 °C, 90–100% RH | ±2.5% RH |
| HM42 and HM46 at 0 °C to +40 °C, 0–90% RH | ±1.5% RH |
| HM42 and HM46 at 0 °C to +40 °C, 90–100% RH | ±2.5% RH |
| Measurement Range | 0–100% RH |
| Stability | ±2% RH over two years |
| Model and Condition | Accuracy |
|---|---|
| HM41 and HM45 at +15 °C to +25 °C | ±0.1 °C |
| HM41 and HM45 at 0 °C to +15 °C and +25 °C to +40 °C | ±0.15 °C |
| HM42 and HM46 at 0 °C to +40 °C | ±0.2 °C |
| HM42 and HM46 at -40 °C to 0 °C and +40 °C to +100 °C | ±0.4 °C |
| Specification | HM41 | HM42 | HM45 | HM46 |
|---|---|---|---|---|
| Humidity Sensor | HUMICAP 180R | HUMICAP 100R-Mini | HUMICAP 180R | HUMICAP 180R |
| Temperature Sensor | Pt1000 RTD Class F0.1 | Pt1000 RTD Class F0.3 | Pt1000 RTD Class F0.1 | Pt1000 RTD Class F0.1 |
| Typical 90% Response Time | 17 seconds | 26 seconds | 17 seconds | 40 seconds |
| Filter | Glass-reinforced plastic grid | Stainless steel and PTFE membrane | Glass-reinforced plastic grid | Sintered brass |
| Protection | IP54 | IP40 probe; IP54 indicator | IP54 | IP40 probe; IP54 indicator |
| Parameter | Practical Use |
|---|---|
| Dew Point | Evaluates condensation risk and moisture conditions |
| Wet-Bulb Temperature | Supports psychrometric and evaporative-cooling checks |
| Absolute Humidity | Shows the mass of water vapour per unit volume |
| Mixing Ratio | Represents water-vapour mass relative to dry air |
| Enthalpy | Supports HVAC energy and air-treatment assessment |
| Feature | Specification |
|---|---|
| Display | 140 × 160 pixel LCD |
| Power-Up Time | Less than 3 seconds |
| Batteries | Two AA 1.5 V batteries |
| Typical Operating Time | Approximately 100 hours without the backlight |
| Indicator Operating Temperature | -10 °C to +60 °C |
| Storage Temperature | -30 °C to +70 °C |
| Supplied Accessories | Protective case, belt clip and calibration certificate |
The HM40 provides an independent portable reference for investigating indoor conditions and checking installed HVAC sensors.
Humidity and temperature affect the drying of concrete, coatings, paint, adhesives and flooring systems. The HM40 supports environmental spot checking during construction and renovation.
The HM40 measures air humidity at the probe location. A complete structural-moisture assessment must follow the appropriate measurement method, required equilibration time and applicable construction standard.
The HM40 probe and indicator can be sent to an authorised service facility for calibration. Users can also perform an on-site one-point or two-point adjustment using an appropriate humidity reference.
| Requirement | HM40 Series | Indigo80 Platform |
|---|---|---|
| Routine humidity and temperature spot checks | Recommended | Suitable |
| Simple, compact handheld instrument | Recommended | More advanced platform |
| Two simultaneous smart probes | Not supported | Supported |
| Humidity, dew point, CO₂ or moisture-in-oil probe options | Humidity and temperature focus | Multiple Indigo-compatible probe families |
| Advanced diagnostics and transmitter configuration | Basic spot-checking and calibration functions | Recommended, able to direct calibrate Indigo Probes |
For advanced multi-parameter portable measurements, see the Vaisala Indigo80 Portable Meter.
Seacom Process Instruments supplies and supports the Vaisala HM40 portable humidity and temperature meter in Malaysia.
Our team can assist with selecting the HM41, HM42, HM45 or HM46 configuration according to the measuring location, temperature range, probe dimensions, mechanical conditions and calibration requirements.
Contact Seacom with your application, required temperature range and probe-access requirements for a suitable HM40 model.
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The new Vaisala HM70 portable humidity meter provides fast and convenient spot-checks of relative humidity and temperature. Apart from that, it can be also used to calibrate other Vaisala humidity instruments such as HMT330, HMT120, HMT130, HMW90, HMD90, HMW110, HMD110
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The new Vaisala HM70 portable humidity meter provides fast and convenient spot-checks of relative humidity and temperature. Apart from that, it can be also used to calibrate other Vaisala humidity instruments such as HMT330, HMT120, HMT130, HMW90, HMD90, HMW110, HMD110
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* The required time cycle is selected by simply pushing the changeover switch
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The compact Vaisala HM40 Series provides reliable humidity and temperature spot checks for HVAC, construction, warehouses, laboratories, museums and industrial applications.
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HM40 series Catalogue
- Portable Humidity and Temperature Meter HM40 Series
(943.57k)
