- Out-of-Stock
HM40 catalogue
Portable Humidity and Temperature Meter HM40 Series
1.8MB
Vaisala HM40 Portable Humidity and Temperature Meter
The compact Vaisala HM40 Series provides reliable humidity and temperature spot checks for HVAC, construction, warehouses, laboratories, museums and industrial applications.
- Humidity accuracy up to ±1.5% RH
- HM41, HM42, HM45 and HM46 probe configurations
- Numeric, statistical and graphical trend displays
- Traceable calibration certificate included
Vaisala HM40 Portable Humidity and Temperature Meter
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.
Why Choose the Vaisala HM40?
- Reliable Spot Checks: Provides accurate portable humidity and temperature measurements for HVAC, industrial, construction and life-science applications.
- Four Probe Configurations: Select a model suited to general rooms, narrow gaps, remote locations, ducts or demanding high-temperature points.
- Full Humidity Range: Measures relative humidity from 0–100% RH.
- Calculated Parameters: Displays dew point, wet-bulb temperature, absolute humidity, mixing ratio and enthalpy.
- Clear Graphical Display: Numerical, statistics and graph views support rapid interpretation of measurement conditions.
- Measurement-Stability Indication: The graph helps the operator confirm when the reading has stabilised.
- Hold and Save Function: Freezes the display and saves selected spot-check values for review.
- Ten Interface Languages: Includes English, simplified Chinese, Finnish, French, German, Japanese, Portuguese, Russian, Spanish and Swedish.
- Calibration Reminder: A user-configurable reminder supports planned recalibration.
- Calibration Certificate: Each instrument is supplied with a traceable calibration certificate.
HM41, HM42, HM45 and HM46 Comparison
| 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 |
Selecting the Correct HM40 Model
| 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 |
Relative Humidity Measurement Performance
| 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 |
Temperature Measurement Performance
| 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 |
Probe Specifications
| 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 |
Calculated Humidity Parameters
| 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 |
Display and User Functions
- Numeric View: Shows the selected measurement values clearly for routine spot checks.
- Statistics View: Displays current, minimum, maximum and average values.
- Graph View: Shows recent measurement trends and helps confirm stabilisation.
- Hold and Tag: Freezes the displayed reading and saves a tagged measurement point.
- Pressure Setting: Allows the ambient pressure to be entered for pressure-dependent calculated parameters.
- Calibration Reminder: Reminds the user when the selected calibration interval has elapsed.
- Automatic Power-Off: Conserves battery power when the instrument is not being used.
Indicator and Power Specifications
| 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 |
HM40 for HVAC Inspection and Commissioning
The HM40 provides an independent portable reference for investigating indoor conditions and checking installed HVAC sensors.
- Verify room temperature and humidity during commissioning
- Compare wall or duct transmitter readings with a portable reference
- Investigate hot, cold, dry or humid complaints
- Check supply-air and return-air conditions
- Confirm measurement stability before recording the result
- Support preventive-maintenance inspections
Construction and Structural-Moisture Applications
Humidity and temperature affect the drying of concrete, coatings, paint, adhesives and flooring systems. The HM40 supports environmental spot checking during construction and renovation.
- HM41: General room-condition checks during drying and finishing work.
- HM42: Measurement in narrow gaps, joints and beneath flooring.
- HM45: Remote measurement where the indicator cannot be positioned beside the sensing point.
- HM46: Rugged insertion measurements in demanding or difficult-to-reach locations.
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.
Industrial, Laboratory and Storage Applications
- Industrial Production: Spot checks around production processes, drying areas and controlled workspaces.
- Laboratories: Verification of temperature and humidity in research, test and calibration areas.
- Life-Science Facilities: Routine environmental inspections in controlled rooms and storage areas.
- Warehouses: Checks for conditions that may contribute to corrosion, mould, packaging damage or material degradation.
- Museums and Archives: Environmental checks around sensitive artworks, documents and stored collections.
- Ventilation Ducts: HM46 insertion measurements in supply-air and return-air systems.
Calibration and Maintenance
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.
- Reference Comparison: Compare the HM40 against another suitable calibrated reference instrument.
- Salt-Chamber Calibration: Use the Vaisala HMK15 Humidity Calibrator to generate known humidity reference environments.
- One- or Two-Point Adjustment: Apply an adjustment through the HM40 calibration menu.
- Replaceable Filters: Select the appropriate replacement filter for the probe and application.
- Interchangeable HMP113: HM41 and HM45 use a replaceable HMP113 measurement probe.
HM40 or Indigo80?
| 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.
Vaisala HM40 Supplier in Malaysia
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.
You might also like
The Vaisala HM70 was a handheld meter for humidity and temperature spot checks, field measurements, data logging and verification of installed Vaisala instruments. It is discontinued and replaced by the Vaisala Indigo80 handheld indicator with an HMP80 probe.
- Legacy MI70 handheld indicator with HMP75, HMP76 or HMP77 probe
- Relative-humidity measurement from 0 to 100 %RH
- Probe-dependent temperature measurement from −70 to +180 °C
- Numerical and graphical display with portable data recording
- Current replacement: Indigo80 with HMP80N or HMP80L
- HMP80N for general measurements; HMP80L for extended temperature reach
16 other products in the same category:
The Vaisala Indigo80 is a robust handheld indicator and data logger for industrial spot checks, process diagnostics, field calibration and measurement data analysis.
- Connect and display measurements from up to two compatible probes
- Measure humidity, temperature, dew point, carbon dioxide and other industrial parameters
- Use with HMP80, DMP80 and GMP80P portable measurement probes
- Record up to approximately 5.5 million real-time measurement values
The Sato SK-L200TH II temperature and humidity data logger is discontinued. The replacement is the Sato SK-L754, selected with a compatible temperature and humidity probe.
- Electronic temperature and humidity recording.
- 16,000 stored readings per channel.
- USB communication and microSD data transfer.
- Choice of plug-in or cabled probe, purchased separately.
Sato SK-170GT WBGT Heat Stress Monitor is a portable all-in-one instrument for assessing heat stress in indoor and outdoor working environments.
It measures and displays the WBGT index, ambient temperature, globe temperature and relative humidity. Its built-in black globe detects radiant heat from direct sunlight, hot machinery and surrounding surfaces.
- WBGT, temperature, globe temperature and humidity measurement
- Selectable indoor and outdoor WBGT modes
- Conforms to JIS B 7922 Class 2 based on ISO 7243
- Adjustable WBGT alarm with approximately 75 dB buzzer
- MAX/MIN, display hold and automatic power-off
- Wind-speed compensation setting
- Optional RS-232C connection for real-time PC monitoring
- Tripod mounting hole and carrying case included
The Vaisala VDL200 is a secure Power-over-Ethernet data logger for monitoring temperature, relative humidity, carbon dioxide and analog or Boolean inputs in controlled and GxP-regulated environments.
Designed for the Vaisala viewLinc Continuous Monitoring System, the VDL200 combines interchangeable smart probes, onboard memory and battery backup to provide reliable, gap-free environmental monitoring.
The Vaisala HM70 was a handheld meter for humidity and temperature spot checks, field measurements, data logging and verification of installed Vaisala instruments. It is discontinued and replaced by the Vaisala Indigo80 handheld indicator with an HMP80 probe.
- Legacy MI70 handheld indicator with HMP75, HMP76 or HMP77 probe
- Relative-humidity measurement from 0 to 100 %RH
- Probe-dependent temperature measurement from −70 to +180 °C
- Numerical and graphical display with portable data recording
- Current replacement: Indigo80 with HMP80N or HMP80L
- HMP80N for general measurements; HMP80L for extended temperature reach
The Sekonic SP-100 is a portable universal 6-channel chart recorder for temperature and process signals.
- Thermocouple, Pt100, DC voltage and 4–20 mA inputs.
- Colour chart recording with configurable ranges and scaling.
- Selectable chart speeds and recording formats.
- Optional memory-card recording.
Discontinued model. Contact Seacom for availability, pricing and configuration details.
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 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 Sato Thermohygrograph Sigma II NSII-Q continuously records temperature and relative humidity on an easy-to-read paper chart, providing a visible record without requiring a computer or network.
- Temperature ranges of −15 to +40 °C or −10 to +50 °C
- Relative-humidity range from 0 to 100 %RH, non-condensing
- Selectable 1-day, 7-day or 32-day chart rotation
- Transparent cover allows the chart to be viewed while closed
- Battery-powered quartz clock with no external supply required
- Suitable for warehouses, laboratories, clean areas and production rooms
The Sato HIGHEST II combines a dial hygrometer and digital thermometer for convenient local checks of room temperature and humidity.
- Humidity range: 20 to 100% RH.
- Temperature range: 0 to 50°C.
- Human hair humidity sensor and thermistor temperature sensor.
- 2% RH dial graduations and 0.1°C temperature display resolution.
- 135 mm diameter body with wall-mount bracket.
- Powered by one AA battery.
The Vaisala DL2000 combines precision temperature and relative-humidity monitoring with optional analog or door-contact inputs for viewLinc systems.
- Scheduled for future discontinuation; confirm availability before specifying
- Current replacement platform: Vaisala VDL200 with suitable smart probes
- Internal temperature and relative-humidity measurement
- Optional current, voltage or Boolean input configurations
- Onboard memory and a typical 10-year battery life
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
- Supports 11, 33, 75, 85 and 97 %RH nominal reference points
- Typically stabilises in 10 to 30 minutes when temperatures are equal
- Certified, ready-dosed salt packages are available
- Basic and universal chamber lids suit several probe diameters
- No electrical power or external humidity generator required
The Vaisala RFL100 uses secure, long-range VaiNet wireless technology to monitor temperature, relative humidity and carbon dioxide with the AP10 Access Point and viewLinc Continuous Monitoring System.
- At least 50 m typical indoor wireless range
- Up to 32 RFL100 data loggers per AP10
- 30 days of local measurement memory
- Approximately 18 months of battery operation for temperature and humidity monitoring
The Sekonic ST-50M digital thermohygrograph is discontinued. It combined temperature and humidity measurement with paper chart recording and SD-card storage.
- Paper records: consider the Sato Sigma II NSII-Q.
- Electronic records: consider the Sato SK-L754 temperature and humidity data logger.
- Centralised monitoring and alarms: consider Vaisala RFL100, AP10 and viewLinc.
Contact Seacom to match the replacement to your recording requirements. Features and accessories differ from the original ST-50M.
Dickson round chart recorders provide a visible paper record of temperature or temperature and humidity for routine inspection and filing.
- 3-inch SC3: compact temperature recorder
- 4-inch SL4: temperature recorder with digital display
- 8-inch KT8: temperature recording with sensor and channel options
- 8-inch TH8: temperature and relative humidity recording
- Replacement selection assistance for older KT6, TH6, KT8P, KT856 and TH8P models
Send your existing model number, measurement range and chart reference so we can help identify a suitable configuration.
The Sato Mini-Cube 7008-10 records temperature and relative humidity on a seven-day paper chart for routine inspection and filing.
- Temperature range: −15 to 40°C.
- Humidity range: 5 to 100%RH, non-condensing.
- Quartz-controlled seven-day chart rotation.
- Replaceable cartridge pens.
- Powered by one AA zinc-carbon battery.
- Supplied with 55 sheets of seven-day chart paper.