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HM70 catalogue
Advanced Portable Humidity Meter With Remote Probe HM70
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Vaisala HM70 Portable Humidity and Temperature Meter – Discontinued
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
Product status: The Vaisala HM70, MI70 indicator and HMP75/HMP76/HMP77 probe platform are discontinued. For new portable humidity and temperature applications, use the Vaisala Indigo80 with HMP80.
Vaisala HM70 for Existing Portable Humidity Applications
The Vaisala HM70 combined the MI70 handheld indicator with a remote HMP75, HMP76 or HMP77 probe. It was designed for portable relative-humidity and temperature measurement, process spot checks, temporary data recording and field verification of installed humidity transmitters.
HM70 displayed measured and calculated humidity parameters numerically or graphically. Depending on the selected probe, it could be used in ambient conditions, ducts, chambers, industrial processes and high-temperature measurement locations.
Legacy HM70 Probe Options
| Legacy probe | Temperature range | Construction | Typical application |
|---|---|---|---|
| HMP75 | −20 to +60 °C | Short general-purpose probe | Ambient measurements, accessible spaces and routine field checks |
| HMP76 | −50 to +120 °C; up to +180 °C for short periods | Long stainless-steel probe | Ducts, chambers and processes requiring additional insertion reach |
| HMP77 | −70 to +180 °C | Cabled probe with a remote sensing section | Demanding process locations and high or low temperatures |
All three probes measured 0 to 100 %RH. The HM70 platform also provided calculated parameters including dew point, frost point, absolute humidity, mixing ratio, wet-bulb temperature, water-vapour pressure and enthalpy.
Current Replacement: Indigo80 with HMP80
The current portable platform uses the Indigo80 handheld indicator with an HMP80 series humidity and temperature probe. Indigo80 provides the display, two probe connections, data logging, diagnostics and supported field-calibration functions, while the selected HMP80 performs the measurement.
| Component | Main function | Selection guidance |
|---|---|---|
| Indigo80 | Portable display, two-device connection, data logger, diagnostics and calibration interface | Current handheld platform for compatible Vaisala smart probes |
| HMP80N | Humidity and temperature probe with a normal-length sensing section | Choose for general spot checks, field calibration and accessible measurement locations |
| HMP80L | Long humidity and temperature probe for a wider process-temperature range | Choose when additional insertion reach or more demanding temperature exposure is required |
Explore the Vaisala Indigo80 and HMP80 portable system
HM70 and Indigo80 with HMP80 Comparison
| Comparison point | HM70 | Indigo80 with HMP80 |
|---|---|---|
| Product status | Discontinued | Current portable platform |
| Handheld indicator | MI70 | Indigo80 |
| Humidity probes | HMP75, HMP76 or HMP77 | HMP80N or HMP80L |
| Relative-humidity range | 0 to 100 %RH | 0 to 100 %RH |
| Best stated RH accuracy | Up to ±1 %RH at +15 to +25 °C and 0 to 90 %RH | Up to ±0.8 %RH at +23 °C and 0 to 90 %RH |
| Temperature options | Probe-dependent range from −70 to +180 °C | HMP80N: −20 to +60 °C; HMP80L: −50 to +120 °C |
| Simultaneous devices | Up to two compatible MI70 devices, configuration-dependent | Up to two compatible probes or transmitters |
| Display | Legacy numerical and graphical display | Modern colour numerical and graphical display |
| Data logging | MI70 onboard recording | Up to approximately 5.5 million real-time data values |
| Computer connection | Legacy MI70 Link and connection cable | USB-C and Vaisala Insight PC software |
| Power | MI70 rechargeable battery or AC adapter | Rechargeable lithium-ion battery with USB-C charging |
HM70 to HMP80 Probe Migration
| Existing HM70 probe | Current starting point | Migration consideration |
|---|---|---|
| HMP75 | Indigo80 with HMP80N | Suitable starting point for general portable measurements and routine field checks |
| HMP76 | Indigo80 with HMP80L | Review insertion length, process opening and maximum continuous temperature |
| HMP77 | Application-specific review | The legacy remote sensing geometry is not automatically reproduced by HMP80; check installation access and cable routing |
Not necessarily a mechanical drop-in replacement: HMP80 uses different probe dimensions, connection cables and accessories from the HM70 probe family. Confirm the measurement location, insertion depth, cable routing, temperature exposure and field-check method before ordering.
Typical Portable Humidity Measurement Uses
- Spot-checking relative humidity and temperature in production areas
- Comparing an installed transmitter against a portable reference
- Checking ducts, chambers, dryers and controlled environments
- Temporary trend recording during process investigation
- Supported field calibration and adjustment of compatible Vaisala instruments
- Commissioning and troubleshooting humidity measurement points
Using Indigo80 Beyond Humidity Measurement
Indigo80 accepts up to two compatible devices simultaneously. In addition to HMP80 humidity probes, it can be used with selected Vaisala probes and transmitters for dew point, carbon dioxide, vaporised hydrogen peroxide, moisture in oil and other industrial parameters.
This allows one handheld platform to support several field-measurement and diagnostic tasks. Probe compatibility, connection cable and supported calibration functions should still be checked for each device.
Existing HM70 Equipment
A functioning HM70 does not need to be removed solely because the model is discontinued. Keep the indicator, probes, connection cables, calibration certificates, order codes and user documentation together while the system remains in service.
For measurements affecting product quality or compliance, check calibration and repair availability before relying on the legacy system. Replacement planning should consider probe condition, battery condition, accessory availability and the criticality of the measurement.
Vaisala HM70 Support and Indigo80 Replacement in Malaysia
Seacom Process Instruments supports existing Vaisala HM70 portable humidity meters in Malaysia and supplies the current Indigo80 and HMP80 platform for industrial spot checks, process investigation, field calibration and temporary data logging.
Our team can assist with selecting HMP80N or HMP80L, checking probe reach and temperature exposure, choosing connection cables and accessories, configuring Indigo80, planning field checks and arranging calibration.
Contact Seacom with your humidity and temperature range, measurement location, required insertion depth, existing HM70 probe model and calibration requirements so we can recommend a suitable migration arrangement.
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The Vaisala DM70 was a portable meter for dew-point spot checks, process measurements and data logging. It is discontinued and replaced for general dew-point work by the Vaisala Indigo80 handheld indicator with a DMP80A or DMP80B probe.
- Legacy DMP74A, DMP74B and SF₆-specific DMP74C probe options
- Direct or sampled measurement in pressurised processes
- Portable numerical and graphical display with data logging
- Current replacement: Indigo80 with DMP80A or DMP80B
- DMP80A for moderate dew points down to −40 °C Td/f
- DMP80B for dry applications down to −70 °C Td/f
16 other products in the same category:
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 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 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 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 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.
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
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 Sekonic ST-50A displays temperature and relative humidity and records both on a continuous paper chart.
- Electronic temperature and humidity sensing with LCD display.
- Optional extension cables for remote sensor placement.
- Battery operation or a suitable external DC supply.
- Desktop or wall-mounted installation.
Being phased out: confirm availability before ordering. Alternatives include the Sato Sigma II for paper records, Sato SK-L754 for electronic logging and Vaisala viewLinc for centralised monitoring.
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 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.
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.
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
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 Sato Mini-Alpha 7006-00 is a compact thermohygrograph that records temperature and relative humidity on a seven-day paper chart.
- Temperature range: −15 to 50°C.
- Humidity range: 10–100% RH.
- Quartz drum drive powered by one AA battery.
- Desktop or wall-mounted use; approximately 0.8 kg.
- Replaceable chart paper and cartridge pens.
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 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.