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Vaisala HMP7 High-Humidity and Temperature Probe
The Vaisala HMP7 is designed for continuously humid, rapidly changing and near-condensing environments. Probe heating helps prevent condensation while maintaining reliable process measurement.
- Humidity accuracy up to ±0.8% RH
- Probe heating for condensation prevention
- −70 to +180 °C probe-head measurement range
- Standalone Modbus RTU or Vaisala Indigo transmitter operation
Vaisala HMP7 Probe for High Humidity and Condensing Conditions
The Vaisala HUMICAP® Humidity and Temperature Probe HMP7 is designed for constant high humidity, rapid humidity changes and environments where condensation on an unheated sensor would interrupt reliable measurement.
Typical applications include drying and test chambers, combustion air, industrial humidifiers, environmental chambers, meteorological installations and other demanding processes operating close to saturation.
The HMP7 can heat the complete probe head above the process dew-point temperature. This prevents condensation from forming on the sensing surface and allows the probe to continue measuring the process dew point during extremely humid conditions.
For calculated relative humidity at the actual process temperature while probe heating is active, use an external temperature reference such as the Vaisala TMP1 temperature probe. An Indigo520 can combine both probe inputs in one transmitter.
Why Choose the Vaisala HMP7?
- Continuous High-Humidity Measurement: Designed for processes operating near saturation or subject to rapid humidity changes.
- Heated Probe Head: Heating the complete sensing head above the dew point helps prevent condensation on the probe.
- High Measurement Accuracy: Provides humidity accuracy up to ±0.8% RH and temperature accuracy up to ±0.1 °C under specified conditions.
- Wide Temperature Range: The probe head measures from −70 to +180 °C.
- Vapour- and Pressure-Proof Construction: Suitable for demanding process and outdoor measurement environments at pressures below 10 bar.
- Sensor Purge: Available sensor options use periodic heating to reduce contamination from chemicals and cleaning agents.
- H₂O₂-Resistant Sensor Option: The HUMICAP 180VC option supports applications involving vaporised hydrogen peroxide, subject to its specified operating limitations.
- Standalone Modbus RTU: Built-in RS-485 communication supports direct integration with an automation system.
- Indigo Compatibility: Add display, analog outputs, relays, Ethernet, Modbus TCP and dual-probe temperature compensation using a compatible Indigo transmitter.
- Traceable Calibration: Supplied with a certificate covering six humidity points and one temperature point.
How HMP7 Probe Heating Prevents Condensation
Condensation occurs when the sensor surface temperature falls to the process dew-point temperature. HMP7 probe heating raises the entire probe head above the dew point so that liquid water does not form on the sensor.
| Operating Mode | Measurement Behaviour |
|---|---|
| Probe Heating Off | The HMP7 directly measures relative humidity and temperature at the probe head under normal non-condensing conditions |
| Probe Heating On | The probe head is maintained above the process dew point, preventing condensation while the probe measures water-vapour conditions |
| Heated HMP7 with External Temperature | Process temperature from a separate probe can be used to calculate true RH at the actual process temperature |
| Recommended Dual-Probe System | HMP7 and TMP1 connected to an Indigo520 transmitter |
Important: When probe heating changes the temperature of the HMP7 sensing head, the probe-head temperature is not the same as the actual process temperature. Use an external temperature reference when accurate process RH calculation is required during heating.
Recommended HMP7 and TMP1 Configuration
| Component | Function | Product Link |
|---|---|---|
| Vaisala HMP7 | Heated humidity probe measures water-vapour conditions without condensation on the sensor | Current product |
| Vaisala TMP1 | Provides the actual process temperature used for RH calculation | Vaisala TMP1 |
| Vaisala Indigo520 | Accepts both probes and provides display, calculation, outputs, relays and Ethernet connectivity | Vaisala Indigo520 |
HMP7 Measurement Performance
| Measurement Specification | Performance |
|---|---|
| Relative-Humidity Range | 0–100% RH, at a maximum dew-point temperature of +95 °C |
| RH Accuracy at +23 °C | ±0.8% RH from 0–90% RH |
| RH Factory-Calibration Uncertainty | ±0.5% RH from 0–40% RH; ±0.8% RH from 40–95% RH |
| RH Response Time | 15 seconds, T63 |
| Humidity Sensor Options | HUMICAP® R2, HUMICAP® R2C or HUMICAP® 180VC |
| Temperature Range | −70 to +180 °C |
| Temperature Accuracy at +23 °C | ±0.1 °C |
| Temperature Factory-Calibration Uncertainty | ±0.1 °C at +23 °C |
| Temperature Sensor | Pt100 RTD Class F0.1 according to IEC 60751 |
Operating Environment
| Environmental Specification | Operating Limit |
|---|---|
| Operational Pressure | Below 10 bar |
| Probe-Head Temperature | −70 to +180 °C |
| Probe-Body Temperature | −40 to +80 °C |
| Probe-Head Humidity Limit | Maximum +100 °C dew-point temperature |
| Storage Temperature | −40 to +80 °C |
| Measurement Media | Air, nitrogen, hydrogen, argon, helium, oxygen and vacuum; consult Vaisala for other chemicals |
| Operating Environment | Suitable for outdoor use |
| Probe-Body Protection | IP66 |
Electrical and Communication Specifications
| Feature | Specification |
|---|---|
| Operating Voltage | 18–30 V DC |
| Typical Current Consumption | 10 mA |
| Maximum Current Consumption | 500 mA |
| Digital Interface | RS-485, non-isolated |
| Communication Protocol | Modbus RTU |
| Electrical Connector | M12 five-pin A-coded male |
Mechanical Specifications
| Mechanical Feature | Specification |
|---|---|
| Probe-Head Diameter | 12 mm |
| Probe-Head Length | Approximately 99.5 mm |
| Probe Material | AISI 316L stainless steel |
| Probe-Body Material | AISI 316L stainless steel |
| Cable Jacket | FEP |
| Available Cable Lengths | 0.15 m, 2 m or 10 m |
| Approximate Weight | 310 g with a 2 m cable |
Measured and Calculated Parameters
- Relative humidity
- Temperature
- Absolute humidity
- Dew point and dew/frost point temperature
- Wet-bulb temperature
- Enthalpy
- Mixing ratio
- Water-vapour pressure
- Water concentration and water mass fraction
Compatible Vaisala Indigo Transmitters
| Transmitter | Recommended Configuration | Product Link |
|---|---|---|
| Indigo200 Series | Standard single-probe system with display and analog, relay or Modbus options | Vaisala Indigo200 |
| Indigo300 | Rugged IP66 metal transmitter for one probe and up to three analog outputs | Vaisala Indigo300 |
| Indigo510 | Simplified flagship for one probe with isolated outputs, Ethernet and Modbus TCP | Vaisala Indigo510 |
| Indigo520 | Recommended dual-probe system for HMP7 plus TMP1 process-temperature compensation | Vaisala Indigo520 |
The distance between the HMP7 and a compatible Indigo transmitter can be extended to approximately 30 m using the correct Vaisala cable arrangement.
View the Vaisala Indigo80 Portable Meter
Common HMP7 Applications
- High-Humidity Test Chambers: Maintaining reliable measurement during rapid changes and near-saturated conditions.
- Industrial Humidifiers: Monitoring humid air where condensation on an unheated sensor is likely.
- Drying Chambers: Measuring humidity across changing process stages, including high-humidity portions of the cycle.
- Combustion Air: Humidity and temperature measurement in demanding intake-air conditions.
- Meteorological Measurement: Outdoor humidity monitoring using the appropriate radiation shield and mounting accessories.
- Bio-Decontamination: Suitable configurations using the H₂O₂-resistant HUMICAP 180VC sensor.
- Environmental Chambers: Condensation-resistant monitoring in validation, research and product testing.
- Fuel Cells and Humidified Gas Systems: High-humidity gas measurement following application and material-compatibility review.
Installation Accessories
| Accessory | Purpose |
|---|---|
| Duct Installation Kit 210697 | Adjustable installation in ventilation ducts and chambers |
| DTR502B Radiation Shield | Protection for suitable outdoor meteorological measurement |
| HMT330WPA Warmed-Probe Accessory | Mechanical support for applicable warmed-probe installations |
| Swagelok Fittings | Pressure-tight installation of the 12 mm probe into compatible process connections |
| Magnetic Probe Holder ASM213382SP | Temporary or service mounting where temperature conditions permit |
| Indigo USB Adapter USB2 | Connection to Vaisala Insight PC software |
| HMK15 Calibration Adapter 211302SP | Supports salt-bath humidity calibration |
Calibration and Maintenance
The HMP7 is calibrated and adjusted before delivery. Calibration and adjustment can be performed using Vaisala Insight PC software, a compatible Indigo transmitter or an Indigo80 handheld indicator.
Before calibration, allow the probe to stabilise and ensure that heating or purge cycles are not active unless the calibration procedure specifically requires them. Determine the calibration interval according to process severity, contamination, required uncertainty and quality-system requirements.
Use Vaisala HMP Probes with Indigo80
Vaisala HMP1, HMP3, HMP4, HMP5, HMP7, HMP8 and HMP9 can be connected to the Vaisala Indigo80 Handheld Indicator using a compatible connection cable.
Portable measurement and field servicing: use Indigo80 to display live humidity and temperature readings, record measurement data, check probe performance, configure settings, and perform field calibration and adjustment. The same Indigo80 can support different compatible probes, making it practical for servicing multiple measurement points.
Which Vaisala HMP Probe Should You Choose?
Vaisala Indigo-compatible HMP probes share the same measurement platform, but their mechanical design and installation method suit different conditions. Use the table below to identify the best starting point for your application.
| Probe | Main strength | Recommended application | Product |
|---|---|---|---|
| HMP1 | Compact wall-mounted probe for indoor environments | Cleanrooms, laboratories, data centres, warehouses and demanding HVAC | Vaisala HMP1 |
| HMP3 | Field-maintainable general-purpose 12 mm probe | Ducts, chambers, paint booths, air-handling units and industrial HVAC | Vaisala HMP3 |
| HMP4 | High-pressure measurement up to 100 bar | Compressed air, breathing air, industrial gases and vacuum systems | Vaisala HMP4 |
| HMP5 | Long probe for high temperatures up to +180 °C | Ovens, kilns, baking processes and high-temperature dryers | Vaisala HMP5 |
| HMP7 | Heated probe for continuous high humidity | Near-condensing chambers, humidifiers, drying processes and other persistently humid conditions | Vaisala HMP7 |
| HMP8 | Adjustable-depth probe for pressurised pipelines | Compressed-air lines, refrigerant dryers and industrial pipelines requiring easy probe removal | Vaisala HMP8 |
| HMP9 | Compact 5 mm probe head with fast response | Tight spaces, rapidly changing air, compact equipment, ducts and data centres | Vaisala HMP9 |
Vaisala HMP7 Supplier in Malaysia
Seacom Process Instruments supplies and supports the Vaisala HMP7 high-humidity and temperature probe in Malaysia for chambers, humidifiers, drying systems, combustion air, meteorological measurement and near-condensing industrial processes.
Our team can assist with selecting the humidity sensor, probe-heating configuration, cable length, installation accessory, TMP1 temperature reference and Indigo transmitter required for the application.
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