Vaisala DMP7 Dew Point & Temperature Probe


  • Dew point measurement range −70 … +80 °C (−94 … +176 °F) Td/f
  • Dew point measurement accuracy up to ±2 °C (±3.6 °F) Td/f
  • Sensor purge provides superior chemical resistance
  • Tolerates condensation, oils, dust, and most chemicals
  • Modbus RTU over RS-485
  • Compatible with Indigo transmitters and Insight PC software
  • Traceable calibration certificate

Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensors solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

Vaisala DRYCAP Dew Point and Temperature Probe DMP7 is made for tight spaces and low-humidity applications. Its short probe length makes it suitable for installations that have limited space such as semiconductor manufacturing equipment. Other typical applications include industrial drying systems, compressed air systems, and dry rooms. DMP7 is part of the Indigo family and is compatible with Indigo500 and Indigo200 series transmitters. It can be used with the Vaisala Insight PC software for data visualization, easy probe configuration, and self-calibration.


Key Benefits

Designed for remote installations in tight spaces

DMP7 has a short probe length (41 mm / 1.61 inches) that allows it to be used in installations where space is limited. It also comes with a pressure-tight Swagelok fitting, making it suitable for installations with pressure between 0 … 10 bar/0 … 145 psi.

Fast reaction time and stability at low dew points

The Vaisala DRYCAP sensor is immune to particulate contamination, water condensation, oil vapor, and most chemicals. The sensor is condensation-resistant and recovers perfectly if exposed to water. Its fast reaction time and dependable stability give it unmatched performance even in dynamic and low dew point applications.

Use standalone or with an Indigo Transmitter

Its measurement intelligence and digital Modbus RTU over RS-485 connection within the probe mean that the DMP7 can be used as a standalone device. It can also be easily integrated into other systems. DMP7 is part of the Vaisala Indigo family, so it can be used with Vaisala Indigo series transmitters. The transmitters offer various additional benefits such as a display for data visualization, easy access to probe configuration, and more extensive options for connectivity, supply voltage, and wiring. Whether using the DMP7 on its own or with an Indigo transmitter, it can be connected to the free Vaisala Insight software for easy field calibration, probe configuration, and device analytics.


Measurement Performance
Dew point
Sensor DRYCAP 180M
Measurement range −70 … +80 °C (−94 … +176 °F) Td/f
Measurement range for continuous use −70 … +45 °C (−94 … +113 °F) Td/f
Accuracy Up to ±2 °C (±3.6 °F) Td/f See accuracy graph
Response time 63 % [90 %] 1)
From dry to wet 5 s [15 s]
From wet to dry 45 s [8 min]
Measurement range 0 … +80 °C (+32 … +176 °F)
Accuracy ±0.2 °C at room temperature
Temperature sensor Pt100 RTD Class F0.1 IEC 60751
Relative Humidity
Measurement range 0 … 70 %RH
Accuracy (RH <10 %RH, at + 20 °C) ±0.004 %RH + 20% of reading
Concentration by volume (ppm)
Measurement range (typical) 10 … 2500 ppm
Accuracy (at + 20 °C, 1 bar) 1 ppm + 20% of reading
1) Tested with sintered filter.
Operating Environment
Operating temperature for probe head −40 … +80 °C (−40 … +176 °F)
Operating temperature for probe body −40 … +80 °C (−40 … +176 °F)
Storage temperature −40 … +80 °C (−40 … +176 °F)
Operating pressure for probe head 0 … 10 bar (0 … 145 psia)
Measurement environment For air, nitrogen, hydrogen, argon, helium, oxygen 1), and vacuum
IP rating for probe body IP66
1) Consult Vaisala if other chemicals are present. Consider safety regulations with flammable gases.
Inputs & outputs
Operating voltage 15 … 30 V DC
Current consumption 10 mA typical, 500 mA max
Digital output RS-485, non-isolated
Protocols Modbus RTU
EU directives EMC Directive (2014/30/EU)
RoHS Directive (2011/65/EU)
EMC compatibility EN 61326 1, industrial environment
Compliance marks CE, China RoHS, RCM
Output Parameters
Absolute humidity (g/m3) Relative humidity (%RH)
Absolute humidity at NTP (g/m3) Relative humidity (dew/frost) (%RH)
Dew point temperature (°C) Temperature (°C)
Dew/frost point temperature (°C) Water concentration (ppmv)
Dew/frost point temperature at 1 atm (°C) Water concentration (wet basis) (vol %)
Dew point temperature at 1 atm (°C) Water mass fraction (ppmw)
Dew point temperature difference (°C) Water vapor pressure (hPa)
Enthalpy (kJ/kg) Water vapor saturation pressure (hPa)
Mixing ratio (g/kg)
Mechanical Specifications
Connector M12 5-pin A-coded male
Weight 310 g (10.9 oz) with 2 m (6.56 ft) cable
Probe AISI 316L
Probe body AISI 316L
Cable jacket FEP
Swagelok ISO 3/8″ SWG12ISO38
Swagelok ISO 1/2″ SWG12ISO12
Swagelok NPT 1/2″ SWG12NPT12
Indigo USB adapter 1) USB2
1) Vaisala Insight software for Windows available at


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