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DeFelsko PosiTector DPM

Measures and records climatic conditions including: relative humidity, air temperature, surface temperature, dew point temperature, wind speed, and difference between surface and dew point temperatures.

Ideal for surface preparation as required by ISO 8502-4, BS 7079-B4, ASTM D3276, IMO PSPC, SSPC-PA7, and US Navy NSI 009-32.

  • NEW Larger 2.8" impact resistant color touchscreen with redesigned keypad for quick menu navigation
  • NEW Weatherproof, dustproof, and water-resistant - IP65-rated enclosure
  • Fast response precision sensors provide accurate, repeatable readings
  • Auto Log mode records environmental parameters at user selected time intervals
  • PosiTector interchangeable platform - attach any PosiTector probe to a single gage body
  • USB, WiFi, and Bluetooth connectivity to PosiSoft PC, Mac, and Smartphone software
  • Certificate of Calibration showing traceability to NIST included (Long Form)

Conforms to ISO 8502-4, BS 7079-B4, ASTM D3276, IMO PSPC, SSPC-PA7, US Navy NSI 009-32, and Navy NAVSEA 009-32


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DeFelsko PosiTector DPM Standard Dew Point Meters: 5 Models Available
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DeFelsko PosiTector DPM1 Dew Point MetersDeFelsko PosiTector DPMIR1 Dew Point MetersDeFelsko PosiTector DPMS1 Dew Point MetersDeFelsko PosiTector DPMA1 Dew Point MetersDeFelsko PosiTector DPMD1 Dew Point Meters
PROBE DESCRIPTIONPROBE DESCRIPTIONPROBE DESCRIPTIONPROBE DESCRIPTIONPROBE DESCRIPTION
Integral ProbeIntegral Probe with Infrared Surface Temperature SensorIntegral Probe with Cabled Surface Temperature Sensor Integral Probe with Wind Speed SensorCabled Probe with 1/2" NPT Threads
MEASURED PARAMETERS MEASURED PARAMETERS MEASURED PARAMETERS MEASURED PARAMETERS MEASURED PARAMETERS
Surface TemperatureSurface TemperatureSurface TemperatureSurface Temperature---
Air TemperatureAir TemperatureAir TemperatureAir TemperatureAir Temperature
Relative HumidityRelative HumidityRelative HumidityRelative HumidityRelative Humidity
Dew Point TemperatureDew Point TemperatureDew Point TemperatureDew Point TemperatureDew Point Temperature
Surface Temperature minus Dew Point TemperatureSurface Temperature minus Dew Point TemperatureSurface Temperature minus Dew Point TemperatureSurface Temperature minus Dew Point Temperature---
---------Wind Speed---


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DeFelsko PosiTector DPM Advanced Dew Point Meters: 5 Models Available
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DeFelsko PosiTector DPM3 Dew Point MetersDeFelsko PosiTector DPMIR3 Dew Point MetersDeFelsko PosiTector DPMS3 Dew Point MetersDeFelsko PosiTector DPMA3 Dew Point MetersDeFelsko PosiTector DPMD3 Dew Point Meters
PROBE DESCRIPTIONPROBE DESCRIPTIONPROBE DESCRIPTIONPROBE DESCRIPTIONPROBE DESCRIPTION
Integral ProbeIntegral Probe with Infrared Surface Temperature SensorIntegral Probe with Cabled Surface Temperature Sensor Integral Probe with Wind Speed SensorCabled Probe with 3/2" NPT Threads
MEASURED PARAMETERS MEASURED PARAMETERS MEASURED PARAMETERS MEASURED PARAMETERS MEASURED PARAMETERS
Surface TemperatureSurface TemperatureSurface TemperatureSurface Temperature---
Air TemperatureAir TemperatureAir TemperatureAir TemperatureAir Temperature
Relative HumidityRelative HumidityRelative HumidityRelative HumidityRelative Humidity
Dew Point TemperatureDew Point TemperatureDew Point TemperatureDew Point TemperatureDew Point Temperature
Surface Temperature minus Dew Point TemperatureSurface Temperature minus Dew Point TemperatureSurface Temperature minus Dew Point TemperatureSurface Temperature minus Dew Point Temperature---
---------Wind Speed---


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DeFelsko PosiTector DPM Probe Only Dew Point Meters: 5 Models Available
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DeFelsko PRBDPM PosiTectorDew Point MetersDeFelsko PRBDPMIR PosiTectorDew Point MetersDeFelsko PRBDPMS PosiTectorDew Point MetersDeFelsko PRBDPMA PosiTectorDew Point MetersDeFelsko PRBDPMD PosiTectorDew Point Meters
PROBE DESCRIPTIONPROBE DESCRIPTIONPROBE DESCRIPTIONPROBE DESCRIPTIONPROBE DESCRIPTION
Integral ProbeIntegral Probe with Infrared Surface Temperature SensorIntegral Probe with Cabled Surface Temperature Sensor Integral Probe with Wind Speed SensorCabled Probe with 3/2" NPT Threads
MEASURED PARAMETERS MEASURED PARAMETERS MEASURED PARAMETERS MEASURED PARAMETERS MEASURED PARAMETERS
Surface TemperatureSurface TemperatureSurface TemperatureSurface Temperature---
Air TemperatureAir TemperatureAir TemperatureAir TemperatureAir Temperature
Relative HumidityRelative HumidityRelative HumidityRelative HumidityRelative Humidity
Dew Point TemperatureDew Point TemperatureDew Point TemperatureDew Point TemperatureDew Point Temperature
Surface Temperature minus Dew Point TemperatureSurface Temperature minus Dew Point TemperatureSurface Temperature minus Dew Point TemperatureSurface Temperature minus Dew Point Temperature---
---------Wind Speed---


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DeFelsko PosiTector DPMDew Point Meters for Environmental Monitoring Videos
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PosiSoft Suite of Software
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Four FREE and unique ways to view and report your PosiTector and PosiTest data. Learn More

  • PosiSoft Desktop
  • PosiSoft.net
  • PosiTector App
  • PosiSoft USB


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Do your instruments require any formal training for use? Do you offer ‘demo’ models?

No. Our instruments are designed for simple operation, feature easy-to-use menus, both full and quick instruction manuals, and helpful videos. In lieu of demonstration models, we provide unlimited technical support via telephone and/or email, and a limited 30-day money back guarantee.

Is the PosiTector DPM calibrated at the factory?

The PosiTector DPM arrives fully calibrated and ready to measure. A Long-Form Certificate of Calibration traceable to NIST or PTB is included, which documents actual readings taken by your instrument at our calibration laboratory on standards traceable to a national metrology institute. Beware of ‘Certificates’ or ‘Certificates of Conformance’ offered by competitors. These typically do not include actual instrument readings, and are often insufficient to meet common quality requirements.

Does the PosiTector DPM provide a wet-bulb temperature measurement?

Yes. When combined with either a PosiTector Advanced gage body or PosiTector SmartLink wireless probe adapter, the DPM will indicate a wet-bulb temperature measurement.

Is the PosiTector DPM suitable for applications with low or negative dew point temperatures?

The PosiTector DPM provides accurate dew point readings (±3° C) down to -40° C.

Dew point is a calculated value, based on temperature and humidity. At low negative dew point temperatures, the calculation is highly dependent on relative humidity and changes of ±3% RH (the tolerance of the PosiTector DPM’s humidity sensor) can have a significant impact on the dew point temperature.

The Dew Point (Td) Accuracy page details the accuracy of the calculated dew point temperature based on the measured temperature and humidity.

Is the PosiTector DPM suitable for high pressure environments?

Yes. The PosiTector DPMD is specifically designed for use in pressurized environments (max 200 psi / 1.3 MPa) and has ½” NPT threads for secure installation on pipes and tanks.

Will any k-type thermocouple work with the PosiTector DPMS?

The PosiTector DPMS Magnetic Surface Temperature Sensor can be disconnected from the K-Type thermocouple connector and replaced with any K-type thermocouple.

DeFelsko offers the following optional k-type sensors:

  • Hand-held Surface Temperature probe: for spot-checking difficult-to-access areas.
  • Liquid Temperature Probe: general purpose probe with stainless steel shaft.

How long does it take the probe to acclimate, and provide accurate measurements in a new environment?

The PosiTector DPM, like other electronic dew point meters, requires adequate time to acclimate to its operating environment. When moving between similar environments, the instrument will stabilize in a matter of seconds. However, when moving between environmental extremes (like between a dry, air conditioned vehicle and the warm, humid outdoors) it can take up to 30 minutes for readings to stabilize.

If left in a dry environment for an extended period of time, this stabilization process may take longer. To restore the original response time, wrap the sensor in a damp cloth overnight.

Is the PosiTector DPM accurate in freezing temperatures?

The PosiTector DPM can accurately measure air temperature (Ta) as low as -40° C.

Is the PosiTector DPM suitable for logging temperatures inside an oven?

We do not recommend our PosiTector DPM for operation in an oven. Delicate internal components and assembly materials are prone to premature damage when subjected to prolonged use in a closed environment with temperatures greater than approximately 50° C.

How often should the PosiTector probe be recalibrated?

PosiTector probes include a Certificate of Calibration with no expiry or end date. They have no shelf life, therefore the length of time in the field is not a good indicator for recalibration intervals. Many organizations with quality programs and recertification programs require annual recalibrations, and this is a good starting point for most users. DeFelsko recommends that customers establish calibration intervals based upon their own experience and work environment. Based on our product knowledge, data and customer feedback, a one year calibration interval from the date the instrument was placed in service is a good starting point.