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PT-DPMD1 Environment Meter / Dew Point Meter, Standard Model with Separate Probe with 1/2" NPT Threads - DPMD1-G

Made in USA-Defelsko
PT-DPM Environment and Dew Point Meter with Integral Probe
Click images to enlarge.
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.

Not for designed for use in pressurized systems.

Model Comparison

DPM Model comparison

Ordering Guide

Step 1: Select a body

Feature Comparison Chart Basic (1) Memory (3)
Hi Contrast LCD Display

Reading Storage Capacity Storage of 2,500 datasets Storage of 100,000 datasets in up to 1,000 batches
Auto Log Mode automatically records environmental parameters at user selected time intervals. Runs unattended on batteries for up to 50 hours or continuously via USB
Enhanced Auto Log mode turns the gage off between readings for up to 8 months of battery life. Each reading can be uploaded to PosiSoft.net or an FTP server using WiFi. Automatically group readings into batches at daily, weekly, or monthly interval -
User defined limits for all parameters - visible and audible warnings. Send email alerts when connected to WiFi -
Onscreen Batch Annotation - add notes, change batch names and more with built-in QWERTY keyboard -
Store thickness, profile, environmental, hardness, salt contamination and wall thickness measurements in individual batches -
Wet bulb temperature can be displayed and recorded -
Trend charts graph readings in real-time -
WiFi technology wirelessly synchronizes with PosiSoft.net, downloads software updates and more -
Bluetooth® technology for data transfer to a mobile device running the PosiTector App or optional portable printer -
Mobile app connects PosiTector Advanced instruments to your iOS or Android smart device -

Step 2: Select from 4 DPM probes

Integral Probe (DPM)

  • Includes built-in air temperature/humidity sensor and thermocouple surface temperature sensor
DPM Probe
PT-DPM Screen with DPM Probe Attached

Integral Probe with Infrared Surface Temperature Sensor (DPMIR)

  • Measures and records environmental conditions including relative humidity, air temperature, surface temperature, dew point temperature, the difference between surface and dew point temperatures.
  • Non-contact surface temperature sensor
  • Measures hard to reach areas and moving parts
  • 4:1 Distance to spot ratio (D:S), optimized for measuring large surfaces
  • Pre-programmed and user adjustable emissivity options
PRBDPMIR - Integral Probe with Infrared Surface Temperature Sensor

Integral Probe with Cabled Surface Temperature Sensor (DPMS)

  • Includes built-in air temperature/humidity sensor and K-type connector
  • Magnetic surface temperature sensor with armored cable and locking device to prevent accidental disconnection from the instrument during unattended operation
  • Includes magnetic tab to attach the PosiTector body onto steel structures
  • Easily converts to accept other optional K-type thermocouple sensors including (a) hand-held surface temperature sensor, (b) self-adhering surface temperature sensor and (c) liquid temperature sensor.
    K-type Thermocouple Sensors
Probe DPMS

Integral Probe with Wind Speed Sensor (DPMA)

  • Includes the ambient temperature, surface temperature, and humidity sensors from PosiTector DPM Integral Probe plus a hot wire anemometer
  • Anemometer mode measures air temperature, relative humidity and wind speed
  • Auto-rotating display for inverted use
  • Wind Speed Range: 0-20 m/s, 0-44 mph, 0-65 ft/s, 0-3900 ft/m, 0-72 km/h, 0-38 knots
  • Wind Speed Accuracy: ± 3% Full Scale
Probe DPMA
PT-DPM Screen with DPMA Probe Attached
Anemometer mode shown includes wind speed (v)

Cabled Probe with 1/2" NPT Threads (DPMD)

  • Measures dew point, relative humidity and air temperature (shown)
  • Sintered aluminum housing protects sensors
  • Includes magnetic tab to attach the PosiTector body onto steel structures
  • ½" NPT threads for insertion into tanks and pipes (max 200 psi/ 1.3 MPa)
DPMD Probe
DPMD Probe Head
PT-DPM Screen with DPMD Probe Attached


Size159 x 61 x 31 mm (6.25" x 2.4" x 1.2")
Weight150 g (5.3 oz.) without batteries
Conforms ToISO 8502-4, BS 7079-B4, ASTM D3276, IMO PSPC, SSPC-PA7 and US Navy NSI 009-32
Warranty2 years

FAQ's (Frequently Asked Questions)

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.
Manufacturers offer the following optional k-type sensors:
-Hand-held Surface Temperature probe: for spot-checking difficult-to-access areas. -Self-adhering Surface Temperature Probe: sticks to solid materials including aluminum, wood, concrete, etc. Ideal for unattended monitoring applications. -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. Manufacturers recommend 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.

Specifications Range Accuracy Resolution
Surface Temperature –40° to 80° C ±0.5° C 0.1° C
80° to 190° C ±1.5° C
–40° to 175° F ±1° F 0.1° F
175° to 375° F ±3° F
Air Temperature –40° to 80° C ±0.5° C 0.1° C
–40° to 175° F ±1° F 0.1° F
Humidity 0 to 100% ±3% 0.1%
Wind Speed 0 to 20 m/s ±3% Full Scale 0.1 m/s
0 to 44 mph 0.1 mpg
Dew Point –60° to 80° C ±3° C* 0.1° C
–76° to 175° F ±5.4° F* 0.1° F
* dependent on RH. See Dew Point (Td) Accuracy for more information

Related Products

PosiTector DPM L Dew Point Meter Logger
Click image for more info
Positector® Dew Point Meter Logger

Complete Kit

The PT-DPM comes complete with humidity, temperature sensors, protective rubber holster with belt clip, wrist strap, 3 AAA batteries, instructions, nylon carrying case with shoulder strap (DPM/DPMA/DPMD), hard shell carrying case (DPMS),protective lens shield,Long Form Certificate of Calibration traceable to NIST, USB cable,two (2) year warranty.


Buy Now

Item Description Price
Environment Meter / Dew Point Meter, Standard Model with Separate Probe with 1/2" NPT Threads - DPMD1-G
PosiTector® DPM Built-In Probe (probe only display sold separately) PRBDPM
PosiTector® Cabled DPM Probe (probe only display sold separately) PRBDPMS
PosiTector® Integrated Probe with Infrared Surface Temperature Sensor (Probe only display sold separately) PRBDPMIR-C
PosiTector® DPMD Cabled Probe with 1/2" NPT Threads PRBDPMD
PosiTector® DPMA Built-in Probe with Anemometer PRBDPMA
PosiTector® Liquid Temperature K-type Thermocouple Sensor PRBDPMLTP
PosiTector® Hand-held Surface Temperature K-type Thermocouple Sensor PRBDPMHSP
Bluetooth Printer for PosiTector Series Gauges
10 Rolls of Paper for the Bluetooth Printer (PRINTERBT)
AC Power Adapter, 100-230V for PosiTector 6000 Display
Protective Lens Shields, Pack of 5 for PosiTector® 6000 Display
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