Measuring Environmental Conditions 6:35
In this video, learn how to monitor environmental conditions with the PosiTector DPM Dew Point Meter and the PosiTector DPM L Dew Point Meter Logger.
Professional Dew Point & Environmental Meter
Accurate Dew Point & Climate Monitoring for Coating Conditions
The PosiTector DPM is a professional handheld meter that measures all the key environmental parameters needed before painting or coating: air temperature, surface temperature, relative humidity, dew point, delta T, and even wind speed (optional probe).
Used globally across marine, industrial, infrastructure, and construction projects, the PosiTector DPM provides reliable data to prevent coating failures and ensure compliance with strict international standards.
Supplied in the UK by DFT Instruments, the official DeFelsko Authorised Service Centre, every PosiTector DPM comes UKAS/NIST traceable, fully calibrated, and supported with local expertise.
Features
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Bright 2.8″ Colour Display – Toughened, impact-resistant touchscreen with an updated keypad for fast, intuitive navigation.
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Built for the Field – Rugged IP65 housing offers protection against dust, water, and harsh site conditions.
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High-Performance Sensors – Precision, quick-response sensors deliver consistent and repeatable environmental readings.
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Automatic Data Logging – User-programmable logging function captures climate parameters at set intervals without manual input.
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Universal PosiTector Platform – Swap between probes easily, using one gage body for multiple inspection applications.
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Connected Reporting – Transfer results instantly via USB, Wi-Fi, or Bluetooth to PosiSoft software for PC, Mac, or mobile devices.
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Traceable Certification – Supplied with a long-form Calibration Certificate showing full traceability to recognised metrology standards (NIST/UKAS).
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Standards Compliance – Fully meets ISO 8502-4, BS 7079-B4, ASTM D3276, IMO PSPC, SSPC-PA7, US Navy NSI 009-32, and NAVSEA 009-32.
Why Measurement Matters
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Prevent Costly Failures
Condensation forms when surface temperature nears the dew point. If coatings are applied in this condition, adhesion suffers and early corrosion may occur. The PosiTector DPM eliminates guesswork by showing real-time Ts, Td, and ΔT values, with alerts when conditions are unsafe. -
Compliance with International Standards
Fully aligned with ISO 8502-4, ASTM D3276, SSPC-PA7, IMO PSPC, and US Navy NSI 009-32 requirements, the DPM ensures your inspection reports stand up to audit and client scrutiny. -
Monitor Environmental Trends
Arrow indicators show whether humidity, temperature, and dew point values are stable, rising, or falling — giving inspectors the ability to forecast unsafe conditions before they occur. -
Universal Applications
From ship maintenance and pipeline coating to bridge works, HVAC installations, and protective paint projects, accurate dew point measurement is critical in any environment where coatings must cure properly.
Why Choose DFT?
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Official UK Distributor – Genuine instruments with full DeFelsko warranty.
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Local Calibration & Service – Carried out in the UK to factory standards, with quick turnaround.
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Expert UK Support – Direct technical advice from our team on probe selection and best practices.
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Traceable Certification – Long-form Certificate of Calibration supplied with every unit.
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Trusted Partner Since 1998 – Over 25 years serving UK and Irish inspection professionals.
Helpful PosiTector DPM Videos
Remote Monitoring 6:36
Measuring environmental conditions and remote monitoring with the PosiTector DPM Dew Point Meter series from DeFelsko—the Measure of Quality.
Webinar 23:11
A webinar from DeFelsko featuring the PosiTector DPM Dew Point Meter. Recorded from the live stream of this webinar on March 15, 2018.
Features & Benefits
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All-in-One Display – Shows RH, air/surface temperature, dew point, and delta T simultaneously.
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Visual & Audible Alarms – Alerts when conditions approach unsafe limits (3 °C / 5 °F ΔT).
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Field-Proof Design – Rugged IP65-rated enclosure with rubber holster and tough keypad.
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Flip-Lock Screen – Rotates automatically for easy top or bottom viewing.
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Advanced Logging (Advanced Models) – Up to 100,000 readings with auto-log, trend graphs, batch notes, and Wi-Fi sync to PosiSoft Cloud.
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Connectivity – Export via USB, Bluetooth, or Wi-Fi into PosiSoft Desktop, App, or Cloud.
Comparison: DPM vs DPM L
| Feature | PosiTector DPM (Handheld) | PosiTector DPM L / L+ (Logger) |
|---|---|---|
| Application | Manual site checks | Long-term unattended monitoring |
| Measures | RH, air/surface temp, dew point, ΔT, wind speed | Same + wet bulb (Logger) |
| Data Storage | 2,500 (Std) / 100,000 (Adv) readings | Up to 10,000 datasets / 200-600 days |
| Alerts | Device display + audible/warning | Wi-Fi/email alerts (L+) |
| Connectivity | USB, Wi-Fi, Bluetooth | Bluetooth & Wi-Fi (L+) |
| Best For | Pre-application checks | Remote/coating application monitoring |
Comparison Table: PosiTector DPM Standard vs Advanced Models
| Feature | Standard Model | Advanced Model |
|---|---|---|
| Data Storage | 2,500 readings | 250,000 readings in up to 1,000 batches |
| Auto Log Mode | Logs continuously for up to 60 hours (battery) or via USB | Enhanced mode powers down between readings for up to 8 months battery life and supports auto-batch grouping |
| Connectivity | USB only | Adds Wi-Fi (for PosiSoft.net sync, email/FTP) and Bluetooth 4.0 |
| Alarms & Alerts | Fixed alert when surface temp is within 3 °C (5 °F) of dew point | Fully custom alerts for all parameters; can send email alerts via Wi-Fi |
| Display & Reporting | Basic numeric display | Trend charts, touchscreen batch editing, screenshot capture |
Probe Interchangeability
FAQ’s
What does the PosiTector DPM measure?
The instrument simultaneously records air temperature, surface temperature, relative humidity, dew point, and delta T (the difference between surface temperature and dew point). With optional probes, it can also measure wind speed and surface temperature using infrared.
Why is dew point measurement important before painting?
When surface temperature approaches the dew point, condensation can form, leading to poor adhesion and premature coating failure. Industry standards such as ISO 8502-4 require dew point checks before coatings are applied to steel and other critical substrates.
How is delta T (ΔT) used in practice?
ΔT is the margin between surface temperature and dew point. Most standards require a minimum 3 °C (5 °F) safety margin before painting. The PosiTector DPM automatically calculates this and displays warnings when conditions fall below the limit.
What standards does the DPM comply with?
It conforms to ISO 8502-4, ASTM D3276, SSPC-PA7, IMO PSPC, US Navy NSI 009-32, and NAVSEA 009-32. Using a DPM ensures inspections meet global compliance requirements.
What’s the difference between Standard and Advanced models?
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Standard models store 2,500 readings and connect via USB.
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Advanced models log up to 100,000 readings in 1,000 batches, with Wi-Fi and Bluetooth connectivity, email alerts, and detailed graphing.
Can the DPM log automatically?
Yes. In Auto Log mode, it records measurements at set intervals. Advanced models can log for months at a time, conserving battery life by powering down between readings.
Is it durable enough for outdoor worksites?
Yes. The meter is IP65-rated (dustproof, water resistant) with an impact-resistant case, protective holster, and scratch-resistant lens. It’s designed for marine, construction, and industrial sites.
How accurate are the readings?
The DPM uses fast-response precision sensors and is supplied with a long-form calibration certificate traceable to NIST/UKAS, ensuring accuracy across environmental conditions.
How often does it need recalibration?
We recommend annual recalibration to stay compliant with quality systems. As a UK Authorised Service Centre, DFT provides a one-day turnaround on recalibration and certification.
Can data be shared with colleagues or clients?
Yes. Data can be exported via USB, Wi-Fi, or Bluetooth into the free PosiSoft software (Desktop, App, or Cloud) to create customisable reports with graphs, notes, and logos.
Still need help?
If you experience an issue, check our troubleshooting guide or contact our support team directly. As a DeFelsko Authorised Service Centre (DASC), DFT Instruments provides calibration, repair, and technical assistance locally in the UK.
Find out more about the PosiTector DPM and all the features that come with it
What’s Included:
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PosiTector DPM body (Standard or Advanced)
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Environmental probe (integral or cabled)
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Protective holster, lens shield, wrist strap
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USB cable, batteries, carry case
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Long-form calibration certificate (traceable to UKAS/NIST)
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2 year warranty
Ensure your coatings are applied under safe, compliant conditions with the PosiTector DPM Dew Point Meter. Supplied by DFT Instruments with UK calibration, certification, and support.
📞 To enquire about this product, contact our team today on: 01442 879494 or Complete the form.