DeFelsko PosiTector DPM1 Dew Point Meter
In the industrial coating and steel structure surface preparation industry, controlling environmental climatic conditions is a mandatory step prior to application. If the air humidity is excessively high or the surface temperature is too close to the dew point, water vapor will condense to form an ultra-thin moisture film, causing severe defects such as flash rusting, blistering, or delamination of the paint film. The DeFelsko PosiTector DPM1 dew point meter is a next-generation digital climatic instrument, delivering a rapid, precise environmental monitoring solution with the most optimized investment cost.
Overview of DeFelsko PosiTector DPM1

- PosiTector Standard Gage Body: Features a sharp color display screen with a minimalist interface, focusing on rapidly displaying basic statistical parameters, making it extremely effortless to operate.
- Standard DPM Probe: Integrates highly sensitive sensors to measure and calculate 5 core climatic parameters simultaneously in a single click operation, including: Relative Humidity (RH), Air Temperature (Ta), Surface Temperature (Ts), Dew Point Temperature (Td), and the delta between surface and dew point temperatures (Ts – Td).
The equipment fully complies with stringent international standards such as ISO 8502-4, ASTM D3276, and U.S. Navy NSI 009-32.
Key Features of DeFelsko PosiTector DPM1
💡 Simultaneous Measurement and Intuitive Display of 5 Core Parameters
Instead of carrying multiple bulky mechanical thermometers and hygrometers, the PosiTector DPM1 automatically and continuously updates all climatic parameters on the screen. The gage automatically calculates the safe margin between surface temperature and dew point (Ts – Td), helping QC technicians instantly assess whether the current environment satisfies safe conditions for abrasive blasting or coating application.
💡 User-Friendly Standard Gage Body with Basic Statistical Displays
Unlike the Advanced tier oriented toward complex graphical data logging, the Standard version of the DPM1 optimizes the user experience toward stream-lined efficiency:
- Sharp Color Screen: Integrates an auto-rotating display feature, enabling engineers to easily read parameters from any difficult-to-reach viewing angle.
- 1,000-Reading Storage Memory: Completely sufficient for a long day of direct field acceptance auditing.
- Real-Time Statistics: Continuously calculates and displays the Maximum (Max), Minimum (Min), Average, and Standard Deviation of readings directly on the screen.
💡 Shock-Absorbing Rubber Holster Design with Outstanding Weather Resistance
The gage body is robustly engineered with a premium shock-absorbing, scratch-resistant rubber holster. The device conforms to the IP65 protection standard, providing exceptional resistance to water and dust entry, which ensures durable and stable performance in harsh environments such as machine shops, offshore rigs, or windy and dusty job sites.
💡 Effortless Computer Connectivity and Data Management
The PosiTector DPM1 comes equipped with a built-in USB port. Users can seamlessly connect the instrument to a computer to transfer and store data via the manufacturer’s free PosiSoft software, making project quality record management or report printing for investors more professional than ever.
Technical Specifications:
Below are the detailed technical specifications and kit components of a standard PosiTector DPM1 dew point meter package.
| Parameters | Measurement Range | Accuracy | Resolution |
| Surface Temperature (Ts) | -40°C ∼ 80ºC | ±0.5°C | 0.1°C |
| 80°C ∼ 190ºC | ±1.5°C | ||
| Air Temperature (Ta) | -40°C ∼ 80ºC | ±0.5°C | 0.1°C |
| Relative Humidity (RH) | 0 ∼ 100% | ±3% | 0.1% |
A complete PosiTector DPM1 product package includes the following components:
- PosiTector Standard gage body.
- Separate DPM cabled probe.
- Shock-absorbing protective rubber holster.
- AAA batteries (3 units).
- Convenient carrying pouch, wrist strap.
- USB cable, instruction manual, and calibration certificate.
Practical Applications of DeFelsko PosiTector DPM1
Thanks to its high cost-efficiency, fast measuring speeds, and absolute data reliability, the PosiTector DPM1 is widely implemented in:
- Steel Structure & Pipeline Inspection: Auditing weather conditions prior to sandblasting rust removal and anti-corrosive priming for chemical tanks, structural steel frames, and bridges.
- Shipbuilding & Marine Industry: Controlling relative humidity and dew point temperatures inside ship voids and hull surfaces, ensuring ideal conditions for high wear-resistant coating systems to bond securely.
- Industrial Workshop Epoxy Floor Installation: Evaluating air humidity and concrete slab temperatures to optimally prepare for primer applications, completely preventing delamination caused by trapped underlying moisture condensation.
- Facility Maintenance & Paint Curing Rooms: Monitoring paint drying environment conditions to ensure the coating layer dries uniformly, with a smooth, glossy finish free of surface defects.
Basic Instrument Operating Instructions
Compared to common measuring instruments such as multimeters, clamp meters, precision mechanical gages, and many other devices, the PosiTector DPM1 is far simpler to operate. Below is a detailed step-by-step user guide:
Step 1: Install the batteries into the gage according to their correct polarity.
Step 2: Press and hold the power button to turn on the instrument, readying it for measurements.
Step 3: Setup the measurement units (°C or °F) and configure additional features within the menu bar.
Step 4: Perform the temperature and dew point measurements sequentially:
- Ambient Measurement (Ta, %RH, Td): Place the device in the target environment for a few minutes to allow the sensors to stabilize with the surrounding conditions.
- Surface Temperature Measurement (Ts): Place the probe directly and perpendicularly against the target surface; the Ts and Ts-Td values will then be automatically calculated and displayed on the screen.
Step 5: Save the measured data (if required) by selecting the Memory function in the Menu to log the current readings into the internal memory.
Step 6: Press and hold the power button to turn off the instrument after completing operations.
Outstanding Advantages of the Product

The PosiTector DPM1 features a durable, robust design with components manufactured and engineered meticulously to ensure toughness and high resilience under harsh environmental exposures. The main gage body is constructed from premium plastic materials on advanced, modern production lines, satisfying international IP standards for quality and reliability. The accompanying rubber holster also plays a vital role in effectively reinforcing the instrument’s protection.
Beyond these core advantages, the PosiTector DPM1 dew point meter is widely favored due to the following characteristics:
- Intuitive user interface, large color display, and clear buttons.
- Versatile functionalities with a flexible, interchangeable probe architecture to meet distinct measurement requirements.
- A variety of convenient auxiliary features, such as large data storage capacity, efficient data management, and simple, professional report generation and analysis.
- Complies with international ISO standards.
- Rapid, precise, and convenient field/home self-calibration capabilities.
- Long operational lifespan and highly stable performance.









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