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Key: test item, instrument name, total nonvolatile migration, gravimeter, moisture permeameter

Product

Portable Professional Dew Point Meter

DPM-16H
Focusing on packaging and material testing technology, we are committed to quality control in industries such as healthcare, pharmaceuticals, food, packaging, textiles, and new materials. Our products are widely used in enterprises, testing institutions, universities, and research institutes.

Category:

Hygrometr, Moisture and Dew Point

Dew point meter

Electrolytic Moisture & Dew Point Meter - Portable Trace Water Analyzer

Functions

Measure trace moisture content and dew point in non-corrosive, acidic, and slightly corrosive gases.

Quantify water vapor concentrations from 0.5 ppmv to 3800 ppmv with 10 ppb resolution.

Determine dew point temperatures from −80 °C Td to −6 °C Td.

Essential for specialty gas production, semiconductor manufacturing, petrochemical processing, and laboratory research.

Working Principle

The instrument employs the electrolytic method using a phosphorus pentoxide (P₂O₅) sensor. A coil‑like double platinum wire with a gap of less than 20 µm constitutes the electrolytic cell. P₂O₅ in the gap acts as a strong desiccant, absorbing trace water from the gas stream to form phosphoric acid. When a voltage is applied across the platinum wires, the phosphoric acid undergoes electrolysis, generating a weak DC current. This current is directly proportional to the mass of water absorbed per unit time. The embedded microprocessor converts the measured current into moisture content (ppmv) and dew point temperature (°C Td), displaying both values in real time.

Compliant Standards

ASTM E203‑16 - Standard Test Method for Water Using Volumetric Karl Fischer Titration(fundamental moisture analysis reference)

ISO 10101‑1:1993 - Natural gas - Determination of water content - Part 1: Electrolytic method(equivalent methodology)

ISO 8573‑3:2019 - Compressed air - Part 3: Test methods for measurement of dew point(dew point reference)

GB/T 5832.1‑2011 - Determination of trace moisture in gases - Part 1: Electrolytic method

Key Features

Ultra‑High Sensitivity: Detects moisture as low as 10 ppb (0.01 ppm), with a measurement range of 0.5 ppmv to 3800 ppmv and accuracy of 0.5 ppmv or 1 % of measured value.

Wide Dew Point Range: Covers −80 °C Td to −6 °C Td, suitable for both ultra‑dry gases and moderately humid streams.

Acid Gas Resistance: The P₂O₅ sensor and flow path materials are engineered to withstand acidic and slightly corrosive gases, expanding applicability beyond standard moisture analyzers.

Portable & Battery‑Powered: Built‑in high‑performance rechargeable battery provides over 12 hours of continuous operation on a single 4‑hour charge. Compact dimensions (230 × 90 × 142 mm) enable field use.

Direct Measurement: Connect the gas line directly - no bypass flushing required. Reduces setup time and gas waste.

Sensor Over‑Range Protection: Automatic safety circuit prevents sensor damage if gas pressure or moisture exceeds safe limits, extending sensor life.

Fast Response: Achieves stable readings in less than 5 minutes after gas connection.

Repeatable Results: Repeatability ≤ ±1 °C Td ensures consistent, reliable data for quality decisions.

Technical Specifications

Name	Parameter	Name	Parameter
Dew point Range	-80 ℃Td ~ -6 ℃Td	Repeatability	≤±1 ℃Td
Water content range	0.5 ppmv ~ 3800 ppmv	Water content error	0.5 ppmv or 1% m.v
Flow rate	100 sccm	Response time	＜5 min
Charging time	4 hour	Battery capacity	One charge for 12 hours
Gas pressure	0.1 MPa	Size	23090142 mm（LBH）
Environment	-10 ℃~45 ℃

Application Industries & Scenarios

Specialty Gas & Electronics

Semiconductor Manufacturing: Monitor moisture in ultra‑high‑purity (UHP) nitrogen, argon, and hydrogen to prevent wafer oxidation.

LED & Solar Cell Production: Ensure dry inert gas environments for thin‑film deposition processes.

Specialty Gas Suppliers: Certify moisture content in delivered gas cylinders per customer specifications.

Petrochemical & Natural Gas

Natural Gas Processing: Measure water content to prevent hydrate formation and pipeline corrosion (ISO 10101‑1 method).

Refinery Hydrogen Streams: Monitor moisture in hydrogen recycle gas for catalyst protection.

LPG & LNG: Verify dryness of liquefied petroleum and natural gas streams.

Chemical & Pharmaceutical

Acid Gas Analysis: Measure trace moisture in HCl, SO₂, and other acidic gas streams that would damage standard capacitive sensors.

Polymer Production: Control moisture in monomer feedstocks to prevent unwanted side reactions.

Pharmaceutical API Synthesis: Ensure dry inert gas blankets during moisture‑sensitive reactions.

Compressed Air & Gas Distribution

Compressed Air Quality: Test dew point per ISO 8573‑3 for breathing air, instrument air, and process air systems.

Gas Pipeline Commissioning: Verify dryness of newly installed gas distribution lines before service.

Research & Laboratory

Catalyst Research: Correlate moisture levels with catalyst activity and lifetime.

Material Science: Study moisture adsorption/desorption on novel porous materials.

Calibration Laboratories: Use as a transfer standard for moisture analyzer verification.

Frequently Asked Questions (FAQ)

Q1: What is the electrolytic method and why is it suitable for trace moisture?

A: The electrolytic method uses phosphorus pentoxide (P₂O₅), one of the strongest known desiccants. It chemically binds water molecules and then electrolyzes the resulting phosphoric acid, producing a current directly proportional to the water mass flow. This provides absolute, calibration‑free measurement with extremely high sensitivity (down to 10 ppb), making it ideal for trace moisture in gases.

Q2: Can this instrument measure corrosive or acidic gases?

A: Yes. Unlike many moisture analyzers that are limited to clean, dry air or inert gases, this meter is specifically designed to handle acidic and slightly corrosive gases thanks to its chemically resistant P₂O₅ sensor and compatible flow path materials. This makes it unique for petrochemical and specialty chemical applications.

Q3: What is the difference between dew point and moisture content (ppmv)?

A: Moisture content (ppmv) is the ratio of water vapor volume to dry gas volume (parts per million by volume). Dew point (°C Td) is the temperature at which water vapor begins to condense into liquid at a given pressure. Both describe the same physical state; the instrument displays both for user convenience. Conversion depends on gas composition and pressure.

Q4: How often does the sensor need to be replaced?

A: The P₂O₅ sensor has a finite capacity and will eventually saturate. Typical lifespan depends on usage frequency and moisture levels encountered. Under normal operation with dry gases, the sensor can last 6–12 months. The instrument alerts the user when sensor performance degrades. Replacement is straightforward and can be done in the field.

Q5: Is bypass flushing required before measurement?

A: No. The instrument is designed for direct measurement upon gas connection. This eliminates the need for a separate bypass purge line, simplifies setup, and reduces gas consumption.

Q6: What gas pressure is required?

A: The recommended gas pressure is 0.1 MPa (1 bar). Ensure the supply pressure does not exceed this value to protect the sensor and flow control components. An over‑range protection circuit provides additional safety.

Q7: How does the battery‑powered operation benefit field use?

A: With 12 hours of continuous operation on a single charge and a compact, lightweight design (230 × 90 × 142 mm), the meter is fully portable. It can be carried to remote sampling points, used in areas without power outlets, or deployed for on‑site verification of gas quality.

Function：
The meter uses the electrolytic method to measure the moisture content or dew point of non-corrosive gas or acid gas.
Principle:
The coil-like double platinum wire and its gap (less than 20um) constitute an electrolytic cell. Phosphorus pentoxide in the gap between platinum wires absorbs trace water to produce phosphoric acid and generates a weak current. The current is proportional to the amount of water absorbed. The dew point or trace water content is calculated according to the measured current.
Standards：GBT 5832.1.
Characteristics：
- High precision, 10 ppb.
- Wide Test range, -80℃Td~-6 ℃Td.
- Corrosion resistance - It can measure acid gas and slightly corrosive gas.
- High-performance rechargeable battery - over 12 hours of continuous operation.
- Easy to use - direct measurement with gas connection, without bypass flushing.
- Sensor safety - with a sensor over range protection function.

Specification：

Name	Parameter	Name	Parameter
Dew point Range	-80 ℃Td ~ -6 ℃Td	Repeatability	≤±1 ℃Td
Water content range	0.5 ppmv ~ 3800 ppmv	Water content error	0.5 ppmv or 1% m.v
Flow rate	100 sccm	Response time	＜5 min
Charging time	4 hour	Battery capacity	One charge for 12 hours
Gas pressure	0.1 MPa	Size	23090142 mm（LBH）
Environment	-10 ℃~45 ℃

Keywords:

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Real-time Online Dew Point Meter