Portable dewpoint hygrometers

Our range of portable dewpoint hygrometers is suitable for a wide range of general and hazardous area applications for the measurement of trace moisture.

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How our portable dewpoint hygrometers work

Our portable dewpoint hygrometers are invaluable for measuring trace moisture in various applications. Suitable for rapid spot-check measurements of dewpoint or trace moisture content, they respond quickly to changes in trace moisture, whether measuring from dry to wet or wet to dry.

Designed for field use, our portable hygrometers are robust, lightweight, and easy to handle. They are suitable for industrial applications such as compressed air, natural gas, semiconductor manufacturing, power generation, and pharmaceuticals.

Each of our portable dewpoint hygrometers combines two main features to ensure a rapid response: the desiccant head assembly and the AutoCal span correction function.

The desiccant head assembly allows the dewpoint sensor to remain dry between tests by isolating the desiccant and sensor from atmospheric air. This rapidly brings all surfaces and voids into equilibrium, allowing operators to take multiple trace moisture measurements daily and achieve accurate, reliable results.

The AutoCal span correction allows the operator to easily make routine span checks of the dewpoint sensor and corrections to balance the sensor and the instrument, and correct for any deviation. This ensures optimal accuracy between laboratory calibrations, resulting in less downtime and immediate verification of the dewpoint system.

Alpha Moisture Systems’ range of DSP portable dewpoint hygrometers and our advanced generation of SADPmini2 handheld dewpoint hygrometers incorporate our ultra-high capacitance aluminium oxide sensing technology for precise measurement of trace moisture in process gases and compressed air, ensuring quick and efficient readings with minimum effort.

All our dewpoint instruments are suitable for safe-area use, and our intrinsically safe range is certified to ATEX, IECEx, and UL standards (SADPmini2-Ex) and ATEX standards (DSP-Ex) for use in hazardous areas. All portable hygrometers are supplied with a calibration certificate traceable to National and International Humidity Standards.

Key features of the range include:

Easy to use, reliable and efficient.

Ultra-high capacitance moisture sensing technology.

Guaranteed accuracy of ± 2 °C (± 3.6 °F) dewpoint traceable to National & International Humidity Standards.

Dewpoint ranges offered between -110 °C to +20 °C dewpoint.

Desiccant dry-down technology ensures the dewpoint sensor remains dry between tests for a quick response time.

AutoCal span correction function ensures optimum accuracy between laboratory calibrations.

Additional features include:

Both general-purpose and intrinsically safe models are available.

Choice of measurement units in °C or °F dewpoint and absolute values in ppm(v), ppm(w), mg/m³ or lb/MMSCF (depending on model).

Digital display with intuitive menu structure and choice of interface languages, making it easy to use, view and set user preferences.

Supplied with a calibration certificate traceable to National & International Humidity Standards.

Strong, durable, rugged construction

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Key Applications

Our portable dewpoint hygrometers are employed across a range of critical industries due to their speed and accuracy, making them perfect for moisture spot checks and ensuring the safety and efficiency of a variety of applications:

AerospacePortable dewpoint meters are crucial in the production of aeronautical parts requiring vacuum furnace heat treatment with very dry argon, and for verifying the dryness of welding shield gas at the torch head according to NADCAP standards.

Breathing AirIn diving, firefighting, and defence applications, portable dewpoint meters are used to test high-pressure cylinder breathing apparatus to prevent equipment freeze caused by excess moisture, which could have fatal consequences.

Food PackagingPortable dewpoint meters are employed to conduct rapid spot checks of trace moisture levels, helping extend the shelf life of foods by reducing waste and carbon footprint through the use of dry gas in packaging.

HDPE ProductionPortable dewpoint meters are used for spot-checking moisture in flammable gases like ethylene feedstock. They ensure safety and efficiency in the production of polyethylene to avoid decreased yields caused by excessive moisture.

Injection MouldingPortable dewpoint meters are used to verify the dryness of air circulating through plastic pellets, improving surface finish, colour, and opacity of products — increasing yields and reducing production costs.

Medical GasesEssential for ensuring the reliability and accuracy of moisture content in hospital air systems, portable dewpoint meters help conduct continuous monitoring and quarterly spot checks to prevent microbial growth and potential infection — meeting NHS HTM02 standards.

Natural Gas and LNGPortable dewpoint meters are vital for preventing freezing issues in pipelines and valves, and preserving gas calorific value by accurately measuring moisture during transit from extraction to storage.

Natural Gas TransferBy identifying moisture ingress in gas distribution networks, portable dewpoint meters ensure the reliability of domestic gas appliances by facilitating rapid problem identification and resolution.

PharmaceuticalsPortable dewpoint meters are crucial for spot checks on inert blanketing gases in medication and medical device production, preventing microbial growth and ensuring the dryness necessary for freeze-drying processes.

Power GenerationFor routine spot checks on hydrogen used in alternator cooling, portable dewpoint meters help maintain efficiency and safety by ensuring moisture is below critical levels to avoid condensation.

SF₆ Circuit BreakersPortable dewpoint meters help avoid excess moisture — a potential cause of arcing which decomposes SF₆ into corrosive products, taking the switch out of service and interrupting the power to the distribution network.

Speciality GasesPortable dewpoint meters facilitate accurate moisture measurements in calibration gases, minimising the valuable product expended during the test process and ensuring compliance with specifications.

Whatever the challenge, you can rely on Alpha Moisture Systems

If you require a customised trace moisture measurement solution, book a consultation with our expert technical team and find out how you can increase the efficiency and productivity of your operations.

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