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DSP-Ex | Portable Dewpoint Hygrometer
A self-contained, portable hygrometer designed to deliver precise trace moisture measurements of gases and dry compressed air, certified intrinsically safe for hazardous applications.
Certified intrinsically safe to ATEX standards (ATEX Ex ia IIC T3/T4 Ga) and CE approved, the Model DSP-Ex is suitable for use in hazardous areas. With an accuracy of ±2 °C dewpoint and an overall range of -110 °C to +20 °C dewpoint, the DSP-Ex ensures reliable performance. The hygrometer’s unique desiccant dry-down technology provides rapid response times, making it ready for spot-check readings with minimal air or gas usage. The advanced dewSMART transmitter, utilizing ultra-high capacitance aluminum oxide sensing technology, guarantees unsurpassed repeatability and measurement precision — and is fully interchangeable without returning to Alpha Moisture Systems for calibration and setup.
The DSP-Ex features a user-friendly interface and requires little to no maintenance. The digital screen offers versatile display options, allowing users to select from various moisture units, including °C, °F, ppb(v), ppm(v), ppm(w), g/m³, and lb/MMSCF. Additionally, the device includes a user-programmable parts per million (weight) function for specific gases, with pre-programmed settings for common gases like Air, Ar, H₂, SF₆, CO₂, and N₂.
Powered by six “C” type batteries, the DSP-Ex performs self-diagnostics on startup and includes an automatic switch-off function to conserve battery life, providing over 250 hours of continuous operation. The standard package comes ready to use with batteries installed, two meters of stainless-steel PTFE sampling hose, stainless-steel quick-connect fittings, a calibration certificate, an instruction manual, and an anti-static carrying case, ensuring you have everything needed for immediate use.
Whatever the challenge — Alpha Moisture Systems has you covered.
- Highly customised solutions
- Trusted by industry leaders
- Distributors worldwide
- Over 30 years experience
Accurate dewpoint measurement in hazardous areas
Key features
- Intrinsically safe — certified to ATEX standards for use in hazardous areas
- Unsurpassed sensitivity, speed of response, repeatability, stability and long service life
- Dewpoint ranges offered between -110 °C to 20 °C, with accuracy of ±2 °C dewpoint traceable to National & International Humidity Standards
- Digital display shows engineering units in your selected measurement unit
- Choose from various measurement units in °C or °F dewpoint and absolute values in ppb(v), ppm(v) ppm(w) g/m³ and lb/MMSCF
- Six “C” type batteries offer more than 250 hours of use in continuous operation
- Intuitive menu structure making it easy to use, view and set user preferences
- Strong, durable and rugged construction
Technical Data
General | |
| Sensor/Transmitter Type | Sensor |
| User Interface | English |
| Factory Calibration | Supplied with a calibration certificate traceable to National and International Humidity standards |
| Accessories | 2m stainless steel braided PTFE hose, 1/4" NPT tapered fitting, female quick connector, pressure calculator, screwdriver |
| Documentation | Instruction manual, calibration certificate |
Sensor | |
| Sensing Element | Ultra-high capacitance aluminium oxide |
| Dewpoint Range | Dewpoint sensor overall range offered between -110 °C to +20 °C (-166 °F to +68 °F) dewpoint -110 °C to -20 °C (-166 °F to -4 °F) dewpoint -100 °C to 0 °C (-148 °F to +32 °F) dewpoint -80 °C to +20 °C (-112 °F to +68 °F) dewpoint |
| Certification | ATEX |
| Approvals | CE |
| Accuracy | ± 2 °C (±0.36 °F) dewpoint |
| Sensor Calibration | Supplied with a calibration certificate traceable to National and International Humidity standards |
| Repeatability | Better than ±0.3 °C dewpoint |
| Temperature Coefficient | Temperature compensated for operating range |
| Sample Flow Rate | Flow independent, ideally 5 - 10 L/min. Max 20 L/min |
| Response Times | Dry to wet: -100 °C to -20 °C (-148 °F to -4 °F) - Instantaneous; in less than 5 seconds Wet to dry: 0 °C to -60 °C (14 °F to -76 °F) - less than 120 seconds |
| Calibration Warranty | 12 months from date of dispatch |
Electrical | |
| Electromagnetic Compatibility (EMC) | Immunity: Complies with EN 61000-6-1:2007 Emissions: Complies with EN61000-6-3:2007 |
| Display | 2 x 20 character LCD with programmable contrast |
| Power Supply | 9V DC , six C type disposable batteries |
| Battery Life | Excess of 250 hours |
| Resolution | Display - 0.1 C dewpoint/0.1ppm |
| Repeatability | ± 0.1 °C dewpoint |
| Warm Up Time | 15 seconds |
| Engineering Units | °C, °F, ppm(V), ppm(w), ppb(v) g/m³, lb/MMSCF |
| Fault Conditions | Self diagnostics |
Mechanical | |
| Dimensions in mm (H x W x D) | 153 x 310 x 365 |
| Weight | 5.8kg |
| Operating Pressure | Atmospheric to 0.5 barg |
| Operating Humidity (External) | 0-98% RH, non condensing |
| Operating Temperature | -20 C to +50 °C |
| Storage Temperature | -20 °C to +50 °C Maximum 95% Non-Condensing |
| Cable | Stainless steel braided PTFE sampling hose |
| Sensor Protection | 316 sintered stainless steel filter - 50 micron |
| Fittings | Swagelok quick connect, 0.25" diameter compression tube fitting |
| Mechanical Warranty | 12 months in case of defective parts or faulty workmanship |
Downloads
What's in the box
Model DSP-EX Portable Dewpoint Hygrometer
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 and BeverageMoisture control is critical in the food and beverage industry to prevent food quality loss. Packaging foods in an atmosphere of dry gases like Nitrogen and carbon dioxide extends shelf life. Our AMT and AMT-Ex transmitters enable continuous trace moisture measurement, reducing waste and carbon footprint.
HDPE ProductionUtilised for spot-checking moisture in flammable gases like ethylene feedstock, portable dewpoint meters 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.
Frequently Asked QuestionsIf you have a question that’s not answered below, please contact us
Can you sample gas or air in hazardous areas/zones with the DSP-EX?
Yes. The DSP-Ex is certified intrinsically safe for hazardous areas but can also be used in non-hazardous applications. Please refer to the datasheet for more information.
What dewpoint ranges and units are available for the DSP-Ex?
What is the response time of the DSP-Ex sensor?
How do I connect the DSP-Ex to my sample point?
At what pressure can the DSP-Ex operate?
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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.
Dewpoint Calculator for Trace Moisture Measurement
in Gases & Compressed Air