PORTABLE DEW POINT METERS PRODUCT DATASHEET Model XPDM™ Portable dew point meter for fast and precise spot checks of moisture • Spot checking • Harmonizing and verifying • Electrical insulating gases • SF6 moisture measurement • Natural gas pipelines • Cryogenic gas producers • Specialty gas producers • Welding and joining

Overview The portable dew point meter Model XPDM is a battery operated, hand-held instrument, designed for applications where quick and accurate dew point measurements have to be made. With the XPDM, accurate spot-checks of moisture in gases can be made faster and easier than ever, over the range of -148°F to +68°F (-100°C to +20°C) dew point. Applications Important uses of the XPDM include: petrochemical, feedstock gases, instrument air, transformer and switch gear insulating gases, gas cylinders and air separation plants, welding gases, shipboard LNG and aviation oxygen, transfer standard,...

Sample Cell Design All surfaces in contact with the sample are made from 316 stainless steel and are electropolished to assure rapid equilibrium with the sample. Sensor and piston slide through spring-loaded PTFE seals protecting the sample cell as well as the desiccant cartridge from intrusion of wet air or gas. The sample cell can measure gas flows of up to 20 liters per minute. The flow rate has no effect on the measurement. The pressure in the sample cell is near atmospheric and should not exceed 2 bar (29 psi). The instrument computer gives a read out at sensor pressure as well as at any...

Hyper-Thin-Film (HTF) Al2O3 Moisture Sensor Technology The HTF™ aluminum oxide sensor installed in the model XPDM is the product of years of intensive research at the laboratories. It offers significant performance advantages over all other aluminum oxide moisture sensors. The operating principle is similar to that of other aluminum oxide sensors: a hygroscopic layer of aluminum oxide adsorbs or releases water molecules within its pores, depending on the water vapor pressure in its environment. Thus, the electrical capacitance of the aluminum oxide layer changes with the surrounding water vapor...

High Capacitance Response Due to the HTF Hyper-Thin-Film and a special pore geometry, sensors have a capacitance change over their full range, several orders of magnitude larger than that of conventional aluminum oxide sensors. Additionally, this change is quasi-linear and its sensitivity to temperature is negligible. The advantages of a linear high capacitance response are: better sensitivity, better repeatability and faster response times. Also, the measurement system is less prone to noise and drift, and signal conditioning is kept to a minimum. Hyper Thin Film vs. Conventional AI2O3 Sensor....

TECHNICAL SPECIFICATIONS Dew Point Sensor Element: Type Hyper Thin Film high capacitance Al2O3 Dewpoint range Response time F or a step change from -40°C to -60°C: 63% in 90 seconds; 90% in 450 seconds Temperature Range: Sensor Storage temperature Sample flow range Static to 100 m/s (linear velocity @1atm) Calibration method T his field calibration procedure is fully automated and the user is prompted though a simple one minute procedure, which requires no additional equipment. NIST traceable factory calibration optionally available. Temperature Range: The sample temperature is measured with...

Features: Sensor storage When not in use the sensor is retracted in a molecular sieve container and kept at an approximate dew point of -80°C. The sample gas pressure activates a piston which automatically moves the sensor into the sampling chamber, thus even low dew points can be measured extremely quickly. Area classification A pproved for use in hazardous (classified) areas Class I, Div. 1, Groups A, B, C & D. Available as an option. Input resolution L CD with back-light, 3.5 digits and custom legends for units and mode, audio alert. Engineering units 5 push buttons, all settings stored in...

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