Phymetrix Portable Moisture Analyzer Model: PPMa
The smallest, lightest, and most accurate dew point meter!

Multifunctional Multi-Purpose Cost Effective
Menu-driven, intuitive, easy-to-use
Handheld Dew Point Meter, Hygrometer

  • Fast, Accurate and Repeatable Handheld Dew Point Meter
  • Built-in temperature compensation
  • Continuous Status and Diagnostics display
  • On~screen histogram and trend graph
  • NEMA 4X for Outdoor use
  • Impact resistant IP65 enclosure, optionally ATEX approved
  • Magnet & Hook for difficult field connections
  • Integrated orifice provides pressure regulation
  • Optional Pressure Sensor with automatic dewpoint correction
  • USB data interface, also charges battery
  • -110°C to +20°C dewpoint Sensor
  • State-of-the-art electronics & software
  • Advanced User-friendly Interface
  • Small & Lightweight
  • Graphical display
  • Programmable data logging
  • Battery backed clock calendar
  • 1/8″ Swagelok® compression fittings
  • 316 Stainless Steel & PTFE wetted parts
  • Built-in Sensor desiccant store for rapid results
  • Optional 4/20 mA output
  • NIST calibrations
  • Virtual Analyzer PC training & demo software
Moisture Sensor
  • Range: -110°C to +20°C dewpoint ( -166°F to +68°F dewpoint )
  • Accuracy: ±2°C temperature corrected
  • Repeatability: 0.8°C
  • Response time: 95% of step change in 3 min.
  • Sample flow: >1 LPM
Temperature Sensor
  • Range:  -40°C to +70°C
  • Accuracy:  ±2°C
Pressure Sensor
  • 2 to 150 PSIA  ±1%, 316L stainless steel wetted parts; higher pressures can be ordered optionally
  • Comfortable to hold in hand, contoured body design, lightweight 1.75 Lbs
  • Hook and magnet for easy temporary field securing / mounting
  • Easy to read graphic LCD display with user controlled backlight brightness (LCD is readable without the backlight)
  • Snap dome tactile membrane switches with dynamically assigned legends
  • Audible feedback upon button press as well as for warnings and alarms
  • Auto scaling graph / histogram on moisture measurement display for stability verification
  • Easy to use with verbose built-in context sensitive Help screens
  • Battery Saver, with user selectable Auto-power-down times, can also be disabled
  • Built-in pressure measurement and pressure corrected moisture readings, simultaneously displayed with the uncorrected reading for
  • greater ease of understanding
  • Verbose Status bar with indications,  warnings and audible errors
  • User selectable locking with or without a password.
  • Built-in battery backed clock calendar
  • External AC Universal Power adapter (100-240VAC 50-60Hz) with USB connector
  • Rechargeable Li-Ion battery, recharges through the USB connector from the PC or from the supplied universal power adapter
  • Sampling system and sensor are isolated from electrical interface and supply grounds
  • Measurement resolution of moisture sensor: 1pF resulting in less than 0.01°C
  • External power and I/O: USB mini B female connector – IP67 / IP68  with Sealing Cap
  • 1/8″ Swagelok® Inlet and Outlet fitting adapters for the SAE/MS 5/16-24 ports.
  • Inlet adapter has a built-in flow control orifice, eliminating  pressure regulators while maintaining sufficient but not excessive flows.
  • All 316 Stainless Steel and PTFE wetted parts, small surface area stainless steel sampling chamber for fast response time.
  • Integral Sensor retraction into desiccant storage chamber for fast response-time when measuring low moisture
  • Enclosure
    • Impact resistant (>7 Nm to EN 50014) Polyamide 12,
    • IP65/EN 60529 ATEX hazardous area use (Ex II 2 G) approved (PTB 02 ATEX 1076U),
    • Flammability: UL 94 HB
    • Abrasion resistant Polycarbonate display lens
    • Dimensions- L:  7.36″ (187mm) W:  4.17″ (106mm) H:  1.97″ (50mm)
  • Weight Total:  1.75 Lbs (0.8 Kg)
  • Pressure: 150 PSIA (10.3 Bar) — Available with High Pressure Option 500 PSIA (34.5 Bar)
Temperature Range
  • PPMa Analyzer: -20°C to +60°C
  • Electronics: -40°C to +85°C
  • Moisture Sensor: -20°C to +60°C
  • Pressure Sensor: -20°C to +85°C
  • LCD operating: -20°C to +70°C storage: -30°C to +80°C
  • Enclosure: -40°C to +60°C
Miscellaneous Features
  • NIST traceable calibrations
  • Units of measure: °C & °F dewpoint, ppmV, ppmW, µB H2O vapor pressure, grams of H2O / m3,
    Lbs H2O /106 standard cubic feet in Natural Gas. (All units auto-scaled)
  • Digital & Analog I/O:  USB, 4/20mA with HART®
  • Data logging – single point, multipoint, time stamping, each sample records: dewpoint, temperature and pressure,  ( memory > 4,000 samples)
  • Virtual Analyzer PC software for training and evaluation,
  • allows the user to experience the exact interface on their own PC with voice explanations
handheld dew point meter
hygrometer PPMa
handheld dew point meter

Phymetrix portable moisture analyzer model PPMa shown in use at a natural gas cryogenic fractionator. The PPMa is hooked up after the mole sieve dryer after the methanol injection, just before the fractionating cryogenic separator. The PPMa is setup to log overnight the moisture content of the gas in order to evaluate the capacity and column switching times of the mole sieve dryer. Keeping the moisture content low has many benefits including a lessening need for thawing out the cryogenic separator to remove the accumulated ice.
The ability of the PPMa to operate in a wide temperature range and its impact resistant IP 65 weatherproof housing allows it to be used even in the toughest environments such as this Colorado winter snow storm overnight logging. The sensing technology’s insensitivity to methanol is also a unique and important factor in this measurement.
The data shows that the mole sieve dryer is undersized and the columns are not switched often enough. The breakthrough of moisture that occurs about 6 or 7 hours into the cycle adds undesirable quantities of moisture. It shows engineers that they need to switch the columns more often and regenerate the mole sieve better by increasing regeneration cycle temperature and/or flow.
No other portable analyzer can be used in this kind of rough environment. However the PPMa not only operates but makes accurate and fast measurements that other analyzers can not perform. Most other analyzers experience interference from the methanol being injected into the gas stream.


hygrometer PPMa


  • Exhaust Pigtail
  • USB Cable
  • Universal AC Charger
  • Plug set for international shipments

Not Shown But Included

  • 1/8″ Teflon Tube, 6′ long, up to 250 psi
  • User’s Manual
  • NIST Certificate


PhyMetrix Portable Moisture analyzer Model:PPMa
Included Accessories: USB cable (mini B male to A male), AC universal power adapter with USB connector, two (2) 1/8″ tube to SAE/MS 5/16-24 Swagelok® adapters (flow control orifice built into one of the SAE adapters), Exhaust pigtail, Sampling Tube 6 feet of 1/8″ dia. Teflon, Hanging hook and magnet
Pressure Sensor Option 0-150 PSIA W/ Automatic Pressure Correction suffix -P
High Pressure Option upto 500 PSIA (34.5 Bar) suffix -H
Analog Output 4/20 mA with HART® Option suffix -A
Intrinsically Safe ATEX Option suffix -I