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HygroPro Moisture Transmitter

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The HygroPro is a loop-powered, intrinsically safe moisture transmitter for measuring the moisture content in gases and non-aqueous liquids in pipeline natural gas, petrochemical, power generation, pharmaceutical, process, and industrial applications. The HygroPro features an aluminum oxide moisture sensor, temperature thermistor, and pressure transducer built on a single probe mount to provide real time measurements for the calculation of parameters such as ppmv in gases, pounds per million standard cubic feet in natural gas, ppmw in liquids and percent relative humidity in addition to dew point temperature.

The HygroPro consists of the replaceable transducer element containing the moisture, temperature, and pressure sensors along with a display and six-button keypad for full programming of the display and analog (4-20mA) and digital (RS485) outputs. The intrinsically safe certified electronics housed in a Type 4X/IP67 enclosure allow the HygroPro to be installed directly in the hazardous location. All calibration data for the moisture and pressure sensors is stored on the replaceable transducer element eliminating the need for manual data entry when changing the element.

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Features

  • Ambient to ppb moisture measurement
  • Three-function capability with aluminum oxide moisture sensor, temperature thermistor and pressure transducer
  • Display can be oriented in field for easy viewing
  • Calibrations traceable to National Institute of Standards and Technology (NIST)
  • Requires only twisted pair cabling
  • Complete program capability via six-button keypad
  • Integrated display/user interface
  • Analog and digital outputs

 

Applications

HygroPro is suitable for a variety of applications, including:

  • Pipeline natural gas
  • Petrochemical
  • Power generation, pharmaceutical
  • Process
  • Industrial applications

Specifications

HygroPro Specifications

Dew Point/Frost Point Calibration Ranges
  • Overall: 68°F to -166°F (20°C to -110°C)
  • Standard: 68°F to -112°F (20°C to –80°C)
Operating Temperature
  • Overall: 68°F to -166°F (20°C to -110°C)
  • Standard: 68°F to -112°F (20°C to –80°C)
Operating Temperature –4°F to 140°F (–20°C to 60°C)
Warm-Up Time Meets specified accuracy in three minutes
Calibrated Accuracy @ 77°F (25°C)
  • ±3.6°F (±2°C) from -85°F to 50°F (–65°C to 10°C) dew/frost point
  • ±5.4°F (±3°C) from –112°F to –86°F (–80°C to –66°C) dew/frost point
Repeatability
  • ±0.9°F (±0.5°C) from –85°F to 50°F (–65°C to 10°C)dew/frost point
  • ±1.8°F (±1.0°C) from –112°F to –86°F (–80°C to –66°C)frost point
Response Time Less than five seconds for 63% of a step change in moisture content in either wet-up or dry-down cycle

Electrical

Power
  • 12 to 30 VDC (loop-powered, customer supplied)
  • Output: 4 to 20 mA analog, RS485 digital
  • Output Resolution: 0.01 mA/12 bits
  • Max R = (PSV x 33.33) - 300 Example: (24 x 33.33) - 300 = 500 S
  • Cable: 6 ft (2 m), standard (consult factory for custom lengths); cable includes molded weatherproof connector with flying leads
Display
  • 128 x 64 LED backlit LCD
  • Display from one to three parameters and diagnostics

Mechanical

Sample Connection
  • 3/4-16 in (19 mm) straight male thread with O-ring
  • G 1/2 with optional adaptor
Operating Pressure 5 :Hg to 5000 psig (345 bar)
Enclosure Type 4X/IP67
Dimensions (h x w x d)
  • Overall: 7.88 in x 3.99 in x 2.56 in (200 mm x 101 mm x 65 mm)
  • Weight: 1.2 lb (550 g)
European Compliance Complies with EMC Directive 2004/108/EC and PED 97/23/EC for DN<25
Hazardous Area Certification
  • C_US Class I, Division 1, Groups A,B,C&D, Type 4X
  • II 1 G EEx ia IIC T4 (ATEX)
  • Ex ia IIC T4 (IEC Ex)

Moisture Sensor

Sensor Type Thin-film aluminum oxide moisture sensor
Calibration Each sensor is individually computer-calibrated against known moisture concentrations, traceable to NIST.
Calibration Interval Sensor recalibration by GE is recommended every six to twelve months depending on application.
Flow Rate Gases: Static to 100 m/s linear velocity at 1 atm

Built-In Temperature Sensor

Type NTC thermistor
Operating Range -22°F to 158°F (-30°C to 70°C)
Accuracy ±0.9°F (±0.5°C) overall
Response Time (Maximum) One second in well stirred oil or 10 seconds in still air for a 63% step change in increasing or decreasing temperature

Built-In Pressure Sensor

Type Solid state/piezoresistive
Available Ranges
  • 30 to 300 psig (3 to 21 bar)
  • 50 to 500 psig (4 to 35 bar)
  • 100 to 1000 psig (7 to 69 bar)
  • 300 to 3000 psig (21 to 207 bar)
  • 500 to 5000 psig (35 to 345 bar)
Accuracy ±1% of full scale (FS)
Pressure Rating Three times the span of the specified range to a maximum of 7500 psig (518 bar)

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Descriptions Russian Dutch English Français Deutsch Italiano Español
Basic Hygrometry Principles acrobat-reader
HygroPro Aluminum Oxide Moisture Transmitter Datasheet acrobat-reader acrobat-reader acrobat-reader
HygroPro Moisture Transmitter Operating Manual acrobat-reader acrobat-reader acrobat-reader acrobat-reader acrobat-reader acrobat-reader acrobat-reader


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