HygroPro

Aluminum Oxide
Moisture Transmitter
Applications

FeaturesThis aluminum oxide moisture transmitter measures moistureconcentration in gases and non-aqueous liquids from trace toambient levels. It is suitable for a wide range of industries:• Intrinsically safe

• Petrochemical• Ambient to ppb moisturemeasurement; using aluminumoxide moisture sensor• Natural gas• Built-in temperature and pressure sensors• Industrial gas• Non-volatile calibration data storage• Semiconductor• Calibrations traceable to National Institute of Standardsand Technology (NIST)• Furnace gas/heat treating• Power generation• Air dryer• Pharmaceutical• Aerospace• Requires only twisted pair cabling• Complete program capability via six-button keypad• Integrated display/user interface• Analog and digital outputs

The HygroPro moisture transmitter is an intrinsically safe,
compact, loop-powered moisture transmitter designed
specifically to meet the demands of rugged industrial
applications. With certified intrinsically safe electronics (wheninstalled with proper protection) packaged in an IP67/Type 4X
housing, the HygroPro is ideal for use in pipeline natural gas,petrochemical, power generation and other industrial gas ornon-aqueous liquid applications.
The HygroPro features an integrated backlit display and sixbutton keypad to provide viewing of up to three parameterssimultaneously and to allow easy navigation of the software
for configuration of the display, analog and digital (RS485)
outputs, and other user functions and diagnostics. Via theRS485 interface, the HygroPro built-in multidrop capability
allow multiple units to be connected on a single network.
Using an industry-proven aluminum oxide moisture sensor,
the HygroPro features a built-in temperature thermistor andpressure transducer to provide real time measurement forcalculation of parameters such as ppmv in gases, ppmw inliquids, pounds per million standard cubic feet in natural gas orpercent relative humidity. Three sensors mounted on a single
probe mount provide installation flexibility when space is limited.
In addition, the HygroPro display can be oriented in four different
orientations to allow installation of the moisture sensor in thetop, bottom or side of a process pipe or sample cell.

Advanced moisture sensor technology
The HygroPro combines a technologically advanced aluminumoxide moisture sensor with state-of-the-art software andelectronics for unequaled overall performance.

NIST-traceable calibration
Superior sensitivity, speed of response, calibration stability,
and wide dynamic range have made Panametrics aluminumoxide moisture probes the standard of performance and value
in industrial moisture measurement. They are suitable forlaboratory and industrial moisture measurement applications
in gases and non-aqueous liquids over a wide range ofprocess conditions.
All moisture probe calibrations are traceable to the NIST.
The rugged, compact HygroPro transmitter is designed
specifically for installations where space is at a premium. It canbe installed directly in the process stream or, if necessary, in asample system. If required, GE can design and build a sample
conditioning system to meet unique application demands.

The HygroPro consists of a display/keypad housing, and areplacement transducer element (RTE), which contains thealuminum oxide moisture sensor, temperature thermistor, andpressure transducer and associated electronics. The RTE isfield replaceable by simply removing a small mounting plateand disconnecting a cable. Also, since the calibration data
for the moisture and pressure sensors are stored in a nonvolatile EEPROM in the RTE, a user does not need to enter any
calibration data manually when changing an RTE.

Standard analog output connection

HygroPro specifications

Calibration ranges (dew/frost point)Standard: 50 to -112°F (+10 to –80°C) with data from+68 to -166°F (+20 to -110°C)
Operating temperature-4°F to 140°F (–20°C to 60°C)
Storage temperature
158°F (70°C) maximumAccuracy• ±3.6°F (±2°C) above -148°F (-100°C)• ±5.4°F (±3°C) below -148°F (-100°C)

Moisture sensor
Sensor TypeThin-film aluminum oxide moisture sensor
Calibration
Each sensor is individually computer-calibrated against
known moisture concentrations, traceable to NIST
Calibration interval
Sensor recalibration by Panametrics is recommended every
six to twelve months depending on application
Flow rate
Gases: Static to 100 m/s linear velocity at 1 atm

Repeatability• ±0.4°F (±0.2°C) above -148°F (-100°C)

Temperature sensor• ±0.9°F (±0.5°C) below -148°F (-100°C)

Sensor TypeNTC thermistor

Electrical

Operating range-22°F to 158°F (–30°C to 70°C)

Power• Voltage: 12 to 30 VDC (loop-powered, customer supplied)• Output: 4 to 20 mA analog, RS485 digital• Output Resolution: 0.01 mA/12 bits

• Load: Max R = (PSV x 33.33) - 300
Example: (24 x 33.33) - 300 = 500 W• Cable: 6 ft (2 m), standard (consult factory for customlengths); cable includes molded weatherproof connector
with flying leads
Display• 128 x 64 LED backlit LCD

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
Sensor type
Solid state/piezoresistive• Display from one to three parameters and diagnostics

Available Ranges• 30 to 300 psig (3 to 21 bar)

Mechanical• 100 to 1000 psig (7 to 69 bar)

Sample connection• 3/4-16 in. (19 mm) straight male thread with O-ring• G 1/2 with optional adapter

Operating pressure
5 μm Hg to 5000 psig (345 bar)
EnclosureType 4X/IP67
Dimensions• H x W x D: 7.88 x 3.99 x 2.56 in. (200 x 101 x 65 mm)• Weight: 1.2 lb (550 g)

European compliance
Complies with EMC directive 2014/30/EU
Hazardous area certification• C-US Class I, Division 1, Groups A,B,C&D, Type 4X• EX II 1 G EEx ia IIC T4 (ATEX)• Ex ia IIC T4 (IEC Ex)• 50 to 500 psig (4 to 35 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 maximumof 7500 psig (518 bar)HygroPro dimensions

Digital Communications Wiring Connection
and Networking Capability

Panametrics, a Baker Hughes Business, provides solutions in
the toughest applications and environments for moisture,oxygen, liquid and gas flow measurement. Experts in flaremanagement, Panametrics technology also reduces flareemissions and optimizes performance.
With a reach that extends across the globe, Panametrics’
critical measurement solutions and flare emissions
management are enabling customers to drive efficiency
and achieve carbon reduction targets across criticalindustries including: Oil & Gas; Energy; Healthcare; Water andWastewater; Chemical Processing; Food & Beverage andmany others.
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BHCS38682		

(10/2023)

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