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GE
Oil & Gas
HygroPro
Aluminum Oxide
Moisture Transmitter
Applications
This aluminum oxide moisture transmitter
measures moisture concentration in gases and
non-aqueous liquids from trace to ambient levels.
It is suitable for a wide range of industries:
• Petrochemical
• Natural gas
• Industrial gas
• Semiconductor
• Furnace gas/heat treating
• Power generation
• Air dryer
• Pharmaceutical
• Aerospace
Features
• Intrinsically safe
• Ambient to ppb moisture measurement; using
aluminum oxide moisture sensor
• Built-in temperature and pressure sensors
• Non-volatile calibration data storage
• 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
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The HygroPro moisture transmitter is an intrinsically
safe, compact, loop-powered moisture transmitter
designed specifi cally to meet the demands of rugged
industrial applications. With certifi ed intrinsically safe
electronics (when installed 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 or
non-aqueous liquid applications.
The HygroPro features an integrated backlit display
and six-button keypad to provide viewing of up to
three parameters simultaneously and to allow easy
navigation of the software for confi guration of the
display, analog and digital (RS485) outputs, and other
user functions and diagnostics. Via the RS485 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 and pressure transducer to provide
realtime measurement for calculation of parameters
such as ppm
in gases, ppmw in liquids, pounds per
v
million standard cubic feet in natural gas or percent
relative humidity. Three sensors mounted on a single
probe mount provide installation fl exibility when
space is limited. In addition, the HygroPro display
can be oriented in four different orientations to allow
installation of the moisture sensor in the top, bottom or
side of a process pipe or sample cell.
Advanced Moisture Sensor Technology
The HygroPro combines a technologically advanced
aluminum oxide moisture sensor with state-of-theart software and electronics for unequaled overall
performance.
NIST-Traceable Calibration
Superior sensitivity, speed of response, calibration
stability, and wide dynamic range have made GE
aluminum oxide moisture probes the standard
of performance and value in industrial moisture
measurement. They are suitable for laboratory and
industrial moisture measurement applications in gases
and non-aqueous liquids over a wide range of process
conditions.
All moisture probe calibrations are traceable to the NIST.
The rugged, compact HygroPro transmitter is designed
specifi cally for installations where space is at a
premium. It can be installed directly in the process
stream or, if necessary, in a sample system. If required,
GE can design and build a sample conditioning system
to meet unique application demands.
HygroPro
™
The HygroPro consists of a display/keypad housing, and
a replacement transducer element (RTE), which contains
the aluminum oxide moisture sensor, temperature
thermistor, and pressure transducer and associated
electronics. The RTE is fi eld replaceable by simply
removing a small mounting plate and disconnecting a
cable. Also, since the calibration data for the moisture
and pressure sensors are stored in a non-volatile
EEPROM in the RTE, a user does not need to enter any
calibration data manually when changing an RTE.
+
12 to 30 VDC
Power and Digital
Measurement
Circuits
Standard Analog Output Connection
Ground
-
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HygroPro Specifi cations
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
–4°F to 140°F (–20°C to 60°C)
Storage Temperature
158°F (70°C) maximum
Warm-Up Time
Meets specifi ed 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
4 in. (102 mm) 2.6 in. (65 mm)
™
HygroPro
g
8 in. (201 mm)
2.7 in. (68 mm)
HygroPro Dimensions
Mechanical
Sample Connection
• 3/4-16 in. (19 mm) straight male thread with O-ring
• G 1/2 with optional adaptor
Response Time
Less than fi ve seconds for a 63% step change in
moisture content in either wet-up or dry-down cycle
Electrical
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
• Cable: 6 ft (2 m), standard (consult factory for custom
lengths); cable includes molded weatherproof
connector with fl ying leads
Display
• 128 x 64 LED backlit LCD
• Display from one to three parameters and diagnostics
Operating Pressure
5 Hg to 5000 psig (345 bar)
Enclosure
Type 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 2004/108/EC
and PED 97/23/EC for DN<25
Hazardous Area Certifi cation
• 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)
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Moisture Sensor
Sensor Type
Thin-fi lm 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
HygroPro
Digital Communications Wiring Connection
and Networking Capability
™
- Black
+ White
Power and Digital
Communication
Circuits
RS485
RS485-RS232
Converter Box
PanaView™
Computer
RS232
Ground
Chassis
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)
Accuracy
±1% of full scale (FS)
Pressure Rating
Three times the span of the specifi ed range to a
maximum of 7500 psig (518 bar)
• 300 to 3000 psig (21 to 207 bar)
• 500 to 5000 psig (35 to 345 bar)
www.gemeasurement.com
© 2016 General Electric Company. All Rights Reserved. Specifi cations are subject to change without notice. GE is a registered trademark of General Electric Company. Other company or product
names mentioned in this document may be trademarks or registered trademarks of their respective companies, which are not affi liated with GE.
920-145E
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