Panametrics HygroPro II Aluminum Oxide Moisture Transmitter

Overview

The Panametrics HygroPro II aluminum oxide moisture transmitter is engineered by Panametrics to measure trace moisture concentration in gases and non-aqueous liquids from ambient levels down to parts-per-billion. Built as an intrinsically safe, compact, loop-powered display transmitter, the HygroPro II combines a next-generation aluminum oxide moisture sensor with an integrated backlit display and six-button keypad, giving process technicians full local configuration and readout without a separate host analyzer console. It builds on decades of Panametrics moisture measurement technology and is refined for the rugged demands of industrial hydrocarbon processing.

With fast quotation turnaround and technical support, Seven Star LLC proudly supplies the Panametrics HygroPro II moisture transmitter to gas processing, petrochemical and power generation facilities across Oman and the wider GCC. Engineering teams in Muscat, Sohar and Salalah rely on Seven Star LLC to specify the correct probe configuration, pressure option and hazardous area certification for their process, with technical support on selection before ordering.

Measurement Principle

The HygroPro II uses a thin-film aluminum oxide moisture sensor whose capacitance changes in proportion to the partial pressure of water vapor absorbed into the sensor’s porous oxide layer. Because the aluminum oxide layer equilibrates quickly with the surrounding gas or liquid, the sensor responds rapidly to changing moisture levels while remaining stable over long service intervals when properly calibrated. Each sensor is individually computer-calibrated against precisely known moisture concentrations traceable to national metrology standards, ensuring that dew/frost point readings reported by the transmitter are directly comparable across installations and over time.

A built-in NTC thermistor provides real-time temperature compensation of the raw moisture signal, and an optional piezoresistive pressure transducer – selectable in ranges from 30 to 5,000 psig – allows the HygroPro II to calculate derived parameters such as ppmv, ppmw and pounds per million standard cubic feet directly at the transmitter. Because the measurement relies on sensor equilibration rather than mechanical sampling, there are no moving parts, no consumable reagents, and no pressure drop introduced into the process line, which keeps installation simple and maintenance minimal.

Engineering Design of the Panametrics HygroPro II

The Panametrics HygroPro II consists of a display and keypad housing paired with a field-replaceable transducer element (RTE) that carries the aluminum oxide sensor, thermistor, optional pressure transducer, and calibration data stored on a non-volatile EEPROM. This design means a technician can swap a worn or damaged sensor element in the field in minutes, without recalibrating the unit manually, because the replacement RTE carries its own factory calibration data automatically read by the transmitter electronics.

The enclosure is rated Type 4X, IP66 and IP67, with certified intrinsically safe electronics suitable for Class I Division 1/2 and Zone 0/2 hazardous locations under ATEX, IECEx and North American approvals. Process connection is via a 3/4-16 in. straight male thread with O-ring, or G1/2 with an optional adaptor, and the unit communicates over a loop-powered 4 to 20 mA output with HART digital communication overlay, supporting multi-drop networking so several HygroPro II transmitters can share a single communications loop back to the control room.

Key Features

The Panametrics HygroPro II moisture transmitter delivers accurate, field-serviceable trace moisture measurement for demanding industrial gas and hydrocarbon liquid applications. Every Panametrics HygroPro II unit ships fully calibrated and ready for field commissioning:

• Ambient to parts-per-billion moisture measurement using next-generation aluminum oxide sensor technology.
• Integrated backlit display and six-button keypad for full local configuration without a separate host device.
• Field-replaceable transducer element with automatic, non-volatile calibration data transfer.
• Built-in temperature sensor and optional pressure transducer for real-time compensated moisture readings.
• Calibration traceable to NIST or NPL, with an optional ISO 17025 accredited calibration certificate.
• 4–20 mA loop-powered output with HART digital communication and multi-drop networking support.
• Intrinsically safe design certified for ATEX, IECEx and North American Class I Division 1/2 hazardous locations.
• Rugged Type 4X, IP66/IP67 enclosure suitable for outdoor and harsh process environments.

Industrial Applications

The Panametrics HygroPro II is deployed across natural gas transmission and processing, LNG facilities, petrochemical plants, and power generation stations where trace moisture in a process gas or hydrocarbon liquid stream must be continuously monitored to prevent hydrate formation, corrosion, or off-specification product. It is equally suited to industrial gas production, semiconductor process gas supply, furnace atmosphere control in heat treating operations, and compressed air dryer performance verification, wherever a permanently installed, field-serviceable moisture transmitter is preferred over a portable analyzer.

With engineering support in Muscat, Seven Star LLC supplies the Panametrics HygroPro II to gas processing plants, refineries and industrial gas producers throughout Oman and the GCC, including operators in the Sohar and Salalah free zones. Local application support means facility engineers across the Sultanate of Oman and neighboring GCC states can configure the correct pressure transducer range, calibration certificate, and hazardous area approval before ordering, backed by Seven Star LLC’s technical team.

Technical Specifications

The specifications below summarize the standard Panametrics HygroPro II configuration; probe options and calibration ranges for the Panametrics HygroPro II can be tailored to the application.

HygroPro II Option Code Breakdown

The order string follows the pattern HYGROPROII-B-C-D-E-F-G-H-I-J. Position B selects the cable: 2 m or 10 m, in black or blue. Position C selects the pressure transducer on the probe: none, 30 to 300, 50 to 500, 100 to 1000, 300 to 3000 or 500 to 5000 psig. Position D adds cleaning for oxygen service. Position E selects the calibration certificate: none, NIST, ISO 17025 or NPL. Position F selects the O-ring: standard Viton, Teflon, CPA-70 or Kalrez, and position G adds NACE / EN 10204 3.1 material certification.

Position H sets the calibration: standard, -80 to +10 °C dew/frost point with data from -110 to +20 °C, or low-end, -100 to -50 °C with data from -110 to -50 °C. Position I sets the area certification: general purpose safe area, US/Canada Class I Division 1, US/Canada Class I Division 2 non-incendive, or IECEx/ATEX Ex ia (Zone 0) or Ex ic (Zone 2). Panametrics notes that the Division 1 and Ex ia versions require an intrinsic safety barrier, which is sold separately. Position J is reserved for factory specials.

Selection and Recalibration Notes

Choose the pressure transducer range so that normal line pressure falls inside it; the stated accuracy is ±1% of full scale and the transducer is rated to three times the span of the range, up to a maximum of 7500 psig. Panametrics recommends recalibrating the moisture sensor every six to twelve months depending on the application. Because calibration data is stored in the replaceable transducer element, a freshly calibrated element can be fitted on site by loosening the mounting screws and disconnecting one internal cable, with no calibration data to enter by hand.

Request a Quote for Panametrics HygroPro II Aluminum Oxide Moisture Transmitter

Ready to specify the Panametrics HygroPro II moisture transmitter for your gas or liquid process? The Panametrics HygroPro II is supplied on request and supported regionally, with lead time confirmed at quotation. Seven Star LLC processes formal RFQs, confirms lead time and availability at quotation, and provides technical datasheets for engineering review. Backed by manufacturer datasheet documentation, our instrumentation division can help select the correct pressure transducer range and hazardous area certification for your facility – contact Seven Star LLC today to request a quotation for the HygroPro II.

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