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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. The HygroPro moisture transmitter 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.


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


• 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

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 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 configuration 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 ppmv in gases, ppmw in liquids, pounds per million standard cubic feet in natural gas or percent 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 the top, bottom or side of a process pipe or sample cell.

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 field 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.

Learn about other aluminum oxide sensors available at BBP here.

Additional information


Chemical, Engineering, Food & Beverage, Oil & Gas, Pharmaceutical, Power Generation, Pulp & Paper, Refining, Water & Wastewater