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The AquaXact 1688 is a fast, accurate moisture sensor

A rugged ultra-thin film Aluminum Oxide moisture sensor, the AquaXact 1688 enables the measurement of moisture in a wide variety of gas phase process applications, such as glove boxes, air separation units, regenerative skid dryers, combustion, and instrument air, with no calibration required after dry-out.

A standalone sensor with a range of connection options

The AquaXact 1688 is a rugged, ultra-thin film Aluminum Oxide (Al2O3) moisture sensor that enables fast and accurate dew point/ppm H2O measurements of moisture in a wide variety of gas phase process applications.

Not only is it a standalone 4-20mA transmitter, but it is also able to be connected to the SERVOPRO MonoExact DF310E, AquaXact 1688 digital controller and SERVOPRO MultiExact 4100. These devices provide a high-clarity color touchscreen display, alarms, relays and advanced communication protocols including RS485, Modus RDU, Modbus TCP/IP and PROFIBUS.

Douglas Barth
Senior Global Product Manager

Field-replaceable sensor tip in a robust casing

The AquaXact 1688’s Al2O3 thin film sensor tip can be replaced by the user and the associated calibration file loaded into the transmitter using a digital controller, eliminating the need for return-to-factory calibrations. The sensor element is NIST-traceable and field replaceable, for hassle-free continuous operations.

Stainless steel, weatherproof casing enables operation in ambient temperatures ranging from -10 to +70°C (14 to 158°F).

High performance

The AquaXact 1688 is a rugged ultra-thin film aluminum oxide moisture sensor that enables fast and accurate dew point and ppm H2O measurements. The innovative design of the aluminum oxide sensor means that it rapidly comes into equilibrium with the surrounding atmosphere, with the sensor varying in direct proportion to the water vapour content making this a high-performance sensor.

Versatility

With the ability to be used in a wide range of applications such as combustion, cryogenic gases, ethylene gas, gloveboxes, hopper dryers, natural gas production, ASU and many others, it makes this a highly versatile and invaluable sensor. Not only is it a standalone 4-20mA transmitter, but it is also able to be remotely interfaced via a digital cable (up to 200m) to the AquaXact 1688 digital controller, SERVOPRO MonoExact DF310E and the SERVOPRO MultiExact 4100. The AquaXact 1688 digital controller provides a high-clarity color touchscreen display, alarms, relays and advanced communication protocols including RS485, Modus RDU, Modbus TCP/IP and PROFIBUS. There is also a wide variety of sampling systems available to order, which makes it easier to attach to a wide variety of applications.

Simple maintenance and reduced ongoing costs

The ability to plug this sensor into the AquaXact 1688 digital controller, SERVOPRO MonoExact DF310E and the SERVOPRO MultiExact 4100 makes this a quick and simple sensor to install and use. The sensor element can be easily replaced by the user and the associated calibration file loaded into the transmitter using the controller, eliminating the need for return-to-factory calibrations. Yearly field calibration adjustments require only a single gas standard.

We have the expertise your system needs

Do you need a gas analysis system for your process? Our experts can deliver a solution from the first design stages to installation and beyond. Get in touch to find out more about our collaborative approach and state-of-the-art system builds.

Ready to buy? Here’s how it works

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Enquiry

Get in touch to tell us what you need and the application you plan to use it for

Consultation

Our expert team will help you select the right product package, ensuring you have the accessories and support to get the best performance from your analyzer

Fulfilment

Your analyzer will be assembled in one of our state-of-the-art engineering centers and rapidly dispatched to your site

A high-performance moisture measurement solution

The pore structure and geometry of the Aluminum Oxide sensor ensures the AquaXact 1688 delivers fast, accurate and stable moisture measurements, with reduced drift and easy maintenance.

Flexible

The AquaXact 1688 functions as a standalone 4-20mA transmitter or remotely interfaces with a digital controller or compatible analyzer.

Easy recalibration

The sensor element used in the AquaXact 1688 is NIST-traceable and field-replaceable.

Rugged

A stainless steel weatherproof casing (Class 1 Division 2) enables operation in ambient temperatures ranging from -10 to 70oC (14 to 158oF).

Flexible

  • Dew point range -100°C to +20°C
  • Functions as a standalone dew point transmitter – 4-20 mA loop-powered
  • Range of engineering units: °C, °F, ppmV

Easy to use

  • Interfaces with SERVOPRO MonoExact DF310E gas analyzer system and AquaXact controller via digital interface – maximum cable length 200 meters
  • In addition to standard analog outputs, RS485, Modbus RDU, Modus TCP/IP and PROFIBUS communications are available

Low cost of ownership

  • High-performance ultra-thin high-capacitance aluminum oxide sensor is easily replaceable in the field
  • No more than annual calibration when used with clean, non-corrosive gases

Unrivalled performance

  • High accuracy ± 3°C, Repeatability ± 0.5°C
  • Accurate dew point measurements over its full range, even under extreme temperature conditions
  • Unaffected by condensation and liquid water

Benchmark compliance

  • IP65 rated connector
  • Hazardous Area versions (Zone 2/Div 2) available soon

Gases sensed, measurements and technologies

The AquaXact is a fast and resilient moisture transmitter suitable for measurements in a wide variety of gas phase applications.

Gas Measurement
Water vapour (Moisture) (H₂O)dp, ppmv

Technologies

Certifications

  • IP65 rated connector
  • Hazardous Area versions (Zone 2/Div 2) available soon

Schematics (select to expand)

Size

Diameter: 44 mm (1.73”)Length: 188 mm (7.4”) 

Weight

227g (0.7lb)

Get the detailed specifications

“For in-depth specifications you’ll want to download our technical datasheet which includes information on technology, performance, operating environment, sample conditions and compliance along with technical drawings and top-level benefits and applications.”

Douglas Barth
Senior Global Product Manager

Download the AquaXact 1688 resource pack

“Get everything you need to know about the AquaXact 1688 in a single download. We’ve packaged together details about the features, benefits and specifications of this innovative moisture transmitter solution.”

Douglas Barth
Senior Global Product Manager

Manuals and brochures

Download the operator manual and product brochure to learn about the advantages and technical performance of the AquaXact 1688.

AquaXact 1688 Product brochure and technical data

AquaXact 1688 Product brochure and technical data

AquaXact 1688 moisture analysis expert paper

AquaXact 1688 moisture analysis expert paper

See for yourself

Our videos give you the chance to watch our products in action and hear from our experts. You can also see our analyzers unboxed, and find out more about our solutions for key applications

Unboxed: AquaXact 1688 & Controller

Applications Manager Chris Davis unpackages this moisture solution

Dual measurements for oxygen and moisture

Douglas Barth demonstrates how the MonoExact DF310E and AquaXact 1688 work together

MonoExact DF310E and AquaXact 1688

A combined solution for the dual measurement of moisture and oxygen 

SERVOPRO AquaXact 1688

Discover the advantages of this moisture sensor in our product video

Typical applications

The AquaXact 1688 enables moisture measurement in a wide range of gas phase process applications, with no calibration required after dry-out.

Air Separation Units | Natural Gas Processing and Transportation | Glove Boxes  Instrument Air Units | Ethylene Production | Refining Gases | Medical Gases | Semiconductors | Furnace Gas/Heat Treating | Power Generation | Air Dryers | Pharmaceutical | Aerospace 

 

Ethylene production

We have the solutions to make your process more efficient

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Air separation units

Diverse sensing solutions that adapt to your process

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Medical gases

An advanced solution for purity assay and impurity detection

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UHP Gases / Semiconductors

A comprehensive systems solution

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Process heaters and furnaces

A choice of technologies to fit your application

Learn more

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