SERVOPRO DF high purity

The DF-749 moisture analyzer checks purity in UHP gases

Using Servomex’s Tunable Diode Laser (TDL) sensor the DF-749 provides trace/ultra-trace moisture measurements for checks of ultra-high-purity (UHP) electronic gases in a range of background gases.

Ideal for quality checks of UHP gases

Dan Johnson
Dan Johnson
Global Head of Product Management – P&S

The DF-749 provides trace and ultra-trace moisture contaminant measurements in a variety of background gases, including nitrogen, hydrogen, helium, argon and oxygen.

Ideal for quality checking of UHP gases used in LCD and LED manufacture, the DF-749’s compact form makes it easily portable for easy cart or mobile use. A robust hardware/software design virtually eliminates the dry-down times often associated with UHP gas checking.

Fast response measurements with a low LDL

Offering an ultra-sensitive Lower Detection Limit (LDL) of 1PPB, the DF-749 uses industry-leading TDL sensing technology to deliver ultra-reliable baseline measurements and a fast speed of response.

The analyzer is highly affordable over its product life, with a robust sensor construction that has low lifetime maintenance requirements and a zero-drift measurement stability that greatly extends calibration intervals. Factory pre-calibration also provides simplified set up.

High Stability TDL Trace

Modern LCD and LED manufacturing processes require an ultra- trace quality measurement for moisture contaminants in high purity electronics grade gases. In such a specific application, users need analysis capable of delivering high-accuracy and ultra-low detection limits in multiple background gases. No matter what your application requirements, you need a moisture analyzer that can also provide operational cost efficiencies. We don’t believe you should have to compromise.

A no compromise solution

The DF-749 NanoTrace is ideal for your applications, combining high stability trace and ultra-trace measurements with flexible portability. Using state-of-the-art TDL sensing – with zero drift and a fast speed of response – this device provides high stability accuracy that is ideal for upset prone applications. With a low LDL of 1PPB and the ability to monitor multiple background gases in N2, H2, He, Ar and O2 gas streams with a single unit, the DF-749 NanoTrace delivers a high accuracy, adaptable monitoring solution: one enhanced by a compact design simplifying port-to-port mobility, making it ideal for either a fixed or cart-based solution.

Simple maintenance and reduced ongoing costs

Proven sensing technology and advanced functionality delivers DF-745 users a low lifetime cost-of-ownership. Factory pre-calibration helps facilitate quick and easy installation; data archiving makes the storage and recall of calibration, system error and measurement data simple. The use of the high stability, TDL sensor – with zero drift potential – extends calibration intervals and minimizes ongoing maintenance needs, enabling considerable savings over a long product lifetime.

Servomex System components

Looking for an integrated system solution?

If you’re building a gas analysis system, we can help. Our expert team works with you to design, build and deliver the project you need to meet your process requirements. Get in touch to learn more.

Ready to buy? Here’s how it works

It’s easy to find the product you need for your application with Servomex

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

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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

woman Assembling Sensors


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

The benefits of TDL moisture measurement

The robust and ultra-reliable DF-749 provides flexible configuration options and a broad detection range of 0-20ppm.

High reliability

By minimizing water contact with optical components, the repeatable baseline measurements of the DF-749 are unaffected by loss in mirror reflectivity, ensuring accuracy and stability.

Exceptional performance

With analysis immune from gas cell concentration, the DF-749 continues to operate to specification with up to 90% signal loss.

Easy to use

Compact and lightweight, the DF-749 moves easily from port to port and is ideal for easy cart of mobile use.

Unrivalled performance

  • Analysis immune from gas cell concentration: DF-749 operates to specification with up to 90% signal loss
  • 2ppb Lower Detection Limit (LDL)
  • Manufactured by Servomex – over 60 years’ experience with thousands of units used in the field



  • Trace level Tunable Diode Laser (TDL) sensing provides high stability measurements through minimal moisture contact with optical elements
  • Broad detection range: 0-20ppm
  • Flexible configuration options: initiation via front panel/digital interconnect


Easy to use

  • Highly reliable with repeatable baseline measurements unaffected by loss of mirror reflectivity
  • Compact with a low weight; moves easily from port to port and ideal for other mobile applications


Low cost of ownership

  • Robust sensor construction reduces maintenance requirements
  • Zero drift measurement extends calibration intervals


Benchmark compliance

  • IEC 61010-1
  • Overvoltage Category II, Pollution Degree 2
  • EU EMC Directive
  • EU Low Voltage Directive



  • IEC 61010-1
  • Overvoltage Category II, Pollution Degree 2
  • EU EMC Directive
  • EU Low Voltage Directive

Schematics (select to expand)

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483mm (19”) Wide x 266mm (10.5”) High x 608mm (23.9”) Deep


31.8kg (70lbs)

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.”

Dan Johnson
Dan Johnson
Global Head of Product Management – P&S

Download the DF-749 resource pack

“Our comprehensive resource pack has all the details you need about the features and benefits of the DF-749. Download it now to ensure you have all the essential details at your fingertips.”


Dan Johnson
Dan Johnson
Global Head of Product Management – P&S

UHP Gases / Semiconductors

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