DF-740 NanoTrace

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The DF-740 is designed specifically to monitor trace levels of moisture in electronics-grade ammonia. Servomex’s industry-leading TDL sensing technology and robust Herriot Cell enables an exceptionally broad measurement range of 10ppb-10ppm. By ensuring moisture only comes into contact with minimal optical components, the DF-740’s performance is unaffected by loss in mirror reflectivity - ensuring a fast response measurement that is stable, accurate and consistent.

This device is designed for long term unattended operation, delivering considerable cost-savings. The high stability optical TDL technology requires minimal ongoing maintenance, with zero drift enabling greatly extended calibration intervals. The combination of high performance, ultra-stable measurements and affordability make the DF-740 an attractive solution for electrograde NH3quality checking applications.

Tunable Diode Laser (TDL) trace moisture measurements, suitable for quality control of electronic grade ammonia gas production in LED plants

Gas: H2O

Measures: ppm and ppb

Application: Quality Control

Sensing Technology: Laser Moisture


  • Trace NH3 analysis for quality control of electronics-grade bulk gases used in LED production
  • Trace NH3 analysis for leak detection of electronics-grade bulk gases used in LED production


  • Trace level Tunable Diode Laser (TDL) sensing provides high stability measurements through minimal moisture contact with optical elements
  • Broad detection range: 1ppb – 10ppm
  • Operable via front panel or digital communication options

Easy to use

  • Simplified ongoing maintenance requirements with no consumables required
  • High reliability; repeatable baseline measurements are not affected by a loss in mirror reflectivity
  • Designed for long term unattended operation with minimal maintenance needs

Low cost of ownership

  • Maintenance periods extended by the use of patented ultra-stable, TDL sensing technology
  • Zero drift reduces calibration requirements

Unrivalled performance

  • Analysis immune from gas cell concentration: DF-740 operates to specification with up to 90% signal loss
  • 10ppb Lower Detection Limit (LDL)
  • Manufactured by Servomex - over 60 years’ experience innovating gas analysis with thousands of units used in the field

Benchmark compliance

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


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


  • 31.8kg (70lbs)


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


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