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LD-920 Nitrogen / Hydrogen Trace Gas 

Leak Detector   
This instrument supplied by Imperial Tools Australia, will detect the Hydrogen in the Trace Gas [ 95% Nitrogen / 5% Hydrogen].
Leaks less than 5 parts per million [ppm] or equivalent in R134a would be 2.0 grams per year leak rate.
The LD-920 detects the Hydrogen component of the Trace Gas & cannot be used with straight Nitrogen.
The tracer gas mixture consists of a non toxic, non flamable, environmentally friendly mixture of 5% Hydrogen and 95% Nitrogen. Trace Gas was developed to remove the need to add poluting refrigerants in the system when pressurising systems for leak detection. For this reason it can be vented to atmosphere at completion.
To use Trace Gas, charge it into your new or decanted system at a pressure of approx 500 Kpa [75 Psi]. As Hydrogen is lighter than air, always sniff for samples above your suspected leak area, welds or fittings. Maximum distance away from sampling area is 9.5mm at a rate no faster than 75mm per second. Refer to the Operators Manual for futher useage information.


  • Heated Sensor Technology - Long Life
  • <5ppm Sensitive to N2/H2
  • Digital Display for leak size
  • Automatic Calibration & resets to ambient
  • Visual LED leak alarm near sensor
  • Audio Mute Mode
  • 3 Sensitivity Selectable Levels
  • Fast Warmup - less than 20 Seconds
  • 4-6 Hours continuous on battery life



  • Refrigerant Leak Detector - LD-920
  • 5 x Sensor Filters - Part # S77695
  • Leak Test Vial - Part # S77705
  • H2/N2 Sensor with Wand Sensor Tip & Filter - Part # S77704
  • Wand Sensor Tip with Filter - Part # S77698
  • Blow Molded Hard Case - Part # S77707
  • 4 x AA 1.5vdc Alkaline Batteries
If you require a complete Parts Kit - [ includes Sensor, Test Vial & Filters ]
use Part # S77706 

LD-920 Specifications

  • SENSITIVITY < 5 ppm
  • SENSOR LIFE > 10 years
  • RESPONSE TIME Instantaneous 
  • POWER SUPPLY 4 AA alkaline batteries 
  • BATTERY LIFE  8 hours continuous 
  • WARM UP TIME < 20 seconds 
  • PROBE LENGTH  17" (43.8 cm) 
  • NUMERICAL DISPLAY 7 segment digital display (1 to 9) 
  • WEIGHT  1.25 lbs. (0.57 kg) 
    EMC Directive 2014/30/EU
    2006.40/EU Article 6, Paragraph 3
  • WARRANTY 2 years 

SKU LD-920
Brand Imperial
Shipping Weight 1.5000kg
Shipping Width 0.400m
Shipping Height 0.300m
Shipping Length 0.150m
Shipping Cubic 0.018000000m3
Unit Of Measure ea
2 Years from Date of Purchase
​Excludes Consumables such as Filters, Gaskets, Leads, Batteries, Fuses, Sensors, Case etc

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