Hydrogen Leak Detector


Ex-Certified Hydrogen Leak Detector


Product configurator

Gemini™ MxG5xx

Sensor version
Ionization chamber
Emmision current
Flange connection to vacuum chamber
Switching function
Electrical connection
Digital interface
Analog output signal
Your configuration
Gemini™ MxG5xx
Switching functions
Electrical Connection
FCC, 8-pin
Digital Interface
Measurement range
1.2 - 8.68 V
Personal information
Gemini™ MxG5xx
Gemini™ MAG500
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The portable Extrima Leak Detector is the ultimate intrinsically safe instrument for leak detection in the toughest environments, including hazardous locations such as Zone 0 (corresponding to Division 1).

The Extrima allows you to quickly find leaks on a wide range of industrial applications such as aircraft and hydrogen cooled generators. With the Extrima the aviation industry has a safe, accurate and yet simple solution for leak testing of complete fuel systems, both in production and maintenance situations. Thanks to its high sensitivity, the Extrima can detect even minute leaks with pinpoint accuracy. Extensive tests have shown that using the Extrima can reduce the average time by more than 50 % for identifying, locating and repairing a leak on a fighter jet during maintenance.

It is certified for use in Zone 0, classification Ex ia, IIC T3 with ATEX, IECEx, TIIS, NEPSI and CSA certificates. The Extrima can be used to trace leaks using Forming gas (5% H2/95% N2) or in applications where pure hydrogen is used. 


  • Intrinsically safe: Ex ia IIC T3
  • High sensitivity 0.5 ppm/ 5E10-7cc/s using 5% H2/95% N2
  • Waterproof: IP 67
  • 1 minute start up time
  • Unique selectivity to hydrogen


  • Intrinsically safe for use in hazardous areas (Ex ia IIC T3)
  • Robust enclosure for demanding field use
  • High sensitivity and fast recovery allow for efficient operation
  • Low and easy maintenance
  • Portable, battery operated (more than 7 hours of use per charge)
  • Sensor change in less than a minute
  • Incorporates the proven Sensistor technology developed for using forming gas (5% hydrogen in nitrogen) as tracer gas

Typical Applications

  • Aerospace – complete fuel systems, oxygen supply, cooling systems and fire extinguishing systems, both in production and maintenance
  • Power production – hydrogen-cooled generators and fuel cells
  • Process industry – e.g., pipe systems, valves and containers
  • Petro chemical industry


Minimum detectable leak rate 
Measuring mode0.5 ppm - 0.2% H2
Locating mode

5 x 10-7 cc/s (using 5 % H2 tracer gas)


Ex classification

Ex ia IIC T3


Battery Capacity - full charge, screen saver activated

Up to 7 h at >15°C (59°F)


Weight (excl. probe and probe cable)4.5 kg (10.0 lb.)

Part Number

Spare Parts
Part NumberDescription
Part NumberDescription
590-606Hand Probe PX57 (rigid neck)
590-607Hand Probe PX57 Flex (flexible neck)
590-618Injection Fix Kit, for injecting tracer gas to leaks on uneven surfaces
590-619Injection Panel, for easy gas injection from bottle to Injection Pad
590-621Complete Gas Injection Kit (incl. Injection Panel, Injection Fix Kit and Injection Pads)
590-421Calibration Leak Type B, 5x10E-3 mbarl/s @1bar
590-422Calibration Leak Type C, 5x10E-4 mbarl/s @1bar
590-427Calibration Leak Type E, 10g/a
590-429Calibration Leak Type G, 3g/a
Part NumberDescription
590-615Injection Pads Small, 60 mm, 10 pcs (for filling tracer gas into fuel tanks)
590-616Injection Pads Large, 150 mm, 10 pcs (for filling tracer gas into fuel tanks)
590-270Antistatic Sensor Caps (50 pcs) for Hand Probe
590-292Replacement Hydrogen Sensor for Hand Probe P60, P60 Flex, P50, P50 Flex, PX57, PX50 Flex,PK50 and PK50 Flex
591-038Water Protective Tape, for waterprotecting the sensor
Part NumberDescription
590-260CX21 Probe Cable, 9.8 ft (3m) for Hand Probe PX57. PX57 Flex, PX50 and PX50 Flex
590-265CX21 Probe Cable,16.4 ft (5m) for Hand Probe PX57. PX57 Flex, PX50 and PX50 Flex
591-656Battery Charger (includes P/N 592-101 and P/N 592-102)
592-101Charging Adapter 
592-102Power Supply 
598-147Sensor Key (for Hand Probe P60, P60 Flex, P50, P50 Flex, PX50 and PX50 Flex)
591-687Shoulder Strap