PHD-4 Sniffer

The PHD-4 sniffer leak detector is a lightweight and rugged sniffer, sensitive to helium concentrations as low as 2 ppm – equivalent to a leak rate of 5 x 10–6 atm-cc/sec, far superior to bubble-testing, dye penetrants, and pressure decay. The sensitivity of the PHD-4 is enabled by Agilent’s proprietary and patented SIPD (Selective Ion Pump Detection) technology.

With automatic startup, self-test and calibration, the PHD-4 is easy to use with minimal training required. It is powered by a rechargeable battery pack with a 4-hour runtime.

Product details Related Product


  • Weighs only 2.6 kg (5.7 lbs) including the battery
  • Wide range of uses
  • Replaces or can be used with existing methods such as bubble test or pressure decay
  • Microprocessor control allows simple, flexible operation
  • Fully automatic startup
  • Ready for test in less than three minutes
  • Excellent selectivity for helium allows you to read helium leaks and ignore all other gases
  • Helium sensitivity can be adjusted as required to minimize test costs and helium consumption
  • Can operate either on battery power or line voltage
  • The display can be set to use any of four languages (English, French, German, or Italian)
  • Shipped with a power cord


Ambient Operating Temperature
  • -5 to +35 °C
  • 20 to 95 °F
Ambient Storage Temperature
  • -20 to +60 °C
  • 4 to 140 °F
Background Suppression
  • Automatic
Battery Pack
  • Detachable
  • Sealed
  • Four hours of operation with full charge
Lowest Helium Concentration
  • 2 ppm
Maximum Relative Humidity
  • 90 %
Minimum Detectable Leak
  • 5 x 10-6 atm·cc/s
    5 x 10-6 mbar·l/s
    5 x 10-7 Pa·m3/s
Power Requirements
  • 12 VDC from battery pack, car battery, or transformer
Recovery Time
  • <10 seconds from 50 to 0 PPM
Response Time
  • <2 seconds
Start Up Time
  • ~3 minutes
Transformer Power Supply
  • 110-240 V
  • 50-60 Hz
  • Automatic
  • 2.6 kg



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