The PHD-4 is a Sniffer type portable compact helium leak detector which includes a battery for autonomous use in the field and uses helium as a tracer gas. It allows detection of very small leaks, (5X10^-7 Pa-m³/s) in objects where a slight helium pressure has been introduced. The principle of operation of the PHD-4 is based on a patented technology called Selective Ion Pump Detection (SIPD) which is far superior and more sensitive than other types of Helium Leak Detectors like thermal conductivity cells.

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