Profile: Agilent Technologies UK Limited specializes in offering gas & liquid chromatography, leak detection & mass spectrometry instruments and vacuum pumps. Our mass spectrometry is used for quantification of contaminants in soil and water. The PHD-4 is a compact, portable leak detector weighing only 5.7 pounds (2.6 kg) and operating for four hours on its own battery. It can detect very small leaks in objects that have a slight helium/air pressure inside. It is sensitive to helium concentration as small as 2 ppm, equivalent to a leak rate of 5 x 10-6 atm-cc/sec. Its selective ion pump detection (SIPD) technology enables the leak detection methods such as bubble-testing. Automatic tuning and zeroing make the unit easy to use without operator training.