Model ASH 2000 has a probe design with pass/reject lamps, site illumination LEDs and a button for the summation of individual leaks. Other features include a do-it-yourself sensor replacement design. The detector houses a sensor that has sensitivity and selectivity to hydrogen. The test gas is a mixture of 95 percent nitrogen and 5 percent hydrogen that is treated no differently than any other inert pressurized gas.

Alcatel Vacuum Products, (781) 331-4200