HD-28A

The Model HD-28A portable “K-Flow” bench type constant flow air sampler is designed for use on perimeter and off-site monitoring stations in environmental monitoring systems and in production and laboratory areas where collection of precise air samples is required. Its combination vacuum pump and constant air flow regulator permits the collection of an airborne particulate and iodine sample at a constant flow rate until the ΔP across the filter media exceeds the capability of the pump. The higher flow rate the lower the ΔP for constant flow control. The controlled flow rate is adjustable from 0.5 to 3.5 CFM through various diameter filters (such as fiberglass and membrane types) and charcoal or silver zeolite cartridges used for Iodine-131 collection.

An internal air filtering system has been installed between the regulator valve and the pump to prevent particulates from reaching the self-adjusting carbon vanes and causing excess wear. A minimum of preventive maintenance assures a long performance life for the pump. A resettable elapsed time meter is mounted on the front instrument panel. By setting this timer to zero at the start of each sample period, an accurate sample volume may be readily calculated.