Portable explosion-proof gas detector

摘要

A portable explosion-proof gas detection device, comprises a housing which defines an interior flameproof motor chamber with an electric motor in the chamber having a pump drive shaft which extends outwardly into a pump chamber having a rotor connected to the electric motor shaft. The rotor engages a hose connection which is arranged in an openable chamber and which is engaged by a rotor over a pump squeezing surface defined the housing surrounding wall. The hose is connected through a twin fitting to a holder for a testing tube which has an opening at each end is positionable in a tube holder so that its open end is oriented in an opening in the housing for the inflow of air through the tube and through the pump for discharge out of the housing. The apparatus includes a control knob which actuates an electrical control circuit which is magnetically actuable by rotation of the knob to energize the electric motor from a battery source which is also arranged within the housing. The housing includes a cover which includes an end and a top wall portion which, when lifted upwardly, provides an access to the contact tube holder and also to the pump tube fitting to permit the replacement thereof, if necessary.