Combined hydrogen and pressure sensor assembly

A sensor having a semiconductor element for measuring hydrogen concentration in an insulating fluid in electric power generation, transmission, and distribution equipment having a mounting flange on the equipment providing access to the interior of the equipment provided with a plurality of bolt receiving openings arranged on the mounting flange in a first pattern comprising:

• (a) a first flange having at least one or more openings and an outer periphery;
• (b) a tubular housing support member having one end received in one of the openings;
• (c) a plurality of bolt receiving apertures arranged in a pattern corresponding to the first pattern within the outer periphery of the first flange;
• (d) a housing body having one end thereof connected to the tubular housing support member and disposed among the bolt receiving apertures, and spaced therefrom a sufficient distance to allow access to bolts disposed in the openings for inserting and removing bolts from the openings and having an outer periphery contained within the outer periphery of the first flange and further having a substantially uniform cross-section extending from the tubular housing support member;
• (e) at least one wire receiving opening extending through the housing body;
• (f) a cover closing an end of the housing body distal from the one end;
• (g) a first seal disposed between the first flange and the tubular housing support member;
• (h) a second seal disposed on the first flange for engaging the mounting flange;
• and
• (i) a sampling and bleeding valve extending through the first flange in communication with the interior of the equipment and oriented so that when opened trapped gas will exit the valve.