Patent ID: 9518968
Filing Date: 2016-12-13
CPC Classification: G01N

Claim Text:
1. An in situ oxygen analyzer comprising: a probe extendable into a source of process gas, the probe having an oxygen sensor and heater disposed therein, wherein the heater is configured to heat the oxygen sensor to a temperature sufficient to operate the oxygen sensor; a housing coupled to the probe, the housing having first and second chambers therein, the first chamber being explosion-rated and including non-intrinsically safe circuitry coupled to the heater to energize the heater, the second chamber containing only intrinsically-safe circuitry that complies with an intrinsically-safe specification; and wherein the first and second chambers are coupled together by an explosion-rated feed-through and wherein the non-intrinsically-safe circuitry is isolated from the intrinsically-safe circuitry through an energy-limiting isolator.