An ethyl mercaptan detector is used. This instrument consists of a miniature insertion-type electrochemical sensor housed in a 3166 stainless steel casing, an epoxy-encapsulated intelligent transmitter module (ITM), and a sensor splash guard. The device has a range of 0-100 ppm, a response time of T90, and a power consumption of 2 W.
Ethyl mercaptan reacts with p-aminodimethylaniline in solution and in the presence of ferric chloride to form a red complex. The concentration of ethyl mercaptan is determined by colorimetric quantification. Required equipment includes a large bubble absorption tube, an air sampler (flow rate 0–1.5 L/min), a stoppered colorimetric tube (25 ml), and a spectrophotometer.
