Measuring hydrogen sulfide (H2S), the 931 is a rugged, single-ultraviolet (UV) component photometric analyzer with a low-maintenance, no-moving-parts design, housed in an explosion-proof package.
It can also be configured for primary measurements of sulfur dioxide (SO2), carbonyl sulfide (COS), carbon disulfide (CS2) or ammonia (NH3), and provided with a thermal conductivity detector (TCD) for the measurement of hydrogen (H2).