The Serinus® 57 Total Reduced Sulfur (TRS) analyser delivers precise and reliable performance at excellent value. It uses proven UV fluorescent radiation technology and an external thermal converter to measure TRS in ambient air (LDL < 0.3 ppb, range 0 – 2 ppm). TRS is measured by converting TS to SO2 using the external HTO-1000 converter and then measuring the resultant SO2 using the pulsed UV fluorescence technique.