OPERATING PRINCIPLE

The SO3 or H2SO4 in the gas sample is absorbed as sulphate ions (SO42-) in an aqueous solution of propan-2-ol in water.

The solution is passed through a bed of barium chloranilate. The acid chloranilate ions created are measured in a continuous

flow photometer. By maintaining a constant ratio of flow rates for the gas and the propan-2-ol absorbing solution,

the concentration of acid chloranilate ions can be directly related to the sulphate ion concentration in the absorbing solution,

and hence the SO3 concentration in the gas.

 TECHNICAL SPECIFICATION

Range 0 - 200 ppm

Accuracy +/- 5% of reading (in calibrated range)

Lag time Approx. 60 seconds

Response (90% FSD) Approx. 120 seconds (depending on umbilical length)

Solution consumption 0.25 - 2 cm3/h (adjustable as required)

Ambient temperature 0 - 40?C

Module dimensions

Analysis 19? unit, 6U high, 500mm deep (27 kg)

Control 19? unit, 4U high, 500mm deep (13 kg)

Power Requirement 230V 50/60 Hz or 110V 50/60 Hz, 350 W

Probe Length 1 m, 1.2 m, 1.5 m, 2 m

Signal Output 4 .. 20 mA output for Recorder

RS232 to PC connector on request