The Signal Group’s 821S gas divider enables the users of gas analysers to test the linearity of their instruments - simply, quickly and accurately. Compliant Conforms to: US EPA Method D 205 US EPA CFR 40 part 1065 EN14181 annexe B and AST ISO 13485-2016 Uncertainty within 0.5% Constant output flow No change in flow with change in dilution Ancillary products working alongside our gas analysers Simply connect the gases and rotate the selector switch

821S Gas divider The Signal Group Gas divider has been designed for testing the linearity of any gas analyser. The 821S has ten identical capillaries and a precision balance regulator. The span gas can be selected to flow through a number of those capillaries with the diluent flowing through the remainder, to produce a ratio. Many types of gas analyser are inherently non-linear due to the physical nature of the analysing technique. Photometric analysers (NDIR, NDUV, FTIR / spectrophotometers) need to be linearised before they leave the factory and then at regular intervals during service. Other...