CM772F 3BDH000368R0001 ABB DCS ac700f Communication module

CM772F 3BDH000368R0001 ABB DCS ac700f Communication module

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Mole is a fundamental unit that describes the number of chemical molecules. One

mole always represents one Avogadro’s number 6.02x1023 of molecules. Number

of moles can be determined by the calculation formula: n=PV/RT.

Because sample and transport tubing volume and temperature are usually

constant, the number of sample moles in transit is a function of pressure in sample

transport tubing. Reducing gas sample pressure reduces the mass of gas in

sample transport tubing. This is referred to as “line peak”. Once transport volume

is known for standard conditions, transport lag time can be determined.

1.7.7 Maintaining Phase

When designing sample transport tubing, phase of sample must be maintained.

Gases, containing high concentrations of high boiling components, can cause

problems when they condense on the inside of the transport tubing surface. To

prevent condensation from occurring, heat trace transport tubing uses electrical

power, stream or hot glycol. This prevents components from condensing on

transport tubing walls and prevents any water within the tubing from freezing and

blocking sample flow.