Why is the output signal of the 402REU defined as the concentration of ethylene glycol (C2H6O2)?
C2H6O2 is a hydrocarbon and as such ionizes in the flame to C+ ions which the FID is sensitive to. You can calibrate the FID with a known concentration of C2H6O2 and report the output as ethylene glycol equivalents so that all HCs present read as ppm C2H6O2. Note: Vapor pressure above indicates that only about 53 ppm C26O2 (at 20 Deg C) can be in vapor state at 1 Bar A pressure. Ths means a cal tank of about 200 PSIG (13 Bar A) of only 3.97 ppm C2H602 in N2 can be made up by a gas cal supplier because of the condensing nature of ethylene glycol at high pressures. The volume in the cal tank is only about 400 liters, so it won’t last too long at 30 to 1000 ccm flow into the instrument.
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- Why is the output signal of the 402REU defined as the concentration of ethylene glycol (C2H6O2)?
