INFICON Explorer Portable Gas Chromatograph - Manual (Page 216)

Calibration
214
Calibration Gas
Calibration gas containing all of the compounds of interest. The compounds
and the concentration of the calibration gas will depend on your application.
When ordering calibration gas, specify each compound and concentration.
Specify a 5% blend tolerance, and a 2% analytical tolerance.
Standards must be made up in hydrocarbon free air. Balance air should not
have more than 0.1 ppm total hydrocarbons (THC). If your standards are
unstable in air or if you are using nitrogen as carrier gas you may obtain your
calibration standards made up in nitrogen. Balance nitrogen should not have
more than 0.1 ppm total hydrocarbons (THC).
When selecting calibration gas, keep in mind the upper and lower limits of the
assay. Order each compound at a concentration that is close to the value of
interest.
NOTE: Since your samples will all be in air, it is not necessary to obtain standards in
nitrogen if you are using nitrogen carrier gas.
Calibration gas regulator, with 1/4” compression fitting outlet. Use only the
specified regulator for calibration gas. The regulator must be able to deliver up
to 14 psig and 300 ml/min. Confirm regulator type and material with your
specialty gas supplier.
Obtain a regulator with the appropriate inlet fitting for your calibration tank.
Contact your specialty gas supplier for details.
Check with your specialty gas supplier for any special accessories required for
your regulator. Tighten the regulator onto the tank with a wrench. Do not over-
tighten.
NOTE: Do not force the connection. Do not use Teflon tape with CGA fittings. In general,
these fittings are designed for metal to metal sealing.
NOTE: Do not use adapters to connect one CGA fitting to another type of CGA fitting. If the
regulator does not match the outlet on your calibration tank, contact your specialty
gas supplier.