INFICON 2020ppbPRO Portable Photoionization Detector - Manual (Page 100)

94 ISP-074-576-P1D 94
Figure 22. Using the Gas Bag
Presets and Response Factors
Presets simplify Memory Slot programming, and provide standard response factors
and alarm levels for approximately 100 compounds. The name, response factor and
three alarm levels are all set from the preset.
You can change any of the values entered in the Memory Slots. Changes made to
the library information that has been loaded into a Preset will have no effect on the
original library entry.
The response factors were determined over the range 5 - 500 ppm, based on a 100-
ppm isobutylene calibration. Isobutylene RF = 1.0. The following formula is used for
calculation of response factors:
Response Factor = Actual Concentration
2020ppbPRO Response
A response factor less than 1.0 indicates a compound response better than that of
isobutylene. A response factor greater than 1.0 indicates a lower response than that
of isobutylene.
NOTE: It does not matter which response factor is entered. The 2020ppbPRO ’s response is
not specific to any one compound. The displayed reading represents the total
concentration of all ionizable compounds in the sample.
Locking Ring
Tube Stub
Gas Bag Valve Injection Port
Septum Retainer
Replacing the Septum
Remove retainer and
replace silicone septum.
Place septum with
Teflon side down. Replace retainer
Do not overtighten.
Overtightening may result
in needle blocakge
Replace septum after
5-10 injections.To replace
septum, turn retainer counter-
clockwise. For replacement
septa order Teflon bonded to
Silcone, diameter = .375" (9.5 mm)