Thermo Scientific TVA2020, Instruction Manual

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Calibration
Calibration Scenarios
4-2 TVA2020 Instruction Manual Thermo Fisher Scientific
If, instead, you want to measure in direct readings (response factor = 1) for
one specific compound with maximum accuracy over a wide range of
concentrations, perform a multipoint calibration with the specific
compound. Up to 9 span points (plus zero) can be entered for each
detector. The use of a response curve is thus unnecessary as the detector is
already reading the direct ppm for that specific compound.
CAUTION If you use multipoint calibration or a gas other than methane or
isobutylene and then apply response factors/curves (that have been
generated with reference to a single point methane/isobutylene calibration),
the resulting measurements will probably be incorrect.
▲
To provide the specified accuracy, the instrument must be calibrated at the
beginning of each workday.
●
From the Main Menu, choose 2 = Setup > 1 = Calib .
When you reach the CALIBRATION menu, you will see the following
selections:
CALIB MENU
1=Zero 2=Span
3=Backgnd 4=RF
5=Flow 6=Cfg
The steps involved in calibrating the TVA2020 are as follows:
1. Configure the calibration variables (6=Cfg):
●
Number or span points (1-9)
●
Span concentration
●
Background correction (None, PID, FID, Both)
●
Response factor calculation mode (Multiplication factor or Curve)
●
Accept mode (Manual or Auto)
●
Save mode (Manual or Auto)
2. Zero the instrument using either a zero gas or clean ambient air
(1=Zero).
Scenario 3