Background Correct; Table 4-1. Gas Concentration Units - Thermo Scientific TVA2020 Instruction Manual

Calibration
Calibration Configuration

Background Correct

4-6 TVA2020 Instruction Manual
FID
Enter span conc:
FID: 500ppm
Up/Dn=Next unit
Enter=Accept
Use the up and down arrow keys to select the measurement units (ppm or
%) and the decimal point position. There are 3 selections to choose from:
Table 4–1. Gas Concentration Units
Range
3
2
1
The range of the instrument is determined by your selection of
measurement units and decimal point placement. In the run mode, the
instrument will auto range upward only to select the optimum range for
displaying measurement information. For example, if you entered a value
in Range 1 and the measured value changes to a high value, the instrument
will automatically switch to range 2. If it increases further, it will switch to
Range 3.
After you have selected the measurement units and decimal point
placement, use the keypad to enter the concentration value. Press ENTER
to accept this value and store it in the TVA's memory.
3. If your TVA2020 is a dual detector analyzer, you may repeat the
procedure for the second detector. If your TVA2020 is configured for
more than one span point, you may use the Up/Dn arrow keys to select
the next span point and repeat the procedure.
4. When the last gas concentration value has been entered, you can return
to the CALIBRATION menu, by pressing the EXIT key.
This selection allows you to choose whether or not to apply background
correction to the detector readings displayed and logged in memory. If you
choose to apply background correction, the last background reading stored
in memory will be subtracted from the measured reading. This corrected
PID/FID
Enter span conc:
P&F: 100.0ppm
Up/Dn=Next unit
Enter=Accept
Display
DD.DD
DDDDDD
DDDD.D
Units
%
ppm
ppm
Thermo Fisher Scientific