Thermo Scientific 43i, Инструкция по эксплуатации

Страница: 126 / 312

Calibration
Multi-Point Calibration
4-6 Model 43i Trace Level-Enhanced Instruction Manual Thermo Fisher Scientific
0.5 LPM. Actual zero air flow should be 0.8 LPM or more, with the
excess flowing out the atmospheric bypass.
a. From the Run screen, press to display the Main Menu.
b. From the Main Menu, choose Diagnostics > Flow to display the
Sample Flow screen.
c. Make sure that the reported sample flow is less than the actual zero
air flow.
3. Monitor the zero air reading and wait for the reading to stabilize.
4. From the Main Menu, choose Calibration to display the Calibration
menu.
5. At the Calibration menu, press to display the SO
2
Background
screen, after 10 minutes of zero air and when the reading is stable, press
to set the SO
2
reading to zero.
The display flashes the message “SAVING”, and the SO
2
reading is
added to the background correction. Record the stable zero air reading
as Z
SO2
.
6. Press to return to the Calibration menu.
7. Connect a source of calibration gas to the SAMPLE bulkhead. The
calibration gas concentration should be approximately 80% of the full-
scale range.
8. To ensure that the calibration gas is being measured at atmospheric
pressure, check that the sample flow in the analyzer is approximately
0.5 LPM. Actual sample air flow should be 0.8 LPM or more, with the
excess flowing out the atmospheric bypass.
9. Sample the vented calibration gas and wait for the instrument reading
to stabilize.
10. Press to move the cursor to Cal SO
2
Coefficient, and press
to display the Calibrate SO
2
screen.
The first line of the display shows the current SO
2
reading. The SPAN
CONC line of the display is where you enter the calibration gas
concentration.