GE MOA 280i, Operation And Maintenance Manual

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GE Analytical Instruments ©2006 DLM 14291 Rev. A
6-6
A C C E P T N E W R E S P O N S E S
O L D P P M 0 . 1 2 2 4
N E W P P M 0 . 1 2 1 8 .
O L D P P B 0 . 2 4 4 2
N E W P P B 0 . 2 4 3 5
E N T a c c e p t C L R r e c e c t
A C C E P T N E W R E S P O N S E S
O L D P P M 0 . 1 2 1 8
N E W P P M 0 . 1 2 1 5 .
O L D P P B 0 . 2 4 3 5
N E W P P B 0 . 2 4 3 1
E N T a c c e p t C L R r e c e c t
B o t h r e s p o n s e s o u t o f
r e c o m m e n d e d l i m i t
E N T p r o c e e d C L R e s c
A C C E P T N E W R E S P O N S E S
O L D P P M 0 . 1 2 1 5
N E W P P M 0 . 2 3 9 0
O L D P P B 0 . 2 4 3 1
N E W P P B 0 . 4 7 8 1
E N T a c c e p t C L R r e c e c t
•
Use the arrow buttons to scroll to the value of the first digit of the
concentration and press ENTER to save this digit and move the cursor. Press
CLEAR to delete an incorrect value.
•
Use the arrow buttons to scroll to the value of the second digit and press
ENTER to save this value.
•
Continue entering the digits or a decimal place until the concentration of
the calibration gas is entered. Press ENTER to accept the concentration.
•
The menu will change to indicate that the concentration value was
accepted and then will display the concentration and units.
•
Press ENTER to accept the concentration. Press CLEAR to reject the
concentration and return to the Calibrations Menu.
•
Select PPM&PPB to calibrate both ranges and press ENTER to start the
calibration.
The display changes and shows the moving average for the PMT signal in millivolts,
starting at zero. The firmware waits until the signal stabilizes and then calculates
the PPM response based on the final PMT signal and the concentration of the
calibration gas. The NOA is set at the factory to have a response of 2 mV/ppm. For
a 45 ppm calibration gas, the final PMT signal should be ~ 90 mV. The NOA then
calculates the response for the PPB range based on the new PPM calibration.
•
The new PPM and PPB response factors (ppm/ADC counts and ppb/ADC counts)
are then displayed. Press ENTER to save the new response factors.
•
Two or three successive gas calibrations should be performed to make sure that the
calibration is not drifting up or down. Replicate gas calibrations should agree at the
third decimal place. If the calibrations are drifting, continue sampling the
calibration gas until stable replicate calibrations are obtained.
Calibration Gas Warnings