Series 5900 DID GC
1019, Rev. 1
23
F. Gain Adjust
1. The gain is set after selecting the range as this is the DID signal
amplification. Set the gain by pressing the Gain Adjust box and entering
a number of 1 through 4 on the pop-up keypad. The code is shown in
the table below.
Set Number
Gain
1
1
2
10
3
100
4
1000
G. DID Zero: The actual DID signal appears in the window on the top
right (DID SIG). Press the DID ZERO button to zero the baseline signal.
The instrument may require multiple attempts to bring the baseline to
~0.00VDC.
H. Offset Baseline: To change the set point, press the Offset Baseline box
and enter the desired offset on the pop-up keypad. The value must be keyed
in and ENTER must be pressed, followed by OK to exit the keypad. To set a
negative offset, press “-“ sign then key in the number using the keypad. The
offset range is -6.25 V to +6.25 V.
I. Data Acquisition: The SERIES 5900 GC may be used with data handling
PC software. After the software is properly installed and connected to the
instrument, the software may be turned ON. Reference should be made to the
software operating manual.
5.3 Calibration
A. After allowing for sufficient time for the SERIES 5900 DID GC to equilibrate
and the operating parameters are rechecked, it is recommended to
start the
RANGE at R4 and GAIN at 2
to begin calibration and adjustment of
the DID. As the carrier gas and DID clean up and are free of any air
contaminants, the sensitivity will increase and Range and Gain can be set for
the requirement of the analysis.
B. It is necessary to purge the SAMPLE LOOP for a sufficient time to remove
all traces of room air and old sample. This may take 5 to 10 minutes at a
flow rate of 50 to 100 mL/min, especially if you have change sample sources.
NOTE
THERE MAY BE RESIDUAL AIR TRAPPED IN THE SAMPLE REGULATOR
BOURDON TUBES WHICH MUST ALSO BE PURGED TO GIVE CONSISTENT
RESULTS AT LOW LEVELS.
Содержание 5900 Series
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