Gow-Mac 580 series, Operating Manual

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GOW-MAC Instrument Co. 32
Chart 5-5
Argon
0
0
100
100
200 300
Cell Temperature (°C)
Bridge Current (mA)
Nitrogen
275
Maximum
Dual TCD
WX7 Filaments
c. Adjust the COLUMN TEMPERATURE CONTROL to desired setting.
d. Adjust the DETECTOR TEMPERATURE CONTROL to desired setting.
e. Adjust the INJECTION PORT TEMPERATURE CONTROL to desired setting.
f. Turn the CURRENT CONTROL to 100 mA.
NOTE
)
If bridge current does not respond, check carrier gas pressure.
Filament protector pressure switch (internal) must have at least 15
psig to operate. Set at 40 psig.
After approximately 45 - 60 minutes, the instrument should be up to temperature and ready
for the injection of samples.
C. Strip Chart Recorder Zeroing
The Series 580 GC is suitable for use with almost any strip chart recorder of the potentiometric
type (1 mV, 10 mV, or other. For best results and maximum sensitivity, the GOW-MAC Model
70-150A 1 mV Recorder is recommended. An adjustable chart drive is also recommended: 40,
20, 10, 4, 2, and 1 cm/min. and hour.
After the recorder is properly connected to the instrument, it may be turned “ON”. At this time the
electrical zero on recorder should be established. Proceed as follows:
1. Set the GC ATTENUATOR to the infi nity position (

).
2. Adjust RECORDER ZERO to move the pen to the desired baseline position (usually set at 5
or 10 small divisions on the chart paper). Where positive and negative peaks are expected,
pen may be set mid-scale. If pen response is slow, the recorder may require adjustment (see
recorder manual).
3. Set GC ATTENUATOR to “64”. Adjust the GC ZERO CONTROL to reposition the pen to the
same spot located in Step 2. The polarity should be set so that the drift due to warm- up is
upscale. In this manner, the extent of drift and the leveling out of the baseline may be
observed.