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Gauge Calibration
Procedure
4-2
SGD-O User Guide
4. To determine the water/air ratio, first standardize the gauge with pipe
full of air using (DAC 121). When finished, fill the pipe full of water
and allow the detector to stabilize for approximately five minutes.
5. Calibrate the gauge with pipe full of water (DAC 4). This will result in
the second half of the water/air ratio. When finished, leave the pipe full
of water.
6. Recall the water/air ratio (DAC 118003). The water/air ratio is used to
obtain the calibration factor in the next step. Based on the setting of
9.6 Vdc on air and the pipe ID, the ratio should be close to the ones
listed in the table below.
Figure 4–1. Pipe IDs and water/air ratios
Pipe ID
2"
3"
4"
Note If the ratio is not near the one shown for your pipe ID, then an
error occurred. Stop the calibration process and start again.
7. Refer to
Appendix
ID. Using the pipe ID and the water/air ratio, locate the factor and
record it. The calibration factor is used to calculate the ZnCl (zinc
chloride) value used to obtain the slope correction for a 2-point
calibration curve.
Note If your ratio is between 0.98 and 1.00, there was either air or
water in the pipe for both the standardization and calibration cycles. If
this is the case, stop the calibration process and start again.
8. Clear the "Cal Point Pending" message (DAC 49). When you return to
the main screen, the alarm will still be displayed. Press the EXIT
SETUP key twice to clear the alarm.
9. Reset the CAL/REF ratio to the default value of 1.000 (DAC 086003).
10. Standardize the gauge on water (DAC 121). This will set the
standardization value (water value) that will be used to calculate the
ZnCl calibration value.
Ratio
Pipe ID
0.75
6"
0.625
8"
0.5
10"
C. There are four calibration tables grouped by pipe
Ratio
0.375
0.25
0.125
Thermo Fisher Scientific
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