GE Analytical Instruments ©2006 DLM 14291 Rev. A
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restrictors that provide a lower flow into the analyzer are available. Table I lists
the restrictors available from Sievers Instruments.
Table I. Available Flow Restrictors
Part No. Flow Rate (mL/min)* Cell Pressure (torr) Color Code
HMI 14140 100 5.5 Black
HMI 14120 55 4.0 Blue
HMI 14110 30 3.2 Red
HMI 14100 10 2.5 Green
* - flow rates into NOA at atmospheric pressure of 630 torr
To use the NOA at a lower flow rate, remove the standard flow restrictor. Install
the new flow restrictor and recalibrate the NOA at the lower flow rate.
Calibration at Lower Flow Rates
Since the response of the NOA at flow rates below 200 mL/min will be lower than
with the standard flow rate, the analyzer must be recalibrated for the lower flow
rates. In most cases, high voltage for the PMT will need to be adjusted to achieve
good results. Contact Sievers Instrument for the procedure to set the high voltage
with the lower flow restrictors. If the high voltage is not adjusted, the NOA will
report a response out of recommended limits” message during calibration.
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