15
NITROGEN GENERATORS
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
6. Allow the system to reach equilibrium at the desired flow rate, pressure, and purity parame-
ters. This should take approximately 15 minutes. Vent substandard nitrogen if necessary
(see Figure 4).
7.. Check the purity readings on the oxygen analyzer on a routine basis. If nitrogen purity falls
below the desired level, check the calibration of the oxygen analyzer, and readjust the flow
control valve until the proper nitrogen purity level is reached.
(Note: If more than minor
adjustments of the flow control valve are required to reach the desired purity level,
please see the Troubleshooting section of this manual for further guidance.)
9.2 Elevated Pressure Applications (>10 psig)
If the Nitrogen Generator is being used to deliver nitrogen at an elevated pressure (>10 psig/0.7
barg), use the following procedure for start-up and adjustment of the system.
(Note: In elevated
pressure applications, the customer should install a flow controller downstream from the
application, as detailed in the Installation section of this manual.)
1. Open the (customer installed) inlet air gate valve.
2. Adjust the (customer installed) inlet air pressure regulator until the Operating Pressure
gauge (see Figure 1) shows the pressure required to deliver nitrogen at the desired flow rate
(per flowmeter adjustment label.)
3. Turn the flow control valve to its fully open position.
4. Set the Outlet Pressure Regulator (see Figure 1) to the desired outlet nitrogen pressure.
5. Consult the Nitrogen Purity Label on the control panel of the generator to determine the
proper dimensionless flow meter setting necessary to achieve the desired nitrogen flow. Adjust
the (customer installed) flow controller until the dimensionless flowmeter shows the correct
reading (based on the label).
6. Allow the system to reach equilibrium at the desired flow rate, pressure, and purity parame-
ters. This should take approximately 15 minutes. Vent substandard nitrogen if necessary (see
Figure 4).
7. Check the nitrogen purity readings using an oxygen analyzer for a critical process. If nitrogen
purity falls below the desired level, check the calibration of the Oxygen Analyzer, and readjust
the (customer installed) downstream flow controller until the proper nitrogen purity level is
reached.
(Note: If more than minor adjustments of the downstream flow controller are
required to reach the desired purity level, please see the Troubleshooting section of this
manual for further guidance.)
