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If No, change the cut-in or turn-on pressure of the nitrogen generator to be 3-5 psig (.2-.3 bar) below
operating pressure of the fire sprinkler systems’ air maintenance device(s) using the Nitrogen Generator
Pressure Adjustment Procedure (section 6.g.) in the Maintenance Section.
Verify and document that the cut-in or turn-on pressure of the nitrogen generator
is above the low air alarm pressure of the fire sprinkler system(s): Yes No
Verify and document the cut-in or turn-on pressure of the nitrogen generator: ______________________
Verify and document the cut-out or turn-off pressure of the nitrogen generator is
above operating pressure of the fire sprinkler systems’ air maintenance device(s): Yes No
If No, change the cut-out or turn-off pressure of the nitrogen generator to be above operating pressure
of the fire sprinkler systems’ air maintenance device(s) and below 85 psig (5.9 bar) using the Nitrogen
Generator Pressure Adjustment Procedure (section 6.g.) in the Maintenance Section.
Verify and document the cut-out or turn-off pressure of the nitrogen generator: _____________________
Verify and document that the bypass/nitrogen generation valve is operating properly: Yes No
Verify and document the nitrogen back pressure regulator is set to 80 psig (5.5 bar): Yes No
Change if needed. Document regulator setting: ________________________________
Open the isolation ball valve to the internal flow meter.
Connect the handheld gas analyzer (PHGA-1) to the gas sampling port of the nitrogen generator.
Allow the nitrogen generator to operate in nitrogen production mode for approximately five (5) minutes
to ensure proper operating temperature of the nitrogen generator prior to adjusting nitrogen purity or
measuring nitrogen production rate.
NOTE: The nitrogen generator will obtain optimum operating temperature faster if the nitrogen
generator cabinet door is closed.
Adjust to Flow Control Valve in the nitrogen generator to obtain a nitrogen output purity level of 98%.
NOTE: Nitrogen purity and nitrogen production rate are inversely proportional in the nitrogen generator.
As nitrogen purity increases, production decreases. Increase nitrogen purity by turning Flow
Control Valve clockwise and decrease nitrogen purity by turning Flow Control Valve
counterclockwise.
Verify and document the nitrogen output purity concentration: __________________
Verify and document the nitrogen production rate as indicated on the flow meter: __________________
Compare documented nitrogen output purity concentration and nitrogen production rate levels with the
Shop Test Report provided in the nitrogen generator.
1. Readjust nitrogen output purity level using Flow Control Valve, as necessary, to obtain nitrogen
output purity levels and nitrogen production rate comparable to the Shop Test Report, if
discrepancies are significant.
2. If unable to obtain comparable nitrogen output purity levels and nitrogen production rate, contact
ECS.
Close the isolation ball valve to the internal flow meter.
Disconnect the handheld gas analyzer (PHGA-1) from the gas sampling port of the nitrogen generator.
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