Page 55 - NG-1 100, NG-1 250, NG-1 500 - Wall-Mounted Nitrogen Generator System Installation Manual
P. 55

1. Power On the THGA by depressing the power on button.
2. Calibrate the THGA by depressing and holding the calibration button for three (3) seconds until
“CAL” is displayed.
NOTE: To calibrate analyzer, unscrew sampling hose from analyzer and move back and forth until reading is displayed.
a. THGA must be recalibrated if nitrogen percentage displayed is above 80.1% or below 78.1% when reading normal atmosphere, not connected to the nitrogen generator cabinet or vent.
b. Recommended to recalibrate analyzer daily when in use.
3. Once the THGA is calibrated, insert the quick disconnect of the sampling hose into the sampling port in the nitrogen generator cabinet/vent.
NOTE: Nitrogen generator must be operating in “nitrogen production mode” to sample nitrogen in cabinet. Vent must be open to sprinkler system pressure to sample nitrogen in sprinkler system.
4. Allow one (1) minute for the THGA to stabilize, verify and document reading on THGA (nitrogen level should be approximately 98%). If nitrogen level from generator is below 96%, contact Johnson Controls.
 Sampling Hose
Calibration Button
     Power On Button
 Quick Disconnect
 Handheld Gas Analyzer - Factors Influencing Accurate Readings
1. Elevation changes will affect the accuracy of the nitrogen purity readings. The deviation of the nitrogen purity can be approximately 1% per 250 feet of elevation.
a. Calibration of the instrument should be performed when elevation at which the product used changes more than 500 feet.
2. Temperature effects the accuracy of the nitrogen purity readings. The gas analyzer will hold calibration and correctly read nitrogen purity ±3% when thermal equilibrium within the operating temperature range. The device must be thermally stable when calibrated and allowed to thermally stabilize after experiencing temperature changes before readings are accurate.
TFP1273 Page 54 of 80

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