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2000 Fire Door-Fan Manual updated 2002-05-28 Page 26 of 58
Digital Gauge Readings
Model DM-1 Digital Gauge for models N64, N63, L64, L63, J64, J63
1. Connect the 3 inch red tube from the Console or
Digital Control Panel to the right port of the DM-1.
Tips
Re-Zero … prior to taking a new set of readings.
Changes in temperature or position may affect the zero by 0.1 to 0.4 Pa but overall the drift
will be minor. It is best not to re-zero before a test is completed. Take readings for both
pressurize and depressurize without re-zeroing the DM-1. Small changes in zero are offset
by testing in both directions.
Time Averaging
Experiment with one-second time averaging for stable pressure conditions and longer
averages for windy conditions.