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3. Press G, P, V or F to exit calculate mode. If the memory is full (99
samples have been stored), more samples cannot be stored. If the user attempts to
store another sample, the Meter flashes "Full" and does not save new readings.
Measuring Differential Pressure
To measure differential pressure, do the following, see Figure 3:
1. Press P to enter the pressure mode.
2. Connect a single hose to the "Input (+)" port, leaving the "Ref (-)" port unconnected.
3. With the tubing open to ambient conditions press and hold Z for 2 seconds.
4. Place the input hose in a different zone than the Meter.
5. The Meter displays the differential pressure of the input zone with respect to the
reference zone. For instance, a positive reading means that the input zone is positively
pressured with respect to the Meter location or its reference zone.