lev-co 13-12, User Manual

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7.3 Pressure Sensor Setup
The A1 pressure sensor has four buttons located on the face of the gauge for set-up and calibration.
These are Span, Zero, Units, and Lock. The Units button changes the unit of measure – set this for inch-
es wc. The Lock button locks and unlocks the keypad on the gauge. Span and Zero are used for calibra-
tion (see below). Simultaneously pressing the span and zero buttons for 3 seconds switches the unit
from internally sourcing the power for the current loop (factory default) to requiring an external power
supply. The power source should be left in internal (factory default) mode. See below for the front
panel layout.
Periodically, it may be necessary to re-zero the gauge to maintain the accuracy of the sensor. To do this,
remove the pressure connection from the LOW port and hold the “zero” button for 3 seconds. Span is
not normally adjusted or modified.
Figure 11 - Pressure Gauge Front Panel
7.4 VFD Setup
This is identical to a standard system – see above.