Calibration Of Horizontal Sensing Elements - Ametek Drexelbrook Z-tron Level Control 502-302X Series Installation And Operating Instructions Manual

502-302 Series Z-tron Level Control
X
4.2 Calibration of
Horizontal Sensing
Elements
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All calibrations must be performed with the
sensing element permanently installed in a
tank. Calibration cannot be performed out-
side of the tank or in a bucket of material.
This is because the RF energy seeks the
nearest metal object and uses the tank wall
as a return path to the electronic chassis.
Do not turn any adjustment past its mechanical
stops. Damage to the unit could occur.
•Use the insulated calibration tool (part number 290-1-1).
See Figure 4-1.
•LED lit (on) indicates that the relay is energized, or in
the normal condition (not alarm).
—Horizontal Calibration
a. Begin with level well below the end of the sensing
element.
b. Using the insulated tool supplied with the unit,
turn the setpoint adjustment to the full counterclock-
wise (CCW) position.
c. Turn the adjustment slowly clockwise (CW) until the
relay just operates. LED changes states. This is the
tune point in air.
d. Mentally note the position of the adjustment tool
pointer when at the tune point in air.
12
Calibration
NOTE
WARNING