Recalibration - Ametek Drexelbrook Z-tron Level Control 502-302X Series Installation And Operating Instructions Manual

502-302 Series Z-tron
X

4.5 Recalibration

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TM Level Control
If the amount of preloading was recorded at the time of
initial calibration, it is possible to replace the instrument
or check calibration without moving tank level.
—Recalibration of Horizontal Sensing Elements
a. Begin with level well below the end of the sensing
element. See Figure 4-3.
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 (tune point in
air.
d. Turn the adjustment further clockwise (CW) the
amount of preload recorded in section 4.2, see NOTE.
—Recalibration of Vertical Sensing Elements
a. Turn the adjustment clockwise (CW), from the full
CCW position, the amount of preload recorded in
section 4.3(b).
17
Calibration