Section 3 - Operation; Start-Up; Controls; Setpoint Control - Ametek Drexelbrook Z-tron Level Control 502-302X Series Installation And Operating Instructions Manual

502-302 Series Z-tron Level Control
X
SECTION 3
OPERATION

3.1 Start-up

3.2 Controls

3.2.1 Setpoint
Control
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This section contains the start-up and operating informa-
tion for the Z-tron level controls (402-3020 or 402-3022).
Before applying power to the instrument, be sure that the
input power is from a 120 vac, 50/60 Hz power source. Also
check wiring connections as described in paragraphs
2.3 and 2.4.
If the Z-tron level control is placed in a hazardous
area, caution must be taken before removing the
explosionproof housing. In order to calibrate the unit,
the area must be checked and known to be non-
hazardous. When calibration is completed, the cover
must be replaced and each conduit from the
explosionproof case must be equipped with an ap-
proved seal fitting.
There is a single adjustment located on top of the instru-
ment (Figure 3-1) that controls the point at which the
relay operates.
•A lighted LED indicates that the relay is energized.
•Each revolution of the control will change the operating
point approximately 0.2 pF.
•Turning the adjustment clockwise will raise the level at
which the relay operates and turning it counterclockwise
will lower the level at which the relay operates (vertically-
mounted sensing elements only).
8
WARNING
Figure 3-1

Setpoint Control

Operation