Operation
9
3.2 Time Delay Control
The time delay adjustment is located on top of the
instrument, as shown in Figure 3-1. It is used to help stop
an oscillating relay output due to agitation or waves in the
vessel.
CAUTION:
THIS adjustment is a 270º (¾ turn) potentiometer. Do
not turn it beyond its mechanical stops or damage to
unit may occur.
The unit is shipped with the Time Delay set to zero (0)
seconds. Using a small screwdriver, turn the adjustment
clockwise to set anywhere from 0 to 60 seconds.
Section 3: Operation
This section describes the operating switches of the Z-tron
III level control. Remove the dome lid and use a small
screwdriver to set the operating controls.
3.1 Setpoint Control
There is a single operating point adjustment used to control
the level at which the relay operates. See Figures 2-8 & 3-1.
This adjustment is an 20-turn potentiometer and does
not have a mechanical stop. When in High Level Fail
Safe condition, if light (LED) is ON - turn CCW to find
SP (relay changes state w/click & light turns OFF)...
turn CW if light is initially OFF. Opposite is true in
Low Level Fail Safe.
• Turning the setpoint adjustment clockwise (CW) raises
the level at which the relay operates.
• Turning the setpoint counterclockwise (CCW) lowers the
level at which the relay operates.
• The LED (on) indicates that the relay is energized.
Figure 3-1
Z-tron III Operating Controls and LED
Setpoint
Adjustment
LED
(Alarm when
NOT illuminated)
Time Delay
Adjustment
1
2
ON
Switch 1 LEFT = Low Level Fail Safe
Switch 1 RIGHT = High Level Fail Safe
Switch 2 LEFT = Reverse Time Delay
Switch 2 RIGHT = Forward Time Delay
Hold-down Screws
