21
502-3000 Series Ztron
TM
Point Level Control
Operation
3.2 Time Delay
Control
(optional)
The time delay adjustment (available as an option 402-3
X
02)
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.
NOTE
This adjustment is a 270º (¾ turn) potentiom-
eter. Do not turn it beyond its mechanical stops
or damage to unit may occur.
Using a small screwdriver and turning in the clockwise direc-
tion, the time delay adjustment is set from 0 to 90
seconds.
• The delay applies only to recovery from the alarm
condition.
• With High Level Failsafe, the delay will be effective
only on falling level. The output will indicate high level
as long as waves continue to touch the sensing element.
The unit will stop indicating high level only after the
delay time has passed, with no further contact between
the sensing element and the material being measured.
• With low level failsafe, the relay will not change state when
level is rising until the timer has timed out.
