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

502-302 Series Z-tron
X
3.2.2 Time Delay
Control
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TM Level Control
The optional time delay adjustment is located on top of the
instrument, across from the setpoint adjustment (Figure 3-
2). It is used to help stop an oscillating relay output due to
agitation or frothing in the vessel.
•The standard time delay is 0-90 seconds.
•The delay applies only to recovery from the alarm condi-
tion.
•On a High Level Failsafe unit, 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.
•Calibration of a Z-tron with time delay is explained in
paragraph 4.5.

Time Delay Control

9
Figure 3-2
Operation