14
(1) ...... Press
to view Alarm settings.
(2) ...... Press
or
to program Alarm Point 1 (low alarm).
(pump B)
(3) ...... Press
again to save settings and to advance to next
Alarm set point.
(4) ...... Press
or
to program Alarm Point 2 (high alarm).
(pump A)
(5) ...... Press
again to save data and to advance to hyster-
esis setting.
(6) ...... Press
or
to program Alarm Hysteresis value. This
is the point where the alarm turns off.
If the 4-20 mA option board is installed, the following screens will
appear. If these do not appear and the 4-20 mA PCB is installed,
go to Section 4.6, Advanced Menu, and program option “7” to “1”
and option “6” to “1”.
(7) ...... Press
again to display current mA value.
It is highly recommended that the hysteresis (pump off function) be used to prevent relay chatter.
The function of the hysteresis is to prevent pump relay chattering. It operates by allowing the pump to be turned on when
the control point plus (or minus) the hysteresis value has been met, but does not allow the pump to turn off until the control
point has been met. The chosen value will be used for both upper and lower set points.
The hysteresis, or dead band, designates how many ORP units beyond set point the pump runs before turning off. Any value
from 0 to 100 mV is acceptable. If use of this function is undesirable, set it to 0.
4.3
Alarms