Function
Alarm
level : - in high alarm, the function goes on when the level rises
to the ON setpoint and goes off when the level lowers to
the OFF setpoint. In low alarm, the function goes on
when the level lowers to the ON setpoint and goes off
when the level rises to the OFF setpoint.
in bounds : - the relay will be in alarm if the level is inside the zone
between the setpoints.
out of bounds : - the relay will be in alarm if the level is outside the
zone between the setpoints.
differential : - the high alarm function goes on when differential
level increases to the ON setpoint and goes off when the
differential level decreases to OFF setpoint. The low alarm
function goes on when the differential level decreases
to the ON setpoint and goes off when the differential level
increases to the OFF setpoint.
rate of change : - in filling alarm, the function goes on when the rate of filling
increases to the ON setpoint and goes off when the rate of filling
drops to the OFF setpoint. In emptying alarm, the function goes
on when the rate of emptying increases to the ON setpoint and
goes OFF when the rate of emptying drops to the OFF setpoint.
For emptying alarm, the setpoints must be entered as
negative values.
temperature : - in high alarm, the function goes on when the temperature rises to
the ON setpoint and goes off when the temperature lowers to the
OFF setpoint. In low alarm, the function goes on when the
temperature lowers to the ON setpoint and goes off when the
temperature rises to the OFF setpoint.
loss of echo : - the function goes on when the fail-safe timer expires. The function
goes OFF when a valid echo is received (fail-safe timer is reset).
PL-443 5 – 5
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