Operating
7.3 Relays
HydroRanger 200 HMI
96 Operating Instructions, 06/2018, A5E36281317-AC
Each relay on the device can be programmed for a wide range of functions according to your
application needs. The available function categories are Alarms, Pumps, Totalizing and
Sampling, and Miscellaneous.
If the ON setpoint is higher than the OFF setpoint, the relay operates as:
● High alarm
● Pump down control
If the ON setpoint is lower than the OFF setpoint, the relay operates as:
● Low alarm
● Pump up control
The ON and OFF setpoints can not be the same on an individual relay but may be common
to other relays. The dead band or hysteresis is the difference between the ON and OFF
setpoints. For in and out of bounds level alarms, the hysteresis is set at ± 2 % of span from
either boundary.
Level In high alarm, the alarm is activated when the level rises to the ON setpoint and
turns off when the level lowers to the OFF setpoint. In low alarm, the alarm is
activated when the level lowers to the ON setpoint and turns off when the level
rises to the OFF setpoint.
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.
Rate of change The filling alarm
when the rate of filling increases to the ON setpoint
and
when the rate of filling drops to the OFF setpoint.
The emptying alarm
when the rate of emptying increases to the ON
setpoint and
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 set-
point 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 starts when the fail-safe timer expires. The function stops when a
valid echo is received (fail-safe timer is reset).
Cable fault The alarm is activated when a transducer cable is not connected properly
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