Grundfos Conex DIA-G Montage- Und Betriebsanleitung Seite 42

11.9.2 Setting limit values for the sensors
Main menu > Sensor 1 (Sensor 2)
Submenu 1 Submenu 2
Limit value 1
Limit value
Limit value 2
Hysteresis
The menu structure for sensor 1 and sensor 2 is
identical.
In the "Limit values" menu, two limit values per
sensor can be entered within the sensor measuring
range. When these limit values are reached, the limit
value relay is activated and an alarm is triggered, if
applicable.
If limit value 2 is exceeded by one of the two
sensors, a sprinkling installation is usually triggered
to bond the leaking chlorine.
To prevent the immediate triggering of alarm
measures when the value is exceeded only briefly, a
delay time can be entered. When limit value 2 is
exceeded, the relay for limit value 2 is only activated
once this delay time has elapsed.
The alarm delay time begins when the measured
value for a sensor exceeds its value for limit value 2.
Other settings for limit values (switching direction,
confirmation, alarms) are made in the "Setup" menu.
See section 11.8.4 Setting the function of the limit
value relay for the sensors.
Defining limit values
In the "Limit values" submenu, the limit values can
be set within the measuring range.
• Limit value 1 or 2
– Off
– On.
• Limit value 1 or 2
– x.xx ppm.
For limit value 2, a delay from 0 to 180 seconds can
be set (default is 60 seconds).
• Limit value 2
– xxx sec delay.
42
Submenu 3 Submenu 4
Off
On x.xx ppm
Off
On x.xx ppm
x.xx ppm hysteresis
Setting the switching hysteresis
A hysteresis can be set for the limit values of each
sensor (the sensors are set separately, but the
hysteresis of the two limit values of one sensor is
equal) to prevent constant switching when the limit
value is reached.
In the "Limit values" submenu, a hysteresis can be
set.
• Hysteresis
– x.xx ppm.
• Setting range: 0-50 % of measuring range.
Example: Limit value 3.00 ppm, hysteresis 0.04 ppm
– The hysteresis band is symmetrical around the
switching point.
– Point of switch on = limit value + 1/2 hysteresis
– Point of switch off = limit value - 1/2 hysteresis.
ppm
3 02 ppm
.
3 00 ppm
.
2 98 ppm
.
1
0
Fig. 15 Switching hysteresis
Submenu 5
xxx sec delay
t