Proportional Control Programming - Crison MultiMeter 44 Manual Del Usuario

Operation
Figure 26 Example of ON/OFF control for a pH channel

4.13.2 Proportional control programming

50
4 5
Limit 1: On pH 6, Off pH 6.5
Limit 2: On pH 8, Off pH 7.5
The proportional control is divided in 3 zones:
Tolerance zone.
Corresponds to the accepted reading. The relays do not activate.
Control band.
This is the zone where the control is carried out. The relay will be activated during time
(tON) proportional to the distance between the reading and the control band. The rest of
time the relay will be deactivated (tOFF). tcycle= tON + tOFF.
Alarm zone.
If the programming is Alarm: YES. Once the programmed time has over, the alarm relay
will activate and the limit relay will deactivate.
If the programming is Alarm: NO, the limit relay is activated permanently in this zone. This
is the situation appearing on the example
1. From the main menu select
2. Select the channel to program and confirm.
3. Select
CONTROL WITH RELAYS
4. Select
PROPORTIONAL, 1 LIMIT
5. Enter the control values using the keypad.
Optimal v.: optimal value.
•
Toler.: value for the tolerance zone.
•
C.Band: value for the control band.
•
Cycle T.: value for the cycle time.
•
6. Select to accept the data.
CONTINUE
6 7 8 9
6.5 7.5
(Figure
SYSTEM > PROGRAM CHANNEL
and confirm.
or
PROPORTIONAL, 2 LIMIT
pH
27).
. Confirm.
and confirm.