24
7.3
Contact water meter
For the proportional production of the chlorine dioxide the connection of a contact water meter is required.
The LOTUS-controller can work with the following types of water meters:
•
Contact water meter with Reed-contact (like type CTFI)
•
Contact water meter with open collector
•
Water meter with analog output 4
…
20 mA (like a magnetic flow meter)
In the sub-menu
„Water Meter“
LOTUS can be optimal adapted to the connected water meter.
Enter the main menu and open the sub-menu
“Water Meter”
.
Dimension:
Select the dimension you want to insert in field
“Value”
. Chose between pulse per liter
„Imp./Ltr.“
,
or liter per pulse
„Ltr./Imp.“
.
Value:
Insert the pulse spacing (see also chapter 4.4.1).
Max. Value:
This input is only for water meters with analog output (0/4
…
20 mA). You have to insert the max-
imum flow of the water meter in m
³
/h corresponding to 20 mA.
Resolution:
Here you have to select the type of analog output of the water meter. You can chose „0/20 mA“
or „4/20 mA“.
Notice:
This function is activated only in case the option
“Analog”
was ordered.
Timeout:
The
“Timeout”
function acts as an optimizer for the proportional mode in case a contact water
meter is connected to LOTUS and
a) The flow is fluctuating very strong in short periods
b) The pulse spacing of the water meter is extreme inconvenient.
The range is between 0 – 20 seconds.
“0”
deactivates the function.
What is the principle?
As soon as the first pulse from the water meter is noticed, Lotus starts the production with 100%
capacity (= maximum stroke frequency). Parallel the controller is counting the time until the next
pulse appears. With this information LOTUS can calculate the flow and the required production
capacity to readjust the stroke frequency for the pumps.
In case the water meter produces more pulses than LOTUS is able to produce chlorine dioxide
proportional to the flow (failure message
“OVERFLOW”
), the controller buffers the pulses and
execute them later. But only for the timeout span to avoid overdosing in case the water flow
stops immediately during the timeout.
Water Meter
Dimension:
Imp/Ltr
Value:
0004.0
Max. Value: 05000.0
Resolution:
4/20 mA
ESC
Imp./Ltr.
Water Meter
Timeout:
ESC
05
Main Menu
Pumps
Probes
Water Meter
Water meter configuration
Water Meter
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