Emec LOTUS MINI, Руководство по эксплуатации

Страница: 44 / 72

12
General information:
Warning:
In accordance to DIN 1988 a system separator is required in the main building feed line.
Notice:
•
Take equal pipe dimensions and connections for the contact water meter and the intermixture
device to ensure optimal hydraulic conditions.
•
Take absolute care for the maximum permitted operation pressure (see label on the LOTUS)!
Contact water meter [ 23 ]
Warning:
Between the contact water meter and the point of injection no possibility for tapping water
is allowed. Otherwise it can happen that the chlorine dioxide concentration can rise undue.
The LOTUS – controller is able to work with the following signals:
•
Contact water meter with Reed-contact (like type CTFI)
•
Contact water meter with open collector
•
Water meter with analog output 4 … 20 mA
The water meter has to be placed after the system separator [ 22 ] and before the point of injection [ 24 ]. He
must gather the complete amount of water which has to be injected with chlorine dioxide.
Use the following formula for the calculation of the optimal contact water meter to achieve a continuous dosing
of chlorine dioxide without producing „clouds“:
Pulse spacing ≤ [ Pulse/Liter ] ≤
F = Factor based on the nominal size of the contact water meter:
DN 15 = 2
DN 20 = 2
DN 25 = 4
DN 32 = 7
DN 40 = 15
DN 50 = 20
Example 1:
In a well water supply with a nominal size of DN 20 a chlorine dioxide concentration of 0.1 mg/l is required:
Pulse spacing = = 5 Selection: Contact water meter type CTFI 20 – ¾ “ with 4 pulse/liter
Example 2:
In a well water supply with a nominal size of DN 50 a chlorine dioxide concentration of 0.1 mg/l is required:
Pulse spacing = = 0.5 Selection: Contact water meter type CTFI 50 – 2“ with 1 pulse/ 2 liter
Notice:
Find more information in chapter “7.5.1 Proportional Mode” .
1
F x [ mg/l ]
1
2 x 0.1 mg/l
1
20 x 0.1 mg/l
1
F x ClO
2
– desired concentration