Operation
Operating modes
31
© Lutz-Jesco GmbH 2017
Subject to technical changes.
170502
BA-10010-02-V01
Solenoid-diaphragm dosing pump
MAGDOS LA / LD
Operating instructions
Calculating the transmission factor
The first calculation phase is used to determine the transmission factor
which is set in the display of the MAGDOS LD.
The following parameters are required for this:
n
Dosing quantity per cubic metre of water in ml/m3
n
Pulse sequence of water meter in l/lmp
n
Delivery capacity per stroke of the dosing pump in ml/stroke
Calculate the factor using the following formula:
required dosing quantity per pulse x 100%
delivery capacity per stroke
1 ml/pulse x 100
0,63 ml/stroke
= 159 %
required dosing quantity x pulse sequence of water meter
delivery capacity per stroke x 10
1000 x 1
0,63 x 10
= 159 %
dosing quantity in ml/m³ x nominal size of the water meter in m³/h
delivery capacity per stroke in ml/stroke
1000 ml/m³ x 5 m³/h
0,63 ml/stroke
= 7937 strokes/h
Example:
1000 ml of a dosing medium should be dosed per m3 of water in a water
line at 4 bar. The contact-type water meter has an pulse sequence of 1 l/
pulse. The selection table (see 30) can be used to select a MAGDOS LD
6 with 0.63 ml/stroke at 4 bar. A MAGDOS LD 10 would also come into
consideration as it doses 0.88 ml/stroke. A MAGDOS LD 15 is not suitable
as it can only work at 3 bar.
The factor to be set is calculated as follows:
required dosing quantity per pulse x 100%
delivery capacity per stroke
1 ml/pulse x 100
0,63 ml/stroke
= 159 %
required dosing quantity x pulse sequence of water meter
delivery capacity per stroke x 10
1000 x 1
0,63 x 10
= 159 %
dosing quantity in ml/m³ x nominal size of the water meter in m³/h
delivery capacity per stroke in ml/stroke
1000 ml/m³ x 5 m³/h
0,63 ml/stroke
= 7937 strokes/h
Calculating the necessary stroke frequency
The second calculation phase checks the size of the contact-type water
meter and the maximum stroke frequency of the MAGDOS LD by
comparing the required stroke frequency and the maximum stroke
frequency of the dosing pump.
The following additional parameter is required for this:
n
The nominal size of the contact-type water meter in cubic metres per
hour [m³/h]
Calculate the necessary stroke frequency using the following formula:
required dosing quantity per pulse x 100%
delivery capacity per stroke
1 ml/pulse x 100
0,63 ml/stroke
= 159 %
required dosing quantity x pulse sequence of water meter
delivery capacity per stroke x 10
1000 x 1
0,63 x 10
= 159 %
dosing quantity in ml/m³ x nominal size of the water meter in m³/h
delivery capacity per stroke in ml/stroke
1000 ml/m³ x 5 m³/h
0,63 ml/stroke
= 7937 strokes/h
Example:
For the dosing specified above, a contact-type water meter with the
nominal size of m³/h should be used.
The necessary stroke frequency is calculated with:
required dosing quantity per pulse x 100%
delivery capacity per stroke
1 ml/pulse x 100
0,63 ml/stroke
= 159 %
required dosing quantity x pulse sequence of water meter
delivery capacity per stroke x 10
1000 x 1
0,63 x 10
= 159 %
dosing quantity in ml/m³ x nominal size of the water meter in m³/h
delivery capacity per stroke in ml/stroke
1000 ml/m³ x 5 m³/h
0,63 ml/stroke
= 7937 strokes/h
This value is compared with the maximum possible stroke frequency of
the dosing pump. The MAGDOS LD 6 achieves a maximum of 10800
strokes/hour.
Result:
The required stroke frequency must be smaller than the maximum stroke
frequency of the dosing pump, which is the case here.
If the maximum stroke frequency is higher, the dosing pump cannot
continue up to the water meter's maximum flow rate. In this case, the
following versions are possible:
n
Use of a higher dosing pump model, e.g., MAGDOS LD 10 instead of
MAGDOS LD 6
n
Reduction of the dosing quantity via higher concentration of the
dosing medium
n
Increase of the pulse sequence of the contact-type water meter, e.g.,
0.5 l/pulse instead of 1 l/pulse
Содержание MAGDOS LA
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