Page 16 of 35
Metering Pumps
Operating and Maintenance Instructions
www.empirepumps.com
Proportional 1XN (VFT, MF, VFT- T, MF -T)
The pump is provided with a connector for connection to an external water meter which can provide a series
of contacts proportional to the amount of liquid that must be treated. A flashing dot on the display shows the
input impulse from the meter. For each contact received, the pump delivers a series of injections equal to the
N value set by the operator. Any contacts that come from the meter to the pump, while it is already delivering
the N series of injections, are ignored.
Proportional 1XN (M) (VFT, MF, VFT -T, MF -T)
Unlike the previous mode, in this one the pump stores any received impulses in the memory while it is
delivering injections. Depending on the time interval between impulses coming from the meter, the pump
automatically adjusts the frequency of the injections. If the injections accumulated and still to be dispensed,
exceed the value "4 × N", the pump will go into alarm (if this alarm has been enabled) and stop the metering.
The display shows dynamically the number of injections that must be provided.
Proportional 1:N (VFT, MF, VFT-T, MF- T)
The pump is provided with a connector for connection to an external water meter which can provide a series
of contacts proportional to the amount of liquid that must be treated. Every N contacts received by the meter,
the pump delivers an injection. The display shows the number of contacts received up to the set value. At
the delivery of the impulse the display resets and begins the next count.
Proportional ml x imp (VFT- S, MF, VFT- S-T, MF-T)
The pump is provided with a connector for connection to an external water meter which can provide a series
of contacts proportional to the amount of liquid that must be treated. For each contact, received from the
meter, the pump delivers a number of injections directly proportional to the set value in "ml" (millilitres)
requested by the user. The display shows in a dynamic manner the amount dosed in "ml".
Proportional l x imp (VFT-S, MF, VFT-S -T, MF- T)
As for the previous mode with the difference being that displayed in litres.
Proportional ml x m3 (VFT- S, MF, VFT- S-T, MF-T)
For those who need a ml x m3 metering a specific function has been provided: by setting the required
parameters in the programming menu, the electronic system performs the necessary calculations and
determines the type of intervention required to effect the pump. The parameters that must be defined are the
following:
L / I METER
Sets the litres per impulse that are delivered by the meter used in the system, the
expected types are as follows:
0.1
–
0.15
–
0.20
–
0.25
–
0.30
–
0.35
–
0.40
–
0.45
–
0.50
–
0.55
–
0.60
–
0.65
–
0.70
–
0.75
–
0.80
–
0.85
–
0.90
–
0.95
–
1
–
1.5
–
2
–
2.5
–
3
–
3.5
–
4
–
4.5
–
5
–
5.5
–
6
–
6.5
–
7
–
7.5
–
8
–
8.5
–
9
–
9.5
–
10
–
15
–
20
–
25
–
30
–
35
–
40
–
45
–
50
–
55
–
60
–
65
–
70
–
75
–
80
–
85
–
90
–
95
–
100
–
150
–
200
–
250
–
300
–
350
–
400
–
450
–
500
–
550
–
600
–
650
–
700
–
750
–
800
–
850
–
900
–
950
–
1000
