Product description
Rating plate
11
Subject to technical changes.
Stepper motor-driven diaphragm dosing pump NXP-M and NXP-P
Operating instructions
4.3.3 Control element of the NXP-M
Fig. 3: Dosing pump control NXP-M
No.
Description
1
Stroke frequency setting
2
Power LED
3
Alarm LED
4
Release input for external start/stop
5
Mains cable for power supply
Table 8: Designation of components
4.3.4 Control element of the NXP-P
a
b
d
c
Fig. 4: Dosing pump control NXP-P
No.
Description
1
Graphic display
2
Multifunction keys on the contol unit for operator inputs
3
Connection ports for external operation
4
Mains cable for power supply
Table 9: Designation of components
4.4 Function description
Dosing pumps are positive displacement pumps. They are used if
precisely defined delivery of a medium is necessary. A constant volume
per stroke or time is delivered.
The system delivers or meters the dosing medium by means of a
repeated sequence of suction strokes followed by pressure strokes. This
results in a pulsing flow.
If the dosing pump is in the suction stroke phase, the diaphragm is pulled
into the rear final position. Due to the resulting vacuum in the dosing
head, the discharge valve closes, the suction valve opens and dosing
medium flows from the suction line into the dosing head.
If the dosing pump is in the pressure stroke phase, the diaphragm is
moved into the front final position. Due to the pressure in the dosing head,
the suction valve closes and the dosing medium flows through the
discharge valve from the dosing head into the pressurised pipe.
4.5 Rating plate
There is information on the equipment about safety or the product's way
of functioning. The information must stay legible for the duration of the
service life of the product.
Fig. 5: Rating plate NXP-M and NXP-P
No.
Description
1
Product, type, nominal size
2
Maximum delivery capacity at average pressure
3
Maximum delivery capacity at maximum pressure
4
Protection class
5
Voltage supply
6
CSA certificate
7
WEEE label
8
Frequency
9
Power consumption
10
Serial number
11
Month / year of manufacture
12
Material of the dosing head / seals
Table 10: Rating plate
a
b
c
d
e
NXP
11
10
2
1
4
5
6
7
8
9
12
3