417102233 Betriebsanleitung EMP III E00, E10
11.5 Metering rates
The reproducible metering precision is about +/- 3 % at a minimum 30 % stroke distance and
under constant conditions.
Due to the characteristics of the pump, higher output can be produced until the operating
temperature is reached.
Precise metering can be achieved by taking the following points into consideration:
a) All metering capacity informations relates to measurements using water at 20°C, with a
constant power supply and warmed-up pump.
b) In order to obtain a high degree of metering precision with free flow, a pressure
maintenance valve (or metering valve) should be used, in order to produce a constant
counterpressure of at least 0,05 MPa (0,5 bar).
c) If there is pre-pressure
0,1 MPa (1 bar) on the suction side, the pressure difference
between the suction and the pressure sides must be at least 1 bar. The water column on
the metering pump must be protected by an appropriate valve arrangement.
NOTE
A pressure control valve or a metering value is not an absolutely hermetically sealing
shutoff device.
WARNING
Metering stroke adjustment may only be performed with the pump running if the stroke
adjusting screw is released.
11.6 Delivery capacity depending on the backpressure and stroke setting
Setting accuracy + 15 %–5 % of the nominal value; all data relate to water at 20 °C and
comply with the notes in the operating instructions.
The tender specifications are shown at a pump frequency of 50 Hz.
11.6.1 Delivery capacity type 00160 / 1 MPa (10 bar)
Fig. 11.2
Metering volume (l/h)
Stroke length setting (%)
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