ProMinent
®
Page 10
Safety / Design and Function
1.3 Tests and Approvals
Explosions protection The conformity certificate of the DMT-Gesellschaft für Forschung und Prüfung mbH, department
for the safety of electric resources, exploring drifts, can be found in the appendix.
Device type Identification mark Approval
EXBbG II 2G Ex d IIC T6 Gb II 2G c IIC T6 Gb DMT 03 ATEX E 023
EXBbG, intrinsically safe II 2(1)G Ex d [ia Ga] IIC T6 Gb II 2G c IIC T6 Gb DMT 03 ATEX E 023
EXBbM I M2 Ex d I Mb I M2 c I Mb DMT 03 ATEX E 023
ExBbM, intrinsically safe I M2(M1) Ex d [ia Ma] I Mb I M2 c I Mb DMT 03 ATEX E 023
EXBbG Class l, Div.1, Group B, C and D, T6 FMR
EXBbG Class l, Div.1, Group B, C and D, T6 CSA
2 Design and Function
You will find the view of the metering pump and the description of the function units on the fold-
out page of the cover.
The metering pump ProMinent EXtronic
®
consists of the main components
Drive unit (1) With electronic control and solenoid,
power connection (10)
Input “external control” (optional) (11);
Delivery unit End ring (3) with diaphragm which is stabilised by a steel core.
Liquid end (4) with delivery connection (2) and intake connection (7),
on types 1000-0417 NP and PP with bypass hose socket (6) and vent valve (5);
Operator control unit with operating/pulse display (9),
Mains switch (not for 500 V version) (13),
Stroke length control knob (14) with observation window (10),
Locking lever (15),
Control knob for stroke rate or pushbutton/pushbutton switch for priming (16) and
transparent cover (17).
2.1 Functional principle
Metering is based on the pulse burst principle:
A pulse produces a magnetic field around the solenoid,
the solenoid attracts a moving thrust piece,
as a result, the diaphragm displaces the medium in the liquid end via a pressure control valve,
the valve closes on the intake side.
The magnetic field decays on completion of the switch-on pulse,
the thrust piece of the solenoid is reset by a reset spring,
the diaphragm returns to its initial position, thus initiating an intake stroke,
which closes the pressure valve and the media is drawn in on the intake side.
2.2 Construction / functional description diaphragm rupture indicator (optional)
The diaphragm rupture signalling system monitors the leak-tightness of the operating
diaphragm.
The liquid end of EXBb with diaphragm rupture signalling has instead of only one operating
diaphragm an additional diaphragm comprising the operational diaphragm and an additional
safety diaphragm, and is equipped with an intrinsically safe diaphragm rupture sensor (see
figure 1).
BA_EX_014_01_12_EN.p65 31.10.2012, 8:58 Uhr10
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