Stepping motor diaphragm metering pump FEM 1.02 / FEM 1.09
Operation
KNF Flodos AG BA_FEM1-02_1-09_EN_07_157639.docx
Translation of Original Operating and Installation Instructions
19
7.2. Metered volume
Options:
1. Keep speed constant and adjust the metering volume by varying the
operating time.
2. Keep operating time constant and adjust the metering volume by varying
the speed.
Both variants provide extremely accurate metering volumes.
7.3. FEM … .27 version overpressure relief valve adjustment
If the diaphragm metering pump is operating against a closed system, the
delivery pressure quickly exceeds the maximum permissible value. To prevent
this happening, an overflow valve is integrated in the top part of the pump
head. If the pressure exceeds the variable limit range (min. 0.5 to max. 6.5
bar
g
), the valve opens and the liquid circulates from the pressure side to the
suction side via an internal bypass system. This prevents any further rise in
pressure.
1. Connect pressure gauge to pressure side of pump
2. Undo lock nut using an Allen wrench and an open-ended spanner.
3. Switching on the pump
4. Set the required pressure using an Allen wrench
5. Hold Allen wrench and counterhold the nut using the open-ended spanner
6. Re-check the pressure setting
WARNING
The permissible pressure on the type plate must
not be exceeded under any circumstances.
The system or the pump may rupture.
Qty.
Tools/materials
1
Pressure gauge (with sufficient accuracy)
1
Allen wrench 4 mm
1
Open-ended spanner 13 mm
Tab. 12
Fig. 14: Test set-up for overflow
Make sure that the container
(a), pump (b), pressure gauge
(c) and valve (d) are as level as
possible (± 15 cm)
