Basic Installation Notes - ProMinent Hydro/4 Operating Instructions Manual

Fig. 13: Elastomer flat seal for a smooth
insert
Diaphragm rupture sensor

7.1.1 Basic installation notes

Safety notes
P_SI_0022
Personnel:
CAUTION!
Warning of feed chemical spraying around
PTFE seals, which have already been used / compressed,
can no longer reliably seal a hydraulic connection.
– New, unused PTFE seals must always be used.
CAUTION!
Danger due to incorrect use of the pressure relief valve
The pressure relief valve can only protect the motor and the
gear, and that only against impermissible positive pressure
that is monitored by the metering pump itself. It cannot pro‐
tect the system against positive pressure.
– Protect the motor and gear of the system against posi‐
tive pressure using other mechanisms.
– Protect the system against illegal positive pressure using
other mechanisms.
Precise metering is only possible when the back pres‐
–
sure is maintained above 1 bar at all times.
If metering at atmospheric pressure, a back pressure
–
valve should be used to create a back pressure of
approx. 1.5 bar.
For chemicals with a particle size greater than 0.3 mm, the
valves may no longer close properly.
– Install a suitable filter in the suction line.
Technical personnel
n
CAUTION!
Warning of unnoticed diaphragm rupture
Only above approximately 2 bar system back pressure is a
signal generated upon a diaphragm rupture.
– Only rely on the diaphragm rupture sensor at back pres‐
sures greater than 2 bar.
CAUTION!
Danger resulting from rupturing hydraulic components
Hydraulic components can rupture if the maximum permis‐
sible operating pressure is exceeded.
– Never allow the metering pump to run against a closed
shut-off device.
– With metering pumps without integral relief valve: Install
a relief valve in the discharge line.
Installation
25