CAUTION!
Danger due to incorrect use of the integral relief valve
The integral relief valve can only protect the motor and
the gear, and then only against impermissible positive
pressure that is caused by the metering pump itself. It
cannot protect the system against positive pressure.
–
Protect the motor and gear of the system against
positive pressure using other mechanisms.
–
Protect the system against illegal positive pressure
using other mechanisms.
Failure of the integral relief valve
n
The integral relief valve no longer operates reliably with feed chemi‐
cals that have a viscosity of greater than 200 mPa s.
n
Only use the integral relief valve with feed chemicals that have a vis‐
cosity of up to 200 mPa s.
1.
Hydraulically isolate the pressure line from the pump using an isola‐
tion device.
2.
Turn the rotary dial on the integral relief valve in a counter-clockwise
direction as far as the "open" stop.
ð
The excess pressure escapes through the hose connector.
3.
Run the pump until the feed chemical coming out of the hose con‐
nector is free from bubbles.
4.
Turn the rotary dial on the integral relief valve in a clockwise direc‐
tion up to the "close" stop.
ð
The pump can be started.
When operating the integral relief valve close to the
opening pressure, a minimal overflow into the overflow
line can occur.
Only adjust the stroke length when the pump is running. This is easier and
also better for the pump.
20
0
0
50
25
75
5
75%
0
5
0
25
10
30%
P_SI_0095_SW
Fig. 20: Adjusting the stroke length
n
100% = 4 rotations
n
25 % = 1 rotation
n
0.5 % = 1 scale mark on stroke adjustment dial
Check whether the earthing lines in the pump's electrical assemblies are
correctly connected and connected to a clean earth wire - see earthing
diagrams in the appendix.
Check whether the potential equalisation lines are sitting correctly on the
pump and connected to a clean potential equalisation point.
Using the integral relief valve
Priming against pressure
Adjusting the stroke length
Earthing lines
Potential equalisation lines (mandatory
with ATEX)
Start up
44
Summary of Contents for Sigma / 2 Basic S2Ba
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