ProMinent Sigma 3 Basic Operating Instructions Manual page 49

Priming against pressure
Adjusting the stroke length
Earthing lines
Potential equalisation lines (mandatory
with ATEX)
Auxiliary equipment
CAUTION!
Danger of the integral relief valve failing
The integral relief valve no longer operates reliably with
feed chemicals having a viscosity of greater than 200
mPa s.
– Only use the integral relief valve with feed chemicals
having a viscosity up to 200 mPa s.
1. Hydraulically isolate the discharge line from the pump using an iso‐
lation 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.
75%
0
25
50
75
20 0
Fig. 20: Adjusting the stroke length
100% = 4 rotations
n
25 % = 1 rotation
n
0.5 % = 1 scale mark on stroke adjustment dial
n
Check whether the earthing lines in the pump's electrical units are cor‐
rectly connected and connected to a clean earth wire - see earthing dia‐
grams in the appendix.
Check whether the potential equalisation lines are sitting correctly on the
pump and connected to a clean potential equalisation point.
Check for the correct function of the auxiliary equipment and for correct
interplay.
30%
0
25
5 0 5
Start up
10
P_SI_0095_SW
49