Samson 2488 N - 6 Operation; Adjusting the Set Points; Flow Rate

20 EB 3136 EN
Operation
6 Operation
6.1 Adjusting the set point
6.1.1 Flow rate
Î Completely open the control and shut-off
valves or the bypass valve in the plant.
To adjust or change the ow rate set point,
proceed as follows:
Always adjust the set point based on a
closed restriction.
Risk of damage to the restriction stem
through one-side loading while turning the
set point screw clockwise.
First turn the handwheel of the electric actua-
tor to completely close the restriction.
1. To close the restriction (11), de-energize
the electric actuator (16).
2. Turn the manual adjuster (19) clockwise
() as far as it will go to close the re-
striction.
3. Use a suitable tool (Allen key, SW4) to
turn the set point screw (13) clockwise
() as far as it will go.
4. Refer to Fig.6 to nd out how many
turns are required to set the ow rate.
5. Use a suitable tool (Allen key, SW4) to
turn the set point screw (13) by the re-
quired number of turns. Turn it counter-
clockwise () to open the restriction. The
ow rate rises.
NOTICE
!
6. Guide the wire through the lead-seal
hole and lead-seal it to x the adjusted
ow rate.
7. Reconnect the power supply to the elec-
tric actuator (16).
For exact adjustment, verify adjusted value
with a heat or ow meter.
0.1
0.5
1
1
0
2
3
4
5
V
˚
m
3
/h
0.2
2
2.51.6K
vs
Turns of the set point screw
Fig.6: Adjustment diagram for ow rate
Tip