Samson 4765, Монтаж и эксплуатация

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2. Increase the instrument input signal and
gradually decrease again to 1 bar,
checking whether the control valve be-
gins to move at exactly 1 bar.
Correct the deviation using the zero ad-
justment screw (4). Turn it counterclock-
wise to move the control valve earlier
from its final position and clockwise to
move it later.
Upper range value (span) e.g. 1 bar
3. Once the starting point has been ad-
justed, set the instrument input signal to
0.2 bar. When the final value reaches
exactly 0.2 bar, the plug stem must be
motionless and therefore have passed
100 % travel (watch travel indicator).
4. If the final value does not match, slide the
pin (2) to correct. Set to 1 bar again and
turn the zero adjustment screw (4), until
the pressure gauge indicates the re-
quired signal pressure (see also section
3.1.2).
In case there is no pressure gauge avail-
able, set the starting point to 0.97 bar
instead.
4.4 Exchanging the range spring
If the range is to be altered or changed to
split-range operation, replace the range
spring as shown in Fig. 3 as follows:
1. Remove screw (7) on the range spring.
Pull out hexagon socket screw (5) and
the lever together with shaft.
2. Exchange range spring. Slide lever with
shaft through sleeve (3), positioner hous-
ing and bracket (6.1).
3. Secure range spring with the screw (7).
4. Move bracket and shaft until the screw
(5) sits on the flattened part of the shaft.
Tighten screw (5). Allow for a play from
0.05 to 0.15 mm between the lever (1)
and the sleeve (3) as well as between the
range spring (6) and the positioner
housing.
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EB 8359-1 EN
Operation