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6.3 Adjusting and modifying
the measuring range
The measuring range of the differential pres-
sure and flow meter is determined by the in-
stalled set of range springs.
The device is delivered with the measuring
range specified in the order. This means that,
subsequently, it can only be modified contin-
uously up to approx. 60 % of the maximum
measuring span (see Technical data on
page 10).
We recommend adjusting the device on the
test bench (Fig. 7).
NOTICE
!
The test medium must free of oil and grease
when the device is used to measure oxygen.
Only use oil-free air or other gases ( e.g.
N
).
2
Gaseous oxygen (process medium):
− Max. temperature
− Max. oxygen pressure 30 bar
Make sure that the dp cell and all SAMSON
accessories (e.g. valve block) only come into
contact with gaseous oxygen.
Checking the measuring range
1. Check zero as described in section 6.1
while the measuring chamber is the de-
pressurized state.
2. Apply pressure to the high-pressure mea-
suring chamber until the pointer indi-
cates 100 % while the low pressure con-
nection is open.
20
+60 °C
Read off the adjusted pressure value at
the pressure gauge. It corresponds to the
current end value of the measuring
range.
3. Disconnect the pressure again.
Correcting and changing the measuring
range
1. Undo the screws (1) and remove the
cover plate (2).
2. Undo the fastening screw (3) so that the
measuring unit frame (4) can be moved
with ease.
3. Insert a suitable screwdriver into the
7 mm recess to change the position of
the measuring unit frame.
If you want to increase the measuring
range, turn the screwdriver counterclock-
wise. Turn the screwdriver clockwise to
reduce it.
Retighten the fastening screw (3).
4. Correct zero as described in section 6.1.
5. Pressurize measuring chamber again un-
til the pointer indicates the end value.
6. Check the end value of the measuring
range on the pressure gauge.
If it does not correspond with the re-
quired measuring range, repeat adjust-
ment procedure until zero and end value
are properly adjusted.
7. Reinsert the cover plate (2) and tighten
with the screws (1).
EB 9520 EN
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