Deltabar S
Hauser
65
Installation instructions
In order to obtain more precise measurement results and to avoid a defect in the device, mount the capillaries
as follows:
• vibration-free (in order to avoid additional pressure fluctuations)
• not in the vicinity of heating or cooling lines
• insulate if the ambient temperature is below ore above the reference temperature
• with a bending radius of
100 mm.
Vacuum applications
For applications under vacuum, Hauser recommends mounting the pressure transmitter underneath
the lower diaphragm seal. A vacuum load of the diaphragm seal caused by the presence of filling oil in the
capillaries is hereby prevented.
When the pressure transmitter is mounted above the lower diaphragm seal, the maximum height difference
H1 in accordance with the following illustration on the left must not be exceeded. The maximum height
difference is dependent on the density of the filling oil and the smallest ever pressure that is permitted to occur
at the diaphragm seal on the positive side (empty tank), see the following illustration, on the right.
Result:
If the tank were full, a differential pressure of –51.80 mbar would be present at the differential pressure transmitter. When
the tank is empty, a differential pressure of –149.90 mbar is present. Therefore, a 500 mbar measuring cell is required for
this application.
P01-FMD7xxxx-11-xx-xx-xx-001
Installation above the lower diaphragm seal
P01-FMD7xxxx-05-xx-xx-en-002
Diagram of maximum installation height above the lower diaphragm
seal for vacuum applications dependent on the pressure at the
diaphragm seal on the positive side
+
–
+
–
H
1
–
+
0.0
2.0
4.0
6.0
8.0
10.0
12.0
50 100
300
400
500
600
700
800
900 1000
200
I
ne
rt
o
il
Hi
gh
t
e
m
pe
rat
u
r
e
o
il
V
ege
tabl
e o
il
S
ili
cone o
il
P
r
essu
r
e
,
d
ia
ph
ra
g
m
se
al
pos
iti
ve s
i
de
[mbarab
s
]
H
e
i
gh
t
d
i
ff
e
r
ence
H1
[m]
L
o
w t
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m
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rat
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il
