Deltabar S
50 Endress+Hauser
P01-xxxxxxxx-05-xx-xx-xx-006
Presentation of the response time (T90%)
1 Pressure step
2Output signal
Installation instructions Instructions for diaphragm seal systems
• The diaphragm seal together with the transmitter form a closed, calibrated system, which is filled through
ports in the diaphragm seal and in the measuring system of the transmitter. These ports are sealed and must
not be opened.
• When selecting the measuring cell, observe the zero shift resulting from the hydrostatic pressure of the filling
fluid columns in the capillaries. (→ See the following illustration).
• When using a mounting bracket, sufficient strain relief must be allowed in order to prevent the capillary from
exceeding a bending radius ≥ 4" / 100 mm.
• The temperature and length of both capillaries should be the same when using two-sided diaphragm seal
systems.
90 %
100 %
t
1
2
T90%
Minimise response time by Comments
Larger capillary internal diameter The temperature effect increases with increasing diameter.
Shorter capillaries –
Filling oil with lower viscosity – Observe compatibility of the filling oil with the fluid.
– Observe the filling oil operating limits.
Selecting the measuring cell (observe the hydrostatic pressure of the filling fluid column in the
capillaries!)
P01-FMD78xxx-11-xx-xx-xx-004.eps
+ –
+
–
max.
min.
DH=1m
Hu = 0.2 m
Hv = 1.8 m
H1 = 0.3 m
= 1.0 kg/dmr
M
3
p
i
= 0.96 kg/dmr
Fl
3
Tank with water
Capillaries with silicone oil
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