Sartorius IB 31000 P Specifications download pdf (Page 20)

0.50

06..

--1,,°5..2*=511

.11.4

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ten

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ZFIII..

(uf.mie.

LEI.e"fca,

connle,fon

Red Supplypo,itivi

81ue Suppfy neo_tivi

V,lIow Output po.jljv.

Ot ••

OUlput

n.g.'ivi

poeR 81

Figure 7.1.1

Outfine of Druck PDCR

pressure transducer.

pore-pressure is measured with respect to a reference pressure. Normally this will be the atmospheric

pressure, to which the transducer is connected via a vented Tetlon cabie. For this reason special

attention should be paid to avoid squeezing of the cabie, and of course to measure the changes in the

atmospheric pressure if the measurements take more than one day.

The pressure transducer is connected with a Druck OPI 260 digital pressure indicator. This device

measures and indicates the pressure in any specified scale units and provides accuracies of

+/-

0.1 %

of the full scale

(F.S.).

Both digital and analogue outputs are available via a BCO plug.

the

analogue output option is chosen, 10 Vdc corresponds to the maximum range of the transducer.

Further specifications of the pressure transducer are printed in table 7.1.1.

Table 7.1.1

Speciftcations of PDCR

with a range of

mbar.

effective diameter of membrane

2.54

displacement of membrane at

0.84

JLm

75 mbar

internal volume change from 0

0.0022

mm'

to 75 mbar

Combined non-linearity

0.2%

B.S.L."'J

hysteresis

Thermal zero shift

0.05%

F.S.l°C

ThermaJ sensitivity shift

0.2 % of

reading/=C

Operating temperature range

-20° to 120°C

"'J

B.S.L. : Best Straight Line

Assuming the specifications presented in table 7.1.1 and figure 7.1.1 it can be calculated that the tluid

in the filter is displaced over 1.11'10-

mm as the pore-pressure changes 1 mbar. As a consequence

of the very small displacement of the tluid the filter will not be ciogged by mud particies.

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