FISCHER DS 11, Руководство пользователя, Страница: 3 / 16

3 | 16 Page
valve on the system (see accessories section). This
means that

the device can be depressurized or taken out of
operation

the device can be disconnected from the power
supply within the applicable system for repairs
or inspections.
•
a function test of the device can be performed
on-site.
4.1 Process connection
•
By authorized and qualified specialized person-
nel only.
•
Only for the designated mechanical process
connection (for the model, see the order code
on the device type plate)
•
The pipes need to be depressurized when the
device is being connected.
•
Appropriate steps must be taken to protect the
device from pressure surges.
•
Check the suitability of the device for the media
to be measured.
•
Maximum pressures must be observed.
•
Check that the pressure connections do not
leak before commissioning.
4.1.1 Pressure sensing lines
Remark
Commissioning and repeat tests can be
carried out more efficiently by using a
suitable shut-off device.
The pressure connections are marked with (+) and
(-) symbols on the device. For differential pressure
measurements, the higher pressure is connected to
the (+) side and the lower pressure to the (-) side of
the device. When measuring the pressure, only the
(+) connection is used; the (-) connection is used to
measure under-pressure.
The pressure sensing lines need to be kept as short
as possible and installed without sharp bends to
avoid interfering delay times.
The pressure sensing lines must be installed on a
gradient so that no air pockets e.g. for liquid meas-
urements or water pockets e.g. for gas measure-
ments can be created. If the required inclination is
not reached, water or air filters must be installed at
suitable places.
If liquid measuring media are used the pressure
connection lines must be deaerated, as liquid col-
umns of different heights in the pipes can cause
measuring errors. The instrument must be protect-
ed against frost if water is used as a medium.
4.1.2 Pressure surge absorption
Pulsating pressure on the system side can lead to
wear and functional problems. To safeguard this,
we recommend installing absorption elements in the
pressure pipe line.
Fluid media
In the operational status, the reactor pins need to
be set so that the measurement display follows the
pressure changes with a delay.
Gaseous media
4.2 Electrical connections
•
By authorized and qualified specialized person-
nel only.
Settable reactor pins below the clos-
ing cap
G¼
Capillary throttle coil MZ 401