Endress+Hauser Flowfit CYA27, Руководство по эксплуатации

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Installation Flowfit CYA27
20 Hauser
5.3.4 Bypass with return
The counterpressure p2 is the definitive counterpressure for the assembly or sensors
and must not under any circumstances exceed the permitted pressure specification of
the assembly or sensors.
To achieve flow through the assembly with a bypass, pressure p1 must be higher than
pressure p2.
This requires the installation of an orifice plate or throttle valve in the main pipe.
p1 must not exceed the permitted operating pressure of the assembly of 4 bar (58 psi)
relative.
If the sensor is installed, the sensor's pressure specifications must also be observed.
1. Install the assembly horizontally →  12.
2. Connect the medium using the usual commercial connection fittings. Depending on
requirements, use conventional sealing materials, e.g. thread sealing tape or O-ring
made of FKM.
3. Installing the assembly in the bypass is preferable to installing it directly in the
process line. The bypass line can be blocked off without interrupting the process (a
shut-off valve is required upstream and downstream). This enables sensor cleaning,
for example, without affecting the process.
4. Install a dirt trap (screen) with a mesh size of 500 µm upstream from the assembly. If
a pressure-reducing valve is used, it usually includes a dirt trap.
5. Set the flow value upstream from the assembly, e.g. via an upstream flow regulator.
Flowfit CYA27
3 4 6
7
8
2
1
5
9
p1 p2
p1 > p2
A0043507
 9 Connection example with bypass and orifice plate in the main pipe
1 Main inlet line
2 Manual valve (not included in scope of delivery)
3 Check valve (not included in scope of delivery)
4 Pressure-reducing valve (optional, not included in scope of delivery)
5 Filter trap (optional, not included in scope of delivery)
6 CYA27 assembly
7 Manual valve (not included in scope of delivery)
8 Main output line
9 Orifice plate (not included in scope of delivery)
To take an assembly installed in this way out of operation, pressure relief should be
provided so that the pressure in the assembly can be reduced safely after shutting off
the supply and return lines. Suitable solutions include the optional sampling valve on
the assembly or the provision of a sampling point in the line.