Ashcroft F5504 설치 및 유지보수 지침 매뉴얼 - 페이지 4

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Installation and Maintenance Instructions for

F5504 Differential Pressure Gauges

5.2 Description of function

The compared pressures are measured by flexible stainless

steel diaphragms on either side of the chamber. The two

diaphragms are mechanically linked by a rigid connecting rod.

To compensate high static pressures, the cavity between the

two diaphragms is filled with hydraulic fluid. When pressures

are equal on both diaphragms, they are at zero position.

When there is a difference in pressures acting on the two

diaphragms, they are deflected away from the high pressure

side, towards the lower pressure side, causing a displacement

of the connecting rod. A precision mechanism translates

the linear displacement of the diaphragm connecting rod to

angular movement of the gauge's dial pointer. The pointer's

displacement range of 270° corresponds to the full scale

differential pressure. The connecting rod has intermediate

flanges on either side, which protects the diaphragms against

excess differential pressure.

5.3 Description of components

5.3.1 Dial scale and pointer

The differential pressure gauge is equipped with a dial face and

pointer pursuant to DIN 16003, nominal size 100 mm or 160 mm.

5.3.2 Instrument connection

The instrument connection is located on the underside of the

differential pressure gauge and can be a threaded or flanged

similar to DIN EN 61518.

5.3.3 Vent and flushing connection

The vent and flushing connection of each pressure chamber is

located on its top side. It is closed by a screwed in G

5.4 Accessories

The use of a 3 or 5 valve manifold is highly reccomended.

Please contact Ashcroft or your Ashcroft representative

regarding available special tools and accessories.

All sales subject to standard terms and conditions of sale. F5504_gauge_i&m_008-10299_RevA_05-02-22

¼ NPT

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plug

6 TRANSPORT

6.1 Safety

The differential pressure gauge should be protected against

the effects of knocks and impacts. The device should only be

transported in the packaging provided, to protect against glass

breakage. The device should only be transported in a clean

condition (free of residues of measuring media)

6.2 Transport inspection

The delivery must be checked for completeness and damage

during transport. In the event of damage during transport, the

delivery must not be accepted, or only accepted subject to

reservation of the scope of the damage being recorded and, if

necessary, a complaint initiated

6.3 Storage

The differential pressure gauge must be stored in dry, clean

conditions, within a temperature range of -40 to 160°F (-40

to +70 °C), protected against direct exposure to sunlight and

protected against impact damage

7 ASSEMBLY/INSTALLATION

7.1 Safety

To ensure safe working during installation and servicing,

suitable shut-off valves must be installed (see 5.4 Accessories),

enabling the device:

• To be depressurized or taken out of operation;

• To be disconnected from the main pressure source for repair

or checks within the relevant plant;

• Or to enable function tests of the device to be performed "on

site".

During the mounting/installation of the gauge, the equipment

must be protected against the main pressure source and elec-

trical connections isolated from being switched back on.

7.2 Preparations (requirements for the installation location)

• A check on suitability of the device for the medium to be

measured, the scope of the measurement range and static

pressure and of the protection against special conditions

such as vibration, pulsation and pressure spikes.

• A bracket must be installed to support the pressure gauge if

the process pipe is not able to provide adequate support.

• The installation location should be chosen such that the

work-spaces for operating personnel are not located to the

rear of the pressure gauge.

7.3 Mounting/Installation

7.3.1 Process connection

The instrument is intended and factory adjusted for vertical

mounting, pressure ports downward. When mounted in other

orientation (max. ± 10°) the pointers' zero position needs to be

adjusted (see 7.4.1 Zero point adjustment).

• Connection to be undertaken by authorized and qualified

staff specialist only.