Ashcroft F6509 설치 및 유지보수 지침 매뉴얼 - 페이지 3

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Installation and Maintenance Instructions for

F5509/F6509 Differential Pressure Gauges

5. CONSTRUCTION AND FUNCTION

5.1 Overview

1 - Sensing diaphragm

2 - Sealing/spring bellows

3 - Connecting rod

4 - Pointer mechanism

5.2 Description of function

The pressures to be compared, differential pressure, act on

a flexible stainless steel diaphragm, which separates the two

pressure chambers.The diaphragm is mechanically linked by a

rigid connecting rod. When pressures are equal on both sides,

the diaphragm is on zero position. When there is a difference

in pressures the diaphragm is 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.

5.3 Description of components

5.3.1 Scale with 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 male or female threaded

process connection. Distance between ports is 37 mm, please

consider this when selecting a 5 valve manifold.

5.3.3 Vent plug

The vent plug for the housing is located on the top of the

gauge case. If the nipple is pulled out, the housing is vented

and the pressure which has built up in the housing due to the

influence of temperature is discharged. With the plug closed,

protection class IP 66 is achieved.

5.3.4 Rear wall/plug with blow-out capability

The pressure gauge has a plug capable of blowing out on

the rear wall of the housing (Model F5509) or a rear wall

capable of blowing out (Model F6509). These act as a safety

feature pursuant to DIN 16003 and simultaneously allow

for temperature compensation for the housing, via a rubber

membrane

5.4 Accessories

Please contact the manufacturer regarding available special

All sales subject to standard terms and conditions of sale. F5509_gauge_im1.0, Rev. A, 08/18

tools and accessories. (e.g.5 valve manifold).

6 TRANSPORT

6.1 Safety

The 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, contact Ashcroft for instructions.

6.3 Storage

The differential pressure gauge must be stored in dry, clean

conditions, within a temperature range of -20 to +80 °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 in the plant (see 5.4

Accessories), enabling the device:

• To be depressurized or taken out of operation;

• To be disconnected from the pressure source for repair or

inspection;

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

site".

During the works to mount/install the gauge, the plant must be

protected against 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 mountering 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 made by authorized and qualified personnel