Ashcroft 5503 Series Інструкція з монтажу та обслуговування - Сторінка 3

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Ashcroft 5503 Series Інструкція з монтажу та обслуговування

Installation and Maintenance Instructions for

5503 Differential Pressure Gauges

5 CONSTRUCTION & FUNCTION

5.1 Overview

1. Connecting rod

2. O-Ring, differential

overpressure protection

3. Sensing diaphragm

4. Movement

5. Lever

6. Link

7. Pressure transfer liquid.

5.2 Description of function

The pressures to be compared act on flexible stainless steel

diaphragms on either side of the sensing capsule. The

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 con-

necting 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° corre-

sponds to the full scale differential pressure. The connecting

rod has intermediate flanges on either side, which protects the

diaphragms against excess differential pressure.

When differential pressure exceeds the specified limit, the flange

towards the lower pressure side is pressed against the sealing

O-ring on the inside of the sensing capsule. This action isolates

the fluid adjacent to the diaphragm exposed to lower pressure,

from the fluid at higher pressure on the other side. This limits the

pressure differential across the lower pressure diaphragm, and

equalizes the pressure across the higher pressure diaphragm.

Thus both diaphragms are protected against excess deflection

and risks of rupturing. The model F5503-XSP is designed for

higher static pressure than the F5503 with stronger pressure

chambers and mounting parts.

5.1 Description of components

5.1.1 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.

5.1.2 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.

All sales subject to standard terms and conditions of sale. 5503_gauge_i&m_RevA_07-18-19

5.1.3 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

5.2 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.

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

two

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 5.2 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.

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