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Ashcroft T5500 にも：設置およびメンテナンスの手順 (6 ページ)

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Installation and Maintenance Instructions for

T5500 and T6500 Pressure Gauges

5. CONSTRUCTION AND FUNCTION

5.1 Overview

1 - Bourdon tube

2 - Socket and process

connection

3 - Movement

4 - Pointer

5 - Dial

6 - Window

7 - Bayonet ring

8 - Gasket

9 - Vent valve

10 - Case

11 - Blow-out and

compensation plug

5.2 Description of function

The sensing element, a bourdon tube (C-form or helical) that

is welded to the socket, will be exposed from inside with

pressure. Under pressure the elastic tube is deflecting against

the zero position. This deflection is proportional to the adjacent

pressure. The movement transfers the deflection to the pointer.

The display of the measured value is given on a 270° scale.

5.3 Description of components

5.3.1 Scale with pointer

The pressure gauge is equipped with a dial face and pointer

pursuant to EN 837-1, nominal size 100 mm or 160 mm

5.3.2 Instrument connection

The instrument connection is located on the bottom side

(T5500 and T6500) or at the back side (T5500) of the pressure

gauge and is a threaded connection.

5.3.3 Vent valve

The vent valve for the housing is located on the top side. If the

nipple is pulled out, the housing is ventilated and the pressure

which has built up in the housing due to the influence of

temperature is discharged. With the valve closed, protection

class IP 66 (for T6500 dry execution IP65) 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 T5500) or a rear wall capable

of blowing out (Model T6500). These act as a safety feature

pursuant to EN 837-1 and simultaneously allow for temperature

compensation for the housing, via a rubber membrane.

5.4 Accessories

Please contact the manufacturer regarding special tools and

accessories.

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).

All sales subject to standard terms and conditions of sale. T5500-6500_gauge_im_RevB_(008-10263)_01-02-19

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 pressure gauge must be stored in dry, clean conditions,

within a temperature range of -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 in the plant (see 5.4

Accessories), enabling the device:

• To be depressurized or taken out of operation;

• To be disconnected from the mains supply for repair or

checks within the relevant plant;

• 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 of the

protection against special conditions such as vibrations,

pulsations and pressure spikes.

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

the metering pipe is not able to provide adequate support.

• Devices with a blow-out require a minimum spacing to the

rear (20 mm).

• 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

As standard, the device is equipped for pipework mounting

with a pressure connection shank pursuant to DIN EN 837-1.

The device is calibrated ex works for vertical installation.

• Connection to be undertaken by authorized and qualified

specialist staff only.

• Use only with the mechanical process connection provided

– regarding the configuration, see order code on the device

type label, with a matching threaded seal.

• When connecting the device, the pipes must be depressurized.

• The pressure metering pipe must be laid inclined in such

a way that, for example, for measurements of fluids no air