Ashcroft A4 Инструктивный лист

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A4 INTRINSICALLY SAFE &

NON-INCENDIVE RATED PRESSURE

TRANSMITTER INSTRUCTION SHEET

m WARNING! READ m

BEFORE INSTALLATION

1. GENERAL:

A failure resulting in injury or damage

may be caused by excessive overpres-

sure, excessive vibration or pressure

pulsation, excessive instrument tem-

perature, corrosion of the pressure

containing parts, or other misuse.

Consult Ashcroft Inc., Stratford,

Connecticut, USA before installing if

there are any questions or concerns.

2. OVERPRESSURE:

Pressure spikes in excess of the rated

overpressure capability of the transducer

may cause irreversible electrical and/

or mechanical damage to the pressure

measuring and containing elements.

Fluid hammer and surges can destroy

.83

any pressure transducer and must always

be avoided. A pressure snubber should

be installed to eliminate the damaging

hammer effects. Fluid hammer occurs

when a liquid flow is suddenly stopped,

as with quick closing solenoid valves.

4.78

Surges occur when flow is suddenly

begun, as when a pump is turned on at

full power or a valve is quickly opened.

3.065

Liquid surges are particularly damaging

1.06

to pressure transducers if the pipe is orig-

DIA.

inally empty. To avoid damaging surges,

fluid lines should remain full (if possible),

pumps should be brought up to power

.885

1.06 Hex.

Common For All

Ashcroft

A4 Pressure Transmitter, Typical Dimensions and Construction*

Pressure Fittings

Enclosure Option "S"

.50

4.45

3.065

.885

1.06 Hex.

Common For All

Pressure Fittings

Threaded Male Process Connection

All sales subject to standard terms and conditions of sale. A4_transducer_im_ RevB_(009-10166)_09-18

slowly, and valves opened slowly. To

avoid damage from both fluid hammer

and surges, a surge chamber should be

installed.

Symptoms of fluid hammer and surge's

damaging effects:

• Pressure transducer exhibits an output

at zero pressure (large zero offset).

• Pressure transducer output remains

constant regardless of pressure

• In severe cases, there will be no output.

FREEZING:

Prohibit freezing of media in pressure

port. Unit should be drained (mount in

vertical position with electrical termina-

tion upward) to prevent possible over-

pressure damage from frozen media.

3. STATIC ELECTRICAL CHARGES:

Any electrical device may be susceptible

to damage when exposed to static elec-

trical charges. To avoid damage to the

transducer observe the following:

.83

• Operator/installer should follow the

proper ESD (electrostatic discharge)

protection procedures before handling

the pressure transducer.

• Ground the body of the transducer

4.78

BEFORE making any electrical

connections

3.065

• When disconnecting, remove the

ground LAST!

1.06

DIA.

Note: The shield and drain wire in the

cable (if supplied) is not connected to

the transducer body, and is not a suitable

ground.

.675

Cable style

electrical

termination

4.78˝

(121)

1.06

DIA.

Enclosure Option "W"

.887˝

(22.5)

4.78˝

(121)

2.200

4.78˝

(121)

3.065˝

(78)

1.06˝

(27)

DIA.

.675˝

(17)

Dimensions and construction details may vary based on product specified.

4. WARNING/AVERTISSEMENT

• DO NOT OPEN UNIT WHEN

ENERGIZED

NE PAS OUVRIR L'APPAREIL

LORSQU'IL EST SOUS TENSION

• SUBSTITUTION OF COMPONENTS

MAY IMPAIR INTRINSIC SAFETY

LA SUBSTITUTION DE COMPOSANTS

PEUT COMPROMETTRE LA

SÉCURITÉ INTRINSÈQUE"

• EXPLOSION HAZARD - DO NOT

DISCONNECT WHILE CIRCUIT IS

LIVE UNLESS AREA IS KNOWN TO

BE NON-HAZARDOUS

RISQUE D'EXPLOSION. NE PAS

DÉBRANCHER TANT QUE LE

CIRCUIT EST SOUS TENSION, À

MOINS QU'lL NE S'AGISSE D'UN

EMPLACEMENT NON DANGEREUX

• EXPLOSION HAZARD –

SUBSTITUTION OF COMPONENTS

MAY IMPAIR SUITABILITY FOR

CLASS I, DIVISION 2

RISQUE D'EXPLOSION – LA

SUBSTITUTION DE COMPOSANTS

PEUT RENDRE CE MATÉRIEL

INACCEPTABLE POUR LES

EMPLACEMENTS DE CLASSE I,

DIVISION 2

.887˝

(22.5)

4.78˝

(121)

3.065˝

(78)

1.06˝

(27)

1.06˝

DIA.

(27)

DIA.

.885˝

1.06˝ (27) Hex.

(22)

1.06˝ (27) Hex.

(22)

Common For All

Pressure Fittings

Conduit style

electrical

termination

1.06˝

(27)

DIA.