Ashcroft A4 User manual

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

A4 INTRINSICALLY SAFE &

NON-INCENDIVE RATED PRESSURE

TRANSMITTER INSTRUCTION SHEET

mWARNING! 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

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.

Surges occur when flow is suddenly

begun, as when a pump is turned on at

full power or a valve is quickly opened.

Liquid surges are particularly damaging

to pressure transducers if the pipe is orig-

inally empty. To avoid damaging surges,

fluid lines should remain full (if possible),

pumps should be brought up to power

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:

• Operator/installer should follow the

proper ESD (electrostatic discharge)

protection procedures before handling

the pressure transducer.

• Ground the body of the transducer

BEFORE making any electrical

connections

• When disconnecting, remove the

ground LAST!

Note: The shield and drain wire in the

cable (if supplied) is not connected to

the transducer body, and is not a suitable

ground.

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

.83

4.78

3.065

.885

.50

3.065

4.45

2.200

.885

.83

4.78

3.065

.675

.50

3.065

4.45

2.200

1.470

2.490

1.06

DIA.

1.06 Hex.

Common For All

Pressure Fittings

1.06 Hex.

Common For All

Pressure Fittings

1.06

DIA. 1.06

DIA.

1.06

DIA.

.50

3.065

4.45

2.200

.885

1.06

DIA.

1.06 Hex.

Common For All

Pressure Fittings

Cable style

electrical

termination

Threaded Male Process Connection

Ashcroft®A4 Pressure Transmitter, Typical Dimensions and Construction*

Enclosure Option “S” Enclosure Option “W”

*Dimensions and construction details may vary based on product specified.

Conduit style

electrical

termination

.887˝

4.78˝

3.065˝

.675˝

1.06˝

DIA.

.887˝

4.78˝

3.065˝

.885˝ 1.06˝ (27) Hex.

Common For All

Pressure Fittings

(22.5)

(121)

(78)

(17)

(22)

(78)

(121)

(22.5)

(27)

1.06˝

DIA.

(27)

.887˝

4.78˝

3.065˝

.675˝

1.06˝

DIA.

.887˝

4.78˝

3.065˝

.885˝ 1.06˝ (27) Hex.

Common For All

Pressure Fittings

(22.5)

(121)

(78)

(17)

(22)

(78)

(121)

(22.5)

(27)

1.06˝

DIA.

(27)

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

A4 INTRINSICALLY SAFE &

NON-INCENDIVE RATED PRESSURE

TRANSMITTER INSTRUCTION SHEET

Power Supply

Power Supply Voltage

Output Signal Min Max

4-20mA* 12V** 30V

* Refer to Ashcroft drawing #825A022 for

supply voltage and load limit.

** The minimum voltage at the terminals is

12Vdc. However, the minimum supply

voltage should be calculated using the

following graph and formula.

Mounting

The A4 transmitter requires no special

mounting hardware, and can be mounted in

any plane with negligible position error.

Although the unit can withstand normal

vibration without damage or significant

output effects, it is always good practice to

mount the transducer where there is mini-

mum vibration.

For units with NPT type pressure fittings

apply Teflon®tape or an equivalent sealant

to the threads before installing.

When tightening, apply a wrench to the

hex wrench flats located just above the

pressure fitting. DO NOT tighten by using a

pipe wrench on the housing.

Noise

For minimum noise susceptibility, avoid

running the transducer’s cable in a con-

duit that contains high current AC power

cables. Where possible avoid running the

cable near inductive equipment.

Shielded Cable

Units with shielded cable electrical ter-

mination, connect the drain wire to the

guard terminal on the read out device or

measuring instrument, if available. In all

other cases connect to the ground or to the

power supply negative terminal.

Vent Tube (Cable Termination Only)

The cable has a clear Teflon®vent tube

required at pressure ranges below 500

psi to provide atmospheric reference. The

open end should be placed in a

dry area.

–

POWER

SUPPLY

(+)

(–)

TRANSDUCER

–

V+

V–

PIN 1

PIN 2

4-20mA

METER

OR OTHER DE

VICE

A4 Wiring Diagrams

Zero and Span Adjustment

Instructions below apply to the particular

configurations noted. While Zero adjustment

is not normally necessary, it may be desir-

able to trim out any offset in the system.

However, proper Span calibration requires a

pressure standard three to five times more

accurate than the accuracy of the trans-

ducer, and there may also be interaction of

Span on Zero.

A4 transducer has internal transient

protection: for safety, limit line-to-

ground voltage to 36 Vdc max.

A4 configurations with enclosure “S”

offer Zero and Span potentiometer

access.

Access to “Z” and “S” pots via the top

(electrical termination end) of the unit is

standard on all “S” enclosure units with

4-20mA output. Access is gained by

removing the black threaded cap, once

removed you will see the pots indicated

by “Z” and “S” respectively as shown

below. Using a small trim pot tool, you

can adjust zero ±10% of full scale and

span ±10% of full scale.

Recalibration Instructions:

1. Apply 0% full scale pressure.

2. Adjust the output using the zero adjust

trim pot.

3. Apply 100% full scale pressure.

4. Adjust the output using the span

adjustment trim pot.

5. Repeat steps 1 through 4 as necessary.

.062

Z S

“Z” and “S” pots

Vmin = 12V+ (.022A x RL) (includes a 10% safety factor)

RL = RS + RW

RL = Loop Resistance (ohms)

RS = Sense Resistance (ohms)

RW = Wire Resistance (ohms)

1000

800

600

400

200

20 30

Operating

Region

30 Vdc max for

Intrinsically Safe

Installations

Loop Supply Voltage (Vdc)

Loop Supply Voltage vs. Loop Resistance

Loop Resistance (Ohms)

HAZARDOUS AREA CERTIFICATIONS

Intrinsically Safe (applies to 4-20mA) FM/CSA:

Intrinsic Safety: Class I, II and III Div.1 and 2,

Groups A, B, C, D, F and G per

entity requirements see Ashcroft

drawing # 825A022

Non-Incendive: Class I, II and III Div. 2,

Groups A, B, C, D, F and G,

no barriers needed

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

A4 INTRINSICALLY SAFE &

NON-INCENDIVE RATED PRESSURE

TRANSMITTER INSTRUCTION SHEET

.600

(4) PIN BENDIX STYLE

ELECTRICAL TERMINATION

SHELL SIZE 8

(B4), (H1), (L1), (P2)

PROCESS

FITTING

(REF.)

1.062

1.000

.830

PIGTAIL

ELECTRICAL TERMINATION

CONDUIT - 1/2 NPT MALE

(C1), (P7)

ELECTRICAL TERMINATIONS FOR

WELDED HOUSINGS ONLY

EXCLUDING EXPLOSION PROOF

1.062

.830

FLYING LEADS

ELECTRICAL TERMINATION

CONDUIT - 1/2 NPT MALE

(C2), (C3), (C4)

ELECTRICAL TERMINATION FOR

WELDED HOUSINGS ONLY

INCLUDING EXPLOSION PROOF

1.062

.71

M12

ELECTRICAL TERMINATION

(EW), (E0), (E1), (E2)

1.320

.18

.64

DIN 43650-A

ELECTRICAL TERMINATION

(CD), (DN), (D0), (D1), (D2)

ELECTRICAL TERMINATIONS FOR THREADED HOUSINGS ONLY

1.320

.65

(4) PIN BENDIX STYLE

ELECTRICAL TERMINATION

SHELL SIZE 8

(B4), (H1), (L1), (P2)

1.320

PIGTAIL

ELECTRICAL TERMINATION

PLASTIC MOLDED

(F2), (P1)

1.320

.50

3.065

4.45

2.200

.885

.50

Key

3 Gnd.

Pin Voltage Current Mating

No. Output Output Cable Color

1 (+) Power (+) Power Red

2 (+) Output None White

3 Field Gnd. Field Gnd. Green

4 (-) Power (-) Power Black

Pin Voltage Current Mating

No. Output Output Cable Color

1 (+) Power (+) Power Red

2 (-) Power (-) Power Black

3 (+) Output None White

GND Field Gnd. Field Gnd. Green

Wire Voltage Current

Color Output Output

Red (+) Power (+) Power

White (+) Output None

Black (-) Power (-) Power

Green Field Gnd. Field Gnd.

Bare Drain Wire Drain Wire

Pin # Voltage Current

Output Output

A (+) Power (+) Power

B (+) Output None

C Field Gnd. Field Gnd.

D (-) Power (-) Power

Wire Voltage Current

Color Output Output

Red (+) Power (+) Power

White (+) Output None

Black (-) Power (-) Power

Green Field Grd. Field Grd.

Bare Drain Wire Drain Wire

Pin Voltage Current Mating

No. Output Output Cable Color

A (+) Power (+) Power Red

B (+) Output None White

C Field Gnd. Field Gnd. Geen

D (-) Power (-) Power Black

.600

(4) PIN BENDIX STYLE

ELECTRICAL TERMINATION

SHELL SIZE 8

(B4), (H1), (L1), (P2)

PROCESS

FITTING

(REF.)

1.062

1.000

.830

PIGTAIL

ELECTRICAL TERMINATION

CONDUIT - 1/2 NPT MALE

(C1), (P7)

ELECTRICAL TERMINATIONS FOR

WELDED HOUSINGS ONLY

EXCLUDING EXPLOSION PROOF

1.062

.830

FLYING LEADS

ELECTRICAL TERMINATION

CONDUIT - 1/2 NPT MALE

(C2), (C3), (C4)

ELECTRICAL TERMINATION FOR

WELDED HOUSINGS ONLY

INCLUDING EXPLOSION PROOF

1.062

.600

(4) PIN BENDIX STYLE

ELECTRICAL TERMINATION

SHELL SIZE 8

(B4), (H1), (L1), (P2)

PROCESS

FITTING

(REF.)

1.062

1.000

.830

PIGTAIL

ELECTRICAL TERMINATION

CONDUIT - 1/2 NPT MALE

(C1), (P7)

ELECTRICAL TERMINATIONS FOR

WELDED HOUSINGS ONLY

EXCLUDING EXPLOSION PROOF

1.062

.830

FLYING LEADS

ELECTRICAL TERMINATION

CONDUIT - 1/2 NPT MALE

(C2), (C3), (C4)

ELECTRICAL TERMINATION FOR

WELDED HOUSINGS ONLY

INCLUDING EXPLOSION PROOF

1.062

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

A4 INTRINSICALLY SAFE &

NON-INCENDIVE RATED PRESSURE

TRANSMITTER INSTRUCTION SHEET

INSTALLATION FOR FM

INTRINSICALLY SAFE CLASS 1, GROUPS A, B, C & D &

CLASS ll, GROUPS E, F & G &

CLASS lll

INSTALLATION NOTES:

Voc OR Vt ≤30VDC

Isc OR It ≤100mA

Ca≥0.053uF + Ccable

La ≥0.364uH + Lcable

1. THE INTRINSIC SAFETY ENTITY CONCEPT ALLOWS THE INTERCONNECTION OF TWO INTRIN -

SICALLY SAFE DEVICES FM APPROVED WITH ENTITY PARAMETERS NOT SPECIFICALLY

EXAMINED IN COMBINATION AS A SYSTEM WHEN: Uo OR Voc OR V≤t Vmax, Io OR Isc OR≤

It Imax, Ca OR Co ≥Ci + Ccable, La OR ≥Lo Li +Lcable≤, Po Pi.

2. THE NONINCENDIVE FIELD WIRING CONCEPT ALLOWS INTERCONNECTION OF NONINCEND -

ING FIELD WIRING APPARATUS WITH ASSOCIATED NONINCENDIVE FIELD APPARATUS

USING ANY OF THE WIRING METHODS PERMITTED FOR NON3HAZARDOUS (UNCLASSIFIED)

LOCATIONS WHEN: Uo OR Voc OR Vt Vmax, Io OR Isc OR It Imax, Ca OR Co + Ccable, La OR

Lo Li +Lcable, Po Pi.

3. FOR DIVISION 1 INSTALLATIONS, THE CONFIGURATION OF ASSOCIATED APPARATUS SHALL

BE FM APPROVED UNDER ENTITY CONCEPT.

4. FOR DIVISION 2 INSTALLATIONS USING NONINCENDIVE FIELD WIRING CONCEPTS THE

ASSOCIATED APPARATUS SHALL BE FM APPROVED UNDER THE ENTITY CONCEPT OR

NONINCENDIVE FIELD WIRING CONCEPT.

5. FOR DIVISION 2 INSTALLATIONS THE ASSOCIATED APPARATUS IS NOT REQUIRED TO BE FM

APPROVED UNDER ENTITY CONCEPT OR NONINCENDIVE FIELD WIRING CONCEPT IF THE

A2 SERIES PRESSURE TRANSDUCER IS INSTALLED IN ACCORDANCE WITH THE NATIONAL

ELECTRICAL CODE (ANSI/NFPA 70) FOR DIVISION 2 WIRING METHODS EXCLUDING

NONINCENDIVE FIELD WIRING.

6. CONTROL EQUIPMENT CONNECTED TO THE ASSOCIATED APPARATUS SHALL NOT USE OR

GENERATE MORE THAN 250VRMS OR VDC.

7. DIVISION 1 INSTALLATIONS SHOULD BE IN ACCORDANCE WITH ANSI/ISA RP12.06.01,

“INSTALLATION OF INTRINSICALLY SAFE SYSTEMS FOR HAZARDOUS (CLASSIFIED)

LOCATIONS” AND THE NATIONAL ELECTRICAL CODE (ANSI/NFPA 70).

8. ASSOCIATED APPARATUS MANUFACTURERS INSTALLATION DRAWING SHALL BE FOLLOWED

WHEN INSTALLING THIS EQUIPMENT.

9. RUN SHIELDED INTERCONNECTION CABLE WITH SHIELD CONNECTED TO FM APPROVED

ASSOCIATED APPARATUS GROUND.

10. WARNING – DO NOT OPEN WHEN ENERGIZED.

11. WARNING – DO NOT DISCONNECT EQUIPMENT UNLESS AREA IS KNOWN TO BE

NON-HAZARDOUS.

HAZARDOUS (CLASSIFIED) AREA

CLASS I, DIVISION 1 & 2,

GROUPS A, B, C, & D;

CLASS II, DIVISION 1 & 2,

GROUPS E, F & G, CLASS III

NON-HAZARDOUS

(UNCLASSIFIED) AREA

BARRIER

V+

V–

MODEL A2X & A4 SERIES

4-20MA TRANSMITTER

R LOAD

250 OHM

TYP.

R LOAD

250 OHM

TYP.

MODEL A2X & A4 SERIES

4-20MA TRANSMITTER

V+

V–

+24 VDC TYP.

–24 VDC TYP.

–

V OUT

(1-5 V TYP.)