Ashcroft A4 User Manual

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A4 INTRINSICALLY SAFE &

.50

3.065

4.45

.885

1.06

DIA.

1.06 Hex. Common For All Pressure Fittings

.887˝

4.78˝

3.065˝

.675˝

1.06˝

DIA.

(22.5)

(121)

(78)

(17)

(27)

.887˝

4.78˝

3.065˝

.885˝

1.06˝ (27) Hex. Common For All

Pressure Fittings

(22)

(78)

(121)

(22.5)

1.06˝

DIA.

(27)

NON-INCENDIVE RATED PRESSURE TRANSMITTER INSTRUCTION SHEET

WARNING! READ



BEFORE INSTALLATION

1. GENERAL:

A failure resulting in injury or damage may be caused by excessive overpressure, excessive vibration or pressure pulsation, excessive instrument temperature, 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

ump is turned on at full power or a

p valve is quickly opened.

iquid surges are particularly damaging

to pressure transducers if the pipe is originally 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 termination upward) to prevent possible overpressure damage from frozen media.

3. STATIC ELECTRICAL CHARGES:

Any electrical device may be susceptible to damage when exposed to static electrical charges. To avoid damage to the transducer observe the following:

• Operator/installer should follow the roper ESD (electrostatic discharge)

p 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. HAZARDOUS AREA SPECIFIC GUIDELINES

1. Do not open unit when energized.

2. Do not diconnect equipment unless

area is known to be non-hazardous.

Ashcroft®A4 Pressure Transmitter, Typical Dimensions and Construction*

Enclosure Option “S” Enclosure Option “W”

Cable style electrical termination

© 2011 Ashcroft Inc. All rights reser ved. 250 East Main Street, Stratford, CT 06614 USA Tel: 203-378-8281, Fax: 203-385-0402 www.ashcroft.com All sales subject to standard terms and conditions of sale.

Threaded Male Process Connection

I&M011-10166-A4. Rev. 12/12

Dimensions and construction details may vary based on product specified.

Conduit style electrical termination

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.)

V OUT

(1-5 V TYP.)

4.3 FM INSTALLATION GUIDELINES

INSTALLATION FOR FM

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

LASS ll, GROUPS E, F & G &

NSTALLATION 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 INTRINSICALLY SAFE DEVICES FM

PPROVED WITH ENTITY PARAMETERS NOT SPECIFICALLY

A 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 NONINCENDING 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.

CLASS lll

. FOR DIVISION 2 INSTALLATIONS THE ASSOCIATED APPARATUS

IS NOT REQUIRED TO BE FM APPROVED UNDER ENTITY CONCEPT OR NONINCENDIVE FIELD WIRING CONCEPT IF THE A2X(4-20mA) & A4 SERIES PRESSURE TRANSDUCER IS INSTALLED IN ACCORDANCE WITH THE NATIONAL ELECTRICAL CODE (ANSI/NFPA 70) FOR DIVISION 2 WIRING METHODS EXCLUDING NONINCENDIVE FIELD WIRING.

. CONTROL EQUIPMENT CONNECTED TO THE ASSOCIATED APPA-

RATUS 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.

I&M011-10166-A4. Rev. 12/12

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.)

V OUT

(1-5 V TYP.)

4.4 CSA INSTALLATION GUIDELINES

INSTALLATION FOR CSA

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

CLASS ll, GROUPS E, F & G &

CLASS llI

INSTALLATION NOTES:

Vmax 30VDC Imax 100mA Ci = 0.053uF Li = 0.364uH

1. THE INTRINSIC SAFETY ENTITY CONCEPT ALLOWS THE INTERONNECTION OF TWO INTRINSICALLY SAFE DEVICES CSA CER-

C TIFIED WITH ENTITY PARAMETERS NOT SPECIFICALLY EXAMINED IN COMBINATION AS A SYSTEM WHEN: Uo OR Voc Vmax, Io OR Isc Imax, Ca OR Co Ci + Ccable, La OR Lo Li +Lcable, Po Pi.

2. THE NONINCENDIVE FIELD WIRING CONCEPT ALLOWS INTER-

CONNECTION OF NONINCENDING FIELD WIRING APPARATUS WITH ASSOCIATED NONINCENDIVE FIELD APPARATUS USING ANY OF THE WIRING METHODS PERMITTED FOR NON3HAZARDOUS (UNCLASSIFIED) LOCATIONS WHEN: Uo OR Voc Vmax, Io OR Isc Imax, Ca OR Co + Ccable, La OR Lo Li +Lcable, Po Pi.

3. FOR DIVISION 1 INSTALLATIONS, THE CONFIGURATION OF

ASSOCIATED APPARATUS SHALL BE CSA CERTIFIED UNDER ENTITY CONCEPT.

4. FOR DIVISION 2 INSTALLATIONS USING NONINCENDIVE FIELD

WIRING CONCEPTS THE ASSOCIATED APPARATUS SHALL BE

CSA CERTIFIED UNDER THE ENTITY CONCEPT OR NONINCEN-

IVE FIELD WIRING CONCEPT.

5. FOR DIVISION 2 INSTALLATIONS THE ASSOCIATED APPARATUS IS NOT REQUIRED TO BE CSA CERTIFIED UNDER ENTITY CONCEPT OR NONINCENDIVE FIELD WIRING CONCEPT IF THEA2X (4-20mA) & A4 SERIES PRESSURE TRANSDUCER IS INSTALLED IN ACCORDANCE WITH THE CANADIAN ELECTRICAL CODE (CEC, CAN/CSA3C22.1) FOR DIVISION 2 WIRING METHODS EXCLUD-

NG NONINCENDIVE FIELD WIRING.

6. CONTROL EQUIPMENT CONNECTED TO THE ASSOCIATED APPARATUS SHALL NOT USE OR GENERATE MORE THAN 250VRMS OR VDC.

7. ASSOCIATED APPARATUS MANUFACTURERS INSTALLATION DRAWING SHALL BE FOLLOWED WHEN INSTALLING THIS EQUIPMENT.

8. RUN SHIELDED INTERCONNECTION CABLE WITH SHIELD CONNECTED TO FM APPROVED ASSOCIATED APPARATUS GROUND.

9. WARNING – SUBSTITUTION OF COMPONENETS MAY IMPAIR INTRINSIC SAFETY

10. WARNING – TO PREVENT IGNITION OF FLAMMABLE OR COMBUSTIBLE ATMOSPHERES, DISCONNECT POWER BEFORE SERVICING.

I&M011-10166-A4. Rev. 12/12

A4 INTRINSICALLY SAFE &

–

POWER SUPPLY

(+)

(–)

RANSDUCER

–

V+

V–

PIN 1

PIN 2

4-20mA

METER

OR OTHER DEVICE

.062

Z S

“Z” and “S” pots

NON-INCENDIVE RATED PRESSURE TRANSMITTER INSTRUCTION SHEET

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 minimum 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.

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.

Loop Supply Voltage vs. Loop Resistance

1000

30 Vdc max for

800

600

400

200

Loop Resistance (Ohms)

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)

Intrinsically Safe Installations

Loop Supply Voltage (Vdc)

Operating

Region

20 30

Noise

For minimum noise susceptibility, avoid running the transducer’s cable in a conduit that contains high current AC power cables. Where possible avoid running the cable near inductive equipment.

Shielded Cable

Units with shielded cable electrical termi-

ation, connect the drain wire to the

n 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.

A4 Wiring Diagrams

A4 transducer has internal transient protection: for safety, limit line-toground voltage to 36 Vdc max.

Zero and Span Adjustment

Instructions below apply to the particular configurations noted. While Zero adjustment is not normally necessary, it may be desirable 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 transducer, and there may also be interaction of Span on Zero.

A4 configurations with enclosure “S” offer Zero and Span potentiometer

ccess.

Access to “Z” and “S” pots via the top (electrical termination end) of the unit is

tandard on all “S” enclosure units with 4-

s 20mA output. Access is gained by removing the black threaded cap, once removed

ou will see the pots indicated by “Z” and

y “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.

HAZARDOUS AREA CERTIFICATIONS

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

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

Non-Incendive: Class I, II and III Div.1 and 2,

Groups A, B, C, D, F and G per entity requirements see Ashcroft drawing # 825A022

Groups A, B, C, D, F and G, no barriers needed

I&M011-10166-A4. Rev. 12/12

A4 INTRINSICALLY SAFE &

.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

1.062

.71

M12

EL E CT RI CA L TE RM IN AT IO N

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

1.320

.18

.64

DIN 43650-A

EL E CT RI CA L TE RM IN AT IO N

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

1.320

.65

(4) PIN BENDIX STYLE

EL E CT RI CA L TE RM IN AT IO N

SHELL SIZE 8

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

1.320

PIGTAIL

EL E CT RI CA L TE RM IN AT IO N

PLASTIC MOLDED

(F2), (P1)

1.320

.50

Key

Gnd.

NON-INCENDIVE RATED PRESSURE TRANSMITTER INSTRUCTION SHEET

oltage Current

in #

utput Output

A (+) Power (+) Power B (+) Output None C Field Gnd. Field Gnd. D (-) Power (-) Power

ire Voltage Current

olor 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

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

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

I&M011-10166-A4. Rev. 12/12

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

Visit our web site www.ashcroft.com

All sales subject to standard terms and conditions of sale. I&M011-10166-A4. Rev. 10/12

Ashcroft Inc. 250 East Main Street Stratford, CT 06614-5145 USA Tel: 203-378-8281 • Fax: 203-385-0402 email: info@ashcroft.com www.ashcroft.com

Ashcroft A4 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual