Ashcroft A4 User Manual
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
L
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
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 &
C
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
5
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-
6
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.
© 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.
I&M011-10166-A4. Rev. 12/12
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