Ashcroft A2X User manual

©2018 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. A2X_transducer_im_ RevB_(009-10167)_09-18
A2X EXPLOSION/FLAME PROOF
PRESSURE TRANSDUCER
INSTRUCTION SHEET
Ashcroft®A2X Pressure Transmitter, Typical Dimensions and Construction*
*Dimensions and construction details may vary based on product specified.
Conduit
electrical
termination
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
.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)
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

©2018 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. A2X_transducer_im_ RevB_(009-10167)_09-18
A2X EXPLOSION/FLAME PROOF
PRESSURE TRANSDUCER
INSTRUCTION SHEET
Power Supply
Power Supply Voltage
Output Signal Min Max
0-5Vdc 10V 30V
1-5Vdc 10V 30V
1-6Vdc 10V 30V
0-10V 14V 30V
4-20mA* 12V 30V**
* For transmitters with 4-20mA output
signal, the minimum voltage at the tem-
inals is 12Vdc. However, the minimum
supply voltage should be calculated using
the following graph and formula.
** For Intrinsically Safe Installations max,
supply voltage is 30Vdc. Refer to Ashcroft
drawing #825A022 for wiring and installa-
tion requirements.
Mounting
The A2X 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 leads in a con-
duit that contains high current AC power
cables. Where possible avoid running the
cable near inductive equipment.
Sintered Metal Filter
All units less than 500 psi include a small
metal sintered filter at the top of the unit.
This is necessary to equalize the internal
pressure with atmospheric pressure but
can be a point of moisture ingress.
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)
10
1000
800
600
400
200
0
20 30 36
Operating
Region
30 Vdc max for
Intrinsically Safe
Installations
Loop Supply Voltage (Vdc)
Loop Supply Voltage vs. Loop Resistance
Loop Resistance (Ohms)
+
+
–
POWER
SUPPLY
(+)
(–)
TRANSDUCER
–
V+
V–
PIN 1
PIN 2
4-20mA
METER
OR OTHER DE
VICE
+
+
–
–
POWER
SUPPLY
METER
OR OTHER DEVICE
TRANSDUCER
(Common)
(+ Power)
(+ Output)
PIN 1
PIN 2
PIN 3
3-Wire Voltage
A2X Wiring Diagrams
A2X transducer has internal transient
protection: for safety, limit line-to-
ground voltage to 36 Vdc max.
HAZARDOUS AREA CERTIFICATIONS
Explosion Proof* – cUL: Specify A2X
Class I, Div. 1 & 2, Groups A, B, C and D
Class II, Div. 1 & 2, Groups E, F and G
Flame Proof* – ATEX: Specify A2X
Compliance with standards
EN 60079-0: 2012
and
EN 60079-1: 2007
II 2 G
Ex d IIC T4 Gb
-40°C ≤ Tamb. ≤ 125°C
DEMKO 04 ATEX 0237942
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.1 and 2, Groups A,
B, C, D, F and G, no
barriers needed
* Model A2X enclosure is intended for
installation using metallic conduit and
requires installer to comply with appro-
priate codes to complete proper instal-
lation to meet the assigned hazardous
area designation.
.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), (C5)
ELECTRICAL TERMINATION FOR
WELDED HOUSINGS ONLY
INCLUDING EXPLOSION PROOF
1.062
C
D
B
A
Wire Voltage Current
Color Output Output
Red (+) Power (+) Power
White (+) Output None
Black (-) Power (-) Power
Wire Voltage Current
Color Output Output
Red (+) Power (+) Power
White (+) Output None
Black (-) Power (-) Power
.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), (C5)
ELECTRICAL TERMINATION FOR
WELDED HOUSINGS ONLY
INCLUDING EXPLOSION PROOF
1.062
C
D
B
A
SHIELDED CABLE (PIG TAIL)
ELECTRICAL TERMINATION
CONDUIT - 1/2NPT MALE
(C1), (C6), (C7), (P7)
* Installation of conduit leads should be limit-
ed to 3m to maintain CE compliance