A2 PRESSURE TRANSMITTER
.50
3.065
4.45
2.200
.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)
INSTRUCTION SHEET
WARNING! READ
BEFORE INSTALLATION
denly stopped, as with quick closing
solenoid valves. Surges occur when
low is suddenly begun, as when a
f
pump is turned on at full power or a
valve is quickly opened.
1. GENERAL:
A failure resulting in injury or dam-
ge
ay be caused by excessive
a
m
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 electri-
cal and/or mechanical damage to the
pressure measuring and containing
elements.
Fluid hammerand surges can destroy
any pressure transducer and must
always be avoided. A pressure snubber should be installed to eliminate the
damaging hammer effects. Fluid ham-
Liquid 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.
mer occurs when a liquid flow is sud-
3. STATIC ELECTRICAL CHARGES:
Any electrical device may be suscepti-
le to damage when exposed to static
b
electrical 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.
Ashcroft®A2 Pressure Transmitter, Typical Dimensions and Construction*
Enclosure Options “S” and “Z” Enclosure Option “W”
Threaded housing with zero & span access Welded housing without zero and span access
Cable style
electrical
termination
Zero and span
access sleeve
and adjustment
potentiometer
(optional)
Threaded Male Process Connection
© 2011 Ashcroft Inc. All rights reserved. 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&M011-10102-A2. Rev. 02/14
*
Dimensions and construction details may vary based on product specified.
Conduit style
electrical
termination
A2 PRESSURE TRANSMITTER
+
+
–
POWER
SUPPLY
(
+)
(–)
T
RANSDUCER
–
V+
V–
PIN 1
PIN 2
4-20mA
METER
O
R OTHER DEVICE
+
+
–
–
POWER
SUPPLY
METER
OR OTHER DEVICE
TRANSDUCER
(Common)
(+ Power)
(+ Output)
PIN 1
PIN 2
PIN 3
3-Wire Voltage
.062
Z S
Z S
“Z” and “S” pots
INSTRUCTION SHEET
Mounting
The A2 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
0-5Vdc 10V 30V
1-5Vdc 10V 30V
1-6Vdc 10V 30V
0-10V 14V 30V
4-20mA 12V* 36V
* For transmitters with 4-20mA output
signal, 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
800
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.
hielded Cable
S
Units with shielded cable electrical termination, 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.
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.
A2 Wiring Diagrams
rical termination end of the unit (see
t
diagram on front page).
To gain access to the zero and span
djustment pots, slide the access
a
sleeve upward toward the connector.
On the label there is a “Z” and “S” to
ndicate zero and span. (Looking at the
i
A2 vertically as in the diagram, zero is
on the left and the span is on the right).
sing a small trim pot adjustment tool
U
you can adjust zero ±10% of full scale
and span ±10% of full scale.
2. Top/rear access zero and span
adjustment
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.
600
400
200
Loop Resistance (Ohms)
0
10
Loop Supply Voltage (Vdc)
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)
Operating
Region
20 30
A2 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, not all A2 configurations offer Zero and Span access. 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.
1. Side access zero and span adjustment(Enclosure Options “Z,” “Y”) A2
configurations with side access “Z” and
© 2011 Ashcroft Inc. All rights reserved. 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.
“S” potentiometers (pots) have a black
plastic access sleeve towards the elec-
I&M011-10102-A2. Rev. 02/14
A2 PRESSURE TRANSMITTER
.600
(4) PIN BENDIX STYLE
ELECTRICAL TERMINATION
SHELL SIZE 8
(B4), (H1), (L1), (P2)
PROCESS
FITTING
(REF.)
1.062
1.000
C
D
B
A
.71
M12
ELECTRICAL TERMINATION
(EW), (E0), (E1), (E2)
1.320
.18
.64
DIN 43650-A
ELECTRICAL TERMINATION
(DN), (D0), (D1), (D2)
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
C
D
B
A
3
4
2
1
Key
2
1
3
Gnd.
.830
FLYING LEADS
E LE CT RI CA L TE RM IN AT IO N
CONDUIT - 1/2 NPT MALE
(C2), (C5)
1.062
.
830
1.062
INSTRUCTION SHEET
Pin #
Voltage Current
utput Output
O
A (+) Power (+) Power
B (+) Output None
C Field Gnd. Field Gnd.
D (-) Power (-) Power
Wire Voltage Current
olor Output Output
C
Red (+) Power (+) Power
White (+) Output None
Black (-) Power (-) Power
Wire Voltage Current
Color Output Output
Red (+) Power (+) Power
White (+) Output None
Black (-) Power (-) Power
SHIELDED CABLE (PIG TAIL)
ELECTRICAL TERMINATION
ONDUIT - 1/2NPT MALE
C
C1), (C6), (C7), (P7)
(
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
ELECTRICAL TERMINATIONS FOR WELDED HOUSINGS ONLY
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
Wire Voltage Current
Color Output Output
Red (+) Power (+) Power
White (+) Output None
Black (-) Power (-) Power
Green Field Gnd. Field Gnd.
© 2011 Ashcroft Inc. All rights reserved. 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&M011-10102-A2. Rev. 02/14
Ashcroft Inc.
250 East Main Street
Stratford, CT 06614-5145 USA
Tel: 203-378-8281 • Fax: 203-385-0402
Visit our web site www.ashcroft.com
Tel: 203-378-8281, Fax: 203-385-0402 www.ashcroft.com All sales subject to standard terms and conditions of sale. I&M011-10102-A2. Rev. 02/14
email: info@ashcroft.com
www.ashcroft.com
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