Ashcroft A2X User Manual

A2X EXPLOSION/FLAME PROOF

.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)

PRESSURE TRANSMITTER
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 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 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®A2X Pressure Transmitter, Typical Dimensions and Construction*

Conduit
electrical
termination

© 2011 Ashcroft Inc. All rights reserved. 250 East Main Street, Stratford, CT 06614 USA Tel: [phone], Fax: [phone] www.ashcroft.com
All sales subject to standard terms and conditions of sale.

Dimensions and construction details may vary based on product specified.

*

I&M011-10167-A2X. Rev. 02/14

A2X EXPLOSION/FLAME PROOF

+

+

–

POWER
SUPPLY

(+)

(–)

T

RANSDUCER

–

V+

V–

P

IN 1

P

IN 2

4-20mA

M

ETER

O

R OTHER DEVICE

+

+

–

–

POWER
SUPPLY

METER

OR OTHER DEVICE

TRANSDUCER

(Common)

(+ Power)

(+ Output)

PIN 1

PIN 2

PIN 3

3-Wire Voltage

.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

PIGTAIL

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

CONDUIT - 1/2 NPT MALE

(C1), (P7)

1.062

PRESSURE TRANSMITTER
INSTRUCTION SHEET

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
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 30V**

* For transmitters with 4-20mA output

signal, the minimum voltage at the temi­nals 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 installation requirements.

Noise

or minimum noise susceptibility, avoid

F
running the transducer’s leads in a con­duit 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.

his is necessary to equalize the internal

T
pressure with atmospheric pressure but
can be a point of moisture ingress.

A2X Wiring Diagrams

A2X transducer has internal transient
protection: for safety, limit line-to­ground voltage to 36 Vdc max.

HAZARDOUS AREA CERTIFICATIONS

Wire Voltage Current

olor Output Output

C

Red (+) Power (+) Power
White (+) Output None
Black (-) Power (-) Power

* Installation of conduit leads should be limit-

ed to 3m to maintain CE compliance

Wire Voltage Current

Color Output Output

Red (+) Power (+) Power
White (+) Output None
Black (-) Power (-) Power

Loop Supply Voltage vs. Loop Resistance

1000

30 Vdc max for

800

Intrinsically Safe
Installations

600

400

Operating

200

Loop Resistance (Ohms)

Region

0

10

20 30

36

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)

© 2011 Ashcroft Inc. All rights reserved. 250 East Main Street, Stratford, CT 06614 USA Tel: [phone], Fax: [phone] www.ashcroft.com
All sales subject to standard terms and conditions of sale.

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,

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

* Model A2X enclosure is intended for

installation using metallic conduit and
requires installer to comply with appropri­ate codes to complete proper installation
to meet the assigned hazardous area
designation.

I&M011-10167-A2X. Rev. 02/14

SHIELDED CABLE (PIG TAIL)

ELECTRICAL TERMINATION

CONDUIT - 1/2NPT MALE

(C1), (C6), (C7), (P7)