Ashcroft A4 - Pressure Transmitter - Manual

A4 INTRINSICALLY SAFE &
NON-INCENDIVE RATED
PRESSURE TRANSMITTER
INSTRUCTION SHEET
.50
3.065
4.45
.885
1.06
DIA.
1.06 Hex.
Common For All
Pressure Fittings
Cable style
electrical
termination
Threaded Male Process Connection
Ashcroft ® A4 Pressure Transmitter, Typical Dimensions and Construction*
Enclosure Option “S” Enclosure Option “W”
* Dimensions and construction details may vary based on product specified.
Conduit style
electrical
termination
© 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&M011-10166-A4. Rev. 12/12
WARNING! READ
BEFORE INSTALLATION
1. GENERAL:
A failure resulting in injury or damage
may be caused by excessive over-
pressure, excessive vibration or
pressure pulsation, excessive instru-
ment 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 ham-
mer occurs when a liquid flow is sud-
denly stopped, as with quick closing
solenoid valves. Surges occur when
ƽ ƽ
.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)
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
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 out-
put 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 suscepti-
ble to damage when exposed to static
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 suit-
able 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.