Ashcroft CXLdp Assembly instructions

MODEL CXLdp HIGH ACCURACY
DIFFERENTIAL PRE URE TRAN DUCER
IN TALLATION & MAINTENANCE HEET
the center terminal which is not used. Con-
nect the power supply positive lead to the
CXLdp High Accuracy positive terminal, con-
nect the negative power supply lead to the
negative terminal of the BCS 4-20mA input.
Enclosure:
NEMA 1 Fire-retardant ABS Meets UL 94-5VA
Weight: Approx. 2.5 oz.
Pressure Connection Options:
1⁄4˝ Brass Barbs or
1⁄8NPT Female Brass
Optional: 1⁄2˝ conduit
or plenum mounting
bracket and cover
available as sepa-
rately ordered kit –
part number
101A213-01.
(see Figure 2)
IN TALLATION
Mounting:
The transmitter
can be mounted
on a 35 mm D N
rail or with #8 or
#10 screws using
the 4 mounting
holes provided.
Torque limits on
the mounting
holes provided is
6 inch-pounds.
(see Figure 3)
Electrical Wiring:
1. The use of sheilded cable is recommended for
optimum performance. Connect the shield to the
guard terminal on the reading instrument (meter,
etc.) if available or to ground.
2. Remove the terminal block on the front of the
transmitter.
3. Available electrical versions are:
a.) CURRENT 4-20mA; black terminal block.
b.) VOLTAGE 0-5Vdc/0-10Vdc; green terminal
block.
Follow the terminal block label markings on
the CXLdp High Accuracy to identify the
terminals;
• 4-20mA Ouput: The left, negative (–), and
right, positive (+) terminals are used, ignore
© 2014 Ashcroft Inc. 250 East ain Street 06614, Tel: [phone] • Fax: [phone], All specifications are subject to change without notice.
All sales subject to standard terms and conditions. www.ashcroft.com All rights reserved. I& 011-10137 11/14
Vmin = 12V+ [.022A*(RL)]
*includes a 10% safety factor
RL =R
S + RW
RL = Loop Resistance (ohms)
RS = Sense Resistance (ohms)
RW= Wire Resistance (ohms)
Figure 1 Load Limitations 4-20mA Output
TING
Loop Resistance (Ω)
Loop Supply Voltage (Vdc)
* F.S. pressure is equivalnt to the span of the transmitter (16mA).
Figure 3
Green LED
Use
#10
screw
Use #8
screw
or
Zero Pot
Figure 2
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 pres-
sure containing parts, or other misuse. Con-
sult Ashcroft nc., Stratford, Connecticut, USA
before installing if there are any questions or
concerns.
2. OVERPRE URE:
Pressure spikes in excess of the rated overpres-
sure capability of the transducer may cause irre-
versible electrical and/or mechanical damage to
the pressure measuring and containing elements.
3. TATIC ELECTRICAL CHARGE :
Any electrical device may be susceptible to dam-
age when exposed to static electrical charges.
To avoid damage to the transducer the
operator/installer should follow proper ESD
(electrostatic discharge) protection procedures
before handling the pressure transducer.
DE CRIPTION
The Ashcroft®Model CXLdp High Accuracy is a
low differential pressure transmitter to be used on
clean, dry, non-corrosive gases. t is available in
two accuracy classes and its performance is trace-
able to the U. S. National nstitute of Standards and
Technology (N ST). The 3 located in the third posi-
tion distinguishes a 0.25% transmitter. Both unidi-
rectional (e.g. 0 to +1.0 W) or bi-directional (e.g.
±2.0 W) models are available. A green LED located
on the front of the transmitter indicates power and
operational status. The LED light intensity increases
as pressure increases.
PECIFICATION
Accuracy:
• ±0.25% span
- (±0.04mA for 4-20mA output units)
- (±0.025V for 0-10Vdc output units
Output ignal: Specified at time of order.
• 4-20ma (For symmetric bidirectional ranges
0 W= 12mA
or
• 0-10Vdc; 0-5Vdc User selectable option (For
symmetric bidirectional ranges 0 W= 5 or
2.5Vdc respectively).
upply Voltage:
• 4-20mA: 12-36 Vdc (no regulation required)
(see Figure 1)
or
• 0-10Vdc (0-5Vdc User selectable option):
14-36 Vdc or 24 Vac (+/- 20%)
• Supply Current: 6mA (4.5mA for 5Vdc
output option)
Reverse Wiring Protected
Electrical Connection: unpluggable terminal block
accepts 12-26 AWG
Operating Temperature: 0-160°F

– +
+
––
+
POWER
SUPPLY
BCS
SPAN
ZERO
Last, connect the (–) negative terminal on the
CXLdp High Accuracy to the (+) positive BCS
input.
Zero adjust
potentiometer Span adjust
potentiometer
• 0-10Vdc; 0-5Vdc Output: Follow label mark-
ings for terminal assignments; COM is for
Common (supply and output negative), V N
is for supply positive and VOUT is for output
signal. The CXLdp High Accuracy Voltage Out-
put unit is supplied as standard with 0-10 V
output, to convert to 0-5 V output see
following instructions.
- 0-10 Vdc Output: Product is supplied as
standard with 0-10 V output, see instruction
below to access the Voltage Output jumper.
- 0-5 Vdc Output: See below for proper
jumper selection. To convert the unit from a
0-10 V output to a 0-5 V output unit note the
following. Access the jumper by simultane-
ously pushing both housing tabs away from
the housing, see drawings under “General
Dimensions” for
details. Change
jumper (orange)
into position as
shown below,
carefully reattach
housing cover.
When finished
mark check box
on front label in-
dicating that the
unit now provides
a 0-5Vdc output.
4. Firmly reinstall the terminal block plug to its
mating connector.
0-10 Vdc
0-5 Vdc
Label Part No. 238A713-01
Figure 4
Jumper
(orange)
SPAN
ZERO
+
–
POWER SUPPLY
V
Out Vin (V+, Supply)
Common (V–)
Zero adjust
potentiometer
Span adjust
potentiometer

MODEL CXLdp HIGH ACCURACY
DIFFERENTIAL PRE URE TRAN DUCER
IN TALLATION & MAINTENANCE HEET
1.45
2.90
.20
.16
3.33
1.89
"B2" 1/4 BARB FITTINGS
1.32
.37
POWER
HI LO
SPAN
ZERO
HOUSING TABS (2)
1.45
2.90 3.33
1.89
"01" 1/8 FEMALE NPT FITTINGS
1.32
.37
POWER
HI LO
SPAN
ZERO
.56
MB2 1 ⁄ 4˝ BARB FITTINGS
F01 1 ⁄ 8NPT FEMALE FITTINGS
GENERAL DIMEN ION FOR
MODEL CXLDP HIGH ACCURACY (in inches)
4.854.85
2.062.06
ASSEMBLED WITH 101A213-01 CONDUIT KIT
.78.78
RR.88.88
ASSEMBLED WITH 101A213-01
COND IT KIT
et Up:
Note: For best immunity from EM the pressure
connection fittings on the CXLdp High Accuracy
should not be grounded.
The transmitters are calibrated at the factory in the
vertical position. Mounting in the horizontal posi-
tion can cause a zero shift of as much as ±1% F.S.
in ranges below 1 IW dp. Any minor zero offset can
be minimized using the zero adjust potentiometer
located on the front, left side of the instrument.
To find true zero differential pressure, pneumati-
cally connect the high and low pressure connec-
tions together using the tubing provided with the
transmitter. The barbed connection accept 1⁄4˝ O.D.
1⁄8˝ .D. tubing.
(see Figure 5)
When 1⁄8NPT fe-
male brass fittings
are used, do not
exceed 60 inch-
pound torque force
on female NPT fit-
ting.
When connecting
to the NPT fittings,
do not apply torque
to the CXLdp High
Accuracy fitting. Use
a 9⁄16˝ wrench to hold
the CXLdp. (see
Figure 6)
Zero potentiometer
adjustment requires
using a 3⁄32˝ or 2.5
mm slotted or
phillips screwdriver. The tubing should remain in
place until the transmitter is to be connected to the
BCS tubing system.
(see Figure 7)
Figure 5
Figure 6
Routine Maintenance:
The CXLdp High Accuracy is a very stable and
reliable transmitter incorporating a proven, micro-
machined silicon capacitive sensor and a new,
state-of-the-art application specific integrated
circuit (AS C). All calibration and temperature com-
pensation functions are done with a microprocessor
and digital routines.
To troubleshoot or verify performance, it is recom-
mended to pneumatically connect the pressure
ports to each other and establish a zero offset
reading in the as-installed position. Adjusting zero
will not affect span calibration.
Adjusting span should only be attempted when a
high accuracy pressure standard and high quality
electrical meter are able to be used.
DIN Rail Transmitter Removal:
n order to remove the transmitter when it is installed
on a D N rail, it is necessary to first unplug the wiring
terminal block from the transmitter.
nsert a small slot-
ted screwdriver into
the black plastic
clip extending
slightly below the
transmitter case.
(see Figure 8)
Next, raise the
screwdriver handle
up thereby forcing
the spring clip down.
f questions or concerns need to be addressed, our
Low Pressure Product Manager or Engineering
Personnel can be contacted at [phone] or
visit our website at www.ashcroft.com.
Figure 8
Figure 7
SPAN
ZERO
Zero adjust
potentiometer Span adjust
potentiometer
Zero and pan Potentiometers
© 2014 Ashcroft Inc. 250 East ain Street 06614, Tel: [phone] • Fax: [phone], All specifications are subject to change without notice.
All sales subject to standard terms and conditions. www.ashcroft.com All rights reserved. I& 011-10137 11/14