Ashcroft CXLdp Instruction Manual

MODEL CXLdp DIFFERENTIAL
PRESSURE TRANSDUCER
INSTALLATION & MAINTENANCE SHEET
© 2022 Ashcroft Inc. 250 East Main 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. (cxldp_transducer_i&m_(011-10130)_RevF_12-16-22
Follow the terminal block label markings on the
CXLdp to identify the terminals;
• 4-20 mA Ouput: The left, negative (-), and
right, positive (+) terminals are used, ignore
the center terminal which is not used. Connect
the power supply positive lead to the CXLdp
Reverse Wiring Protected
Electrical Connection: Euro-style terminal block
accepts 12-26 AWG
Operating Temperature: 0-160 °F (-18-71 °C)
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 mount-
ing bracket and
cover available as
separately ordered
kit – part number
101A213-01.
(see Figure 2)
INSTALLATION
Mounting:
The transducer
can be mounted
on a 35 mm DIN
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 shielded 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
transducer .
3. Available electrical versions are:
a.) CURRENT 4-20 mA; black terminal block.
b.) VOLTAGE 0-5 Vdc/0-10 Vdc; green terminal
block.
Vmin = 12V+ [.022A*(RL)]
*includes a 10% safety factor
RL = RS + RW
RL = Loop Resistance (ohms)
RS = Sense Resistance (ohms)
RW = Wire Resistance (ohms)
Figure 1 Load Limitations 4-20 mA Output
TING
Loop Resistance (Ω)
Loop Supply Voltage (Vdc)
* F.S. pressure is equivalnt to the span of the transducer (16 mA).
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. Consult
Ashcroft Inc., Stratford, Connecticut, USA before
installing if there are any questions or concerns.
2. OVERPRESSURE:
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. STATIC ELECTRICAL CHARGES:
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.
DESCRIPTION
The Ashcroft®Model CXLdp is a low differential
pressure transducer to be used on clean, dry,
non-corrosive gases. It is available in multiple
accuracy classes. Both unidirectional
(e.g. 0 to +1.0 IW) or bi-directional (e.g. ±2.0 IW)
models are available. A green LED located on the
front of the transducer indicates power and
operational status. The LED light intensity increases
as pressure increases.
SPECIFICATIONS
Accuracy: (4) options,specified at time of order.
• ±1.0% of Span
(±0.16 mA for 4-20 mA output units)
(±0.1V for 0-10 Vdc output units)
or
• ±0.8% of Span
- (±0.128 mA for 4-20 mA output units)
- (±0.08V for 0-10 Vdc output units)
or
• ±0.4% of Span
- (±0.064 mA for 4-20 mA units)
- (±0.04V for 0-10 Vdc output units)
or
• ±0.25% of Span
- (±0.04 mA for 4-20 mA units)
(±0.025V for 0-10 Vdc output units)
Output Signal: Specified at time of order.
• 4-20 mA (For symmetric bidirectional ranges 0IW
= 12 mA
or
• 0-10 Vdc; 0-5 Vdc User selectable option
(For symmetric bidirectional ranges 0IW = 5 or
2.5 Vdc respectively).
Supply Voltage:
• 4-20 mA: 12-36 Vdc (no regulation required)
(see Figure 1)
or
• 0-10 Vdc: 14-36 Vdc or 24 Vac (± 20%) or 0-5
Vdc (user selectable options): 11.5-36 Vdc or
24 Vac (±20%)
• Supply Current: 6 mA for 10 Vdc output
(4.5 mA for 5 Vdc output option)
positive terminal, connect the negative power
supply lead to the negative terminal of the BCS
4-20 mA input. Last, connect the (-) negative
terminal on the CXLdp to the (+) positive BCS
input.
– +
+
––
+
POWER
SUPPLY
BCS
SPAN
ZERO
Zero adjust
potentiometer Span adjust
potentiometer
• 0-10 Vdc; 0-5 Vdc Output: Follow label mark-
ings for terminal assignments; COM is for
Common (supply and output negative), VIN
is for supply positive and VOUT is for output sig-
nal. The CXLdp Voltage Output 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 follow-
ing. Access the jumper by simultaneously
pushing both housing tabs away from the
housing, see drawings under “General
Dimensions” for details. Change jumper
(orange or red)
into position as
shown below,
carefully reattach
housing cover.
When finished
mark check box
on front label
indicating that the
unit now provides
a 0 – 5 Vdc output.
4. Firmly reinstall the ter-
minal block plug to its
mating connector.
0-10 Vdc
0-5 Vdc
Label Part No. 238A713-01
1.250˝
1.500˝
Figure 4 Jumper
(orange
or red)
SPAN
ZERO
+
–
POWER SUPPLY
V
Out Vin (V+, Supply)
Common (V–)
Zer
o adjust
potentiometer
Span adjust
potentiometer

MODEL CXLdp DIFFERENTIAL
PRESSURE TRANSDUCER
INSTALLATION & MAINTENANCE SHEET
© 2022 Ashcroft Inc. 250 East Main 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. (cxldp_transducer_i&m_(011-10130)_RevF_12-16-22
GENERAL DIMENSIONS FOR
MODEL CXLdp (in inches)
Set Up:
Note: For best immunity from EMI the pressure
connection fittings on the CXLdp should not be
grounded.
The transducers are calibrated at the factory in the
vertical position. Mounting in the horizontal position
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, pneumatically
connect the high and low pressure connections
together using the tubing provided with the trans-
ducer. The barbed connection accept 1⁄4˝ O.D. 1⁄8˝ I.D.
tubing.
(see Figure 5)
When 1⁄8NPT female
brass fittings are
used, do not ex-
ceed 60 inch-pound
torque force on fe-
male NPT fitting.
When connecting
to the NPT fittings,
do not apply torque
to the CXLdp fitting.
Use a 9⁄16˝ wrench to
hold the CXLdp. (see
Figure 6)
Zero potentiometer
adjustment requires
using a 3⁄32˝ or 2.5mm
slotted or phillips
screwdriver. The
tubing should
remain in place until the transducer is to be con-
nected to the BCS tubing system.
(see Figure 7)
Figure 5
Figure 6
Routine Maintenance:
The CXLdp is a very stable and reliable transducer
incorporating a proven, micro-machined silicon
capacitive sensor and a new, state-of-the-art appli-
cation specific integrated circuit (ASIC).
All calibration and temperature compensation func-
tions are done with a microprocessor and
digital routines.
To troubleshoot or verify performance, it is rec-
ommended to pneumatically connect the pressure
ports to each other and establish a zero offset read-
ing 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 Transducer Removal:
In order to remove the transducer when it is installed
on a DIN rail, it is necessary to first unplug the wiring
terminal block from the transducer .
Insert a small slot-
ted screwdriver into
the black plastic clip
extending slightly
below the trans-
mitter case. (see
Figure 8)
Next, raise the
screwdriver handle
up thereby forcing
the spring clip
down.
If questions or concerns need to be addressed, our
Low Pressure Product Manager or Engineering Per-
sonnel 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 Span Potentiometers
“B2” ¼ BARB FITTINGS
HOUSING TABS (2)
POWER
HI LO
0.20˝
ZERO SPAN
0.16
˝
1.45˝
1.89˝
2.90˝
3.30˝
0.37˝
1.32˝
“01” 1⁄8FEMALE NPT FITTINGS
HOUSING TABS (2)
HI LO
0.56˝
ZERO SPAN
0.16˝
1.45˝
1.89˝
2.90˝
3.30˝
POWER
0.37˝
1.32˝
MB2 1 ⁄ 4˝ BARB FITTINGS
F01 1 ⁄ 8NPT FEMALE FITTINGS
4.85
4.85
2.06
2.06
ASSEMBLED WITH 101A213-01 CONDUIT KIT
.78
.78
R
R
.88
.88
ASSEMBLED WITH 101A213-01
CONDUIT KIT