Ashcroft CXLdp INSTALLATION & MAINTENANCE SHEET
MODEL CXLdp DIFFERENTIAL
0
10
12 20 30 36
40
1250
1091
1000
750
500
250
0
OPERATING
REGION
PRESSURE TRANSDUCER (4-20mA)
INSTALLATION & MAINTENANCE SHEET
DESCRIPTION
The Ashcroft
®
Model CXLdp is a low differential pressure transmitter to be
used on clean, dry, non-corrosive gases. It is available in two accuracy
classes and its performance is traceable to the U. S. National Institute of
Standards and Technology (NIST). The 8 or 4 located in the third position
of the product code distinguishes a 0.8% from a 0.4% accuracy transmitter. 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 transmitter
indicates power and operational status. The LED light intensity increases as
INSTALLATION
Mounting:
The transmitter 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 inchpounds. (see Figure 3)
pressure increases.
Specifications
Accuracy: ±0.8% F.S.* or ±0.128 mA,
±0.4% F.S. or ±0.064 mA
Output Signal: 4-20 mA, For Bidirectional Ranges 0 IW = 12 mA
Safe Overpressure: 15 psi
Supply Voltage: 12-36 VDC (no regulation required (see Figure 1)
Electrical Wiring:
1. Remove the black terminal block on the front of the transmitter.
2. Following the markings on the transmitter label to identify the left, nega-
tive (-) and right, positive (+) terminals. (Ignore the center terminal
which is not used.) Connect the power supply positive lead to the posi-
Figure 1 Load Limitations 4-20mA Output
Loop Resistance (Ω)
tive terminal on the plug. Connect the negative power supply lead to the
negative terminal BCS 4-20 mA input. Last, connect the (-) negative terminal on the CXLdp to the (+) positive BCS input.
3. Firmly reinstall the terminal block plug to its mating connector.
Set Up:
The transmitters 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
V
= 12V+ [.022A*(RL)]
min
*includes a 10% safety factor
+ R
R
L =RS
W
RL = Loop Resistance (ohms)
= Sense Resistance (ohms)
R
S
R
= Wire Resistance (ohms)
W
Loop Supply Voltage (Vdc)
Reverse Wiring Protected
Electrical Connection: unpluggable terminal block accepts 12-26 AWG
Operating Temperature: 0-160°F
Enclosure: NEMA 1 Fire-retardant ABS Meets UL 94-5VA
Weight: Approx. 2.5 oz.
Pressure Connection Options:
1
⁄4˝ Brass Barbs or 1⁄8 NPT Female Brass
and low pressure connections
together using the tubing provided
with the transmitter. The barbed
connection accept
tubing. (see Figure 4)
1
When
⁄8 NPT female brass fittings
are used, do not exceed 60 inchpound torque force on female 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 5)
Zero potentiometer adjustment
requires using a
1
Optional:
⁄2˝ conduit or plenum
mounting bracket and cover available
as separately ordered kit – part number 101A213-01.
(see Figure 2)
Figure 2
ted or phillips screwdriver. The tubing should remain in place until the
transmitter is to be connected to the
BCS tubing system.
Routine Maintenance:
The CXLdp is a very stable and
reliable transmitter incorporating a
proven, micro-machined silicon capacitive sensor and a new, state-of-theart application specific integrated circuit (ASIC). All calibration and temperature compensation functions are done with a microprocessor and digital
routines.
* F.S. pressure is equivalnt to the span
of the transmitter (16mA).
© Copyright 2006. Ashcroft Inc. 250 East Main Street 06614, Tel: 203-378-8281 • Fax: 203-378-0499, All specifications are subject
to change without notice. All sales subject to standard terms and conditions. www.ashcroft.com, All rights reserved. I&M011-10130 GBE 1M 1/06
1
⁄4˝ O.D. 1⁄8˝ I.D.
3
⁄32˝ or 2.5 mm slot-
Figure 3
Use #10
screw
Zero Pot
Figure 4
Figure 5
or
Use #8
screw
Green LED
– +
+
––
+
POWER
SUPPLY
BCS
MODEL CXLdp DIFFERENTIAL
4.85
2.06
.78
.88
PRESSURE TRANSDUCER (4-20mA)
INSTALLATION & MAINTENANCE SHEET
To troubleshoot or verify performance, it is recommended 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:
In order to remove the transmitter when it is installed on a DIN rail, it is necessary to first unplug the wiring terminal block from the transmitter.
Insert a small slotted screwdriver
into the black plastic clip extending
Figure 6
slightly below the transmitter case.
(see Figure 6)
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
Personnel can be contacted at (203)
378-8281 or visit our website at
www.ashcroft.com.
WIRING DIAGRAM FOR MODEL CXLdp
GENERAL DIMENSIONS FOR MODEL CXL
MB2 1⁄
4˝ BARB FITTINGS
"B2" 1/4 BARB FITTINGS
1.45
Ø.20
POWER
HI LO
ZERO
Ø.16
F01 1⁄
.56
HI LO
ZERO
SPAN
2.90
1.89
8 NPT FEMALE FITTINGS
"01" 1/8 FEMALE NPT FITTINGS
1.45
POWER
SPAN
2.90 3.33
ddpp
(in inches)
3.33
.37
1.32
.37
1.32
Zero adjust
potentiometer
ZERO
SPAN
Span adjust
potentiometer
1.89
ASSEMBLED WITH 101A213-01 CONDUIT KIT
ASSEMBLED WITH 101A213-01 CONDUIT KIT
4.85
2.06
R .88
.78
© Copyright 2006. Ashcroft Inc. 250 East Main Street 06614, Tel: 203-378-8281 • Fax: 203-378-0499, All specifications are subject
to change without notice. All sales subject to standard terms and conditions. www.ashcroft.com, All rights reserved. I&M011-10130 GBE 1M 1/06
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