Ashcroft CXLdp User Manual

MODEL CXLdp DIFFERENTIAL
TING
– +
+
+
P
OWER
SUPPLY
BCS
SPAN
ZERO
0-10 Vdc
0-5 Vdc
Label Par t No. 238A713- 01
SPAN
ZERO
+
POWER SUPPLY
V
Out
Vin (V+, Supply)
Common (V
)
Z
ero adjust
potentiometer
Span adjust potentiometer
PRESSURE TRANSDUCER INSTALLATION & MAINTENANCE SHEET
WARNING! READ

Figure 1 Load Limitations 4-20mA Output
Loop Resistance (Ω)
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 pres­sure containing parts, or other misuse. Con­sult Ashcroft Inc., Stratford, Connecticut, USA before installing if there are any questions or
oncerns.
c
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.
3. STATIC ELECTRICAL CHARGES:
Any electrical device may be susceptible to dam­age 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 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 pressure increases.
SPECIFICATIONS
Accuracy: (2) options,specified at time of order.
• ±0.8% span
- (±0.128mA for 4-20mA output units)
- (±0.08V for 0-10Vdc output units)
or
• ±0.4% Span
- (±0.064mA for 4-20mA units)
- (±0.04V for 0-10Vdc output units)
Output Signal: Specified at time of order.
• 4-20ma (For symmetric bidirectional ranges 0IW= 12mA
or
• 0-10Vdc; 0-5Vdc User selectable option (For symmetric bidirectional ranges 0IW= 5 or
2.5Vdc respectively).
Supply 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)
© 2011 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 Rev. A 10/12
F.S. pressure is equivalnt to the span of the transmitter (16mA).
*
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
Optional:
or plenum mount­ing bracket and cover available as separately ordered kit – part number 101A213-01.
(see Figure 2)
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 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.
V
= 12V+ [.022A*(RL)]
min
*includes a 10% safety factor RL =RS + R RL = Loop Resistance (ohms) RS = Sense Resistance (ohms) RW= Wire Resistance (ohms)
Loop Supply Voltage (Vdc)
Figure 2
1
2˝ conduit
Figure 3
Zero Pot
W
Use #10
screw
or
Use #8 screw
Green LED
Follow the terminal block label markings on the CXLdp to identify the terminals;
• 4-20mA Ouput: The left, negative (-), and
right, positive (+) terminals are used, ignore
t nect the power supply positive lead to the
Z
ero adjust
p
otentiometer
S
pan adjust
potentiometer
CXLdp positive terminal, connect the negative power supply lead to the negative terminal of the BCS 4-20mA input. Last, connect the (-) negative terminal on the CXLdp to the (+) positive BCS input.
• 0-10Vdc; 0-5Vdc Output: Follow label mark-
ings for terminal assignments; COM is for Common (supply and output negative), V is for supply positive and VOUT is for output signal. 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 following. Access the jumper by simultane­ously pushing both housing tabs away from the housing, see drawings under “General Dimensions” for details. Change
Figure 4
jumper (orange) 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 – 5Vdc output.
IN
Jumper
(orange)
MODEL CXLdp DIFFERENTIAL
1
.45
2.90
ÿ
.20
ÿ
.16
3.33
1.89
"B2" 1/4 BARB FITTINGS
1
.32
.37
POWER
HI LO
S
PAN
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
Z
ERO
.
56
4.854.85
2.062.06
ASSEMBLED WITH 101A213-01 CONDUIT KIT
.78.78
RR .88.88
SPAN
Z
ERO
PRESSURE TRANSDUCER INSTALLATION & MAINTENANCE SHEET
4. Firmly reinstall the terminal block plug to its mating connector.
Set Up:
Note: For best immunity from EMI the pressure connection fittings on the CXLdp should not be grounded.
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 and low pressure connec­tions together using the tubing provided with the transmitter. The barbed connection
1
4˝ O.D. 1⁄8˝
accept
Figure 5
I.D. tubing.
(see Figure 5)
1
8 NPT fe-
When male brass fittings are used, do not exceed 60 inch­pound torque force on female NPT fit­ting.
Figure 6
When connecting to the NPT fittings, do not apply torque to the CXLdp fitting.
9
16˝ wrench to
Use a hold the CXLdp.
(see Figure 6)
3
Zero potentiometer adjustment requires using a
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)
Zero and Span Potentiometers
Figure 7
Z
ero adjust
potentiometer
Span adjust potentiometer
Routine Maintenance:
The CXLdp 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 (ASIC). All calibration and temperature compensation func­tions are done with a microprocessor and digital routines.
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
Figure 8
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.
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.
GENERAL DIMENSIONS FOR
MODEL CXLdp (in inches)
MB2 1⁄
4˝ BARB FITTINGS
F01 1⁄
8 NPT FEMALE FITTINGS
ASSEMBLED WITH 101A213-01
CONDUIT KIT
© 2011 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 Rev. A 10/12