Ashcroft RXLdp User Manual
MODEL RXLdp
OPERATING
REGION
LOOP SUPPLY VOLTAGE (VDC)
0
10
12 20 30 36
40
1250
1045
1000
750
500
250
0
LOOP RESISTANCE (OHMS)
INSTRUCTION SHEET
m m
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 pressure containing parts, or other misuse. Consult
Ashcroft Inc., Stratford, Connecticut,
USA before installing if there are any
questions or concerns.
2. OVER PRESSURE:
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 RXLdp is a low
differential pressure transducer to
be used with clean, dry air and other
noncorrosive gases. Both unidirectional
(e.g., 0/1.0 in. W.C.) and bidirectional
(e.g., ±3.0 in. W.C.) pressure ranges
are offered, as well as a wide selection
of output signals. The storage temperature limits of the RXLdp are from –40
to 180°F. The unit operates between 0
and 160°F and is temperature compensated between 40 and 125°F.
Mounting
The unit should be mounted with #6
or #8 screws using the two mounting
holes provided. Easy access to the zero
adjustment may be a consideration
when mounting. The transducer can be
mounted in any orientation with virtually
no effect on calibration. Any minor zero
pressure offsets that are encountered
can be adjusted using the zero adjust
potentiometer.
Piping
The two pressure connections are protected with tubing to avoid debris entering the unit. It should be left in place until
system tubing is to be connected. The
Ashcroft Model RXLdp can withstand
overpressure or vacuum up to 15 psi
without requiring a recalibration.
Recommended flexible tube sizes should
be as follows:
1/4 barb: <
1/8 barb: <
3
⁄16˝ ID tube
1
⁄16˝ ID tube
Power Requirements
Voltage Output:
The Model RXLdp will operate on any
unregulated supply voltage from 12-36
Vdc (24 Vdc typical) and will draw less
than 5mA.
Current Output:
The voltage required for 4-20mA output
is dependent on the loop resistance of
the circuit. The figure below shows the
minimum supply voltage (V
for a given Loop Resistance (R
) required
min
).
L
Load Limitations 4-20mA
V
= 12 + (.022A x RL)
min
R
= RS+ R
L
R
= Loop Resistance (ohms)
L
R
= Sense Resistance (ohms)
S
W
Electrical Connections
1. With pressure connection options
(With Case)
1
F01
MB2
MB8
8
⁄
NPT female
1
4
⁄
barbed
1
8
⁄
barbed
A. Voltage Output
OUT
+
–
+
–
POWER
SUPPLY
B. Current Output
+
POWER
–
R
S
SUPPLY
© 2011 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M 011-10071 (250-3117). Rev. B 11/11
MODEL RXLdp
INSTRUCTION SHEET
Electrical Connections
2. With pressure connection option MB1
(No Case)
A. Voltage Output
B. Current Output
General Dimensions (IN INCHES)
1.6
2.8
➤
➤
➤
0.9
➤
➤
1.1
➤
Ø 0.14
➤
➤
➤
➤
➤
➤
1.7
➤
➤
0.6
➤
3.7
➤
➤
2.8
3.8
➤
2.2
3.3
➤
0.6
➤
➤
➤
➤
➤
Ø 0.20
➤
0.4
➤
➤
➤
➤
➤
➤
2.3
1.1
➤
➤
© 2011 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M 011-10071 (250-3117). Rev. B 11/11
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