MODEL IXLdp TRANSDUCER
INSTRUCTION SHEET
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. 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
observe the following:
• Ground the body of the transducer
BEFORE making any electrical connections.
• When disconnecting, remove the ground
LAST!
Note: The shield and drain wire in the cable
(if supplied) is not connected to the transducer body, and is not a suitable ground.
DESCRIPTION
The Industrial Low Pressure Differential
Transducer consists of a silicon diaphragm
supported between two layers of metallized
glass. The Si-Glas technology combines the
inherent high sensitivity of a variable capacitance trans ducer using a micro-machined, single crystal diaphragm which provides excellent
stability and repeatability.
The transducer should be used with clean, dry
air or other dry non-corrosive gases. Both
unidirectional (e.g. 0/1.0 in. W.C.) and bidirectional (e.g. +/– 5.0 in. W.C.) pressure ranges
are offered as well as a wide selection of output signals.
The storage temperature limits of the transducer are –40 to 210°F. The unit can operate
between –20 and 185°F and is temperature
compensated between 0 and 160°F.
MOUNTING
The unit should be mounted with #8 or #10
screws using the three mounting feet provided
(see Fig. 1). Easy access to the covers 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. (See the Calibration section for more
details on the zeroing procedure.)
PIPING
The “high” and “low” pressure connection ports
are plugged to avoid debris entering the unit.
The plugs should be left in place until the tubing and fittings are connected. The two 1⁄4˝ NPT
pressure connections should be sealed to the
transducer housing using teflon tape. The use
of a dope-type sealant should not be used
since it may cause measurement errors
because of outgassing.
WIRING
Voltage Output:
The IXLdp requires 12-36 VDC excitation for
operation and will draw less than 5 mA. Warmup is typically less than 15 seconds.
Current Output:
The voltage required for a 4-20mA output is
dependent upon the loop resistance of the
circuit (see Fig. 2). The voltage required is
proportional to the load (loop resistance)
being driven. Figure 2 shows the minimum
supply voltage (V
loop resistance. Warm-up is typically less
than 15 seconds.
The field wiring terminals can be accessed by
unscrewing the four cover screws and removing the terminal block access cover (see Fig.
1). Once the cover is removed, make sure no
contaminants, (e.g. water, oil, chemicals,
grease, dirt, etc.), enter the inside of the
enclosure. Feed the cable from the conduit
through one of the conduit attachment holes
into the terminal area. Connect the conduit to
the conduit connection threaded hole on the
side of the transducer. Attach the cable wires
to the appropriate terminals. The unused connection hole should be closed with a suitable
conduit plug.
The transducer should be wired with a multiconductor shielded cable. Figures 3 and 4
show how the current and voltage output
transducers should be wired. The transducer
housing should be earth grounded at the
ground screw using one of the cable’s conductors as shown in Figures 3 and 4.
When the cover is reinstalled, make sure the
gasket is seated correctly and all four screws
are properly engaged and tightened.
CALIBRATION
The zero adjustment for the transducer can be
accessed by unscrewing the four cover screws
and removing the zero pot access cover (see
Fig. 1). Once the cover is removed, make sure
) required for a given
min
no contaminants, (e.g. water, oil, chemicals,
grease, dirt, etc.), enter the enclosure. The
zero adjustment range is approximately ±10%
of span.
The offset or zero adjustment potentiometer is
shown in Figure 1. A hole is provided in the
fiber insulation board to access the pot adjustment screw. Before you adjust, make sure a
short tube is connected from the “low” port to
the “high” port of the transducer. This connection will ensure that both ports are at the same
pressure. A clockwise rotation raises the output.
DO NOT ADJUST THE SPAN
ADJUSTMENT POTENTIOMETER
Proper span calibration requires a pressure
standard three to five times more accurate
than the accuracy of the transducer.
When the cover is reinstalled, make sure the
gasket is seated properly and all four screws
are properly engaged and tightened.
SERVICE
There are no user serviceable parts inside the
transducer. Servicing should only be carried
out by factory-trained personnel. Service problems encountered in the field might be
mechanical or electrical in nature.
Mechanical problems might be attributed to
plugged or leaking pressure lines, or faulty
pressure sources.
Electrical problems might be attributed to
improper wiring, bad connections (e.g. open,
shorts, etc.), malfunctioning or improper power
supply.
PHYSICAL
Weight: approx. 2 lbs.
NEMA 4X rated enclosure
OPTIONAL FEATURES
Variable Damping
A third potentiometer, placed to the left of
the zero potentiometer, allows the user to
adjust the unit’s response time.
Multiple Range
By relocating the shunt jumper, the user can
“re-range” the unit. The unit can be reranged by a 1⁄2, 1⁄3, 1⁄4 and a 1⁄5. For example, a
unidirectional 5 in. W.C. unit can become a
2.5 in. W.C., 1.67 in. W.C., 1.25 in. W.C. or a
1.0 in. W.C. range.
© 2011 Ashcroft Inc., 250 East Main St., Stratford, CT 06614-5145, U.S.A. Tel: 203-378-8281, Fax: 203-385-0499, email: info@ashcroft.com, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M011-10062 (250-2985) Rev. A 5/11
MOUNTING
FOOT
➤
➤
➤
➤
➤
➤
➤
ø 0.2
1.4
4.31
➤
➤
➤
➤
➤
0.2 TYP
2) PLACES
MOUNTING FOOT
2.68
ACCESS COVER (TERMINAL BLOCK)
➤
➤
MOUNTING FOOT
SPAN POT
ZERO POT
LOCATION
➤
➤
➤
➤
➤
➤
2.7
4.6
➤
➤
0.7
➤
➤
5
➤
1/2 NPSM THREAD TYP BOTH
SIDES FOR CONDUIT PIPING
ACCESS COVER
(ZERO AND SPAN POTS)
3
➤
➤
➤
➤
2.5
➤
➤
➤
➤
➤
➤
➤
➤
0.8
1.34
3.0
0.7
HIGH
LOW
1/4 NPT
PRESSURE
FITTINGS
➤
➤
MODEL IXLdp TRANSDUCER
OPERATING
REGION
LOOP SUPPLY VOLTAGE (VDC)
0
10
12 20 30 36
40
1250
1045
1000
750
500
250
0
LOOP RESISTANCE (OHMS)
LOAD LIMITATION 4-20mA OUTPUT ONLY
EARTH
GROUND
POWER
SUPPLY
V+
V–
RS
(LOAD)
EARTH
GROUND
SIGNAL
OUT
+
–
V+
V-
POWER
SUPPLY
INSTRUCTION SHEET
Figure 2. Loop Supply Voltage vs. Loop Resistance
V
= 12 + (.022A x RL)
min
R
= RS+ RW
L
R
= Loop Resistance (ohms)
L
R
= Sense Resistance (ohms)
S
R
= Wire Resistance (ohms)
W
*INCLUDES A 10% SAFETY FACTOR
Figure 1.
General Dimensions (INCHES)
Current (4-20mA) Output Wiring
© 2011 Ashcroft Inc., 250 East Main St., Stratford, CT 06614-5145, U.S.A. Tel: 203-378-8281, Fax: 203-385-0499, email: info@ashcroft.com, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M011-10062 (250-2985) Rev. A 5/11
Figure 3.
Figure 4.
Voltage Output Wiring
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