Ashcroft Dxldp User Manual

MODEL DXLdp DIFFERENTIAL

5.29

+

P

–P

Z

ero

S

pan

Z

ero

V+ V– Out

Test

+

–

.89

3.92

3.18

Model: DXLdp

4.96

Span

Zero

V+ V– Out

.89

3

.92

3.18

M

odel: DXLdp

PRESSURE TRANSMITTER
OPERATING & 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

f the pressure containing parts, or other

o
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
the operator/installer should follow proper
ESD (electrostatic discharge) protection
procedures before handling the pressure
transducer.

Description:

Congratulations on your purchase of the

®

Ashcroft
transmitter. The DXLdp utilizes the same highly
reliable variable capacitance sensor used in tradi­tional Ashcroft XLdp family of low differential
transmitters. A selection of both unidirectional
and bi-directional pressure ranges are offered,
accuracy’s of 1%, 0.5% and 0.25% and a wide
assortment of output signals. Refer to CT-5 spec­ification sheet for more information.

The DIN rail-mounting package offers a new and
efficient use of mounting space for enclosure
mount applications. Optional features such as the
SpoolCal™ process valve actuator, LED’s with
front access test sockets and 2:1 turn down pro­vide added value when validating a process on
line or calibrating the unit. These options are
available through suffixed (X) variations on the
part number. Contact the factory for DXLdp
upgrades.

Model DXLdp low differential pressure

Media:

The DXLdp is designed to measure clean, dry
non-corrosive gases. (Consult with factory for

se on other media). Not for use on liquids.

u

Mounting:

The unit can mount to three types of Din sizes

ncluding EN50022, EN50035 & EN50045 (not

i
included). When securing to EN50022 rail first
hook the top portion of the rear clip onto the top
of the rail and push gently into place. To remove
simply place finger behind lower rear lever and
pull forward. To remove from the EN50035 rail,
grasp the unit, push up and rotate the bottom out.
For the EN50045, pull down and rotate the bottom
out.

Multiple units can be stacked accross the rail.
Internal circuitry is vented through the bottom of
each unit. Tag holes are fabricated into the lower
rear lever and the housing below the terminal
strip for calibration reference tagging and/or ID
location. Refer to Drawing #1.

Power requirements:

The DXLdp is wired (3 wire) (2 wire) for Voltage
and Current output respectively. Reference
Drawing #2.

Voltage Output

The DXLdp will operate on any supply voltage
from 12-36Vdc drawing less than 10mA in full
function LED variations (24Vdc typical).

Current Output

The voltage required for a 4-20mA output is
dependent on the loop resistance of the circuit.
Refer to Drawing #3 showing the minimum sup­ply voltage (Vmin) required for a given Loop
Resistance (RL).

OPTIONS

The three options available include LED (XDL),
SpoolCal™ (XPV) and 2:1 Turn down (X21).

OPTION: LED RANGE INDICATION (XDL)

Provides a quick visual in/out of range status or
diagnostic indication. Not to be used for calibration
reference. This feature includes front access test
jacks for uninterrupted signal reference.

LED INDICATION

TYPICAL ACCURACY

Amber

Zero Pressure

Green

In Range Pressure

Red

Out of Range Pressure

±3% on

nominal zero

Beyond ±3% to

±106% of range

Beyond ±106%

of range

LED Activation:

Unidirectional ranges Bidirectional ranges

• Red, top & bottom LED • Red, top & bottom LED

• Green, top LED • Green, top & bottom LED

• Amber, center LED • Amber, center LED

S

tandard Mounting Position

DXLdp dimension with SpoolCal and LED options

DXLdp dimension for basic unit

Drawing #1

Front Access Test Jacks:

Provides on-line process reference signal or cali­bration signal without disconnecting power supply
wiring. Measurements can be made using a stan­dard multi-meter or data collection instrument.
Contact the factory for more information on the
Ashcroft ATE handheld calibrator. Reference sig­nals through the test jacks are made in series for
4-20mA output and in parallel for voltage output.
Gold plated contacts accept standard 0.08˝
microtip test leads, snapping in place for secure
measurements.

© 2011 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614, USA • Tel: [phone], Fax: [phone] • email: [e-mail], www.ashcroft.com. All specifications subject to change without
notice. All sales subject to standard terms and conditions of sale I&M011-10074 Rev A 5/11

MODEL DXLdp DIFFERENTIAL

+

–

+

–

POWER
SUPPLY

+

–

POWER
S

UPPLY

R

S

0

10

12 20 30 36

40

1

250

1091
1000

750

500

250

0

545

24

PRESSURE TRANSMITTER
OPERATING & INSTRUCTION SHEET

ELECTRICAL CONNECTIONS

Voltage Output

Current Output

Load Limitations 4-20mA Output

Loop Resistance (Ω)

V

= 12V+ [.022A*(R L)]

min

*

includes a 10% safety factor

RL = RS + R

W

RL = Loop Resistance (ohms)
RS = Sense Resistance (ohms)
RW =

Wire Resistance (ohms)

Drawing #3

Drawing #2

OPTION: SPOOLCAL™ (XPV)

The rotating process valve actuator in conjunction
with the SpoolCal™ actuator tool provides two
types of tests including Calibrate (CAL) and
Monitor (MON) through the appropriate Hi and Lo
Port of the SpoolCal actuator tool. In the (CAL)
mode the DXLdp is isolated from the process and
allows externally generated test pressure input for
calibration. In the (MON) mode the system pres­sures can be monitored with an Ashcroft ATE
Calibrator or other handheld instrument without
physically unplugging the process tubes. In this
mode an on-line measurement can be captured. In
conjunction with the (XDL) option, a reference sig­nal can also be captured without process interrup­tion.

The (XPV) option supplies a SpoolCal™ actuator
tool and 7˝ of silicon tubing. The actuator tool
identifies the above positions and tests, including
high (HI) and low (LO) differential pressure reference.

From the (OFF) position the SpoolCal™ actuator
tool can be inserted and removed. The following
tests can be performed:

Calibration (CAL):

Both zero and Span adjustment pots are non­ interactive and accessible from the front of the unit.
Note: Due to the sensing technology used rarely
are actual zero and span adjustments needed.
Zero and span pots are available on the basic unit.
Requires XDL and XPV options.

• Insert SpoolCal™ actuator tool.

• A 90-degree clockwise rotation isolates the
DXLdp from the process.

© 2011 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614, USA • Tel: [phone], Fax: [phone] • email: [e-mail], www.ashcroft.com. All specifications subject to change without
notice. All sales subject to standard terms and conditions of sale I&M011-10074 Rev A 5/11

• Apply zero pressure. This can be best produced
by shorting the HI and LO ports on the SpoolCal™
actuator tool using the silicon tubing supplied.
Verify or make zero adjustment.

• An external pressure generator can be used to
produce the required span pressure. Verify or
make span adjustment.

• Measure record signal via front access test jacks,
option (XDL).

Monitor (MON):

Provides on line or uninterrupted measurement
point capability when XPV option is again selected
in combination with the (XDL) option, including
the front access test jacks.

• Insert SpoolCal™ actuator tool

• A 90-degree counterclockwise rotation tee’s the
process to both the DXLdp sensor and out
through the SpoolCal™ actuator tool, to provide
external measurement or recording capabilities.

OPTION: 2:1 TURN DOWN (X21)

Provides optional in field scalability via internal
jumpers.

Example: Given a 1.0˝ DXLdp with 4-20mA output.
The unit can be adjusted to operate full scale at

0.5˝. In addition, the 4-20mA reference output

remains in calibration.

Steps (Following instructions on label):

1. Lay unit on right side. Remove reusable left side

label.

2. Pry off access door and discard.

3. Using needle nose pliers or twisters, move

jumper from top to bottom position.

4. Reattach label.

5. Reverse range label on face of unit.

ASHCROFT, INC.
250 EAST MAIN STREET, STRATFORD, CT 06614
TEL: [phone] • FAX: [phone]
EMAIL: [e-mail]

www.ashcroft.com