Ashcroft XLdp User Manual

MODEL XLdp

Loop Resistance

(Ω)

Loop Supply Voltage (VDC)

0 10 12 20 30 36 40

0

250

500

750

1000

1250

OPERATING

REGION

1090

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 temper-

ature, corrosion of the pressure con-

taining 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 the operator/installer
should follow proper ESD (electrostatic
discharge) protection procedures before

handling the pressure transducer.

Description

The Ashcroft Model XLdp is a low pres­sure differential pressure transducer to

be used with clean, dry air and other
non-corrosive gases. Both unidi rectional
(e.g. 0/1.0 in. W.C.) and bidire ctional (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 XLdp are from –40 to 180°F.
The unit can operate be tween –20 and
160°F and is temperature compensated
between 35 and 135°F.

A space on the label is provided for
a grease pencil marking. This marking
can identify each unit with a piece of
equipment that it is monitoring. This will
help to avoid tracing the pressure lines.

Mounting

The unit should be mounted with #8
or #10 screws using the two mount­ing slots 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 during installation. It should be

left in place until system tubing is to be

connected. The Ashcroft Model XLdp can

withstand overpressure or vacuum of up
to 15 psi without requiring recalibration.

Recommended exible 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 XLdp will operate on any
supply voltage from 12-36 VDC (24
VDC typical) drawing less than 5mA.

Current Output:

The voltage required for a 4-20mA out­put is dependent on the loop resistance

of the circuit. (See gure on electrical
connections.) The Loop Resistance
Chart shows the minimum supply volt­age (V

min) required for a given Loop

Resistance (R

).

L

CE Options:

Available in 4-20mA output units
using XCE variation. Compliant to

EN61326:1997 Annex A.

V min = 12 + (.022A x RL)

RL = RS+ R

R

L

RS = Sense Resistance (ohms)

R

W

W

= Loop Resistance (ohms)

= Wire Resistance (ohms)

© 2011 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614, USA • Tel: [phone], Fax: [phone] • email: [e-mail], www.ashcroft.com.

All specications subject to change without notice. All sales subject to standard terms and conditions of sale I&M 011-10070 (250-3001) Rev. B 10/11

KNURLED

BRASS NUT

MODEL XLdp
INSTRUCTION SHEET

General Dimensions (IN INCHES)

1.9

1.3

4.6

3.9

1.7

3.4

4.2

ELECTRICAL CONNECTIONS

(14-22 AWG)

VOLTAGE OUTPUT

OUT

V–

V +

OUT

+

–

CURRENT OUTPUT

–

SHIELD

R

S

XCE Option:

Shield must be connected at instrument only.

+

–

+

+

–

.21 Slot

for #8 or
#10 Screw

POWER
SUPPLY

POWER
SUPPLY

Ashcroft Inc.
250 East Main Street
Stratford, CT 06614
Tel: [phone]
Fax: [phone]

email: [e-mail]
www.ashcroft.com

© 2011 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614, USA • Tel: [phone], Fax: [phone] • email: [e-mail], www.ashcroft.com.

All specications subject to change without notice. All sales subject to standard terms and conditions of sale I&M 011-10070 (250-3001) Rev. B 10π/11