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MODEL CXLdp DIFFERENTIAL

PRESSURE TRANSDUCER

INSTALLATION & MAINTENANCE SHEET

Set Up:

Note: For best immunity from EMI the pressure

connection fittings on the CXLdp should not be

grounded.

The transducers 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 trans-

ducer. The barbed connection accept

tubing.

(see Figure 5)

Figure 5

When

⁄

NPT female

brass fittings are

used, do not ex-

ceed 60 inch-pound

torque force on fe-

male NPT fitting.

When connecting

to the NPT fittings,

do not apply torque

to the CXLdp fitting.

Use a

⁄

˝ wrench to

Figure 6

1 6

hold the CXLdp. (see

Figure 6)

Zero potentiometer

adjustment requires

using a

⁄

˝ or 2.5mm

3 2

slotted or phillips

screwdriver. The

tubing should

remain in place until the transducer is to be con-

nected to the BCS tubing system.

(see Figure 7)

Zero and Span Potentiometers

Figure 7

ZERO

Zero adjust

potentiometer

Routine Maintenance:

The CXLdp is a very stable and reliable transducer

incorporating a proven, micro-machined silicon

capacitive sensor and a new, state-of-the-art appli-

⁄

˝ O.D.

⁄

˝ I.D.

cation specific integrated circuit (ASIC).

All calibration and temperature compensation func-

tions are done with a microprocessor and

digital routines.

To troubleshoot or verify performance, it is rec-

ommended to pneumatically connect the pressure

ports to each other and establish a zero offset read-

ing 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 Transducer Removal:

In order to remove the transducer when it is installed

on a DIN rail, it is necessary to first unplug the wiring

terminal block from the transducer .

Insert a small slot-

ted screwdriver into

the black plastic clip

extending slightly

below the trans-

mitter 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 Per-

sonnel can be contacted at (203) 378-8281 or visit

our website at www.ashcroft.com.

SPAN

Span adjust

potentiometer

0.16˝

0.56˝

Figure 8

GENERAL DIMENSIONS FOR

MODEL CXLdp (in inches)

MB2

⁄

˝ BARB FITTINGS

"B2" ¼ BARB FITTINGS

1.45˝

0.20˝

POWER

3.30˝

2.90˝

ZERO

SPAN

1.89˝

F01

⁄

NPT FEMALE FITTINGS

"01"

⁄

FEMALE NPT FITTINGS

1.45˝

POWER

3.30˝

ZERO

SPAN

2.90˝

1.89˝

ASSEMBLED WITH 101A213-01

CONDUIT KIT

ASSEMBLED WITH 101A213-01 CONDUIT KIT

4.85

0.16˝

2.06

R R .88 .88

.78 .78

0.37˝

1.32˝

HOUSING TABS (2)

0.37˝

1.32˝

HOUSI