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MODEL CXLdp HIGH ACCURACY

DIFFERENTIAL PRESSURE TRANSDUCER

INSTALLATION & MAINTENANCE SHEET

Set Up:

Note: For best immunity from EMI the pressure

connection fittings on the CXLdp High Accuracy

should not be grounded.

The transmitters are calibrated at the factory in the

vertical position. Mounting in the horizontal posi-

tion can cause a zero shift of as much as ±1% F.S.

in ranges below 1 W 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, pneumati-

cally connect the high and low pressure connec-

tions together using the tubing provided with the

transmitter. The barbed connection accept

⁄

˝ I.D. tubing.

(see Figure 5)

Figure 5

When

⁄

NPT fe-

male brass fittings

are used, do not

exceed 60 inch-

pound torque force

on female NPT fit-

ting.

When connecting

to the NPT fittings,

do not apply torque

Figure 6

to the CXLdp High

Accuracy fitting. Use

⁄

˝ wrench to hold

1 6

the CXLdp. (see

Figure 6)

Zero potentiometer

adjustment requires

using a

⁄

˝ or 2.5

3 2

mm slotted or

phillips screwdriver. The tubing should remain in

place until the transmitter is to be connected to the

BCS tubing system.

(see Figure 7)

Zero and Span Potentiometers

Figure 7

ZERO

Zero adjust

potentiometer

Routine Maintenance:

The CXLdp High Accuracy is a very stable and

reliable transmitter incorporating a proven, micro-

machined silicon capacitive sensor and a new,

⁄

˝ O.D.

state-of-the-art application specific integrated

circuit (ASIC). All calibration and temperature com-

pensation functions are done with a microprocessor

and digital routines.

To troubleshoot or verify performance, it is recom-

mended to pneumatically connect the pressure

ports to each other and establish a zero offset

reading 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 Transmitter Removal:

In order to remove the transmitter when it is installed

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

terminal block from the transmitter.

Insert a small slot-

ted screwdriver into

the black plastic

clip extending

slightly below the

transmitter 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

Personnel can be contacted at (203) 378-8281 or

visit our website at www.ashcroft.com.

SPAN

Span adjust

potentiometer

.56

Figure 8

GENERAL DIMENSIONS FOR

MODEL CXLDP HIGH ACCURACY (in inches)

MB2

⁄

˝ BARB FITTINGS

"B2" 1/4 BARB FITTINGS

1.45

ÿ .20

POWER

2.90

3.33

ZERO

SPAN

ÿ .16

1.89

F01

⁄

NPT FEMALE FITTINGS

"01" 1/8 FEMALE NPT FITTINGS

1.45

POWER

2.90

3.33

ZERO

SPAN

1.89

ASSEMBLED WITH 101A213-01

CONDUIT KIT

ASSEMBLED WITH 101A213-01 CONDUIT KIT

4.85

2.06

R R .88 .88

.78 .78

.37

1.32

HOUSING TABS (2)

.37

1.32