Ashcroft Ixldp User manual

All sales subject to standard terms and conditions of sale. I&M011-10062 (250-2985) Rev. I 06/15

MODEL IXLdp TRANSDUCER

INSTRUCTION SHEET

MODEL IXLdp TRANSDUCER

INSTRUCTION SHEET

WARNING! READ

BEFORE INSTALLATION

1. GENERAL:

A failure resulting in injury or damage

may be caused by excessive overpres-

sure, excessive vibration or pressure pul-

sation, 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. O ERPRESSURE:

Pressure spikes in excess of the rated over-

pressure capability of the transducer may

cause irreversible electrical and/or

mechanical damage to the pressure mea-

suring 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:

• round 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 trans-

ducer 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- las technology combines the

inherent high sensitivity of a variable capaci-

tance trans ducer using a micro-machined, sin-

gle 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 bidirec-

tional (e.g. +/– 5.0 in. W.C.) pressure ranges

are offered as well as a wide selection of out-

put signals.

The storage temperature limits of the trans-

ducer are –40 to 210°F. The unit can operate

between –20 and 185°F and is temperature

compensated between 0 and 160°F.

For units with FM approval Please see

schematic diagram 71B241.

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 trans-

ducer 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 poten-

tiometer. (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 tub-

ing 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

oltage Output:

The IXLdp requires 12-36 VDC excitation for

operation and will typically draw less than

5mA. The warm-up is typically less than 15

seconds.

Current Output without FM Approval:

The voltage required for a 4-20mA output is

dependent upon the loop resistance of the cir-

cuit (see Fig. 2). The voltage required is pro-

portional to the load (loop resistance) being

driven. Figure 2 shows the minimum supply

voltage (Vmin) required for a given loop resis-

tance. The warm-up time is typically less than

15 seconds.

Current Output with FM Approval:

IXKdps with the option FM approval must be

wired using the schematic diagram, 71B241,

found on page 3 of the Installation and

Maintenance instructions.

The field wiring terminals can be accessed by

unscrewing the four cover screws and remov-

ing 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 con-

nection hole should be closed with a suitable

conduit plug.

The transducer should be wired with a multi-

conductor 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 conduc-

tors 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.

All sales subject to standard terms and conditions of sale. I&M011-10062 (250-2985) Rev. I 06/15

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

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 adjust-

ment screw. Before you adjust, make sure a

short tube is connected from the “low” port to

the “high” port of the transducer. This connec-

tion 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 prob-

lems 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.

PH SICAL

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 re-

ranged by a 1⁄2, 1⁄3, 1⁄4and 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.

THIS PAGE

INTENTIONALLY

BLANK

I&M 011-10062-1-01 250-2985-I.qxp_special 6/24/15 10:31 AM Page 4

71B241 H

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250 EAST MAIN STREET,

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CAD GENERATED DRAWING,

DO NOT MANUALLY UPDATE

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for any other purpose or discosed to others, and it will

DIMENSIONAL TOLERANCES

FRACTIONS DECIMALS ANGLES

CHAMFER:

PRESSURE TRANSMITTERS

DATE

SERIES DIFFERENTIAL

STRATFORD, CT 06614

K. Kavgaci

01-06-2014

UNLESS OTHERWISE SPECIFIED

DRAWN BY

1 deg

DIMENSIONS ARE IN INCHES

TOLERANCES ARE:

be returned on demand.

ANGLE:

FOR TYPE IXLdp, RoHS, XFM

" #

SHEET 1 OF 1

$%

SCHEMATIC DIAGRAM

5 deg

DO NOT SCALE DRAWING

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(

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3 PLACE DECIMAL: .000 .007

2 PLACE DECIMAL: .00 .015

1 PLACE DECIMAL: .0 .030

This drawing includes confidential information which is

the property of ASHCROFT INC.

This copy is loaned for a specific purpose, with the

understanding that it will not be reproduced or used

IMPORTANT:

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Item Qty Part No Description Material Finish Dwg. No. Used On

H 6354 REDRAW IN S'WORKS. DELETED SHEET 2,3&4.

ADDED THE FM CONT. DOC. TABLE KK 3/10/2014

G 0002246

REDRAWN IN SOLIDWORKS. REVISED FORMAT &

VIEW TO DELETE REFERENCE TO DRESSER AND

REPLACE WITH ASHCROFT INC.

ALH 02/13/2006

Rev ECO DESCRIPTION BY DATE

AGENCY: FILE/CERT#

CSA N/A

FM 2V5A0AX

CONTROLLED DOCUMENT

No changes permitted without prior approval by:

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

➤

1/2 NPSM THREAD TYP BOTH

SIDES FOR CONDUIT PIPING

ACCESS COVER

(ZERO AND SPAN POTS)

➤

2.5

➤

0.8 1.34

3.0

0.7

HIGH LOW

1/4 NPT

PRESSURE

FITTINGS

➤

Figure 1.

General Dimensions (INCHES)

OPERATING

REGION

LOOP SUPPLY VOLTAGE (VDC)

010 12 20 30 36 40

1250

1045

1000

750

500

250

LOOP RESISTANCE (OHMS)

LOAD LIMITATION 4-20mA OUTPUT ONLY

Figure 2. Loop Supply Voltage vs. Loop Resistance

Figure 3.

Current (4-20mA) Output Wiring

min = 12 + (.022A x RL)

RL= RS+ RW

RL= Loop Resistance (ohms)

RS= Sense Resistance (ohms)

RW= Wire Resistance (ohms)

*INCLUDES A 10% SAFETY FACTOR

Figure 4.

Voltage Output Wiring

MODEL IXLdp TRANSDUCER

INSTRUCTION SHEET

Hazardous Area Specific Guidelines:

1. Do not open unit when energized.

2 .Do not disconnect equipment unless area is

known to be non-hazardous.

FM Installation Notes:

SEE DRAWIN 71B241-1

Intrinsically-Safe Entity Barrier Parameters:

Definition of Entity Concept: The entity concept

allows interconnection of intrinsically safe

apparatus to associated apparatus not specifi-

cally examined in such combination. The crite-

ria for interconnection is that the voltage and

current which intrinsically-safe apparatus can

receive and remain intrinsically-safe, consider-

ing faults, must be equal to or greater than the

voltage and current levels which can be deliv-

ered by the associated apparatus, considering

faults and applicable factors. In addition, the

maximum unprotected capacitance and induc-

tance of the IS apparatus, including the inter-

connecting wiring, must be equal or less than

the capacitance and inductance which can be

safely connected to the associated apparatus.

The “entity parameters” were broadened to

allow IXLdp users the freedom to apply the

IXLdp into a wider array of applications.

Additionally, the inclusion of a “nonincendive”

rating gives our customers the ability to

choose an intrinsically safe barrier from any

barrier manufacturer meeting the below ratings.

All sales subject to standard terms and conditions of sale. I&M011-10062 (250-2985) Rev. I 06/15 © 2015 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