Ashcroft IXLdp - Low Differential Pressure Transmitter Manuel d'utilisateur télécharger pdf

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. OVERPRESSURE:

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:

• Ground 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-Glas 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.

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

⁄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

Voltage Output:

The IXLdp requires 12-36 VDC excitation for

operation and will draw less than 5 mA. Warm-

up is typically less than 15 seconds.

Current Output:

The voltage required for a 4-20mA output is

dependent upon the loop resistance of the

circuit (see Fig. 2). The voltage required is

proportional to the load (loop resistance)

being driven. Figure 2 shows the minimum

supply voltage (V

min

) required for a given

loop resistance. Warm-up is typically less

than 15 seconds.

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.

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

All sales subject to standard terms and conditions of sale. I&M011-10062 (250-2985) Rev. A 5/11

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.

PHYSICAL

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

⁄2,

⁄3,

⁄4 and a

⁄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.

1 2

Résumé du contenu

Page 1 - BEFORE INSTALLATION

MODEL IXLdp TRANSDUCERINSTRUCTION SHEETWARNING! READ BEFORE INSTALLATION1. GENERAL:A failure resulting in injury or damagemay be caused by excessive

Page 2 - INSTRUCTION SHEET

MOUNTINGFOOT➤➤➤➤➤➤➤ø 0.21.44.31➤➤➤➤➤0.2 TYP2) PLACESMOUNTING FOOT2.68ACCESS COVER (TERMINAL BLOCK)➤➤MOUNTING FOOTSPAN POTZERO POTLOCATION➤➤➤➤➤➤2.74.6➤

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