Ashcroft IXLdp Arkusz instrukcji

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MODEL IXLdp TRANSDUCER

INSTRUCTION SHEET

THIS PAGE

INTENTIONALLY

BLANK

MODEL IXLdp TRANSDUCER

INSTRUCTION SHEET

WARNING! READ

zero pressure offsets that are encountered

can be adjusted using the zero adjust poten-

BEFORE INSTALLATION

tiometer. (See the Calibration section for more

details on the zeroing procedure.)

1. GENERAL:

PIPING

A failure resulting in injury or damage

The "high" and "low" pressure connection ports

may be caused by excessive overpres-

are plugged to avoid debris entering the unit.

sure, excessive vibration or pressure pul-

The plugs should be left in place until the tub-

sation, excessive instrument temperature,

ing and fittings are connected. The two

corrosion of the pressure containing parts,

pressure connections should be sealed to the

or other misuse. Consult Ashcroft Inc.,

transducer housing using teflon tape. The use

Stratford, Connecticut, USA before installing

of a dope-type sealant should not be used

if there are any questions or concerns.

since it may cause measurement errors

because of outgassing.

2. OVERPRESSURE:

Pressure spikes in excess of the rated over-

WIRING

pressure capability of the transducer may

Voltage Output:

cause irreversible electrical and/or

The IXLdp requires 12-36 VDC excitation for

mechanical damage to the pressure mea-

operation and will typically draw less than

suring and containing elements.

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

seconds.

3. STATIC ELECTRICAL CHARGES:

Any electrical device may be susceptible to

Current Output without FM Approval:

damage when exposed to static electrical

The voltage required for a 4-20mA output is

charges. To avoid damage to the transducer

dependent upon the loop resistance of the cir-

observe the following:

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

• Ground the body of the transducer BEFORE

portional to the load (loop resistance) being

making any electrical connections.

driven. Figure 2 shows the minimum supply

voltage (V

• When disconnecting, remove the ground

min

tance. The warm-up time is typically less than

LAST!

15 seconds.

Note: The shield and drain wire in the cable

Current Output with FM Approval:

(if supplied) is not connected to the trans-

IXKdps with the option FM approval must be

ducer body, and is not a suitable ground.

wired using the schematic diagram, 71B241,

DESCRIPTION

found on page 3 of the Installation and

The Industrial Low Pressure Differential

Maintenance instructions.

Transducer consists of a silicon diaphragm

The field wiring terminals can be accessed by

supported between two layers of metallized

unscrewing the four cover screws and remov-

glass. The Si-Glas technology combines the

ing the terminal block access cover (see Fig.

inherent high sensitivity of a variable capaci-

1). Once the cover is removed, make sure no

tance trans ducer using a micro-machined, sin-

contaminants, (e.g. water, oil, chemicals,

gle crystal diaphragm which provides excellent

grease, dirt, etc.), enter the inside of the

stability and repeatability.

enclosure. Feed the cable from the conduit

The transducer should be used with clean, dry

through one of the conduit attachment holes

air or other dry non-corrosive gases. Both

into the terminal area. Connect the conduit to

unidirectional (e.g. 0/1.0 in. W.C.) and bidirec-

the conduit connection threaded hole on the

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

side of the transducer. Attach the cable wires

are offered as well as a wide selection of out-

to the appropriate terminals. The unused con-

put signals.

nection hole should be closed with a suitable

The storage temperature limits of the trans-

conduit plug.

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

The transducer should be wired with a multi-

between –20 and 185°F and is temperature

conductor shielded cable. Figures 3 and 4

compensated between 0 and 160°F.

show how the current and voltage output

For units with FM approval Please see

transducers should be wired. The transducer

schematic diagram 71B241.

housing should be earth grounded at the

ground screw using one of the cable's conduc-

MOUNTING

tors as shown in Figures 3 and 4.

The unit should be mounted with #8 or #10

screws using the three mounting feet provided

When the cover is reinstalled, make sure the

(see Fig. 1). Easy access to the covers may

gasket is seated correctly and all four screws

be a consideration when mounting. The trans-

are properly engaged and tightened.

ducer can be mounted in any orientation with

virtually no effect on calibration. Any minor

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.

⁄

˝ NPT

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

) required for a given loop resis-

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

⁄

and 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.

⁄

. For example, a