Ashcroft CXLdp Fiche d'installation

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MODEL CXLdp HIGH ACCURACY

DIFFERENTIAL PRESSURE TRANSDUCER

INSTALLATION & MAINTENANCE SHEET

WARNING! READ

BEFORE INSTALLATION

1. GENERAL:

A failure resulting in injury or damage may be

caused by excessive overpressure, excessive

vibration or pressure pulsation, excessive

instrument temperature, corrosion of the pres-

sure containing parts, or other misuse. Con-

sult Ashcroft Inc., Stratford, Connecticut, USA

before installing if there are any questions or

concerns.

2. OVERPRESSURE:

Pressure spikes in excess of the rated overpres-

sure capability of the transducer may cause irre-

versible electrical and/or mechanical damage to

the pressure measuring and containing elements.

3. STATIC ELECTRICAL CHARGES:

Any electrical device may be susceptible to dam-

age when exposed to static electrical charges.

To avoid damage to the transducer the

operator/installer should follow proper ESD

(electrostatic discharge) protection procedures

before handling the pressure transducer.

DESCRIPTION

The Ashcroft

Model CXLdp High Accuracy is a

low differential pressure transmitter to be used on

clean, dry, non-corrosive gases. It is available in

two accuracy classes and its performance is trace-

able to the U. S. National Institute of Standards and

Technology (NIST). The 3 located in the third posi-

tion distinguishes a 0.25% transmitter. Both unidi-

rectional (e.g. 0 to +1.0 IW) or bi-directional (e.g.

±2.0 IW) models are available. A green LED located

on the front of the transmitter indicates power and

operational status. The LED light intensity increases

as pressure increases.

SPECIFICATIONS

Accuracy:

• ±0.25% span

- (±0.04mA for 4-20mA output units)

- (±0.025V for 0-10Vdc output units

Output Signal: Specified at time of order.

• 4-20ma (For symmetric bidirectional ranges

0IW= 12mA

• 0-10Vdc; 0-5Vdc User selectable option (For

symmetric bidirectional ranges 0IW= 5 or

2.5Vdc respectively).

Supply Voltage:

• 4-20mA: 12-36 Vdc (no regulation required)

(see Figure 1)

• 0-10Vdc (0-5Vdc User selectable option):

14-36 Vdc or 24 Vac (+/- 20%)

• Supply Current: 6mA (4.5mA for 5Vdc

output option)

Reverse Wiring Protected

Electrical Connection: unpluggable terminal block

accepts 12-26 AWG

Operating Temperature: 0-160°F

Load Limitations 4-20mA Output

Figure 1

Loop Resistance (Ω)

TING

V min = 12V+ [.022A*(R L )]

*includes a 10% safety factor

R L = R S + R W

R L = Loop Resistance (ohms)

R S = Sense Resistance (ohms)

R W = Wire Resistance (ohms)

Loop Supply Voltage (Vdc)

* F.S. pressure is equivalnt to the span of the transmitter (16mA).

Enclosure:

NEMA 1 Fire-retardant ABS Meets UL 94-5VA

Weight: Approx. 2.5 oz.

Pressure Connection Options:

⁄

˝ Brass Barbs or

⁄

NPT Female Brass

Figure 2

Optional:

⁄

˝ conduit

or plenum mounting

bracket and cover

available as sepa-

rately ordered kit –

part number

101A213-01.

(see Figure 2)

INSTALLATION

Mounting:

The transmitter

Figure 3

can be mounted

Use

on a 35 mm DIN

#10

rail or with #8 or

screw

#10 screws using

the 4 mounting

holes provided.

Torque limits on

the mounting

holes provided is

Zero Pot

6 inch-pounds.

(see Figure 3)

Electrical Wiring:

1. The use of sheilded cable is recommended for

optimum performance. Connect the shield to the

guard terminal on the reading instrument (meter,

etc.) if available or to ground.

2. Remove the terminal block on the front of the

transmitter.

3. Available electrical versions are:

a.) CURRENT 4-20mA; black terminal block.

b.) VOLTAGE 0-5Vdc/0-10Vdc; green terminal

block.

Follow the terminal block label markings on

the CXLdp High Accuracy to identify the

terminals;

• 4-20mA Ouput: The left, negative (–), and

right, positive (+) terminals are used, ignore

the center terminal which is not used. Con-

nect the power supply positive lead to the

CXLdp High Accuracy positive terminal, con-

nect the negative power supply lead to the

negative terminal of the BCS 4-20mA input.

ZERO

Zero adjust

potentiometer

Last, connect the (–) negative terminal on the

CXLdp High Accuracy to the (+) positive BCS

input.

ZERO

Zero adjust

potentiometer

–

Common (V

)

POWER SUPPLY

• 0-10Vdc; 0-5Vdc Output: Follow label mark-

ings for terminal assignments; COM is for

Common (supply and output negative), V

is for supply positive and V

signal. The CXLdp High Accuracy Voltage Out-

Use #8

screw

put unit is supplied as standard with 0-10 V

output, to convert to 0-5 V output see

following instructions.

- 0-10 Vdc Output: Product is supplied as

standard with 0-10 V output, see instruction

below to access the Voltage Output jumper.

Green LED

- 0-5 Vdc Output: See below for proper

jumper selection. To convert the unit from a

0-10 V output to a 0-5 V output unit note the

following. Access the jumper by simultane-

ously pushing both housing tabs away from

the housing, see drawings under "General

Dimensions" for

details. Change

jumper (orange)

into position as

shown below,

carefully reattach

housing cover.

When finished

mark check box

on front label in-

dicating that the

unit now provides

a 0-5Vdc output.

4. Firmly reinstall the terminal block plug to its

mating connector.

SPAN

–

Span adjust

potentiometer

POWER

–

SUPPLY

BCS

SPAN

Span adjust

potentiometer

–

Out

Vin (V+, Supply)

is for output

OUT

Figure 4

Jumper

0-10 Vdc

(orange)

0-5 Vdc

Label Part No. 238A713-01