BEKA BA304NC Manual de usuario

Issue: 7

4th March 2014

BA304NC

Type nA

Loop-powered

3½ digit field

mounting indicator

issue 7

1. Description

2. Operation

3. Type ‘nA’ Certification

3.1 ATEX Certificate

3.2 Zones, gas groups & T rating

3.3 Input parameters

3.4 Certification label information

4. System Design for Zone 2

4.1 Transmitter loops

4.2 Remote indication

5. Installation

5.1 Location

5.2 Installation procedure

5.3 EMC

6. Calibration

6.1 Zero adjustment

6.2 Span adjustment

6.3 Decimal point

6.4 Reverse action

6.5 Calibration example

6.6 Over and under-range

7. Maintenance

7.1 Fault finding during commissioning

7.2 Fault finding after commissioning

7.3 Servicing

7.4 Routine maintenance

7.5 Guarantee

7.6 Customer comments

8. Accessories

8.1 Engraved scale and tag plates

8.2 Root extractor

8.2.1 Calibration example

8.3 Display backlight

8.4 Pipe mounting kits

8.5 Panel mounting kit

The BA304NC is CE marked to show compliance with the

European Explosive Atmospheres Directive 94/9/EC

and the European EMC Directive 2004/108/EC

CONTENTS

1. DESCRIPTION

The BA304NC is an Ex nA (non sparking) loop

powered digital indicator which displays the current

flowing in a 4/20mA loop in engineering units. The

instrument introduces less than a 1.1V drop which

allows it to be installed into almost any 4/20mA

current loop. No additional power supply or battery

is required.

The main application of the BA304NC is to display

a measured variable or control signal in a Zone 2

hazardous process area. The zero and span of

the display are independently adjustable so that

the indicator may be calibrated to display any

variable represented by the 4/20mA current, e.g.

temperature, flow, pressure or level.

The BA304NC has been issued with a Type

Examination Certificate and complies with the

European ATEX Directive for Group II Category

3G equipment.

The indicator is available in a glass reinforced

polyester (GRP), or an epoxy painted aluminium

enclosure. Both provide IP66 protection.

2. OPERATION

Fig 1 shows a simplified block diagram of a

BA304NC. The 4/20mA input current flows

through resistor R1 and forward biased diode D1.

The voltage developed across D1, which is

relatively constant, is multiplied by a switch mode

power supply and used to power the analogue to

digital converter and liquid crystal display. The

voltage developed across R1, which is proportional

to the 4/20mA input current, provides the input

signal for the analogue to digital converter.

Fig 1 Simplified block diagram of BA304NC

3. TYPE ‘nA’ CERTIFICATION

3.1 ATEX certificate

The BA304NC complies with the European ATEX

Directive 94/9/EC for Group II, Category 3G

equipment. It has been assessed using the

‘Internal Control of Production’ procedure specified

in Annex 8 of the Directive. A technical dossier

has been prepared and a Type Examination

Certificate BEKA03ATEX0015 has been issued.

The instrument carries the community mark and

subject to local codes of practice may be installed

in any of the European Economic Area (EEA)

member countries. ATEX certificates are also

acceptable for installations in Switzerland.

This instruction manual describes installations

which conform with EN 60079:Part 14 Electrical

Installation in Hazardous Areas. When designing

systems for installation outside the UK, the local

Code of Practice should be consulted.

3.2 Zones, Gas Groups and T rating

The BA304NC has been certified as Group II,

Category 3G Ex nA nL ia IIC T5 Gc Tamb -40 to

60oC.

Ex nA is a non-sparking technique complying with

the requirements of harmonised standard

EN 60079-15:2010.

Ex nL is an energy-limiting technique complying

with EN 60079-15:2005 which will be de-

harmonised in May 2013. After this date Ex nL

approval will be for legacy purposes only i.e.

replacement & limited extensions.

Ex i code only applies to the potentiometers and

links.

These approval confirm that the BA304NC is safe

in normal operation and may be:

Installed in a Zone 2 hazardous area

At ambient temperatures between

-40 to 60ºC (operating temp –20 to +60ºC).

Used in gase groups:

Group A propane

Group B ethylene

Group C hydrogen

Having a temperature classification of:

T1 450ºC

T2 300ºC

T3 200ºC

T4 135ºC

T5 100ºC

Although certified safe in normal operation at

ambient temperatures between –40 and +60ºC,

the guaranteed operating temperature range of

the BA304NC is –20 to +60ºC.

This allows the BA304NC indicator to be installed

in a Zone 2 low risk hazardous area and to be

used with most common industrial gases except

carbon disulphide and ethyl nitride.

3.3 Input parameters

Input terminals 1 and 3 may be safely connected in

series with any 4/20mA loop providing that in

normal operation the input current to the indicator

does not exceed 100mA and the supply voltage

does not exceed 30V.

3.4 Certification Label Information

The certification information label is fitted on the

top outer surface of the enclosure. It shows the

ATEX certification information plus BEKA

associates name and location.

The instrument serial number and date of

manufacture are shown on a separate label within

the instrument enclosure.

4. SYSTEM DESIGN FOR ZONE 2

The BA304NC may be connected in series with

almost any Zone 2 4/20mA current loop and

calibrated to display the measured variable or

control signal in engineering units. There are four

design requirements:

1. The current flowing in the 4/20mA loop, must

not exceed 100mA in normal operation.

2. Wiring must comply with Clause 9 of

EN 60079-14 Electrical installation in

hazardous areas.

3. The instrument enclosure must be fitted with

Ex n or Ex e certified glands, conduit fittings

or blanking plugs.

4. The loop must be able to tolerate the

additional 1.2V required to operate the

indicator.

Fig 2 illustrate a typical application in which an

indicator is connected in series with a 2-wire Ex n

transmitter.

Fig 2 Typical Zone 2 transmitter loop

To strictly comply with the requirements of

EN 60079:14 Electrical installations design,

selection and erection, each of the wires entering

the hazardous area should be individually fused

and contain a means of isolation. However, in

practice instrumentation energised by a current

limited power supply or instrument that can be

switched off is often considered adequate.

4.2 Remote indication

The BA304NC may be driven directly from a safe

area instrument with a 4/20mA output to provide a

remote display within a Zone 2 hazardous area.

There are four design requirements:

1. The current flowing in the 4/20mA loop, must

not exceed 100mA in normal operation.

2. Wiring must comply with Clause 9 of

EN60079-14 Electrical installation in

hazardous areas.

3. The instrument enclosure must be fitted with

Ex n or Ex e certified glands, conduit fittings

or blanking plugs.

4. The safe area 4/20mA output from the safe

area instrument must be able to supply the

1.2V required to operate the indicator.

Fig 3 shows a typical application.

Fig 3 Remote indication in Zone 2 hazardous area

To strictly comply with the requirements of

EN 60079:14 Electrical Installation in Hazardous

Areas, each of the wires entering the hazardous

area should be individually fused and contain a

means of isolation. However, in practice

instrumentation energised by a current limited

power supply or instrument that can be switched

off is often considered adequate.

CAUTION !

The enclosure cover should only be

removed when the measuring loop is not

energised, or when there is no risk of a

flammable atmosphere being present and

dust or water can not enter the

enclosure. Before replacing the

enclosure cover ensure that the sealing

gasket is undamaged and that it is free

from dirt and foreign bodies.

Comprehensive design and installation information

for Ex nA [extra low voltage] instrumentation is

contained in the BEKA Application Guide AG310

which may be downloaded from the BEKA website

www.beka.co.uk.

5. INSTALLATION

5.1 Location

The BA304NC indicator can be supplied in either a

glass reinforced polyester (GRP), or an epoxy

painted aluminium enclosure. Both provide IP66

protection and have a polycarbonate window and

stainless steel fittings. The GRP enclosure is

suitable for most industrial installations including

off-shore and waste water treatment applications.

For installations where solvents may be present,

the aluminium enclosure provides maximum

protection, but it is not recommended for offshore

applications.

Both enclosures are surface mounting, but may be

pipe or panel mounted using the accessory kits

described in section 8 of this manual.

To simplify installation, the enclosure can be

installed and the field wiring terminated prior to the

indicator assembly being fitted. The enclosure

contains diodes to maintain continuity of the

4/20mA loop when the indicator assembly is not

present. Terminals 2 and 4 are internally joined

and may be used for linking the return 4/20mA wire

- see Fig 2. Similarly, terminals 5 and 6 are

internally joined and may be used for linking the

cable screens. Terminal 7 is internally connected

to an insulated radio frequency screen in the GRP

enclosure, and to the case in the aluminium

enclosure.

5.2 Installation Procedure

Fig 4 illustrates the instrument installation

procedure.

a. Remove the enclosure cover by unscrewing

the four captive 'A' screws.

b. Remove the indicator assembly from the

enclosure by unscrewing the three captive 'B'

screws.

c. Mount the enclosure on a flat surface and

secure with screws or bolts through the four

corner 'C' holes. Alternatively use one of the

pipe or panel mounting kits described in

sections 8.4 and 8.5

d. Remove the temporary hole plug and install

an Ex e or Ex n cable gland or conduit fitting.

If two entries are required, the stopping plug

may be replaced with an Ex e or Ex n cable

gland or conduit fitting.

e. Connect the field wiring to the terminals as

shown in Fig 5.

f. Replace the indicator assembly and evenly

tighten the three 'B' screws.

g. Replace the enclosure cover and evenly

tighten the four 'A' screws.

Fig 4 BA304NC installation procedure

Comprehensive installation information for

Ex nA [extra low voltage] instrumentation is

contained in the BEKA Application Guide AG310

which may be downloaded from the BEKA website

www.beka.co.uk.

5.3 EMC

The BA304NC complies with the requirements of

the European EMC Directive 2004/108/EC. For

specified immunity all 4/20mA wiring should be in

screened twisted pairs, with the screen earthed

within the safe area. Terminal 7 should be

connected to a local earth or to a cable screen

which is earthed in the safe area.

Fig 5 Dimensions and terminal connections

6. CALIBRATION

The BA304NC will be supplied calibrated as

requested at time of ordering. If calibration is not

requested, the indicator will be set to display 00.0

with 4.000mA input, and 100.0 with 20.000mA

input.

The BA304NC is conditioned and calibrated by

plug-in links and two multi-turn potentiometers.

For maximum accuracy, the instrument should be

calibrated using an external traceable current

source with a resolution of at least 4µA.

Fig 6 Location of calibration links

and potentiometers

6.1 Zero adjustment

Zero is defined as the number displayed by the

indicator with a 4.000mA input current and may be

adjusted between -1000 and 1000. The zero

potentiometer has two ranges, 0 to 500 and 500 to

1000. Zero polarity is defined by the position of

the suppression / elevation links which are shown

in Fig 6.

Suppression / elevation links

Position Display with 4mA input

adjustable between

Elevation 0 and 1000

Suppression 0 and -1000

Zero link

Position Display with 4mA input

adjustable between

0 to 500 0 and 500

500 to 1000 500 to 1000

6.2 Span adjustment

Span is defined as the difference between the

number displayed with 4.000mA input and the

number displayed with 20.000mA input. It is

adjustable between 0 and 1999 in four ranges. Fig

6 shows the position of the span links and the span

potentiometer.

Difference in display

Position with 4 & 20mA input

of span links adjustable between

000 to 500 000 and 500

or 500 to 1000 500 and 1000

or 1000 to 1500 1000 and 1500

or 1500 to 1999 1500 and 1999

6.3 Decimal point

A dummy decimal point may be displayed between

any of the four digits. The position or absence of

this dummy decimal point is determined by the

position of the decimal point link shown in Fig 6.

When calculating the required span and zero

settings the decimal point should be ignored.

6.4 Reverse action

Normally the BA304NC display increases as the

input current increases, but this can be reversed.

Please contact BEKA associates for details.

6.5 Calibration example

The BA304NC is required to display:

25.0 with 4.000mA input

115.0 with 20.000mA input

i.e. A zero of positive 250 (Ignoring decimal point)

A span of 900 (Ignoring decimal point)

A decimal point in position 00.0

The following adjustments are required:

Step 1 The BA304NC is required to display a

positive zero therefore the suppression

/ elevation links should be put in the

elevation position.

Step 2 The required zero is 250, therefore the

zero link should be put in the 0 to 500

position.

Step 3 The required span is 900, therefore the

span links should be placed in the 500

to 1000 position.

Step 4 The decimal point is required in front of

the least significant digit, therefore the

decimal point link should be placed in

the 00.0 position.

Step 5 With 4.000mA input adjust the zero

potentiometer until the indicator

displays 25.0

Step 6 With 20.000mA input adjust the span

potentiometer until the indicator

displays 115.0

Step 7 Repeat steps 5 and 6 until both

calibration points are correct. The span

and zero controls are almost

independent so it should only be

necessary to repeat each adjustment

twice.

6.6 Over and under-range

If the indicator display range is exceeded, the three

least significant digits will be blanked. Under-

range is indicated by -1 and over-range by 1. If

the display range is not exceeded, the BA304NC

will produce accurate readings outside the 4/20mA

current range. Although not guaranteed, most

BA304NC indicators will operate between 3 and

25mA.

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