BEKA BA327NE, BA307NE User Manual

BA307NE & BA327NE

Ex nA & Ex tc
loop-powered

panel mounting indicators

Issue 3

st

1

Novemeber 2017

Issue: 3

2

CONTENTS

1. Description

2. Operation

2.1 Controls

3. Certification

3.1 ATEX Ex nA certification

3.2 Zones, gas groups & T rating

3.3 4/20mA input

3.4 Certification label information

4. System Design for Zone 2 Gas

Hazardous Areas

4.1 Transmitter loops

4.2 Remote indication

5. Installation

5.1 Location

5.2 Installation procedure

5.3 Indicator earthing

5.4 EMC

5.5 Scale card

6. Configuration and Calibration

6.1 Summary of configuration
functions.

6.2 Indicator function

6.3 Resolution

6.4 Position of decimal point

6.5 Calibration using an external
current source.

6.6 Calibration using internal reference.

6.7 Bargraph format and calibration

6.8 Function of the P push button

6.9 Tare function

6.10 Security code

6.11 Reset to factory defaults

6.12 Under and over-range

8. Maintenance

8.1 Fault finding during commissioning

8.2 Fault finding after commissioning

8.3 Servicing

8.4 Routine maintenance

8.5 Guarantee

8.6 Customer comments

9. Accessories

9.1 Scale card

9.2 Tag information

9.3 Stainless steel support plate

9.4 Alarms

9.4.1 Solid state output

9.4.2 Type nA certification

9.4.3 Configuration and adjustment.

9.4.4 Alarm enable

9.4.5 Setpoint adjustment

9.4.6 Alarm function

9.4.7 Alarm output status

9.4.8 Hysteresis

9.4.9 Alarm delay

9.4.10 Alarm silence time

9.4.11 Flash display when alarm occurs.

9.4.12 Access setpoint in display mode.

9.4.13 Adjusting alarm setpoint from
the display mode.

9.4.14 Displaying setpoints on
BA327NE bargraph.

9.5 Display backlight

9.5.1 Loop powering the backlight

9.5.2 Separately powering the backlight.

Appendix 1 Use in an Ex e increased safety or

Ex p pressurised enclosure located in
Zone 2.

7. Lineariser

Appendix 2 ATEX dust certification

7.1 Lineariser calibration using an external
current source.

Appendix 3 IECEx gas and dust certification

7.2 Lineariser calibration using internal
reference.

Appendix 4 ETL and cETL certification

7.3 Lineariser error message

7.4 Under and over-range

7.5 Lineariser default configuration

The BA307NE & BA327NE are CE marked to show compliance with the European Explosive Atmospheres

Directive 2014/34/EU and the European EMC Directive 2014/30/EU

3

1. DESCRIPTION

These panel mounting, Ex nA certified non­sparking digital indicators display the current
flowing in a 4/20mA loop in engineering units.
They are loop powered but only introduce a 1.2V
drop, which allows them to be installed into almost
any 4/20mA current loop. No additional power
supply or battery is required.

The two models are electrically similar, but have
different displays.

Model Display

BA307NE 4 digits 15mm high

BA327NE 5 digits 11mm high

and 31 segment bargraph.

This instruction manual supplements the
instruction sheet supplied with each instrument.

The main application of both models is to display a
measured variable or control signal in a Zone 2
gas hazardous area or a Zone 22 dust hazardous
process area. The zero and span of the display
are independently adjustable so that the indicator
can be calibrated to display any variable
represented by the 4/20mA current, e.g.
temperature, flow, pressure or level.

2. OPERATION

Fig 1 shows a simplified block diagram of both
models. 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 instrument. The
voltage developed across R1, which is proportional
to the 4/20mA input current, provides the input
signal for the analogue to digital converter.

Each time a 4/20mA current is applied to the
instrument initialisation is performed during which
all segments of the display are activated, after five
seconds the instrument displays the input current
using the calibration information stored in the
instrument memory.

If the loop current is less than 1.2mA the indicator
will display the error message ‘LPLo’, below this
input current the instrument will not function
correctly.

If required optional factory fitted dual alarms and a
green display backlight which can be loop or
separately powered, should be specified when the
instrument is ordered.

Both models have been issued with a common
Type Examination Certificate ITS14ATEX48028X
by Notified Body Intertek Testing and Certification
Ltd. This confirms compliance with the type of
protection requirements for non-sparking Ex nA
apparatus, and for dust ignition protection by
enclosure Ex tc. This certificate has been used to
confirm compliance with the European ATEX
Directive 94/9/EC.

The certificate number has an 'X' suffix indicating

that the two indicators are subject to special
condition for safe use. For installations in Zone 2
the panel enclosure into which the indicators are
mounted should comply with Ex n requirements
which are defined in BS EN 60079-15. The
indicators may also be installed in an Ex e or Ex p
panel enclosure located in Zone 2 as described in
Appendix 2.

Installation requirements for use in Zone 22 dust
hazardous areas are described in Appendix 2..

Fig 1 Indicator block diagram

The two indicators have also been issued with a
common IECEx Ex nA and Ex tc Certificate of
Conformity which is described in Appendix 3.

For applications in the USA and Canada, both
models have ETL and cETL certification which is
described in Appendix 4.

4

2.1 Controls

The indicators are controlled and calibrated via the
four front panel push button switches. In the
display mode i.e. when the indicator is displaying a
process variable, these push buttons have the
following functions:

P While this button is pushed the

indicator will display the input current in
mA, or as a percentage of the
instrument span depending upon how
the indicator has been configured.
When the button is released the normal
display in engineering units will return.
The function of this push button is
modified when optional alarms are
fitted to the indicator.

▼ While this button is pushed the

indicator will display the numerical
value and analogue bargraph* the
indicator has been calibrated to display
with a 4mA

Φ

input. When released the
normal display in engineering units will
return.

3. CERTIFICATION

Both models have ATEX and IECEx gas and dust
certification. The main sections of this instruction
manual describes ATEX gas certification. ATEX
dust approval is described in Appendix 2 and
IECEx gas and dust certification in Appendix 3.

3.1 ATEX Ex nA certification

Notified Body Intertek Testing and Certification Ltd
have issued both instruments with a common Type
Examination Certificate number
ITS14ATEX48028X. This has been used to
confirm compliance with the European ATEX
Directive for Group II, Category 3GD equipment.
The instruments carry the Community Mark and,
subject to local codes of practice, may be installed
in any of the European Economic Area (EEA)
member countries and in the EEA EFTA states,
Iceland, Liechtenstein and Norway. ATEX
certificates are also acceptable in Switzerland and
Turkey. The European Commission's Blue Guide
lists the member states, overseas countries and
territories that have adopted harmonisation
legislation.

▲ While this button is pushed the

indicator will display the numerical
value and analogue bargraph* the
indicator has been calibrated to display
with a 20mA

Φ

input. When released the
normal display in engineering units will
return.

E No function in the display mode unless

the tare function is being used.

P + ▼ Indicator displays firmware number

followed by version.

P + ▲ Provides direct access to the alarm

setpoints when optional alarms are
fitted to the indicator and the ‘ACSP’

access setpoints in display mode

function has been enabled.

P + E Provides access to the configuration

menu via optional security code.

Notes: * BA327NE only

Φ

If the indicator has been calibrated
using the CAL function, calibration
points may not be 4 and 20mA.

This section of the instruction manual describes
ATEX installations in explosive gas atmospheres
conforming with BS EN 60079-14:2008 Electrical
installations design, selection and erection. 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 indicators have been certified as Group II
Category 3G Ex nA ic IIC T5 Gc apparatus and
may be used in an ambient temperature Ta
between – 40°C to +70°C. This is non-sparking
apparatus complying with BS EN 60079-15
Equipment protection by type of protection 'n' that
minimises the risk of arcs or sparks capable of
creating an ignition hazard occurring during
conditions of normal operation.

Special conditions for safe use are specified by the
Ex nA certificate indicated by the certificate
number's 'X' suffix. These state that the indicators
should be correctly mounted in a panel enclosure
complying with the requirements specified in
BS EN 60079-15:2010 for Equipment protection by
type of Protection 'n'. For Category 3 installations
in Zone 2 self or third party certified Ex n, Ex e or
Ex p panel enclosures may be used. Additional
requirement apply for non-metallic panel
enclosures.

BS EN 60079-17 Electrical installations inspection
and maintenance permits live maintenance in Zone
2 if a risk analysis demonstrates that this does not
introduce an unacceptable risk. The removal of
covers [opening of Ex n enclosure] is permitted if

5

this can be done without contaminating the interior
of the instrument with dust or moisture. Some end­users may prefer not to permit live maintenance to
minimise risk.

The indicator's front panel push button contacts
are non incendive and have been certified
intrinsically Ex ic as shown on the Type
Examination Certificate. This allows the indicators
to be adjusted and configured live when installed in
a panel enclosure located in Zones 2 or 22.

When connected to a suitable system and
correctly mounted in a panel enclosure complying
with the requirements for Type of protection 'n', the
panel enclosure containing the BA307NE or
BA327NE may be installed in:

Zone 2 explosive gas air mixture not

likely to occur, and if it does

will only exist for a short time.

Be used with gases in groups:

Group A propane
Group B ethylene
Group C hydrogen

3.4 Certification label information

The certification label is fitted in a recess on the
top of the instrument. It shows the ATEX
certification information, BEKA associates name
and location, year of manufacture and the
instrument serial number. IECEx certification
information is also be shown.

BA307NE certification label

In gases that may safely be used with
equipment having a temperature classification
of:

T1 450oC
T2 300
T3 200
T4 135
T5 100

At ambient temperatures between -40 and +70

o

C

o

C

o

C

o

C

o

C.

This allows use with all commonly used industrial
gases except carbon disulphide CS

.

2

3.3 4/20mA input

The input safety parameters for the 4/20mA input,
terminals 1 and 3 are:

Ii = 200mA

The indicators are current input instruments
incorporating an internal protection circuit that
defines the voltage developed between the input
terminals 1 and 3, therefore the ATEX certificate
does not specify a maximum safety input
voltage Ui.

6

4. SYSTEM DESIGN FOR USE IN ZONE 2 GAS
HAZARDOUS AREAS.

4.1 Transmitter loops

When correctly mounted in Zone 2 both indicators
may be connected in series with almost any
4/20mA current loop with apparatus in the safe
area, or with Ex n, Ex e, Ex p or Ex d protected
apparatus located in Zones 1 or 2. The indicators
are transparent to HART

®

signals.

Because the BA307NE and BA327NE are not
certified intrinsically safe they should not be
connected to an intrinsically safe system.

There are four design requirements:

1. The indicator must be installed in a panel
enclosure complying with the requirements
for Ex n protection as shown in section 5 of
this manual.

2. The certificate specifies that the indicator
should be connected to a limited energy
4/20mA circuit having a maximum output
current of 200mA. A low voltage supply,
usually 24V, that is safe in normal operation
and suitable for live connection i.e. CE
marked, is usually considered acceptable.

3. Wiring must comply with Clause 9 of
BS EN 60079-14.

To comply with the requirements of
BS EN 60079:14:2008 Electrical installations
design, selection and erection, each of the wires
entering the hazardous area should be individually
fused and contain a means of isolation. These two
requirements are frequently satisfied by using
switch fuse holders with easily removable fuses
which can be extracted to achieve isolation as
shown in Fig 20. This is a satisfactory method at
the low voltages and currents common in
instrumentation systems. Clear identification of,
and easy access to the means of isolation is
essential for their effective use. It is also necessary
to ensure that the maintenance procedure makes
sure that unauthorised re-closure of the switches
does not occur. It is not considered necessary to
have a means of isolation or electrical protection
for the screen.

For some applications Ex nA instrumentation
energised by a current limited power supply or
instrument that can be switched off, is often
considered adequate and to comply with the
requirements of the standard.

4.2 Remote indication

The BA307NE and the BA327NE may also be
driven directly from a safe area instrument with a
4/20mA output to provide a remote display within a
Zone 2 hazardous area.

4. The loop must be able to tolerate the
additional 1.2V required to operate the
indicator. This increases to 5.0V if the
indicator is fitted with an optional backlight
which is loop powered. See 9.5.1

Figs 2 illustrate a typical application in which a
BA307NE or BA327NE located in Zone 2 is
connected in series with a 2-wire Ex d transmitter
located in Zone 1. BEKA Application Guide
AG310, which can be downloaded from
www.beka.co.uk, contains examples of other Ex n
applications.

There are four design requirements:

1. The indicator must be installed in a panel
enclosure complying with the requirements
for Ex n protection as shown in section 5 of
this manual.

2. The certificates specify that the indicator
should be connected to a limited energy
4/20mA circuit having a maximum output
current of 200mA. An instrument located in
the safe area that is safe in normal operation
and has a 4/20mA output suitable for live
connection i.e. CE marked, is usually
considered acceptable.

3. Wiring must comply with Clause 9 of
BS EN 60079-14:2008.

4. The output from the safe area 4/20mA
instrument must be able to supply the 1.2V
required to operate the indicator. This
increases to 5.0V if the indicator includes an
optional backlight which is loop powered.
See 9.4.1

Fig 2 Typical Zone 2 transmitter loop

Fig 3 shows a typical application.

Fig 3 Remote indication in Zone 2 hazardous area

To comply with the requirements of
BS 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. These two
requirements are frequently satisfied by using
switch fuse holders with easily removable fuses
which can be extracted to achieve isolation as
shown in Fig 20. This is a satisfactory method at
the low voltages and currents common in
instrumentation systems. Clear identification of,
and easy access to the means of isolation is
essential for their effective use. It is also necessary
to ensure that the maintenance procedure makes
sure that unauthorised re-closure of the switches
does not occur. It is not considered necessary to
have a means of isolation or electrical protection
for the screen.

7

For some applications Ex nA instrumentation
energised by a current limited power supply or
instrument that can be switched off, is often
considered adequate and to comply with the
requirements of the standard.

8

5. INSTALLATION

5.1 Location

When installed in a panel enclosure complying with
the requirements for Ex n protection as shown in
section 3.2 of this manual, both indicators may be
located in a Zone 2 hazardous area providing that
the operating temperature is between –40°C and
+70°C and the installation complies with the
indicator's certification requirements. Certified
Ex e panel enclosures are frequently used as Ex n
panel enclosures.

The indicators may also be installed in an Ex e or
Ex p panel enclosure located in Zone 2 as
described in Appendix 1.

Both indicators have a stainless steel housings
with a 7J front of panel impact resistance
incorporating a 10mm thick toughened glass
window which can withstand a 4J impact. This,
together with a captive silicone gasket which seals
the joint between the instrument and the panel,
enclosure provides IP66 ingress protection. Both
indicators have IP20 rear protection.

5.2 Installation Procedure

a. Cut the aperture specified in Fig 4 in the

panel enclosure. Ensure that the edges of
aperture are de-burred.

b. Inspect the indicator's captive gasket and

ensure that it is not damaged before inserting
the indicator into the panel enclosure
aperture.

c. If the enclosure panel is less than 1.0mm

thick, or is non-metallic, an optional BEKA
stainless steel support plate should be slid
over the rear of the indicator before the panel
clamps are fitted to evenly distribute the
clamping force and prevent the enclosure
panel being distorted or creeping.

d. Slide a panel clamp into the two grooves at

each corner of the indicator housing with the
M3 stud protruding through the hole at the
rear of the clamp. Fit the stainless steel
spring washer over the stud and secure with
the stainless steel wing nut.

Although the front of the indicators have IP66
protection, they should be shielded from
continuous direct sunlight and severe weather
conditions.

Fig 4 show the overall dimensions of the indicators
together with the recommended panel enclosure
cut-out dimensions.

e. Evenly tighten the four clamps to secure the

instrument. The recommended minimum
tightening torque for each wing nut is 22cNm
(1.95 lbf in).

f. Connect the panel enclosure wiring to the

rear terminal blocks. To simplify installation,
the terminals are removable so that wiring
can be completed before the instrument is
installed. Wiring should be supported to
prevent damage resulting from vibration.

g. Finally, fit a silicone rubber push-on cap to

the end of each M3 threaded rod.

Fig 4 Dimensions

9

5.5 Scale card

The indicator’s units of measurement are shown
on a printed scale card in a window at the right
hand side of the display. The scale card is
mounted on a flexible strip that is inserted into a
slot at the rear of the instrument as shown in Fig 7.
Thus the scale card can easily be changed without
dismantling the indicator or removing it from the
Ex n enclosure in which it is mounted.

New indicators are supplied with a printed scale
card showing the requested units of measurement,
if this information is not supplied when the indicator
is ordered a blank card will be fitted.

A pack of self-adhesive scale cards printed with
common units of measurement is available as an
accessory from BEKA associates. Custom printed
scale cards can also be supplied.

To change a scale card, unclip the protruding end
of the flexible strip by gently pushing it upwards
and pulling it out of the enclosure. Peel the
existing scale card from the flexible strip and
replace it with a new printed card, which should be
aligned as shown below. Do not fit a new scale
card on top of an existing card.

Fig 5 Installation procedure

5.3 Indicator earthing

Both indicators have an M4 earth stud on the rear
panel which should be electrically connected to the
panel enclosure in which the indicator is mounted,
or to the plant equipotential conductor.

5.4 EMC

Both instruments comply with the requirements of
the European EMC Directive 2004/108/EC. For
specified immunity all wiring should be in screened
twisted pairs, with the screens earthed in the safe
area.

Install the new scale card by gently pushing the
flexible strip into the slot at the rear of the indicator,
when it reaches the internal end-stop secure it by
pushing the end of the flexible strip downwards so
that the tapered section is held by the rear panel of
the indicator.

Align the self-adhesive printed
scale card onto the flexible
strip and insert the strip into
the indicator as shown below.

Fig 6 Rear terminals

Fig 7 Inserting flexible strip carrying scale card

into slot at the rear of indicator.

10

11

6. CONFIGURATION AND CALIBRATION

Indicators are configured and calibrated via the
four front panel push buttons. All the configuration
functions are contained in an easy to use intuitive
menu that is shown diagrammatically in Fig 8.

Each menu function is summarised in section 6.1
and includes a reference to more detailed
information. When the indicator is fitted with alarms
additional functions are added to the menu which
are described in section 9.3. Throughout this
manual push buttons are shown as P, E, ▼ or ▲,
and legends displayed by the indicator are shown
within inverted commas e.g. 'CAL' and ' ALr2'.

Access to the configuration menu is obtained by
operating the P and E push buttons
simultaneously. If the indicator security code is set
to the default 0000 the first parameter 'FunC' will
be displayed. If a security code other than the
default code 0000 has already been entered, the
indicator will display 'CodE'. Pressing the P button
will clear this prompt allowing each digit of the
code to be entered using the ▲ and ▼ push
buttons and the P button to move control to the
next digit. When the correct four digit code has
been entered pressing E will cause the first
parameter 'FunC' to be displayed. If the code is
incorrect, or a button is not pressed within twenty
seconds, the indicator will automatically return to
the display mode.

6.1 Summary of configuration functions

This section summarises each of the main
configuration functions and includes a cross
reference to a more detailed description. Fig 6
illustrates the location of each function within the
configuration menu. The lineariser and the
optional factory fitted alarms are described
separately in sections 7 and 9.3 of this manual.

Display Summary of function

'FunC' Indicator function

Defines the relationship between the
4/20mA input current and the indicator
display. May be set to:

‘Std’ Standard linear relationship
‘root’ Square root extraction
‘Lin’ 16 segment adjustable

lineariser – see section 7.

See section 6.2

'rESn' Display resolution

Defines the resolution of the least
significant display digit. May be set to
‘1’, ‘2’, ‘5’ or ‘10’ digits.
See section 6.3

'dP' Decimal point

Positions a dummy decimal point
between any of the digits or turns it off.
See section 6.4

Once within the configuration menu the required
parameter can be reached by scrolling through the
menu using the ▲ and ▼ push buttons as shown
in Fig 8. When returning to the display mode
following recalibration or a change to any function,
the indicator will display ‘dAtA’ followed by ‘SAVE’
while the new information is stored in non-volatile
memory.

All new indicators are supplied calibrated as
requested at the time of ordering. If calibration is
not requested, indicators will be supplied with the
following default configuration:

Default Configuration

BA307NE BA327NE

Access code ‘CodE’ 0000 0000
Function ‘FunC’ Linear Linear
Display at 4mA ‘Zero’ 0.0 0.00
Display at 20mA ‘SPAn’ 100.0 100.00
Resolution ‘rESn’ 1 digit 1 digit
Bargraph start ‘BarLo’ ----- 0.00
Bargraph finish ‘BarHi’ ----- 100.00
P button in display mode ‘C-P’ % %
Tare ‘tArE’ Off Off

'CAL' Calibration of the digital display

using an external current source.

Enables the zero and span of the
indicator to be adjusted using an
external current source such as a
calibrator. When used with an accurate
traceable current source this is the
preferred method of calibration.
See section 6.5

'SEt' Calibration of display using internal

references.

Enables the zero and span of the
indicator to be adjusted without the
need for an accurate input current or
disconnection from the 4/20mA loop.
See section 6.6

'bAr' Bargraph format and claibration

Only the BA327NE has a bargraph the
bargraph may be conditioned to start
from left, right or centre of the display,
or it may be disabled. When optional
alarms are fitted it can also display both
alarm setpoints and the measured
value. The bargraph may be calibrated
to start and finish at any value within
the indicator’s calibrated digital
display.See section 6.7

12

Display Summary of function

'C - - P' Function of P push button

The indicator may be configured to
display the input current in milliamps, or
the input current as a percentage of the
4/20mA input when the P push button is
operated in the display mode.
See section 6.8

'tArE' Tare function

When enabled the tare function sets
the indicator display to zero when the E
push button is operated in the display
mode.
See section 6.9

'CodE' Security code

Defines a four digit numeric code that
must be entered to gain access to the
configuration menu. Default code 0000
disables this security function and
allows unrestricted access to all
conditioning functions.
See section 6.10

'rSEt' Reset

Contains two sub-functions, ‘ConF’
which returns the indicator to the
default conditions shown in section 6.0
and ‘LtAb’ which returns the lineariser
to the default conditions shown in
section 7.3. To prevent accidental use
both resets must be confirmed by
entering ‘5urE’ before they will be
executed.
See section 6.11

6.2 Indicator function: ‘FunC’

This configuration function defines the relationship
between the indicator’s 4/20mA input current and
the indicator’s display. Three alternatives are
available:

‘Std’ Standard linear relationship

‘root’ Square root extraction
‘Lin’ 16 segment adjustable lineariser

To reveal the existing indicator function select
'FunC' from the configuration menu and press P.
If the function is set as required, press E to return
to the menu, or press the ▲ or ▼ button to change
the setting, followed by the E button to return to the
configuration menu.

‘Std’ Linear

Provides a linear relationship between the
4/20mA indicator input current and the
indicator display.

‘root’ Square root extraction

Primarily intended to linearise the square
law 4/20mA output from differential
flowmeters.

For reference, the following table shows
the output current from a non-linearised
differential flowmeter.
% of full flow Current output mA

2.5 4.01

10.0 4.16

25.0 5.00

50.0 8.00

75.0 13.00

100.0 20.00
When the root function is selected the
indicator will display flow in linear units.

‘Lin’ 16 segment adjustable lineariser

Enables non linear variables to be
displayed by the indicator in linear
engineering units. Use of the lineariser is
described in section 7 of this instruction
manual.

6.3 Resolution: rESn

This function defines the resolution of the least
significant display digit. Decreasing the display
resolution can improve the readability of a noisy
signal. Select ''rESn' from the menu and press P
which will reveal the current display resolution. To
change the resolution press the ▲ or ▼ button to
select 1, 2, 5 or 10 digits, followed by the E button
to enter the selection and return to the
configuration menu.

13

6.4 Position of the decimal point: ‘dP’

A dummy decimal point can be positioned between
any of the digits or it may be absent. To position
the decimal point select 'dP' from the menu and
press P. The decimal point can be moved by
pressing the ▲ or ▼ push button. If a decimal
point is not required it should be positioned beyond
the most or least significant digit. When
positioned as required press the E button to enter
the selection and return to the configuration menu.

6.5 Calibration using an external
current source: ‘CAL’

This function enables the zero and span of the
indicator to be adjusted using an external
calibrated current source. When used with an
accurate traceable current source this is the
preferred method of calibration.

Zero is the indicator display with 4mA input
Span is the indicator display with 20mA input

To calibrate the indicator select 'CAL' from the
configuration menu and press P. The indicator will
display 'ZEro' which is a request for a 4mA input
current. Adjust the external current calibrator to

4.000mA and again press P which will reveal the
current zero display. The flashing digit of the
indicator display can be changed by pressing the
▲ or ▼ buttons, when set as required pressing P
will transfer control to the next digit. When all the
digits have been adjusted, press E to enter the
new zero and return to the 'ZEro' prompt .

Pressing the ▲ button will cause the indicator to
display 'SPAn' which is a request for a 20mA input
current. Adjust the external current calibrator to

20.000mA and again press P which will reveal the
existing span display. The flashing digit of the
indicator display can be changed by pressing the
▲ or ▼ buttons, when set s required pressing P
will transfer control to the next digit. When all the
digits have been adjusted press E to enter the new
span and return to the 'SPAn' prompt. Finally
press E again to return to the configuration menu.

Notes:

a. The indicator input current must be adjusted to

the required value before the zero and span
functions are entered by pressing the P button.

6.6 Calibration using internal reference:
‘SEt’

Using the ‘SEt’ function the indicator can be
calibrated without the need to know the value of
the 4/20mA input current, or to disconnect the
indicator from the 4/20mA loop.

When using the ‘Set’ function the indicator’s
internal reference is used to simulate a 4mA and
20mA input current.

Zero is the display with a simulated 4mA input
Span is the display with a simulated 20mA input

To calibrate the indicator display select 'SEt' from
the configuration menu and press P. The indicator
will display 'ZEro', pressing P

again will reveal the

current display at 4mA. The flashing digit can be
adjusted by pressing the ▲ or ▼ buttons, when
the flashing digit is correct pressing P will transfer
control to the next digit. When all the digits have
been adjusted, press E to return to the 'ZEro'
prompt.

To adjust the display at 20mA, press the ▲ button
which will cause the indicator to display 'SPAn',
pressing P will then reveal the indicator’s existing
display at 20mA. The flashing digit can be
adjusted by pressing the ▲ or ▼ buttons, when
the flashing digit is correct pressing P will transfer
control to the next digit. When all the digits have
been adjusted press E to return to the 'SPAn'
prompt followed by E to return to the ‘SEt’ prompt
in the configuration menu.

6.7 Bargraph format and calibration: ‘bAr’

Only the BA327NE has a bargraph

In addition to a five digit numerical display the
BA327NE has a 31 segment analogue bargraph
which may be configured to start and finish
anywhere within the indicator’s numerical display
range.

To configure the bargraph select 'bAr' from the
configuration menu and press P. The indicator will
display 'tYPE', pressing P again will reveal the
existing bargraph justification which can be
changed to one of the following four or five options
using the ▲ or ▼ button:

b. Indicators may be calibrated at currents other

than 4 and 20mA, withiin the range 3.8 to

21.0mA providing the difference between the
two currents is greater than 4mA. If these
conditions are not complied with, the indicator
displays ‘FaiL’ and aborts the calibration.

c. If the zero current is greater than the span

current the instrument will be reverse acting
i.e. an increasing input current will cause the
display to decrease.

Bargraph justification starts from

‘LEFt’ Left end of display
‘CEntr’ Centre of display
‘riGHT’ Right end of display
‘AlrSP’ Only with alarms – see section 9.3
‘oFF’ Bargraph disabled

When set as required press E to return to the
‘tYPE’ sub-function prompt.

14

The indicator’s digital display at which the
bargraph starts is defined by the ‘bArLo’ sub­function which is selected by pressing the ▲
button followed by the P button which will reveal
the current indicator display at which the bargraph
starts. The flashing digit can be adjusted by
pressing the ▲ or ▼ buttons, when set as required
pressing P will transfer control to the next digit.
When all the digits have been adjusted, press E to
return to the 'bArLo' prompt from which ‘bArHi’
which defines the finishing point of the bargraph
can be selected by pressing the ▲ button. ‘bArHi’
is adjusted in the same way as ‘bArLo’. When set
as required, pressing E twice will return the display
to the ‘bAr’ prompt in the configuration menu.

Note: ‘bArLo’ must be set lower than ‘bArHi’,
incorrect setting is indicated by the bargraph scale
flashing with a single bargraph segment activated.

6.8 Function of the P push button: ‘C - - P’

When the indicator is in the display mode,
operating the P push button will display the input
current in milliamps, or the displayed value as a
percentage of the difference between the displayed
values at 4mA and 20mA inputs.

To check or change the function of the P push
button select 'C - -P' from the configuration menu
and press P to reveal the current setting. Pressing
the ▲ or ▼ button will toggle the setting between
'4-20' the current display in milliamps and 'PC' the
percentage display. When set as required press
E to return to the ‘C - - P’ prompt in the
configuration menu.

6.9 Tare function: ‘tArE’

The tare function is primarily intended for use with
weighing system. When the indicator is in the
display mode and the tare function is activated,
pressing the E button for more than three seconds
will zero the indicator display and activate the tare
annunciator. Subsequent operation of the E push
button for less than 3 seconds will return the
indicator to the gross display and deactivate the
tare annunciator.

To check or change the tare function select 'tARE'
from the configuration menu and press P to reveal
the current setting. Pressing the ▲ or ▼ button
will toggle the setting between 'on' and 'oFF'.
When set as required press E to return to the
‘tARE’ prompt in the configuration menu.

6.10 Security code: ‘CodE’

Access to the instrument configuration menu may
be protected by a four digit security code which
must be entered to gain access. New instruments
are configured with the default security code 0000

which allows unrestricted access to all
configuration functions.

To enter a new security code select 'CodE' from
the configuration menu and press P which will
cause the indicator to display the existing security
code with one digit flashing. The flashing digit can
be adjusted using the ▲ and

▼ push buttons,
when set as required operating the P button will
transfer control to the next digit. When all the
digits have been adjusted press E to return to the
‘CodE’ prompt in the configuration menu. The
revised security code will be activated when the
indicator is returned to the display mode.

Please contact BEKA associates sales department
if the security code is lost.

6.11 Reset to factory defaults: ‘rSEt’

This function enables the indicator and the
lineariser to be quickly returned to the factory
default configurations shown in sections 6.0 and

7.3

To reset the indicator or lineariser select ‘rSEt’ from
the configuration menu and press P, the indicator
will display one of the reset options ‘ConF’ or
‘LtAb’.

‘ConF’ Resets the indicator only to defaults
‘LtAb’ Resets the lineariser only to defaults

Using the ▲ or ▼ push button select the required
sub-function and press P. To prevent accidental
resetting the request must be confirmed by
entering ‘5urE’. Using the ▲ button set the first
flashing digit to ‘5’ and press P to transfer control
to the second digit which should be set to ‘u’.
When ‘5urE’ has been entered pressing the E
button will reset the selected configuration menus
and return the display to the ‘rSEt’ function in the
configuration menu.

6.12 Under and over-range

If the numerical display range of the indicator is
exceeded, all the decimal points will flash as
shown below:

BA307NE BA327NE

Underrange -9.9.9.9 -9.9.9.9.9
Overrange 9.9.9.9 9.9.9.9.9

Although not guaranteed, most indicators will
continue to function normally with an input current
between 1.8mA and 4mA, at lower currents the
instrument will display ‘LPLo’ before it stops
functioning.

Under or overrange of the BA327NE bargraph is
indicated by an activated arrow at the appropriate
end of the bargraph and a flashing bargraph scale.

15

7. LINEARISER

A sixteen segment, seventeen breakpoint (0 to 16)
lineariser may be selected in the ‘FunC’ section of
the configuration menu. The starting point and
slope of each straight line segment are fully
adjustable allowing the indicator to display most
non-linear process variables in linear engineering
units. Each break-point must occur at a current
greater than the preceding break-point and less
than the following break-point, in the range 3.8 to

21.0mA. If this requirement is not observed when
configuring the lineariser the indicator will display
'FaiL' and the configuration adjusted which
produced the error message will be ignored. Fig 9
shows a typical linearised indicator characteristic.

7.1 Lineariser calibration using an external

current source.

This method allows direct calibration of the
lineariser with an external current source and is the
preferred method when traceability is required. If
the exact system non-linearity is unknown, this
method also allows direct calibration from the
variable to be displayed. e.g. the output from a
level sensor in an irregular tank may be displayed
in linear volumetric units by filling the tank with
known incremental volumes and calibrating the
indicator to display the sum of the increments at
each break-point.

The number of break-point required should first be
entered using the 'Add' and 'dEL' functions. In
both these sub-functions the indicator initially
displays the current break-point and the total
number of break-points being used as shown
below.

Fig 9 shows a typical linearising characteristic

Selecting ‘Lin’ in the ‘FunC’ section of the
configuration menu activates the lineariser, this
does not change the configuration menu shown in
Fig 8, but the 'CAL' and 'SEt' functions are
extended as shown in Fig 10. As with a linear
indicator, calibration of the lieariser may be
performed with an external current source using
the 'CAL' function, or with the internal reference
using the 'SEt' function.

The lineariser calibration is retained irrespective of
how the indicator function ‘FunC’ is subsequently
changed. It is therefore possible to select and
deselect the lineariser without having to
reconfigure it each time.

The lineariser calibration may be reset to the
factory default settings without changing the
indicator configure uing the 'LtAb' function
described in section 6.11.

Display Description of function

'Add' Add a break-point

Adds a new break-point before the
displayed break-point. The calibration
of existing break-points is not changed,
but the identification number of all
subsequent break-points is increased
by one.

'dEL' Remove a break-point

Removes the displayed break-point and
joins the preceding break-point to the
following break-point with a straight
line. The identification number of all
subsequent break-points is decreased
by one.

To add a break-point use the ▲ or ▼ button to
select 'CAL' from the configuration menu and press
P which will result in the 'Add' sub-function prompt
being displayed. To enter the sub-function press P
which will reveal the current break-point and the
total number of break-points which have already
been entered. When adding a break-point to a
calibrated indicator, the insertion position for the
new segment can be selected using the ▲ and ▼
push buttons. Each subsequent operation of the
P push button will introduce an additional break­point up to the maximum of 'n:16'.

16

17

CAUTION
When adding break-points to a new indicator,
or following resetting of the lineariser to the
factory defaults using the 'LtAb' function
described in section 6.11, new break-points
should be added between the two default
break-points '0:1' and '1:1'. If new break­points are added before breakpoint '0:1' which
has a default setting of 4mA, it will result in a
'FaiL' error message when the indicator
display is entered.

The delete break-point sub-function 'dEL' operates
in exactly the same way as the 'Add' sub-function
described above. Once within the ‘dEL’ sub­function each time the P button is pressed a break­point is removed. When deleting a break-point from
a calibrated indicator, the break-point to be deleted
can be selected using the ▲ and ▼ push buttons.
The minimum number of break-point is 2, break­points '0:1' and '1:1'.

When the required number of linearising break­points has been entered, return to the linearisation
sub-menu by pressing E. The indicator will display
the 'Add' or 'dEL' prompt depending upon the last
function used. Using the 'Pts' sub-function the
input current at which each break-point occurs and
the corresponding indicator display may now be
defined.

Using the ▲ or ▼ button select the 'PtS' function
in the sub-menu and press P to enter the function
which will display the first break-point '0 : n', where
n is the total number of linearising break-points
entered – see Fig 9. The selected linearising
break-point can be changed using the ▲ and ▼
buttons. When the required linearising break-point
has been selected set the indicator input current to
the exact value at which the break-point is required
and press P

*. Using the ▲ and ▼ buttons and

the P button to move between digits, enter the
required indicator display at this break-point.

When set as required, press the E push button to
enter the required indicator display and return to
the sub-menu from which the next beak-point can
be selected.

* Note: The indicator input current must be

adjusted to the required value before the P button
is operated to enter the required indicator display.

7.2 Lineariser calibration using the internal
reference.

The ‘SEt’ function enables the lineariser to be
calibrated without the need for an accurate
external current source. Throughout the calibration
the indicator input current may be any value
between 4 and 20mA.

The ‘SEt’ functions contains four sub-functions.

Display Description of function

'Add' Add a break-point

Adds a new break-point before the
displayed break-point. The calibration
of existing break-points is not changed,
but the identification number of all
subsequent break-point is increased by
one.

'dEL' Remove a break-point

Removes the displayed break-point
and joins the preceding segment to the
following segment with a straight line.
The identification number of all
subsequent break-points is decreased
by one.

'in' Defines the current at which break-

point occurs.

Enables the required current at each
break-point to be defined without
having to input an accurate input
current to the indicator.

'diSP' Defines indicator display at break-

point.

Enables the indicator display at each
break-point to be defined.

The number of break-point required should first be
entered using the 'Add' and 'dEL' sub-functions.
In both these sub-functions the indicator initially
displays the current break-point and the total
number of break-point being used as shown below.

Error message
If during calibration the indicator displays a
'FAiL' error message the current at which the
selected break-point is being set is not above
the proceeding break-point or is not below the
following break-point.

When all the break-points have been calibrated
pressing E twice will return the indicator to the
‘CAL’ function in the configuration menu.

To add a break-point using the ▲ or ▼ button
select 'SEt' from the configuration menu and press
P which will result in the 'Add' sub-function prompt
being displayed. To enter the sub-function press P
which will reveal the current break-point and the
total number of break-point which have already
been entered. Each subsequent operation of the
P push button will introduce an additional break-

18

point up to the maximum of 'n:16'. When adding a
break-point to a calibrated indicator, the insertion
position for the new segment can be selected
using the ▲ and ▼ push buttons.

CAUTION
When adding break-points to a new indicator,
or following resetting of the lineariser to the
factory defaults using the 'LtAb' function
described in section 6.11, new break-points
should be added between the two default
break-points '0:1' and '1:1'. If new break­points are added before breakpoint '0:1' which
has a default setting of 4mA, it will result in a
'FaiL' error message when the indicator
display is entered.

The delete break-point, sub-function 'dEL' operates
in exactly the same way as the 'Add' sub-function
described above. Once within the ‘dEL’ function
each time the P button is pressed a break-point is
removed. When deleting a break-point from a
calibrated indicator, the break-point to be deleted
can be selected using the ▲ and ▼ push buttons.
The minimum number of break-point is 2, break­points '0:1' and '1:1'.

When the required number of linearising break­point has been entered, return to the linearisation
sub-menu by pressing E. The indicator will display
the 'Add' or 'dEL' prompt depending upon the last
sub-function used. The indicator input current and
corresponding indicator display at each break­point, which is the segment finishing point as
shown in Fig 8, can now be entered using the ‘in’
and ‘diSP’ sub-functions.

Using the ▲ or ▼ button select 'in' from the sub­menu and press P which will reveal the starting
point for the first segment '0:n', where n is the total
number of break-point entered. Press P and use
the ▲ and ▼ buttons and the P button to move
between digits, to enter the input current in
milliamps at which the first break-point is required,
usually 4.000mA. When set as required, press E
to return to the ‘0 : n’ prompt from which the next
break-point can be selected using the ▲ and ▼
buttons. When the required break-point has been
selected press P and set the indicator input current
at this break-point. Repeat this procedure until the
indicator input current at all the break-points has
been defined and then return to the ‘in’ sub­function by pressing the E button.

the required indicator display at the first break­point. When set as required, press E to return to
the ‘0 : n’ prompt from which the next break-point
can be selected using the ▲ or ▼ buttons. When
the required break-point has been selected press
P and set the required indicator display at this
break-point.

Repeat this procedure until the indicator display at
all the break-points has been defined and then
return to the ‘SEt’ function in the configuration
menu by pressing the E

button twice.

7.3 Lineariser error message

If an attempt is made to position a break-point at a
current which is not greater than the current of the
preceding break-point, or at a current which is not
less than the current of the following break-point,
the error message ‘FAiL’ will be displayed. This
error message will also be displayed if an attempt
is made to position a break-point outside the
current range 3.8 to 21.0mA.

7.4 Under and over-range

The lineariser does not change the under and
over-range indication described in section 6.12. At
input currents below that specified for the first
break-point '0:n', the indicator will continue to use
the specified slope of the first segment. Although
not guaranteed, most indicators will continue to
function normally with an input current between

1.8mA and 4mA, at lower currents the instrument
will display ‘LPLo’ before it stops functioning.

At input currents above that specified for the last
break-point 'n:n', the indicator will continue to use
the slope specified for the last lineariser segment.

7.5 Lineariser default configuration

When the lineariser is reset to the factory defaults
using the ‘LtAb’ function described in section 6.11,
the defaults conditions are:

BA307NE BA327NE

First break-point '0:1' 4mA 0.0 0.00
Second break-point '1:1' 20mA 100.0 100.00

Indicator display

The corresponding indicator display at each of the
break-points can now be defined using the ‘diSP’
sub-function Using the ▲ and ▼ buttons select
the ‘diSP’ sub-function and press P which will
reveal the starting point for the first break-point
'0:n', where n is the total number of break-points
entered. Press P and use the ▲ and ▼ buttons
and the P button to move between digits, to enter

19

8. MAINTENANCE

8.1 Fault finding during commissioning

If an indicator fails to function during
commissioning the following procedure should be
followed:

Symptom Cause Solution

No display Incorrect wiring Check wiring

There should be

0.6 to 1.2V
between terminals
1 & 3 with terminal

1 positive.

With an optional

backlight which is

loop powered,

there should be

3.4 to 5V between

terminals 3 & 12

with terminal 12

No display,
0V between
terminals 1 & 3.

All decimal points
flashing.

Unstable display 4/20mA input is

Unable to enter
configuration
menu.

Incorrect wiring

or no power

supply.

Underrange if

–ve sign

displayed or

overrange.

noisy.

Incorrect

security code

entered.

positive.

Check supply

voltage and

voltage drop

caused by all the

instruments in the

loop.

Recalibrate the

indicator to reduce

the maximum

display.

Reduce noise on

4/20mA input

and/or decrease

indicator

resolution.

Enter correct

security code, or

contact BEKA if

the code has been

lost.

8.2 Fault finding after commissioning

The IEC guidance on maintenance procedures

BS EN 60079-17:2014 Electrical installations
inspection and maintenance permits live

maintenance in Zone 2 if a risk analysis
demonstrates that this does not introduce an
unacceptable risk. The removal of covers [opening
of Ex n panel enclosure in which the indicator is
mounted] is permitted if this can be done without
contaminating the interior of the instrument with
dust or moisture. Some end-users may prefer not
to permit live maintenance to minimise risk.

If an indicator fails after it has been functioning
correctly, follow the procedure shown in section

8.1. If this does not reveal the cause of the fault, it
is recommended that the instrument is replaced.

8.3 Servicing

All BA307NE and BA327NE loop powered
indicators are interchangeable if the required
optional backlight and alarms are fitted. A single
spare instrument may quickly be recalibrated to
replace any instrument that is damaged or fails.
No attempt should be made to repair instruments
at component level.

We recommend that faulty instruments
are returned to BEKA associates or to
your local BEKA agent for repair.

8.4 Routine maintenance

The mechanical condition of the instrument and
electrical calibration should be regularly checked.
Inspection frequency should be chosen to suit the
environmental conditions.

8.5 Guarantee

Indicators which fail within the guarantee period
should be returned to BEKA associates or your
local BEKA agent. It is helpful if a brief description
of the fault symptoms is provided.

8.6 Customer comments

BEKA associates is always pleased to receive
comments from customers about our products and
services. All communications are acknowledged
and whenever possible, suggestions are
implemented.

ENSURE PLANT SAFETY BEFORE

STARTING MAINTENANCE

Live maintenance within the hazardous
area should only be performed when it is
permitted by risk analysis or when there
is no risk of a flammable atmosphere
being present.

20

9. ACCESSORIES

9.1 Scale card

Both models have a window on the right hand side
of the display through which to view a scale card
showing the units of measurement such as

o

C,
mBar or RPM. New indicators are fitted with a
scale card showing the units of measurement
specified when the indicator was ordered, if the
units are not specified a blank scale card will be
fitted. A pack of scale cards pre-printed with
common units of measurement is available as an
accessory. These can easily be fitted to the
indicator on-site without opening the indicator
enclosure or removing it from the panel enclosure.
See section 5.5 of this instruction manual.

Less common units of measrement can be hand
printed onto the scale card using a variety of
techniques, or custom printed cards are available
from BEKA.

9.2 Tag information

New indicators can be supplied with tag or
application information laser etched onto the rear
of the instrument. This tag information is not
visible from the front of the instrument after
installation.

9.3 Stainless steel support plate

When a BA307NE or BA327NE indicator is
installed into an enclosure panel less than 1mm
thick or in a non-metallic enclosure panel, a
support plate may be required as explained in
section 5.2c of this manual. This plate prevents
the enclosure panel being distorted or creeping
when the indicator panel clamps are tightened and
ensures that the joint between the indicator and the
panel enclosure in which it is mounted remains
sealed.

9.4 Alarms

CAUTION

These alarms outputs should not be used for
critical safety applications such as an
emergency shut down system.

Both models can be supplied with factory fitted
dual solid state, single pole alarm outputs. Each
alarm output may be independently conditioned as
a high or low alarm with a normally open or
normally closed output in the non-alarm condition.

When the 4/20mA current powering the indicator is
removed both alarm outputs will open irrespective
of configuration. The open circuit condition should
therefore be chosen as the alarm condition when
designing an alarm system. Fig 11 illustrates the
conditions available and shows which are fail safe.

When an alarm occurs an alarm annunciator on
the indicator's front panel is activated and if
required the numerical display can alternate
between the measured value and the alarm
channel identification ‘ALr1’ or ‘ALr2’.

CAUTION

The alarms are activated by the indicator’s
numerical display. Use of the Tare Function
‘tArE’ will change the numerical display, the
alarms will continue to function at the original
displayed value, but this will correspond to a
different input current.

Fig 11 Alarm outputs

Configurable functions for each alarm include
adjustable setpoint, hysteresis, alarm delay and
alarm accept.

9.4.1 Solid state output

Each alarm output is a galvanically isolated single
pole solid state switch as shown in Fig 12. The
output is polarised and current will only flow in one
direction, terminals 8 and 10 should therefore be
connected to the positive side of the circuit being
switched.

Ron = less than 5Ω + 0.7V
Roff = greater than 1MΩ

Fig 12 Equivalent circuit of each alarm output

9.4.2 Type nA certification

Each alarm output is a separate galvanically
isolated Ex nA circuit with the following input
parameters:

Ui = 30V dc
Ii = 200mA

This allows each alarm output to switch any dc
circuit providing that in normal operation the
maximum supply voltage is not greater than 30V
dc and the switched current is not greater than
200mA.

Providing that the BA307NE or BA327NE indicator
is correctly installed in a panel enclosure located in
Zone 2 complying with the requirements for Ex n
protection, the two alarm outputs may be used to
switch suitably protected equipment located in any
Zone of a hazardous area, or equipment located in
a safe area..

21

Fig 13 Typical alarm application

(Shown without recommended screened cables)

To comply with the requirements of
BS 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. These two
requirements are frequently satisfied by using fuse
holders with easily removable fuses and removing
the fuses to achieve isolation. This is a
satisfactory method at the low voltages and
currents common in instrumentation systems.
Clear identification of, and easy access to the
means of isolation is essential for their effective
use. It is also necessary to ensure that the
maintenance procedure makes sure that
unauthorised re-closure of the switches does not
occur. It is not considered necessary to have a
means of isolation or electrical protection for the
screen. Figure 20 illustrates an example of this
type of switch fuse terminal block.

Fig 13 shows a typical application in which a
BA307NE or BA327NE indicator mounted in an
Ex n panel enclosure located in Zone 2 is
displaying the output from an Flameproof Ex d
2-wire transmitter located in Zone 1. Alarm 1 is
switching an Ex e sounder in Zone 1 and alarm 2 is
switching a sounder located in the safe area.

For some application Ex nA instrumentation
energised by a current limited power supply or
instrument that can be switched off, is often
considered adequate and to comply with the
requirements of the standard.

22

23

9.4.3 Configuration and adjustment

When optional alarms are fitted to a loop powered
indicator the configuration menu is extended as
shown in Fig 12. The additional functions appear
between the ‘SEt’ and the ‘C- - P’ functions for the
BA307NE and between ‘bAr’ and ‘C- -P’ for the
BA327NE indicator. For simplicity, Fig 12 only
shows the additional functions for alarm 1, but
alarm 2 has identical functions.

The following table summaries each of the alarm
configuration functions and includes a cross
reference to more detailed information.

Summary of alarm configuration functions

Display Description of function

'EnbL’ Alarm enable

Enables or disables the alarm without
changing the alarm parameters.
See section 9.4.4

'SP1' Alarm setpoint 1

Adjusts the alarm setpoint. The alarm
is activated when the indicator display
equals the setpoint.
See section 9.4.5

'Hi.Lo' Alarm function

Defines the alarm function as High or
Low.
See section 9.4.6

'no.nC' Normally open or normally closed

output

Sets the alarm output open or closed in
the non-alarm condition.
See section 9.4.7

'HStr' Hysteresis

Adjusts the alarm hysteresis.
See section 9.4.8

'dELA' Alarm delay time

Introduces adjustable delay between
the display equalling the setpoint and
the alarm output being activated.
See section 9.4.9

'SiL' Alarm silence time

Defines the time that the alarm output
remains in the non-alarm condition
following acceptance of an alarm.
See section 9.4.10

‘FLSH’ Flash display when alarm occurs

When enabled, alternates the
numerical display between process
value and alarm reference, ‘ALr1’ or
‘ALr2’, when an alarm output is
activated.
See section 9.4.11

'ACSP' Access setpoint

Sub-menu which enables direct access
to the alarm setpoints from the indicator
display mode, and defines a separate
security code.
See section 9.4.12

24

9.4.4 Alarm enable: ‘EnbL’

This function allows each alarm to be enabled or
disabled without altering any of the alarm
parameters. To enable or disable the alarm select
'EnbL' from the alarm menu and press P which will
reveal the current setting ‘on’ or ‘oFF’. The
function can be changed by pressing the ▲ or ▼
button followed by the E button to return to the
alarm menu.

9.4.5 Setpoint adjustment: ‘SP1’ and ‘SP2’

The setpoint of each alarm may be positioned
anywhere in the numerical display of the indicator
providing that this corresponds to an input current
between 3.8 and 20.2mA. e.g. If the indicator has
been calibrated to display 0 with 4mA input and
10000 with 20mA input, the two alarm setpoints
may be positioned anywhere between -125 and

10125.
To adjust the setpoint select 'SP1' or 'SP2' from the
alarm configuration menu and press P which will
reveal the existing alarm setpoint. The flashing
digit of the setpoint can be adjusted using the ▲
and ▼ push buttons, and the P button to move
control to the next digit. When the required
setpoint has been entered press E to return to the
alarm configuration menu.
The alarm setpoints may also be adjusted when
the indicator is in the display mode, see section

9.4.12.

9.4.6 Alarm function: ‘Hi.Lo’

Each alarm can be independently conditioned as a
high alarm or as a low alarm. To check or change
the alarm function select 'Hi.Lo' from the alarm
menu and press P to reveal the current setting.
The function can be changed by pressing the ▲ or
▼ button followed by the E button to return to the
alarm menu.

To check or change the alarm output status, select
'no.nC' from the alarm configuration menu and
press P to reveal the setting. The function may be
changed by pressing the ▲ or ▼ button followed
by the E button to return to the alarm configuration
menu.

9.4.8 Hysteresis: HStr

Hysteresis is shown in the units that the indicator
has been calibrated to display.
To adjust the hysteresis select 'HStr' from the
alarm menu and press P which will reveal the
existing figure. The flashing digit can be adjusted
using the ▲ and ▼ push buttons, and the P
button will move control to the next digit. When the
required hystersis has been entered press E to
return to the alarm configuration menu.

e.g. An indicator calibrated to display 0 to 10000,
with a high alarm set at 9000 and hysteresis of 200
will perform as follows:

The high alarm will be activated when
increasing indicator display equals 9000, but
will not reset until the indicator display falls
below 8800.

9.4.9 Alarm delay: dELA

This function delays activation of the alarm output
for an adjustable time following the alarm condition
occurring. The delay can be set in 1 second
increments between 0 and 3600 seconds. If a
delay is not required zero should be entered. To
adjust the delay select 'dELA' from the alarm
configuration menu and press P which will reveal
the existing delay. The flashing digit of the delay
can be adjusted using the ▲ and ▼ push buttons,
and the P button to move control to the other digits.
When the required delay has been entered press
E to return to the alarm menu.

9.4.7 Alarm output status: ‘no.nC’

Configures the solid state alarm output to be open
‘no’ or to be closed ‘nC’ in the non-alarm condition.
When deciding which is required, care should be
taken to ensure that the alarm output is fail safe as
illustrated in Fig 9.

‘no’ Alarm output open in non-alarm condition

‘nC’ Alarm output closed in non-alarm condition

CAUTION
When the 4/20mA supply is removed from the
loop powered indicator, both alarm outputs
will open irrespective of conditioning.
Therefore for fail safe operation both alarm
outputs should be conditioned to be open in
the alarm condition ‘nC’.

e.g. An indicator with a high alarm set at 9000 and
an alarm delay of 30 seconds will perform as
follows:

The alarm annunciator will start to flash when an
increasing indicator display equals 9000, but the
alarm output will not be activated until the alarm
condition has existed continuously for 30 seconds.
When the alarm output is activated, the alarm
annunciator will stop flashing and become
permanently activated.

If the ‘FLSH’ function, which flashes the indicator
display when an alarm occurs, has been enabled,
it will not start to function until the alarm output is
activated.
See section 9.4.11

25

9.4.10 Alarm silence time: SiL

This function is primarily intended for use in small
installations where the alarm output directly
operates an alarm annunciator such as a sounder
or beacon. When the alarm silence time, which is
adjustable between 0 and 3600 seconds in 1
second increments, is set to any figure other than
zero, the P push button becomes an alarm accept
button. After an alarm has occurred, operating the
P button will cause the alarm output to revert to the
non-alarm condition for the programmed alarm
silence time. If the alarm condition still exists at
the end of the silence time, the alarm output will be
reactivated. During the silence time the indicator
alarm annunciator will flash until the silence time
expires or the alarm is cleared.

If the ‘FLSH’ function, which flashes the indicator
display when an alarm occurs has been enabled,
it will only function when the alarm output is
activated, not during the silence time. See section

9.4.11

To adjust the alarm silence time select 'SiL' from
the alarm configuration menu and press P which
will reveal the existing silence time. The flashing
digit of the silence time can be adjusted using the
▲ and ▼ push buttons, and the P button to move
control to the other digits. When the required
silence time has been entered press E to return to
the alarm menu.

indicator is in the display mode is provided by a
separate security code.

This direct setpoint access menu is enabled and
the separate security code entered from the
'ACSP' function in the alarm configuration menu as
shown in Fig 12. To change the menu parameters
select 'ACSP' from the configuration menu and
press P which will display the enable prompt
'EnbL'. Press P again to reveal if the direct access
menu is 'on' or 'oFF'. The ▲ or ▼ button will
toggle the display between the two conditions.

If 'oFF' is selected, the operator will not have
access to the setpoints from the display mode.
Return to the 'ACSP' prompt in the main menu by
pressing E twice.

If 'on' is selected, the operator will have direct
access to the alarm setpoints from the display
mode via a separate optional security code. To
define this four digit security code press P

to return

to the 'Enbl' prompt followed by the ▲ or ▼ button
to select the access code prompt 'ACCd'.
Pressing P will reveal the current security code.
Each digit of the code may be changed by
operating the ▲ and ▼ push buttons, and the P
button to move control to the next digit. When the
required code has been entered, press E twice to
return to the 'ACSP' prompt in the configuration
menu.

9.4.11 Flash display when alarm occurs ‘FLSH’
In addition to the two alarm annunciators on the
top left hand corner of the indicator display which
show the status of both alarms, this function
provides an even more conspicuous indication that
an alarm condition has occurred.

When enabled, the function alternates the indicator
display between the numerical value and the alarm
reference, ‘ALr1’ or ‘ALr2’, when the alarm output
is activated. If both alarm outputs are activated,
the alarm references are displayed in sequence.

To enable or disable the function select 'FLSH'
from the alarm menu and press P which will reveal
the current setting ‘on’ or ‘oFF’. The function can
changed by pressing the ▲ or ▼ button followed
by the E button to return to the alarm menu.

9.4.12 Access setpoint in display mode: ACSP

This function enables a separate menu providing
access to the alarm setpoints from the display
mode by simultaneously operating the P and ▲
push buttons. An operator can therefore adjust the
alarm setpoints without having access to the
indicator configuration menu. Protection against
accidental adjustment of the setpoints when the

Default code 0000 will disable the security code
allowing direct access to the setpoints in the
display mode by pressing the P and ▲ buttons
simultaneously. Unless otherwise requested new
instruments with alarms are supplied with this
function disabled and the security code set to

0000.

9.4.13 Adjusting alarm setpoints from the
display mode

Access to the alarm setpoints from the indicator
display mode is obtained by operating the P and ▲
push buttons simultaneously as shown in Fig 15. If
the setpoints are not protected by a security code
the alarm setpoint prompt 'SP1' will be displayed.
If the setpoints are protected by a security code,
'Code' will be displayed first. Pressing P again will
enable the alarm security code to be entered digit
by digit using the ▲ and ▼ buttons to change the
flashing digit, and the P push button to move
control to the next digit. If the correct code is
entered pressing E will cause alarm setpoint
prompt 'SP1' to be displayed. Pressing the ▲ or
▼ button will toggle the display between the two
alarm setpoint prompts 'SP1' and 'SP2'.

If an incorrect security code is entered, or a button
is not pressed within twenty seconds, the indicator
will automatically return to the display mode.

26

9.4.14 Displaying setpoints on BA327NE
bargraph

One of the selectable bargraph formats ‘AlrSP’
allows a low or a high setpoint plus the displayed
value to be represented, or a low and a high
setpoint plus the displayed value to be represented
by the bargraph as shown in Fig 16.

Fig 16 Displayed value and setpoints on bargraph

The bargraph area below the low alarm setpoint
and the area above the high alarm setpoint are
activated. The displayed variable is represented
by an activated bar which moves between these
low and high alarm setpoints.

Fig 15 Setpoint adjustment from the display mode

To adjust an alarm setpoint select 'SP1' or 'SP2'
and press P which will reveal the current setting.
Each digit of the setpoint may be adjusted using
the ▲ and ▼ push buttons, and the P button to
move control to the next digit. When the required
setpoint has been entered, pressing E will return
the display to the 'SP1' or 'SP2' prompt from which
the other setpoint may be selected, or the indicator
may be returned to the display mode by pressing E
again.

Note: With the indicator in the display mode, direct
access to the alarm setpoints is only available
when the ACSP menu is enabled - see section

9.4.12

When the activated bar representing the displayed
variable is adjacent to the area representing the
low or high alarm setpoints, the bar flashes.
When a displayed variable equals the low or high
alarm the complete bargraph representing the
activated alarm flashes irrespective of whether the
alarm output has been delayed or cleared.

For this function to operate SP1 must be
conditioned as a low alarm and SP2 as a high
alarm; SP1 must always be less than SP2.
Incorrect configuration is shown by a flashing
bargraph scale with no activated bars.

27

9.5 Display backlight

The BA307NE and BA327NE loop powered
indicators can be supplied with a factory fitted
backlight that may be loop or separately powered.

When loop powered the backlight produces green
background illumination enabling the display to be
read at night or in poor lighting conditions. No
additional power supply or field wiring are required,
but the indicator voltage drop is increased. When
separately powered the backlight is brighter, but
additional field wiring is required.

Fig 17 Terminals for optional backlight

9.5.1 Loop powering the backlight

The backlight is loop powered by connecting it in
series with the indicator’s 4/20mA input as shown
in Fig 18, which increases the maximum indicator
voltage drop from 1.2 to 5V.

9.5.2 Separately powering the backlight

The optional backlight may also be powered from a
separate power supply as shown in Fig 19.

Fig 19 Separately powered backlight

The separately powered backlight is a current sink
which will draw a constant 22.5mA when the
supply voltage is equal to or greater than 9V. At
lower supply voltages the backlight will continue to
function but with reduced brilliance and will draw
less current.

Fig 18 Loop powered backlight

The ATEX certificate therefore only specifies the
maximum safety input voltage Ui for terminals 12
and 14.

Ui = 30V

To comply with the requirements of
BS 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. These two
requirements are frequently satisfied by using fuse
holders with easily removable fuses and removing
the fuses to achieve isolation. This is a
satisfactory method at the low voltages and
currents common in instrumentation systems.
Clear identification of, and easy access to the
means of isolation is essential for their effective
use. It is also necessary to ensure that the
maintenance procedure makes sure that
unauthorised re-closure of the switches does not
occur. It is not considered necessary to have a
means of isolation or electrical protection for the
screen. Figure 20 illustrates an example of this
type of switch fuse terminal block.

For some application Ex nA instrumentation
energised by a current limited power supply that
can be switched off, is often considered adequate.

APPENDIX 1
Use in an Ex e or Ex p panel enclosure located
in Zone 2.

The ATEX and IECEx certificates for the BA307NE
and BA327NE indicators permit the instruments to
be installed in an Ex e increased safety panel
enclosure located in Zone 2, or in an Ex p
pressurised panel enclosure located in a Zone 2
hazardous area.

A1.1 Installation in Ex e panel enclosure within
Zone 2

Installation of a BA307NE or BA327NE indicator in
an Ex e increased safety panel enclosure does not
invalidate the Ex e panel's ingress and impact
protection as the front of both indicators comply
with Ex e ingress and impact requirements.
Although mounted in an Ex e panel enclosure, the
BA307NE or BA327NE remain protected by
Group II Category 3G Ex nA ic IIC T5 Gc
certification described in the main section of this
manual and the front panel push button contacts
remain intrinsically safe Ex ic.

28

In normal operation i.e. without faults, the
maximum power dissipation within the indicator is
less than 150mW which is very unlikely to modify
the internal temperature of the Ex e panel
enclosure.

CAUTION
BA307NE and BA327NE indicators should
not be installed in an Ex e panel enclosure
located in Zone 1.

There are four design requirements:

1. The indicator should be installed generally as
shown in section 5 and Fig 20.

2. The certificate specifies that the indicator
should be connected to a limited energy
4/20mA circuit having a maximum output
current of 200mA. A low voltage supply,
usually 24V, that is safe in normal operation
and suitable for live connection i.e. CE
marked, is usually considered acceptable.

Fig 20 Typical installation in Ex e panel enclosure

A1.2 Zone 2 installation in Ex p enclosure

Installation of a BA307NE or BA327NE indicator in
an Ex p pressurised panel enclosure does not
invalidate the pressurised panel's ingress and
impact protection as the front of the indicator
complies with Ex p ingress and impact
requirements. Although mounted in an Ex p panel,
enclosure the BA307NE or BA327NE remain
protected by Group II Category 3G Ex nA ic IIC T5
Gc certification described in the main section of
this manual and the front panel push button
contacts remain intrinsically safe Ex ic.

CAUTION
BA307NE and BA327NE indicators should
not be installed in an Ex p panel enclosure
located in Zone 1.

3. Wiring should comply with Clause 9 of
BS EN 60079-14.

4. The 4/20mA input must be able to supply the

1.2V required to operate the indicator. This
increases to 5.0V if the indicator includes an
optional loop powered backlight. See 9.5.1.

Fig 21 Typical installation in Ex p panel enclosure

A1.3 Installation in an Ex p panel enclosure
within Zone 2.

Fig 21 shows a typical installation within an Ex p
pressurised enclosure located in Zone 2.

The BA307NE and the BA327NE may be driven
directly from any instrument with a 4/20mA output
located in the safe area or from apparatus located
within the Ex p panel enclosure.

There are five design requirements:

1. The indicator must be installed in the panel of
an Ex p enclosure generally as shown in
section 5 of this manual and in Fig 21.

2. The four vents at the rear of the indicator
enclosure shown in Fig 22 must not be
obstructed.

3. The certificate specifies that the indicator

should be connected to a limited energy
4/20mA circuit having a maximum output
current of 200mA. An instrument located in
the safe area that is safe in normal operation
and has a 4/20mA output suitable for live
connection i.e. CE marked, is usually
considered acceptable.

29

4. Wiring should comply with Clause 9 of
BS EN 60079-14:2008.

5. The 4/20mA input must be able to supply the

1.2V required to operate the indicator. This
increases to 5.0V if the indicator includes an
optional loop powered backlight. See 9.5.1

Fig 22 Position of rear vents

30

APPENDIX 2
ATEX dust certification

In addition to ATEX certification permitting
installation in Zone 2 gas atmospheres which is
described in the main section of this instruction
manual, the BA307NE and the BA327NE also
have ATEX Ex tc certification, allowing installation
in Zone 22 combustible dust atmospheres when
mounted in an Ex t panel enclosure.

A2.1 Zones and Maximum Surface

Temperature

Both indicators have been certified as Group II
Category 3D Ex tc IIIC T80°C Dc IP20 apparatus
with a Ta of –40°C to +70C. This is dust ignition
protection by enclosure complying with
BS EN 60079-31 Equipment dust ignition

protection by enclosure "t".

When mounted in an Ex t panel enclosure as
specified in section 5 of this instruction manual and
complying with the installation requirements of
BS EN 60079-14 the indicators may be installed in:

Zone 22 explosive atmosphere in the form of

a cloud of combustible dust in air is
not likely to occur in normal
operation, but if it does occur, will
only persist for a short period.

Be used with dusts having a Minimum Ignition
Temperature of:

Dust cloud 120°C

A2.2 Installation

All the circuits shown in the main section of this
manual for indicator installations in Zone 2
flammable gas atmospheres, may also be used for
Zone 22 combustible dust applications. The
indicator should be installed in an Ex t panel
enclosure located within Zone 22. The panel
enclosure containing the indicator should be
located where the minimum amount of dust will
accumulate on them and the installation should be
as specified in section 5 of this instruction manual
and comply with the requirements of EN 60079-14.

BS EN 60079-14 requires that 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 that can be switched off is
often considered adequate.

A2.3 Maintenance

The BA307NE and BA327NE front panel keypads
are intrinsic safe Ex ic which allows them to be
operated in Zone 22

The IEC guidance on maintenance procedures
EN 60079-17 permits live maintenance in Zone 22
if a risk analysis demonstrates that this does not
introduce an unacceptable risk. The removal of
covers [opening of Ex tc enclosure] is permitted if
this can be done without contaminating the interior
of the enclosure and instrument with dust or
moisture. Some end-users may prefer not to
permit live maintenance to minimise risk.

.

Dust layer on indicator 155°C
up to 5mm thick.

Dust layer on indicator Refer to
over 5mm thick.

At an ambient temperature between -40 and +70°C

*

* BS EN 60079-14

* Unlikely occurrence in Zone 22

ENSURE PLANT SAFETY BEFORE

STARTING MAINTENANCE

Live maintenance within the hazardous
area should only be performed when it is
permitted by risk analysis or when there
is no risk of a flammable atmosphere
being present.

Before closing the Ex tc enclosure
ensure that the sealing gaskets are
undamaged and free from dirt and
foreign bodies.

Inspection of the indicator’s mechanical condition
and removal of accumulated dust from the front of
the indicator and the outside of the Ex tc enclosure
should be performed regularly. The interval
between inspections depends upon environmental
conditions. Removal of flammable dust should be
performed with care to avoid creating a dust cloud.

31

APPENDIX 3
IECEx gas and dust certification

IECEx is a global certification scheme for explosion
protected products which aims to harmonise
international certification standards. For additional
information about the IECEx certification scheme
and to view the BEKA associate certificates, please
visit www.iecex.com

A3.1 IECEx Certificate of Conformity

The BA307NE and the BA327NE loop powered
indicators and the optional accessories have been
issued with an IECEx Certificate of Conformity
number IECEx ITS 14.0026X that specifies the
following certification codes:

Ex nA ic IIC T5 Gc
Ex tc IIIC T80°C Dc IP66
Ta = -4 0° C t o 7 0 ° C

The specified gas and dust safety parameters are
identical to the ATEX safety parameters described
in the main section and Appendix 1 and 2 of this
manual.

APPENDIX 4

ETL & cETL certification for installations in
USA and Canada.

A4.0 cETL Mark

For installations in the USA and Canada, the
BA307NE and BA327NE indicators have ETL and
cETL Ex nA and Ex tc approval, Control Number

4008610. Copies of the Authorisation to Mark may
be downloaded from the BEKA associates website

www.beka.co.uk

or requested from the BEKA

associates sales office

A4.1 ETL and cETL certification

The US and Canadian standards used for
assessment and certification of the BA307NE and
BA327NE are listed on the cETL Authorisation to
Mark.

ETL codes for USA

Class I Zone 2 AEx nA ic IIC T5 Gc
Zone 22 AEx ic tc IIIC T80ºC Dc

-40ºC ≤ Ta ≤ 60ºC

The IECEx certificate may be downloaded from the
BEKA associates website www.beka.co.uk, from
the IECEx website www.iecex.com or requested
from the BEKA sales office.

A3.2 Installation

The IECEx and ATEX certificates specify identical
safety parameters and installation requirements for
both indicators. The ATEX installation
requirements specified in the main section of this
manual and in Appendix 1 & 2 may therefore be
used for IECEx installations which should comply
with IEC 60079-14 Electrical installations design,
selection and erection. The local code of practice
should also be consulted.

cETL codes for Canada

Ex nA ic IIC T5 Gc
Ex n IIC T5 Gc
Ex ic tc IIIC T80ºC Dc
Class III Div 2 Class II Div 2 Gp F G
Ta = -40°C to 60°C

The ETL and cETL safety parameters are the
same as the ATEX and IECEx parameters,
therefore the systems shown in the main section of
this manual and in Appendix 1 may be used for US
and Canadian installations subject to complying
with the local codes of practice.

The Indicator's front panel push button contacts
are non incendive and have been certified
intrinsically safe Ex ic, without the need for an
external Zener barrier or galvanic isolator. This is
the 'ic' code shown on the instrument's certification
label and on the ETL Authorisation to Mark. This
allows the loop powered indicator to be adjusted
and configured live when installed in a Zone 2 or
22 hazardous areas. These loop powered
indicators are not intrinsically safe and therefore
external Zener barriers or galvanic isolators are not
required.