BEKA BA327NE User manual

Issue: 3
1st Novemeber 2017
BA307NE & BA327NE
Ex nA & Ex tc
loop-powered
panel mounting indicators
Issue 3

2
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 Ppush button
6.9 Tare function
6.10 Security code
6.11 Reset to factory defaults
6.12 Under and over-range
7. Lineariser
7.1 Lineariser calibration using an external
current source.
7.2 Lineariser calibration using internal
reference.
7.3 Lineariser error message
7.4 Under and over-range
7.5 Lineariser default configuration
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.
Appendix 2 ATEX dust certification
Appendix 3 IECEx gas and dust certification
Appendix 4 ETL and cETL certification
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
CONTENTS

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1. DESCRIPTION
These panel mounting, Ex nA certified non-
sparking 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.
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..
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.
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.
Fig 1 Indicator block diagram

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:
PWhile 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 4mAΦinput. When released the
normal display in engineering units will
return.
▲While this button is pushed the
indicator will display the numerical
value and analogue bargraph* the
indicator has been calibrated to display
with a 20mAΦinput. When released the
normal display in engineering units will
return.
ENo 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
ΦIf the indicator has been calibrated
using the CAL function, calibration
points may not be 4 and 20mA.
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.
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

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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.
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
In gases that may safely be used with
equipment having a temperature classification
of:
T1 450oC
T2 300oC
T3 200oC
T4 135oC
T5 100oC
At ambient temperatures between -40 and +70oC.
This allows use with all commonly used industrial
gases except carbon disulphide CS2.
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.
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

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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.
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.
Fig 2 Typical Zone 2 transmitter loop
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.
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 3 shows a typical application.

7
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.
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.
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.
Fig 4 Dimensions
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.
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.

9
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.
Fig 6 Rear terminals
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.
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 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 Pand Epush 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 Pbutton
will clear this prompt allowing each digit of the
code to be entered using the ▲and ▼push
buttons and the Pbutton to move control to the
next digit. When the correct four digit code has
been entered pressing Ewill 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.
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
Pbutton in display mode ‘C-P’ % %
Tare ‘tArE’ Off Off
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
'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 Ppush 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 Eto return
to the menu, or press the ▲or ▼button to change
the setting, followed by the Ebutton 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 Ebutton
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 Ebutton 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 Pwhich 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 Eto 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 Pwhich 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 Eto enter the new
span and return to the 'SPAn' prompt. Finally
press Eagain 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.
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.
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 Pagain 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 Pwill transfer
control to the next digit. When all the digits have
been adjusted, press Eto return to the 'ZEro'
prompt.
To adjust the display at 20mA, press the ▲button
which will cause the indicator to display 'SPAn',
pressing Pwill 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 Pwill transfer
control to the next digit. When all the digits have
been adjusted press Eto return to the 'SPAn'
prompt followed by Eto 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 Pagain will reveal the
existing bargraph justification which can be
changed to one of the following four or five options
using the ▲or ▼button:
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 Eto return to the
‘tYPE’ sub-function prompt.

14
The indicator’s digital display at which the
bargraph starts is defined by the ‘bArLo’ sub-
function which is selected by pressing the ▲
button followed by the Pbutton 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 Pwill transfer control to the next digit.
When all the digits have been adjusted, press Eto
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 Etwice 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 Ppush button: ‘C - - P’
When the indicator is in the display mode,
operating the Ppush 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 Ppush
button select 'C - -P' from the configuration menu
and press Pto 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
Eto 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 Ebutton for more than three seconds
will zero the indicator display and activate the tare
annunciator. Subsequent operation of the Epush
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 Pto reveal
the current setting. Pressing the ▲or ▼button
will toggle the setting between 'on' and 'oFF'.
When set as required press Eto 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 Pwhich 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 Pbutton will
transfer control to the next digit. When all the
digits have been adjusted press Eto 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 Pto 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.
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.
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.
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
Pwhich 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
Ppush button will introduce an additional break-
point 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 break-
points 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’ sub-
function each time the Pbutton 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, break-
points '0:1' and '1:1'.
When the required number of linearising break-
points 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 Pto 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 Pbutton to move between digits, enter the
required indicator display at this break-point.
When set as required, press the Epush 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.
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 Etwice will return the indicator to the
‘CAL’ function in the configuration menu.
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.
To add a break-point using the ▲or ▼button
select 'SEt' from the configuration menu and press
Pwhich 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
Ppush 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 break-
points 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 Pbutton 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, break-
points '0:1' and '1:1'.
When the required number of linearising break-
point 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 break-
point, 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 sub-
menu and press Pwhich will reveal the starting
point for the first segment '0:n', where n is the total
number of break-point entered. Press Pand use
the ▲and ▼buttons and the Pbutton 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 Pand 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’ sub-
function by pressing the Ebutton.
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 Pwhich will
reveal the starting point for the first break-point
'0:n', where n is the total number of break-points
entered. Press Pand use the ▲and ▼buttons
and the Pbutton to move between digits, to enter
the required indicator display at the first break-
point. When set as required, press Eto 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
Pand 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 Ebutton 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:
Indicator display
BA307NE BA327NE
First break-point '0:1' 4mA 0.0 0.00
Second break-point '1:1' 20mA 100.0 100.00

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
positive.
No display,
0V between
terminals 1 & 3.
Incorrect wiring
or no power
supply.
Check supply
voltage and
voltage drop
caused by all the
instruments in the
loop.
All decimal points
flashing.
Underrange if
–ve sign
displayed or
overrange.
Recalibrate the
indicator to reduce
the maximum
display.
Unstable display 4/20mA input is
noisy.
Reduce noise on
4/20mA input
and/or decrease
indicator
resolution.
Unable to enter
configuration
menu.
Incorrect
security code
entered.
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.
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.
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.

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
oC,
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.