BEKA BA504G User manual

Issue: 5
11th September 2018
BA504G, BA504G-SS
BA524G and BA524G-SS
general purpose
loop-powered
field mounting indicators
Issue 5

2
1. Description
2. Operation
2.1 Controls
3. Applications
3.1 Transmitter loops
3.2 Remote indication
4. Installation
4.1 Location
4.2 GRP models BA504G & BA524G
4.3 Stainless steel models BA504G-SS &
BA524G-SS.
4.4 Installation procedure
4.5 EMC
4.6 Units of measurement and tag marking
on scale card.
5. Configuration and Calibration
5.1 Summary of configuration functions
5.2 Indicator function: FunC
5.3 Resolution: rE5n
5.4 Position of the decimal point: dP
5.5 Calibration using an external current
source: CAL.
5.6 Calibration using internal
reference: 5et
5.7 Bargraph format and calibration: bAr
5.8 Function of the (push-button: C--P
5.9 Tare function: tArE
5.10 Security code: CodE
5.11 Reset to factory defaults: r5Et
5.12 Under and over-range
6. Lineariser
6.1 Lineariser calibration using an external
current source.
6.1.1 Example, Adding break-points
indicator.
6.2 Lineariser calibration using internal
reference.
6.2.1 Example, Adding break-points
to a new indicator.
6.3 Under and over-range
6.4 Lineariser default configuration
7. Maintenance
7.1 Fault finding during commissioning
7.2 Fault finding after commissioning
7.3 Servicing
7.4 Routine maintenance
7.5 Guarantee
7.6 Customer comments
8. Accessories
8.1 Units of measurement and instrument
identification.
8.2 Display backlight
8.2.1 Loop powering the backlight
8.2.2 Separately powering the
backlight.
8.3 Alarms
8.3.1 Solid state output
8.3.2 Configuration and adjustment
8.3.3 Alarm enable: EnbL
8.3.4 Setpoint adjustment:
5P1 and 5P2.
8.3.5 Alarm function: Hi .Lo
8.3.6 Alarm output status: no .nC
8.3.7 Hysteresis: H5tr
8.3.8 Alarm delay: dELA
8.3.9 Alarm silence time: 5iL
8.3.10 Flash display when alarm
occurs: FL5H.
8.3.11 Access setpoint in display
mode: AC5P.
8.3.12 Adjusting alarm setpoints from
the display mode.
8.3.13 Display setpoints on BA524G
or BA524G-SS bargraph.
8.4 Pipe mounting kits
8.5 Panel mounting kits
8.5.1 BA394G
8.5.2 BA494G
8.5.3 BA494G-SS
8.6 Back-box terminal assembly
CONTENTS
The BA504G, BA504G-SS, BA524G and BA524G-SS are CE marked to
show compliance with the European EMC Directive 2014/30/EU

3
1. DESCRIPTION
These field mounting, general purpose 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.
All the models are electrically similar, but have
different size displays and different enclosure
materials.
Model Display
BA504G 4 digits 34mm high
in GRP enclosure.
BA504G-SS 4 digits 34mm high
in stainless steel
enclosure.
BA524G 5 digits 29mm high with
31 segment bargraph
in GRP enclosure.
BA524G-SS 5 digits 29mm high with
31 segment bargraph.
in stainless steel
enclosure.
This instruction manual supplements the
instruction sheet supplied with each instrument.
The main application of all models is to display a
measured variable or control signal in a 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.
The BA504G, BA504G-SS, BA524G and the
BA524G-SS are not certified for use in explosive
atmospheres. For hazardous area applications the
BA304G, BA304G-SS, BA324G or the
BA324G-SS should be used.
2. OPERATION
Fig 1 shows a simplified block diagram of all
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 too low
to power the instrument the indicator will display
the error message LPLo.
Fig 1 Indicator block diagram

4
2.1 Controls
All models are controlled and calibrated via four
front panel push buttons. In the display mode i.e.
when the indicator is displaying a process variable,
these push buttons have the following functions:
(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 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.
)No function in the display mode
unless the tare function is being used.
(+ &Indicator displays firmware number
followed by version.
(+ *Provides direct access to the alarm
setpoints when the indicator is fitted
with optional alarms and the AC5P
access setpoints function has been
enabled.
(+ )Provides access to the configuration
menu via optional security code.
Note: * BA524G and BA524G-SS only
ΦIf the indicator has been
calibrated using the CAL
function, calibration points may
not be 4 and 20mA.
3. APPLICATIONS
3.1 Transmitter loops
All models may be connected in series with almost
any 4/20mA current loop and calibrated to display
the measured variable or control signal in
engineering units.
Fig 2 illustrates a typical application in which an
indicator is connected in series with a 2-wire
transmitter.
Fig 2 Indicator in transmitter loop
Considering the example shown in Fig 2, the sum
of the maximum voltage drops of all the
components in the loop must be less than the
minimum power supply voltage.
Minimum operating voltage of 2-wire Tx 10.0
Maximum voltage drop caused by controller 5.0
Maximum voltage drop caused by indicator 1.3
Maximum voltage caused by cables 0.4
_____
16.7V
Therefore in this example at 20mA the power
supply must have a minimum output of 16.7V
3.2 Remote indication
All models may be driven from any 4/20mA signal
to provide a remote indication. Fig 3 shows a
typical application in which the 4/20mA output from
a gas analyser is connected to a BA504G loop
powered indicator to provide a remote indication of
the analyser’s output. Again it is necessary to
ensure that the voltage capability of the 4/20mA
source is greater than the sum of the voltage drops
introduced by the indicator and the cable
resistance.

5
Fig 3 Indicator providing a remote display
4. INSTALLATION
4.1 Location
BA504G and BA524G indicators have a GRP
enclosure and BA504G-SS and BA524G-SS
indicators have a 316 stainless steel enclosure.
Both provide IP66 ingress protection after a 7J
impact and have a thick armoured window which
will withstand a 4J impact. They are suitable for
exterior mounting in most industrial and marine
environments.
The indicators should be positioned where the
display is not in continuous direct sunlight.
Field wiring terminals are located on the rear of the
indicator assembly as shown in Fig 5c. Indicator
terminals 2 and 4 are internally joined and may be
used for linking the return 4/20mA wire - see Fig 2.
The indicators are surface mounting, but may be
pipe mounted using one of the accessory kits
described in section 8.4 or panel mounted as
shown in section 8.5.
4.2 GRP models
BA504G and B524G
The GRP models are fitted with a bonding plate to
ensure electrical continuity between the two
conduit or cable entries. The bonding plate may be
mounted on the inside or outside of the enclosure
and includes an M4 earth stud. If the carbon
loaded GRP enclosure is not bolted to an earthed
post or structure, this earth stud should be
connected to the plant potential equalising
conductor.
An insulated M4 stud is provided in the bottom
right hand corner of the GRP back-box for
interconnecting cable screens.
If field wiring is to be terminated prior to the
installation of the indicator assembly, the GRP
models, BA504G and BA524G, can be supplied
with an optional back-box terminal assembly,
which includes a 4/20mA continuity diode. See
section 8.6 of this manual. This option is not
available for the stainless steel models.
4.3 Stainless steel models
BA504G-SS and BA524G-SS
The stainless steel models have an earthing
terminal in the lower left hand side of the back-box.
If the stainless steel enclosure is not bolted to an
earthed post or structure, this earth terminal should
be connected to the plant potential equalising
conductor.
An insulated M4 stud is provided in the bottom
right hand corner of the stainless steel back-box
for interconnecting cable screens.
4.4 Installation Procedure
Fig 4 illustrates the instrument installation
procedure for all models.
a. Remove the indicator assembly by
unscrewing the four captive 'A' screws.
b. Mount the enclosure back-box on a flat
surface and secure with screws or bolts
through the four 'B' holes. Alternatively use
one of the pipe or panel mounting kits
described in sections 8.4 and 8.5.
c. Remove the temporary hole plug and install
an appropriate IP rated cable gland or conduit
fitting. If two entries are required, the IP66
stopping plug should be replaced with an
appropriate IP and temperature rated cable
gland or conduit fitting.
d. Connect the field wiring to the terminals as
shown in Fig 5c. Replace the instrument
assembly on the back-box and evenly tighten
the four 'A' screws.
Fig 4 Indicator installation procedure

6
Fig 5a Dimensions for BA504G and BA524G.
Fig 5b Dimensions for
BA504G-SS and BA524G-SS.
Fig 5c Terminal connections for all models.
4.5 EMC
All the indicators comply with the requirements of
the European EMC Directive 2014/30/EU. For
specified immunity all wiring should be in screened
twisted pairs, with the screens earthed at one
point.
An insulated stud is included in the indicator back-
box for joining cable screens.
The optional back-box terminal assembly for GRP
indicators, which is described in section 8.6,
includes a pair of isolated linked terminals 5 and 6
for joining cable screens.

7
4.6 Units of measurement and tag marking
on scale card.
The indicator’s units of measurement and tag
information are shown on a scale card which slides
into the indicator.
New indicators are supplied with a printed scale
card showing the requested units of measurement
and tag information. If this information is not
supplied when the indicator is ordered, a blank
scale card will be fitted which can easily be marked
on-site with a dry transfer or a permanent marker.
Custom printed scale cards are available from
BEKA associates as an accessory.
To remove the scale card from an indicator
carefully pull the transparent tab at the rear of the
indicator assembly away from the indicator as
shown in Fig 6a.
Fig 6a Removing scale card
To replace the scale card carefully insert it into the
slot on the right hand side of the input terminals as
shown in Fig 6b. Force should be applied evenly
to both sides of the scale card to prevent if
twisting. The card should be inserted until about
2mm of the transparent tab remains protruding.
Fig 6b Inserting scale card into the
instrument assembly.

8
5. CONFIGURATION AND CALIBRATION
All the indicators are configured and calibrated via
four front panel push buttons. The configuration
functions are contained in an easy to use intuitive
menu that is shown diagrammatically in Fig 7.
Each menu function is summarised in section 5.1
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 8.3
Throughout this manual push buttons are shown
as (,),&or *, and legends displayed by
the indicator are shown in a seven segment font as
displayed by the indicator e.g. CAL and ALr2.
Access to the configuration menu is obtained by
operating the (and )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 (button
will clear this prompt allowing each digit of the
code to be entered using the &or *push button
and the (button to move control to the next digit.
When the correct four digit code has been entered,
pressing )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.
Once within the configuration menu the required
parameter can be reached by scrolling through the
menu using the &or *push button as shown in
Fig 7. When returning to the display mode
following recalibration or a change to any function,
the indicator will display dAtA followed by 5AVE
while the new information is stored in permanent
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
BA504G BA524G
BA504G-SS BA524G-SS
Access code CodE 0000 0000
Function FunC Linear Linear
Display at 4mA 2ero 0.0 0.00
Display at 20mA 5PAn 100.0 100.00
Resolution rE5n 1 digit 1 digit
Bargraph start BarLo ----- 0.00
Bargraph finish BarHi ----- 100.00
(button in display mode C--P %%
Tare tArE Off Off
5.1 Summary of configuration functions
This section summarises each of the main
configuration functions and includes a cross
reference to a more detailed description. Fig 7
illustrates the location of each function within the
configuration menu. The lineariser and the
optional factory fitted alarms are described
separately in sections 6 and 8.3 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:
5td Standard linear relationship
root Square root extraction
Lin 16 segment adjustable
lineariser – see section 6.
See section 5.2
rE5n Display resolution
Defines the resolution of the least
significant display digit. May be set to
1, 2, 5or 10 digits.
See section 5.3
dP Decimal point
Positions a dummy decimal point
between any of the digits or turns it off.
See section 5.4
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 5.5
5Et 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 5.6
bAr Bargraph format and calibration
Only the BA524G and the BA524G-SS
have 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 5.7

9
Display Summary of function
C--P Function of (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 (push button is
operated in the display mode.
See section 5.8
tArE Tare function
When enabled the tare function sets the
indicator display to zero when the )
push button is operated in the display
mode.
See section 5.9
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 5.10
r5Et Reset
Contains two sub-functions, ConF which
returns the indicator to the default
conditions shown in section 5.0 and LtAb
which returns the lineariser to the default
conditions shown in section 6.4. To
prevent accidental use both resets must
be confirmed by entering 5urE before
they will be executed.
See section 5.11

10

11
5.2 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:
5td 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 (.Ifthe
function is set as required, press )to return to
the menu, or press the &or *button to change
the setting, followed by the )button to return to
the configuration menu.
5td 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 6 of this instruction
manual.
5.3 Resolution: rE5n
This function defines the resolution of the least
significant display digit. Decreasing the display
resolution can improve the readability of a noisy
signal. Select rE5n from the menu and press
(which will reveal the current display resolution.
To change the resolution press the &or *
button to select 1,2,5or 10 digits, followed by the
)button to enter the selection and return to the
configuration menu.
5.4 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 (. 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 )button to enter the
selection and return to the configuration menu.
5.5 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 (. The indicator
will display 2Ero which is a request for a 4mA input
current. Adjust the external current calibrator to
4.000mA and again press (which will reveal the
current zero display. The flashing digit of the
indicator display can be changed by pressing the
&or *button, when set as required pressing
(will transfer control to the next digit. When all
the digits have been adjusted, press )to enter
the new zero and return to the 2Ero prompt .
Pressing the *button will cause the indicator to
display 5PAn which is a request for a 20mA input
current. Adjust the external current calibrator to
20.000mA and again press (which will reveal
the existing span display. The flashing digit of the
indicator display can be changed by pressing the
&or *button, when set as required pressing
(will transfer control to the next digit. When all
the digits have been adjusted press )to enter
the new span and return to the 5PAn prompt.
Finally press )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
(button.
b. Indicators may be calibrated at currents other
than 4 and 20mA, within 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.

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5.6 Calibration using internal reference: 5Et
Using the 5Et 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 5et 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 5Et from
the configuration menu and press (.The
indicator will display 2Ero, pressing (again will
reveal the current display at 4mA. The flashing
digit can be adjusted by pressing the &or *
button, when the flashing digit is correct pressing
(will transfer control to the next digit. When all
the digits have been adjusted, press )to return
to the 2Ero prompt.
To adjust the display at 20mA, press the *button
which will cause the indicator to display 5PAn,
pressing (will then reveal the indicator’s existing
display at 20mA. The flashing digit can be
adjusted by pressing the &or *button, when
the flashing digit is correct pressing (will transfer
control to the next digit. When all the digits have
been adjusted press )to return to the 5PAn
prompt followed by )to return to the 5Et prompt
in the configuration menu.
5.7 Bargraph format and calibration: bAr
Only the BA524G and BA524G-SS have a
bargraph.
In addition to a five digit numerical display the
BA524G 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 (. The indicator
will display tYPE, pressing (again 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
Alr5P Only with alarms - see section 8.3
oFF Bargraph disabled
When set as required press )to return to the
tYPE sub-function prompt.
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 (button which will reveal
the current indicator display at which the bargraph
starts. The flashing digit can be adjusted by
pressing the &or *button, when set as
required pressing (will transfer control to the
next digit. When all the digits have been adjusted,
press )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 )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.
5.8 Function of the (push button: C--P
When the indicator is in the display mode,
operating the (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 (push
button select C--P from the configuration menu
and press (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 )to return to the C--P prompt in the
configuration menu.
5.9 Tare function: tArE
The tare function is primarily intended for use with
a weighing system. When the indicator is in the
display mode and the tare function is activated,
pressing the )button for more than three
seconds will zero the indicator’s digital display and
activate the tare annunciator. On the BA524G the
bargraph remains linked to the digital display when
the tare function is activated. Subsequent
operation of the )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 (to
reveal the current setting. Pressing the &or *
button will toggle the setting between on and oFF.
When set as required press )to return to the
tARE prompt in the configuration menu.

13
5.10 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 (which will cause
the indicator to display the existing security code
with one digit flashing. The flashing digit can be
adjusted using the &or *push buttons, when
set as required operating the (button will
transfer control to the next digit. When all the
digits have been adjusted press )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.
5.11 Reset to factory defaults: r5Et
This function enables the indicator and the
lineariser to be quickly returned to the factory
default configurations shown in sections 5.0 and
6.4
To reset the indicator or lineariser select r5Et from
the configuration menu and press (, the indicator
will display one of the reset options ConF or LtAb.
ConF Resets the indicator to defaults
LtAb Resets the lineariser to defaults
Using the &or *push button select the
required sub-function and press (. To prevent
accidental resetting the request must be confirmed
by entering 5urE.Usingthe*button set the first
flashing digit to 5and press (to transfer control
to the second digit which should be set to u.
When 5urE has been entered pressing the )
button will reset the selected configuration menus
to the default settings and return the indicator to
the display mode.
5.12 Under and over-range
If the numerical display range of the indicator is
exceeded, all the decimal points will flash as
shown below:
BA504G BA524G
BA504G-SS BA524G-SS
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 BA524G and the
BA524G-SS bargraph is indicated by a flashing
arrow at the appropriate end of the bargraph.

14
6. LINEARISER
A sixteen segment, seventeen break-point (0 to 16)
lineariser may be selected in the FunC section of
the configuration menu. The position of each
break-point is fully adjustable so that the slope of
the straight line between break-points can be set to
compensate for input non-linearity, thus allowing
the indicator to display a 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 adjustment which produced the error
message will be ignored. Fig 8 shows a typical
linearised indicator characteristic.
Fig 8 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 7, but the CAL and 5Et functions are extended
as shown in Fig 9. As with a linear indicator,
calibration of the lineariser may be performed with
an external current source using the CAL function,
or with the internal reference using the 5Et
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 using the LtAb function
described in section 5.11.
6.1 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-points 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 Summary 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
(which will result in the Add sub-function prompt
being displayed. To enter the sub-function press
(which will reveal the current break-point and
the total number of break-points which have
already been entered. When adding a break-point
the insertion position can be selected using the &
and *push buttons followed by (push button
to insert the additional break-point. In previously
uncalibrated linearisers each new break-point
should be added in front of the highest existing
break-point, if this sequence is not followed a FaiL
message will occur in the Pt5 function. See
example in section 6.1.1.

15

16
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 (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-
points 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 ). The indicator will
display the Add or dEL prompt depending upon the
last function used. Using the Pt5 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 Pt5 function
in the sub-menu and press (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 (*.Usingthe&or *button and the
(button to move between digits, enter the
required indicator display at this break-point.
When set as required, press the )push button to
enter the required indicator display and return to
the sub-menu from which the next break-point can
be selected.
When all the break-points have been calibrated
pressing )twice will return the indicator to the
‘CAL’ function in the configuration menu.
Note: * The indicator input current must be
adjusted to the required value before the
(button is operated to enter the required
indicator display.
Error message
If during calibration the indicator displays
aFAiL error message the current at which
the selected break-point is being set is not
above the proceding break-point or is not
below the following break-point.
6.1.1 Example
Adding break-points to a new indicator.
When adding break-points to a new indicator, or to
a lineariser following resetting to the factory
defaults using the LtAb function described in
section 5.11, each additional break-point should be
added before the highest existing breakpoint.
The first additional break-point should be added
before the default break-point 1 :1 which will result
in a display of 1 : 2. If more new break-points are
required, using the *button select the new
highest break-point 2 : 2 and add the second
additional break-point by operating the (push
button which will result in a display of 2 : 3. Repeat
the sequence until the required number of break-
points has been entered.
The input current and at which each break-point
occurs and the corresponding indicator display
may now be entered as described above.
6.2 Lineariser calibration using the internal
reference.
The 5Et 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 5Et functions contains four sub-functions.
Display Summary 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.
di5P Defines indicator display at break-point.
Enables the indicator display at each
break-point to be defined.
The number of break-points 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-points being used as shown
below.

17
To add a break-point using the &or *button
select 5Et from the configuration menu and press
(which will result in the Add sub-function prompt
being displayed. To enter the sub-function press
(which will reveal the current break-point and
the total number of break-points which have
already been entered. When adding a break-point
the insertion position can be selected using the &
or *push button followed by (push button to
insert the additional break-point. In previously
uncalibrated linearisers each new break-point
should be added in front of the highest existing
break-point, if this sequence is not followed a FaiL
message will occur when the break-points are
calibrated. See example in section 6.2.1.
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 (button is pressed a break-point
is removed. When deleting a break-point from a
calibrated indicator, the break-point to be deleted
canbeselectedusingthe&or *push button.
The minimum number of break-points 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 ). 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 9, can now be entered using the in
and di5P sub-functions.
Using the &or *button select in from the sub-
menu and press (which will reveal the starting
point for the first segment 0 : n, where n is the total
number of break-points entered. Press (and use
the &or *button and the (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 )
to return to the 0 : n prompt from which the next
break-point can be selected using the &or *
button. When the required break-point has been
selected press (and enter the indicator input
current at which this break-point is required using
the &or *button and the (button to move
between digits. 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 )button.
The corresponding indicator display at each of the
break-points can now be defined using the di5P
sub-function. Using the &or *button select the
di5P sub-function and press (which will reveal
the starting point for the first break-point 0:n, where
nis the total number of break-points entered.
Press (and use the &or *button and the (
button to move between digits, to enter the
required indicator display at the first break-point.
When set as required, press )to return to the 0:n
prompt from which the next break-point can be
selected using the &or *button. When the
required break-point has been selected press
(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 5Et function in the configuration menu
by pressing the )button twice.
Error message
If during calibration the indicator displays
aFAiL error message the current at which
the selected break-point is being set is not
above the proceding break-point or is not
below the following break-point.
6.2.1 Example
Adding break-points to a new indicator.
When adding break-points to a new indicator, or to
a lineariser following resetting to the factory
defaults using the LtAb function described in
section 5.11, each additional break-point should be
added before the highest existing breakpoint.
The first additional break-point should be added
before the default break-point 1:1 which will result
in a display of 1:2. If more new break-points are
required, using the *button select the new
highest break-point 2:2and add the second
additional break-point by operating the (push
button which will result in a display of 2:3. Repeat
the sequence until the required number of break-
points has been entered.
6.3 Under and over-range
The lineariser does not change the under and
over-range indication described in section 5.12. 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.
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.
6.4 Lineariser default configuration
When the lineariser is reset to the factory defaults
using the LtAb function described in section 5.11,
the default conditions are:
Indicator display
BA504G BA524G
BA504G-SS BA524G-SS
First break-point 0 :1 4mA 0.0 0.00
Second break-point 1 :1 20mA 100.0 100.00

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7. MAINTENANCE
7.1 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 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.
Overrange or
underrange if
-ve sign is
displayed.
Recalibrate the
numerical display.
Unstable display 4/20mA input
is noisy.
Eliminate ripple on
4/20mA power
supply 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.
7.2 Fault finding after commissioning
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
If an indicator fails after it has been functioning
correctly, follow the procedure shown in section
7.1. If this does not reveal the cause of the fault, it
is recommended that the instrument is replaced.
This can be done without disconnecting power, but
while the indicator is disconnected the 4/20mA
loop will be open circuit.
7.3 Servicing
All BA504G, BA504G-SS, BA524G and
BA524G-SS 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.
7.4 Routine maintenance
The mechanical condition of the instrument and
electrical calibration should be regularly checked.
The interval between inspections depends upon
environmental conditions.
7.5 Guarantee
Indicators which fail within the guarantee period
should be returned to BEKA associates or our local
agent. It is helpful if a brief description of the fault
symptoms is provided.
7.6 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.

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8. ACCESSORIES
8.1 Units of measurement & instrument
identification.
New indicators are supplied with a printed scale
card showing the units of measurement and tag
information specified when the instrument was
ordered. If this information was not supplied a
blank scale card will be supplied which can easily
be marked with a dry transfer or a permanent
marker.
Custom printed scale cards are available as
accessories and may be easily fitted as shown in
section 4.6 of this manual.
All models can also be supplied with a blank or
custom laser engraved stainless steel legend plate
- see Fig 5a and 5b . The plate, which after
installation is visable from the front of the
instrument, is supplied loose with two fixing screws
for securing it to the rear of the instrument's back-
box. This plate can typically accommodate:
1 row of 5 alphanumeric characters 10mm high
or 1 row of 6 alphanumeric characters 7mm high
or 2 rows of 10 alphanumeric characters 5mm high
8.2 Display backlight
All models 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 10 Terminals for optional backlight
8.2.1 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 11, which increases the maximum indicator
voltage drop from 1.2 to 5V.
Fig 11 Backlight loop powered
Providing the increased voltage drop can be
tolerated the system design described in section 3
of this manual remain valid with the backlight loop
powered.
8.2.2 Separately powering the backlight
The optional backlight may also be powered from a
separate power supply as shown in Fig 12.
Fig 12 Backlight separately powered
When separately powered the backlight draws a
constant current providing the supply is equal to or
greater than the minimum specified voltage.
Below this supply voltage the backlight continues
to function but with reduced brilliance.
Current Minimum voltage
All models 34.7mA 11V

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8.3 Alarms
CAUTION
These alarm outputs should not be used
for critical safety applications such as an
emergency shut down system.
All models can be supplied with factory fitted dual
solid state, single pole alarm outputs. Each alarm
output may be independently configured 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 13 illustrates the
conditions available and shows which are fail safe.
When an alarm occurs an alarm annunciator on
the indicator 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 13 Alarm outputs
Configurable functions for each alarm include
adjustable setpoint, hysteresis, alarm delay and
alarm accept.
8.3.1 Solid state output
Each alarm has a galvanically isolated single pole
solid state switch output as shown in Fig 14. The
output is polarised and current will only flow in one
direction.
Ron = less than 5Ω+ 0.7V
Roff = greater than 1MΩ
Fig 14 Equivalent circuit of each alarm output
The solid state output of each alarm may be used
to switch any dc circuit with parameters equal to or
less than:
Vmax = 40V
Imax = 200mA