BEKA BA354ND User manual

Issue: 3
11th November 2009
BA354ND
Type n certified
4/20mA loop-powered
field mounting
rate totaliser
issue 3

2
1. Description
2. Operation
2.1 Controls
2.2 Displays
3. Type ‘n’ certification
3.1 Certificate of Conformity
3.2 ATEX
3.3 Input terminals
3.4 Reset terminals
3.5 Zones, gas groups and T rating
3.6 Certification label information
4. System Design for Zone 2
4.1 Flow transmitter loops
4.2 Remote indication
4.3 Resetting the total display to zero
5. Installation
5.1 Location
5.2 Installation procedure
5.3 EMC
6. Programming and Calibration
6.1 Calibration structure
6.2 Accessing programme functions
6.3 Summary of programmable functions
6.4 Root extractor
6.5 Resolution
6.6 Position of the decimal points
6.7 Calibration of rate display using an
external current source.
6.8 Calibration of rate display using
internal references.
6.9 Conditioning sub-menu
6.9.1 AC rejection
6.9.2 Calibration of internal
references.
6.10 Resetting grand total
6.11 Timebase
6.12 Function of the Ppush-button
6.13 Total scale factor
6.14 Percentage clip-off
6.15 Local reset of total display
6.16 Security code
6.17 Over and under-range
7. Calibration Examples
7.1 Using an external current source
7.2 Using the internal references
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 Units of measurement and
instrument identification.
9.2 Alarms
9.2.1 Solid state output
9.2.2 Type n certification
9.2.3 Programming and adjustment
9.2.4 Alarm enable
9.2.5 Type of alarm
9.2.6 Setpoint adjustment
9.2.7 Alarm function
9.2.8 Alarm output status
9.2.9 Hysteresis
9.2.10 Alarm delay
9.2.11 Alarm silence time
9.2.12 Access setpoint
9.2.13 Adjusting alarm setpoints from
display mode.
9.3 Display backlight
9.4 External push-buttons
9.5 Pipe mounting kits
9.6 Stem mounting kit
10. Index
CONTENTS
The BA354ND is CE marked to show compliance with the
European Explosive Atmospheres Directive 94/9/0
and the European EMC Directive 2004/108/EC

3
1. DESCRIPTION
The BA354ND is an Ex nL certified 4/20mA loop-
powered rate totaliser primarily intended for use
with flowmeters. The instrument simultaneously
displays the rate of flow represent by the 4/20mA
input current and the total flow in engineering units
on two separate displays. The BA354ND only
introduces a 1.1V drop which allows it to be
installed into almost any 4/20mA flow loop. No
additional power supply or battery is required.
The BA354ND has been issued with a Certificate
of Conformity to EN50021:1999, Type of protection
’n’ by ITS Testing and Certification Ltd.
The BA354ND complies with the European ATEX
Directive 94/9/EC for Group II, Category 3G
equipment.
Housed in a robust IP66 glass reinforced polyester
(GRP) enclosure with an armoured glass window,
the BA354ND is surface mounting, or may be pipe
mounted using one of the accessory kits. A stem
mounting kit is also available allowing direct
mounting onto a flowmeter conduit entry.
2. OPERATION
Fig 1 shows a simplified block diagram of a
BA354ND. 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. After a short
delay the following display sequence occurs:
All segments of the display are activated
For about 3 seconds.
Decimal points on large display are
sequentially activated for about 3
seconds.
Rate display and totaliser start to function
using calibration information stored in the
instrument's permanent memory.
If the 4/20mA current is disconnected during
operation the latest total and grand total are stored
in permanent memory.
Fig 1 Simplified block diagram of BA354ND
2.1 Controls
The BA354ND is controlled and calibrated via four
push-button switches which are located behind the
instrument control cover, or as an option on the
outside of the instrument cover. In the operating
mode i.e. when the instrument is displaying rate
and total flow the switch functions are:
Summary of Switch Functions
PDisplays input current in mA or as a
percentage of span.
Down Shows rate display calibration at 4mA
input
Up Shows rate display calibration at
20mA input
E+Down Grand total –
displays least significant 8 digits
E+Up Grand total –
displays most significant 8 digits.
Down Resets total display
+Up programmable function
Note: When optional alarms are fitted the push-
buttons may be programmed to have alternative
functions – see section 9.2

4
Full Description of Switch Functions
PWhile this button is pushed the rate
display will show the input current in mA,
or as a percentage of the instrument
span depending upon how the instrument
has been programmed. When the button
is released the normal display in
engineering units will return. The function
of this push-button may be modified
when alarms are fitted to the instrument.
Down While this button is pushed the
instrument will show the calibrated rate
display with 4mA input - usually zero for
flow applications. When the button is
released the flow rate will again be
displayed.
Up While this button is pushed the
instrument will show the calibrated rate
display with 20mA input. When the
button is released the flow rate will again
be displayed.
EWhile these buttons are pushed the
+Down total display will show the least significant
eight digits of the grand total, and the
grand total annunciator will be activated.
E+Up While these two buttons are pushed the
total display will show the most significant
eight digits of the grand total and the
grand total annunciator will be activated.
Down Resets the tota l display to zero
+Up when these two push-buttons are
operated simultaneously.
Selectable function from programme
menu.
See section 6.15
2.2 Displays
The BA354ND has two digital displays and
associated annunciators, plus a flow indicator as
shown on page 1.
Rate Shows the flow rate on the smaller
Display five digit display.
Total Shows the total flow since the
display instrument was last reset on the larger
eight digit display.
Flow This disc in the lower left hand corner
indicator of the display 'rotates' when the input
current exceeds 4mA.
3. TYPE ‘n’ CERTIFICATION
3.1 Certificate of Conformity
ITS Testing and Certification Ltd. (Formerly ERA
Technology Ltd) have issued a Certificate of
Conformity Ex00Y4017 confirming that the
BA354ND complies with the CENELEC standard.
3.2 ATEX certification
The BA354ND complies with the European ATEX
Directive 94/9/EC for Group II, Category 3G
equipment. It has been assessed using the
‘Internal Control of Production procedure specified
in Annex 8 of the Directive. A technical dossier
has been prepared and an EC Declaration of
Conformity BEKA01ATEX0011 has been issued.
The instrument bears the Community Mark and,
subject to local codes of practice, may be installed
in any of the EU member countries, i.e. Austria,
Belgium, Denmark, Finland, France, Germany,
Greece Ireland, Italy, Luxembourg, The
Netherlands, Portugal, Spain, Sweden and the
United Kingdom. ATEX certificates are also
accepted in Norway, Iceland, Liechtenstein and in
Switzerland.
This manual describes installations that comply
with BS EN60079: Part 14 Electrical Installation in
Hazardous Areas. When designing systems for
installation outside the UK, the local Code of
Practice should be consulted.
3.3 Input terminals
Input terminals 1 and 3 may be safely connected in
series with any 4/20mA loop providing that in
normal operation the input current to the
instrument does not exceed 30mA dc.
3.4 Reset terminals
The BA354ND total display may be reset to zero
by connecting a switch between reset terminals
RS1 and RS2. The switch may be located in Zone
2 or in the safe area. The only certification
requirements are that the switch and associated
wiring be able to withstand a 500V rms insulation
test to earth.

5
Alternatively, the BA354ND may be programmed
so that the total display is reset to zero when the
Up and Down push-buttons are operated
simultaneously.
3.5 Zones, gas groups and T rating
The BA354ND has been certified as Group II,
Category 3G apparatus as defined in the ATEX
Directive and as Ex nL T5, Tamb –20 to 60oC.
‘L’ indicates that the BA354ND uses energy-
limiting techniques to achieve compliance as
defined in EN 60079-15. This technique is based
on the philosphy of intrinsic safety which limits the
current and voltage applied to components which
may generate a spark in normal operation. e.g.
switches and potentiometers.
These approvals confirm that the BA354ND is safe
in normal operation and may be installed in:
Zone 2 hazardous area
Be used with gases in groups:
Group A propane
Group B ethylene
Group C hydrogen
Having a temperature classification of:
T1 450°C
T2 300°C
T3 200°C
T4 135°C
or T5 100°C
At an ambient temperatures between –20 and
+60oC
This allows the BA354ND to be installed in Zone 2
hazardous areas (low risk) and to be used with
most common industrial gases.
3.6 Certification Label Information
The ATEX certification label is fitted in a recess on
the top outer surface of the enclosure. The year
of manufacture and instrument serial number are
shown on a separate label within the terminal
compartment.
4. SYSTEM DESIGN FOR ZONE 2
4.1 Flow transmitter loops
A BA354ND rate totaliser may be connected in
series with almost any 4/20mA flow loop and
calibrated to display the rate of flow and total flow
in engineering units. Fig 2 illustrates a typical flow
loop application.
There are two basic design requirements:
1. In normal operation the voltage, current and
power applied to terminals 1 and 3 of the
BA354ND must not exceed:
Ui 4V dc
Ii 30mA dc
Providing the maximum input current in
normal operation is less than 30mA, the
maximum input voltage will be automatically
limited to less than 4V by the safety
components within the BA354ND.
2. The 4/20mA loop must be able to tolerate the
additional 1.1V required to operate the
BA354ND.
In practice it is only necessary to ensure that that
in normal operation the maximum current flowing
in the loop is less than 30mA. In the example
shown in Fig 2, the maximum current is
determined by the maximum output from the
flowmeter.
Fig 2 BA354ND in a flow loop

6
Considering the example shown in Fig 2, the sum
of the maximum voltage drop introduced by each
component in the loop must be less than the
minimum power supply voltage.
Min operating voltage of 2-wire flowmeter 10.0
Maximum voltage drop caused by controller 5.0
Maximum voltage drop caused by BA354ND 1.1
Maximum voltage drop caused by cables 0.4
_____
16.5V
At 20mA the power supply must therefore have an
output greater than 16.5V
4.2 Remote indication
The BA354ND rate totaliser may be driven from
any 4/20mA signal to provide a remote indication
of rate and total flow in a Zone 2 hazardous area.
Fig 3A shows a typical application in which the
4/20mA output from a powered flowmeter drives a
BA354ND. Again it is necessary to ensure that the
4/20mA loop complies with the two design
requirements listed in section 4.1 If suitably
certified, the flowmeter may also be located in
Zone 2 as shown in Fig 3B.
Both examples show an external reset switch.
Alternatively the BA354ND may be programmed
so that the total display can be reset from the
internal push-buttons – see section 4.3.
Fig 3A Remote indication from flowmeter in
safe area
Fig 3B Remote indication from flowmeter in
Zone 2
4.3 Resetting the total display to zero
The BA354ND may be programmed to reset the
total display to zero when the Up and Down
buttons are pushed simultaneously for 2 seconds.
If the application requires the total display to be
reset via a key-switch or from a remote location,
this can be achieved by connecting an external
switch to terminals RS1 and RS2. This switch may
be located in Zone 2 or in the safe area providing it
and the associated wiring can withstand a 500V
rms insulation test, to frame or earth. Most
industrial push-buttons and key-switches comply
with this requirement.

7
5. INSTALLATION
5.1 Location
The BA354ND rate totaliser is housed in a robust
IP66 glass reinforced polyester (GRP) enclosure
incorporating an armoured glass window and
stainless steel fittings. It is suitable for exterior
mounting in most industrial environments,
including off-shore and waste water treatment.
Please consult BEKA associates if high vibration is
anticipated.
The BA354ND enclosure is surface mounting.
Accessory kits described in sections 9.5 & 9.6 of
this manual enable the instrument to be mounted
onto a vertical or horizontal pipe, or directly onto a
flowmeter conduit entry.
The field terminals and the two mounting holes are
located in a separate compartment with a sealed
cover allowing the instrument to be installed
without exposing the display assembly.
Terminals 2 and 4 are internally joined and may be
used for linking the return 4/20mA wire - see Fig 2.
Similarly terminals 5 and 6 are internally joined and
may be used for linking the cable screens. The
BA354ND earth terminal is connected to the
internal EMC filters. For maximum radio frequency
interference rejection this terminal should be
connected to a cable screen which is earthed in
the safe area. To prevent circulating currents,
cable screens should only be earthed at one point
in the safe area.
The BA354ND enclosure is supplied with a
bonding plate to ensure electrical continuity
between the three conduit / cable entries.
5.2 Installation Procedure
Fig 4 illustrates the instrument installation
procedure.
a. Remove the instrument terminal cover by
unscrewing the two captive 'A' screws.
b. Mount the instrument on a flat surface and
secure with two M6 screws through the 'B'
holes. Alternatively use one of the mounting
kits described in section 9.5
c. Remove the temporary dust seals from the
three cable entries and install the required
glands, conduit fittings or blanking plugs. To
comply with the BA354ND ATEX certification
requirements these fittings must be Ex n or
Ex e approved.
Note: The temporary dust seals do not
provide IP66 protection.
d. Connect the field wiring to the terminals as
shown in Fig 5.
e. Replace the instrument terminal cover and
evenly tighten the two 'A' screws.
Fig 4 BA354ND installation procedure
5.3 EMC
The BA354ND complies with the requirements of
the European EMC Directive 2004/108/EEC. For
specified immunity all wiring should be in
screened twisted pairs, with the screens earthed
in the safe area.
Additional immunity may be obtained by
connecting the BA354ND earth terminal to a
cable screen which is earthed in the safe area.

8
Fig 5 Dimensions and terminal connections

9
6. PROGRAMMING & CALIBRATION
The BA354ND is programmed and calibrated via
four push-buttons which are located behind the
instrument control cover. If frequent access to
the push-buttons is required, the rate totaliser can
be supplied with duplicate membrane push-buttons
mounted on the outside of the control cover.
All the programming functions are contained in an
easy to use menu which is shown diagramatically
in Figs 7A and 7B. Each function is summarised
in section 6.3 which includes references to more
detailed information. Although this simple menu
driven system enables most adjustments to be
made without repeated reference to this manual, it
is recommended that at least the summary of the
programmable functions in section 6.3 is read
before attempting programming or recalibration.
When the instrument is fitted with alarms, the basic
menu is expanded to include the alarm functions
which are described in section 9.2 of this manual.
Note: While the instrument is being programmed
or calibrated totalisation is suspended, any flow
occurring during this time will not be recorded,
6.1 Calibration structure
Fig 6 shows the BA354ND calibration structure.
The 4/20mA input current, which in flow
applications represents flow rate, is displayed on
the five digit display. Using the instrument’s 'CAL'
or 'SEt' functions this display may be calibrated to
show the flow rate in engineering units. Both the
zero (display at 4mA) and the span (display at
20mA) are adjustable, although for flow application
the display at 4mA is usually zero.
The position of the decimal point in the rate display
is defined by the d.p. function. To simplify
calibration the BA354ND uses floating point
arithmetic. Moving the position of the decimal point
in the rate display will therefore affect totalisation.
Fig 6 Calibration structure
The BA354ND total display is calculated from the
rate display using two serial factors: the timebase
't-bASE' and the total scaling factor 'SCALE-t'.
The timebase divides the rate display according to
whether the rate display represents flow per
second, per minute or per hour. The total scaling
factor 'SCALE-t' is a wide range programmable
dividing factor allowing the rate and total displays
to be in different units.
For example, if a BA354ND is displaying rate in
litres per minute, setting 'SCALE-t' to 4.5461
produces a total display in UK gallons.
Alternatively, setting 'SCALE-t' to 4546.1 will
produce a total display in thousands of UK gallons.
The total is calculated and the display updated
once every second, which defines the resolution of
the total flow display. When total alarms are used
for batching applications, this resolution may
define the system accuracy.

10
CLr.YES
t-bASE C--P
4-20 00000 00 OFF
LOC-rSET
0000
COdE
When fitted alarms
appear here
Clear
grand total
or
to select CLr-YES
confirmed by
entering
WARNING
Cleared grand
total can not
be recovered
Timebase
or
between
4-20mA and
to toggle
or
Function of
P button
% of span to next digit.
Total scale
to adjust value
Press or
and to move
factor
Press +
to position
decimal point
% clip-off
to adjust value
Press or
between
0 and 10% or
and
pressing
Define Security
Enter by
Code
to move to
next digit
Local reset
or
Fig 7B. Programme Structure
CLr.Gtot
EEEEEEE
EPPEPE
PE PE PEPE
PP
To Cond
function on
Fig 7A
SurE
P E
SurE using
or
to adjust
display and
to move
to next digit
P
CLIP-OFF
SCALE-t
tb-1
to define rate
display timebase
select
tb-1 for flow/sec
tb-60 for flow/min
tb-3600 for flow/hour
to turn the local
reset function
On or OFF.
When On total
display is reset to
zero when
and
are operated
simultaneously

11
Display
1, 2, 5 or 10 digit
rate display
resolution P
P
P
P
E
P
E
P
E
E
E
P
PP
E
E EE
P
E
P
E
P
E
P
E
P
E
P
E
P
E
PEEE
P P
EEEEEEE
E
P
E
function on
Fig 7B
To GLr.tot
Fig 7A. Programme Structure
THESE REFERENCES
BEFORE ATTEMPTING TO ADJUST
READ INSTRUCTION MANUAL
WARNING
Calibration of internal references
internal references
Without need for accurate input
current set required display at
Calibration of rate display using
to move to next digit
4mA by pressing or and
Similarly set the required
full scale display
accurate 20mA input current
scale display using an
Similarly set the required full
to move to next digit
pressing or and
set required zero display by
With accurate 4mA input current
external current source
Calibration of rate display using
displays
toggle between
and to
decimal point
position of
to select
or
Decimal point
or
to select
Resolution
On and OFF
between
to toggle
or
extraction
Square root
mode
Display
Ent
.020A
Ent
.004A50
Cond
SurE
FrE rEF
SPAn
19999
SEt
ZErO
19999
SPAn
1999919999
ZErO
CAL
00000
d.P.
00000000
rESn
10
access
allows direct
Code 0000
next digit
to move to
and
pressing
Enter code by
Security Code
On
root
XXXX
COdE

12
6.2 Accessing programming functions
Throughout this manual push-buttons are shown in
italics e.g. P or Up push-button, and legends
displayed by the instrument are shown within
inverted commas e.g. 'CAL' and ' ALr2'.
Access to the programme menu is obtained by
operating the Pand Epush-buttons
simultaneously. If the instrument is not protected
by a security code the first parameter 'root' will be
displayed. If a security code other than the default
code 0000 has already been entered, the
instrument will display 'COdE'. Press Pto clear
this prompt and enter the security code for the
instrument using the Up or Down push-button to
adjust each digit, and the P push-button to move
control to the next digit. If the correct code has
been entered pressing Ewill cause the first
parameter 'root' to be displayed. If an incorrect
code is entered, or a push-button is not operated,
the instrument will timeout after ten seconds and
automatically return to the display mode.
Apart from defining the position of the decimal
point in the rate display all programme functions
and prompts are shown on the large eight digit
display.
Once within the main programme menu the
required parameter can be reached by scrolling
through the menu using the Up and Down push-
buttons as shown by the programme structure in
Figs 7A and 7B. When returning to the operating
mode following recalibration or changes to any
parameters, the total display will show circulating
decimal points for a few seconds while the new
information is stored in permanent memory.
All new BA354ND rate totalisers are supplied
calibrated as requested at the time of ordering. If
calibration information is not supplied, the
BA354ND will be set to display a rate of 0.00 with
4mA input and 100.00 with 20mA input. The total
scale factor will be set to 1.0000 with a timebase of
flow per second. The instrument can easily be
recalibrated on-site.
6.3 Summary of programmable functions
This section summarises all the programmable
functions and when read with Figs 7A and 7B
provides sufficient information to condition and
calibrate the instrument. A cross-reference to
more detailed information is given for each
function.
SUMMARY
Display Description of function
'root' Square root extractor
Enables the square root extractor to be
turned on or off. When the root
extractor is turned on, clip-off is
automatically set to 5% of maximum
flow.
See section 6.4
'rESn' Display resolution
Selects the resolution of the least
significant digit of the rate display. May
be set to 1, 2, 5 or 10 digits.
See section 6.5
'd.P.' Decimal points
Defines the position of the decimal
point in both the rate and total displays.
See section 6.6
'CAL' Calibration of rate display using
external current source.
Enables the zero and span of the rate
display to be adjusted using an external
current source such as a calibrator.
Also enables a complete loop to be
calibrated from primary element to the
indicator display.
When used with an accurate traceable
current source this is the preferred
method of calibration.
See section 6.7
'SEt' Calibration of rate display using
internal references.
Enables the zero and span of the rate
display to be adjusted without the need
for an accurate input current or
disconnection from the 4/20mA loop.
See section 6.8

13
Display Description of function
'Cond' Indicator conditioning
This is a protected sub-menu which
contains the calibration routine for the
two internal references 'rEF', and the
mains (line) frequency filtering
function 'FrE'.
See section 6.9
CAUTION
Please read sections 6.9 and
6.9.1 of this manual before
changing any of the
parameters in this sub-menu.
Incorrect adjustment may
result in reading errors.
'CLr. Gtot' Clear grand total
This function resets the grand total to
zero when 'CLr YES' is selected, and
'SurE' is entered to confirm the
instruction.
Note: Once cleared, a grand total can
not be recovered.
See section 6.10
't-bASE' Timebase
Three selectable divisors which
define whether the rate display
represents flow per second, per
minute or per hour.
See section 6.11 & Fig 6.
‘C - - P' Function of P push-button in
display mode
The instrument may be programmed
to show on the rate display the input
current in milliamps, or the input as a
percentage when the Ppush-button
is operated in the display mode.
Select ‘PC’ for % of span and 4-20 to
display current.
See section 6.12
Display Description of function
'SCALE-T' Total Scale Factor
Defines the arithmetic relationship
between the rate and total displays.
May be adjusted between 0.0001 and
65535
SCALE-t = Units of rate display
Units of total display
To calculate SCALE-t the required
units of measurement for the total
display must be converted to the units
of measurement used for the rate
display.
See section 6.13, 7 and Fig 6.
'CLIP-OFF' Percentage Clip off
To prevent totalisation at very low
flow rates, this function enables the
user to select a percentage rate
below which the rate display is
forced to zero. Adjustable between
0 and 10% of flow for linear inputs,
and 5 to 10% when the root function
is used to linearise a square law
input.
See section 6.14
'LOC.rSEt' Local reset of total display
When turned 'On' this function
enables the total display to be reset
to zero by simultaneously operating
the Up and Down push-buttons.
See section 6.15
'COdE' Security code
Defines a four digit numeric code
which must be entered to gain
access to programmable functions.
Default code 0000 disables the
security function and allows
unrestricted access to all
programmable functions.
See section 6.16

14
6.4 Root extractor: root
This function is primarily intended for use with
differential flowmeters which have a square law
4/20mA output. The root extractor linearises the
flow signal enabling the BA354ND to display rate
and total flow in linear engineering units.
To activate the square root extractor select 'root'
from the menu and press P which will reveal if the
function is 'On' or 'OFF'. If the function is set as
required, press Eto return to the menu, or press
the Up or Down button to change the setting,
followed by the E button to return to the main
menu.
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
6.5 Resolution: rESn
This function defines the resolution of the least
significant rate display digit. Decreasing the
display resolution can improve the readability of a
noisy signal. Select 'rESn' from the menu and
press Pwhich will reveal the current display
resolution. To change the resolution press the Up
or Down button to select 1, 2, 5 or 10 digits,
followed by the Ebutton to return to the menu.
6.6 Position of the decimal points: d.P.
This function positions the decimal point in both
the rate and total displays.
The rate display can have up to five digits and the
decimal point may be positioned between any of
them, or omitted. The BA354ND uses floating
point arithmetic so moving the position of the rate
display decimal point will affect totalisation.
Similarly the total display has eight digits and the
decimal point may be positioned between any of
them, or may be omitted.
To adjust the position of either decimal points
select 'd.P.' from the main menu and press P which
will activate both displays with one digit and the
following decimal point of the total display flashing.
If only the least significant digit is flashing, this
indicates that the decimal point is omitted.
The position of the decimal point can be moved by
pressing the Up or Down push-button. Operating
the P push-button will toggle control between the
two displays. When both decimal points have
been correctly positioned press Eto return to the
main menu.
If the application requires flow rate to be the
primary display i.e. shown on the large display,
the d.P. function enables the rate and total
displays to be interchanged. The rate display will
continue to have five digits but the total display will
be reduced from eight to six digits. The rate and
total annunciators will also be interchanged.
Pressing the Up and Down buttons simultaneously
will interchange the displays.
6.7 Calibration of rate display using an
external current source: CAL
This function enables the zero and span of the rate
display to be adjusted using an external calibrated
current source. When used with an accurate
traceable current source this is the preferred
method of calibration.
To calibrate the instrument select 'CAL' from the
main menu and press P. The indicator will display
'ZErO' which is a request for a 4mA input current.
Adjust the external current calibrator to 4.000mA
and again press P which will reveal the current
instrument zero display. For flow applications this
will usually be zero. Each digit of the rate display
can be changed by pressing the Up or Down
buttons. When the first digit is correct pressing P
will transfer control to the next digit. The most
significant digit, which can be 1 or 2 is set by
rolling over the previous digit. When all the digits
have been adjusted, press Eto enter the new zero.
The indicator will display 'Ent' for a few seconds
while the information is being stored in memory,
and will then return to the 'ZErO' prompt .
To adjust the rate display at 20mA, press the Up
button which will cause the instrument to display
'SPAn'. Adjust the external current calibrator to
20.000mA and again press P which will reveal the
existing full scale display. Each digit of the rate
display can be changed by pressing the Up or
Down buttons. When the first digit is correct
pressing Pwill transfer control to the next digit.
The most significant digit, which can be 1 or 2 is
set by rolling over the previous digit. When all the
digits have been adjusted press E to enter the new
span. The instrument will display 'Ent' for a few
seconds while the information is being stored in
memory and will then return to the 'SPAn' prompt.
Finally press Eagain to return to the main menu.
This function may also be used when calibrating a
complete loop from flow to instrument display.

15
6.8 Calibration of rate display using internal
references: SEt
This function enables the zero and span of the rate
display to be adjusted without the need for an
accurate external current source, or for
disconnection from the 4/20mA loop.
The accuracy of this method depends upon the
accuracy of the internal references which should
be regularly calibrated as described in section
6.9.2
To calibrate the rate display select 'SEt' from the
main menu and press P. The instrument will
display 'ZErO', pressing Pagain will reveal the
current display at 4mA. For flow applications this
will usually be zero. Each digit of the rate display
can be changed by pressing the Up or Down
buttons. When the first digit is correct pressing P
will transfer control to the next digit. When the
least significant digit has been adjusted, press Eto
return to the 'ZErO' prompt which completes the
adjustment.
To adjust the display at 20mA, press the Up button
which will cause the instrument to display 'SPAn'.
Pressing P again will reveal the indicator display.
Each digit can be changed by pressing the Up or
Down buttons. When the first digit is correct,
pressing Pwill transfer control to the next digit.
The most significant digit, which can be 1 or 2, is
set by rolling-over the previous digit. When all the
digits have been adjusted press E to return to the
'SPAn' prompt, followed by Eto return to the main
menu.
6.9 Conditioning sub-menu: Cond
This sub-menu allows the mains (line) frequency at
which the instrument has maximum ac rejection to
be selected and the two internal references to be
calibrated. These functions are contained in a
protected sub-menu to minimise the possibility of
accidental adjustment. To gain access to the sub-
menu select 'Cond' from the main menu and press
P which will cause the instrument to display '0000'.
Using the Up, and Down buttons and the P button
to move to the next digit enter the password 'SurE'.
Pressing E will then give access to the sub-menu.
Note 'S' is entered as '5'.
6.9.1 AC rejection: FrE
WARNING
If the mains filter frequency is
changed, the rate display and the
internal references (if used) must be
recalibrated.
To provide maximum low frequency rejection the
internal digital filter may be set to operate at 50 or
60Hz to correspond with the local mains (line)
frequency. To change the frequency select 'FrE'
from the 'Cond' sub-menu and press Pwhich will
reveal the current setting. The setting can be
changed by pressing the Up or Down buttons
followed by the Ebutton to return to the sub-menu.
6.9.2 Calibration of internal references: rEF
The BA354ND contains two references
representing 4 and 20mA. These are used in the
'SEt' function which enables the rate display to be
calibrated without an external current calibrator.
They are also used in the 'C--P' function when the
P push-button is programmed to display the input
current in the operating mode. If either of these
two functions are used, the internal references
should be routinely calibrated against an external
4/20mA calibrator connected to the input terminals
of the instrument. See section 8.4
To calibrate the internal references select 'rEF'
from the sub-menu and press Pwhich will result in
a '.004A' prompt being displayed. Adjust the
external current calibrator to 4.000mA and again
press P . The instrument will display 'Ent' while the
4mA reference is being updated and will then
return to the '.004A' prompt.
To re-calibrate the 20mA internal reference, press
the Up button which will cause the instrument to
display '.020A'. Adjust the external current
calibrator to 20.000mA and again press P. The
instrument will display 'Ent' while the 20mA
reference is being updated and will then return to
the '.020A' prompt. This completes calibration of
the internal references, two operations of the E
button will return the instrument to the 'Cond'
prompt in the main menu.

16
6.10 Reset grand total: CLr. Gtot
The grand total is a separate sixteen digit counter
which duplicates the total display but is not zeroed
when the total display is reset to zero. The grand
total may be viewed in the operating mode in two
eight digit sections as described in section 2.1 of
this manual.
The grand total counter can only be reset to zero
from the 'CLr. Gtot' function in the main
programme menu. To zero the grand total
counter select 'CLr. Gtot' and press P which will
cause the instrument to display 'Clr. no' with 'no'
flashing. Continuously press the Up or Down
push-buttons until 'CLr. YES' is displayed and then
press Pwhich will result in a '0000' prompt. Using
the Up and Down buttons and the P button to
move to the next digit, confirm the request by
entering the password 'SurE'. Note 'S' is entered
as '5'. Pressing E will then reset the grand total
counter to zero and return the instrument to the
'CLr. Gtot' prompt in the main menu.
CAUTION
After resetting the grand total
counter to zero the old grand total
can not be recovered.
6.11 Timebase: t-bASE
Together with the total scale factor 'SCALE-t', this
function defines the arithmetic relationship
between the rate and total displays. To calculate
total flow the timebase divides the rate display by
1, 60 or 3,600 depending upon whether the
BA354ND rate display represents flow per second,
per minute or per hour. See Fig 6.
To check or change the timebase select 't-bASE'
from the main menu and press Pwhich will reveal
the current setting. Pressing the Up or Down
button will index though the following three options.
BA354ND
Rate display
Represents
Flow
Select
In
t-bASE
menu
Total display
= rate display
divided by
Per second tb – 1 1
Per minute tb – 60 60
Per hour tb – 3600 3600
Select the required divisor and press Eto return to
the main menu.
6.12 Function of the Ppush-button: C - - P
This parameter defines the function of the Ppush-
button when the BA354ND is in the operating
mode. While the Pbutton is pushed the
instrument will display the input current in
milliamps or as a percentage of the span.
To check or change the parameter select 'C - -P'
from the main menu and press Pto reveal the
current setting. Pressing the Up or Down button
will toggle the instrument between the two options;
'4-20' and 'PC', the input current in milliamps and
the input as a percentage of span. When the
required option is displayed press Eto store the
selection and return to the main menu.
Accuracy depends upon the accuracy of the
internal references which should be periodically
calibrated - see section 6.9.2
6.13 Total scale factor: SCALE-t
Together with the timebase 't-bASE', this is a
dividing factor which defines the arithmetic
relationship between the rate and total displays.
The total scale factor may be set to any value
between 0.0001 and 65535* allowing the total flow
and rate of flow to be displayed in different
engineering units.
SCALE-t = Units of rate display
Units of total display
When calculating SCALE-t the required units of
measurement for the total display must be
converted to those used for the rate display as
shown in following example:
The BA354ND rate display represents litres per
second but the total flow display is required in UK
gallons. There are 4.5461 litres in a UK gallon.
SCALE-t = Units of rate display
Units of total display
= 1 litre = 1 litre
1 gallon 1/(4.5461) litres
SCALE-t = 4.5461
Alternatively if the total display is required in
thousand of UK gallons
= 1 litre = 1 litre
1 gallon 1/(4546.1) litres
SCALE-t = 4546.1

17
The total scale factor SCALE-t is not dependent on
the rate display units of time. i.e. flow units per
second, minute or per hour. The timebase t-bASE
accounts for these differences.
To check or change the total scale factor select
'SCALE-t' from the main menu and press Pto
reveal the existing setting, one digit will be
flashing. The value of the flashing digit can be
changed by pressing the Up or Down buttons.
When this digit is correct pressing Pwill transfer
control to the next digit.
To position the decimal point, move the flashing
digit to the left hand side of the required decimal
point position and simultaneously press the Up and
Down buttons.
When the required total scale factor has been
entered, press E to store the number and return to
the main menu.
*Note: The maximum numerical value of SCALE-t
is 65535 irrespective of the decimal point position.
i.e. 6.5535; 65.535; 655.35; 6553.5 and 65535.
6.14 Percentage Clip-off: CLIP-OFF
To prevent totalisation of very low flow rates which
over long periods may result in significant
totalisation errors, the BA354ND rate display can
be forced to zero when the flow falls below a
specified value. The threshold may be adjusted
between 0 and 10% of flow for linear inputs, and
between 5 and 10% of flow for square law inputs
linearised by the root extractor.
To check or change the cut-off point select 'CLIP-
OFF' from the main menu and press Pto reveal
the current setting. The threshold which is shown
as a percentage of total flow may be adjusted in
one percent increments using the Up or Down
buttons. When set as required, press the E button
to enter the revised figure and return to the main
programme menu.
6.15 Local reset of total display: LOC. rSET
This function enables the operator to reset the
BA354ND total display to zero by operating the Up
and Down push-buttons simultaneously. To
check the status of the local reset function select
'LOC. rSET'' from the menu and press P which will
reveal if the function is 'On' or 'OFF'. If necessary
press the Up or Down button to change the setting,
followed by the E button to return to the main
menu.
6.16 Security code: COdE
The calibration and conditioning of the instrument
may be protected by a four digit security code
which must be entered before access to the
programme menu is granted. New instruments
are programmed with the default security code
0000 which allows unrestricted access to all
programming functions.
To enter a new security code select 'COdE' from
the menu and press P which will cause the
instrument to display the current security code.
Each digit of the code can be changed using the
Up and Down push-buttons, and the Pbutton to
move to the next digit. When the required code
has been entered press E to return to the main
menu. The revised security code will be activated
when the indicator is returned to the operating
mode.
If the security code is lost, access to the
programmable functions can be obtained by
moving the internal security link to the override
position. The original security code can then be
viewed by selecting 'CodE' from the main menu
and pressing P.
Fig 8 Location of security code override link

18
To gain access to the security code link, remove
the instrument control cover by undoing the two 'C'
screws - see Fig 4. If the instrument is fitted with
external push-buttons the connecting ribbon cable
should be un-plugged. The security code
override link is located on the inner row of the five
pin connector as shown in Fig 8.
6.17 Over and under-range
If the rate display range is exceeded the four least
significant digits will be blanked. Under-range is
indicated by a flashing ‘-1’ and over-range by a
flashing ‘1’. Under and over-range will also be
indicated if the input current falls below
approximately 3.6mA or rises above approximately
21mA.
If the input current falls below approximately 3mA
the instrument initialisation sequence is performed
as described in section 2.
When the total display exceeds 99999999 it will
automatically roll-over to zero and continue
counting. If this is likely to happen the grand total
should be reset at the start of the operation, the
most significant eight digits of the grand total will
then indicate how many times the total display has
rolled-over. The most significant eight digits of the
grand total can be viewed by pressing the Eand
Up buttons simultaneously Up to 108roll-overs
can be counted.
7. CALIBRATION EXAMPLES
This section includes two examples illustrating how
a BA354ND rate totaliser may be programmed and
calibrated to display the rate of flow and total flow
measured by a flowmeter with a 4/20mA output.
Section 7.1 describes the preferred method of
calibration using a traceable 4/20mA calibrator.
Section 7.2 contains an example of calibration
using the instruments internal 4 and 20mA
references, which although not traceable, are
adequate for many industrial applications.
7.1 Calibration example
Using an external current source
In this example the BA354ND rate totaliser is
connected to a flowmeter having an output of
20mA at a flow of 1100 litres / minute. The
BA354ND is required to display flow in litres per
minute and total flow in cubic metres with a
resolution of 0.1 cubic metres. Totalisation is to
occur for flow rates between 1 and 100% of
maximum flow. The frequency of the mains supply
is 50Hz and a security code of 1209 is required.
In the operating mode the BA354ND is required to
display the input current as a percentage of span
when the Ppush-button is operated.
Step 1 Connect instrument to calibrator
Connect the BA354ND to an accurate
current source such as a calibrator.
Terminal 1 positive and terminal 3
negative. The instrument will perform
the initialisation routine described in
section 2, and then display the input
current on the rate display using the
existing calibration information.
Step 2 Enter the programming mode
With input current between 4 and 20mA
put the instrument in the programming
mode by simultaneously pressing P
and E. Assuming a security code has
not already been entered the
instrument will respond by displaying
'root' which is the first function in the
main menu. See Figs 7A and 7B.
Step 3 Turn square root extractor off
With 'root' displayed, press Pwhich will
reveal the root extractor status. The
root extractor can be turned on or off by
operating the Up or Down buttons.
Select 'OFF', and press Eto return to
the 'root' prompt in the main menu.

19
Step 4 Select frequency of maximum
mains (line) rejection
Scroll though the main menu until
'Cond' is displayed and press Pwhich
will result in the instrument displaying
'0000' with the most significant digit
flashing. To prevent accidental
adjustment the Cond sub-menu is
protected by the code word 'SurE''
which should be entered character by
character using the Up and Down
buttons plus Pto move control to the
next digit. Note: S is entered as 5.
When 'SurE' has been entered pressing
Ewill result in the 'FrE' prompt. Press
Pto enter the function and using the Up
or Down buttons select '50'. Finally,
press Etwice to return to the 'Cond'
prompt in the main menu.
Step 5 Define function of P push-button
Select 'C--P' from the main menu and
press P to reveal the function of the P
button in the operating mode. Select
percentage 'PC' and return to the main
menu by pressing E
Step 6 Define rate display resolution
Select 'rESn' from the main menu and
press P to reveal the current resolution
of the rate display. Using the Up, Down
push buttons select a resolution of '1'
and return to the 'rESn' prompt in the
main menu by pressing E.
Step 7 Position rate & total decimal points
Scroll though the main menu until 'd.P.'
is displayed and then press P. The rate
and total displays will be activated with
one digit of the total display flashing.
Press the Up or Down push-button until
the second least significant digit of the
total display and following decimal point
are flashing i.e. a resolution of 0.1
Press Pto move control to the rate
display. Using the Up or Down push-
button move the flashing digit to the
least significant position (right hand
side) which will result in no decimal
point being displayed.
Finally press Eto return to the 'd.P.
prompt in the main menu.
Step 8 Calibrate the rate display
Scroll through the main menu until
'CAL' is displayed. Press P and the
instrument will request a 4mA input by
displaying 'ZErO'. Set the input current
to 4.0000mA and press Pagain which
will reveal the existing rate display.
Using the Up, Down and Ppush-
buttons enter the required zero display
of 0000 Press Eto enter this
calibration figure and return the
instrument to the 'ZErO' prompt.
Press the Up push-button and the
instrument will request a 20mA input by
displaying 'SPAn'. Set the input
current to 20.0000mA and again press
Pwhich will reveal the existing rate
display at 20mA. Using the Up, Down
and Ppush-buttons enter the required
display of 1100
Press Eto enter this calibration figure
and return the instrument to the 'SPAn'
'prompt' and again to return to the 'CAL'
prompt in the main menu.
Step 9 Define the timebase
The rate display represents flow per
minute so it is necessary to set the
instrument timebase to 60. This will
divide the rate display by 60 to provide
the correct total display.
Select 't-bASE' from the main menu
and press P to reveal the current
setting. Using the Up and Down push
buttons select 'tb - 60' and then return
to the main menu by pressing E.

20
Step 10 Define the totaliser scaling factor
In this example the rate display is in
litres per minute but the total display is
required in cubic metres:
SCALE-t = Units of rate display
Units of total display
There are 1,000 litres in a cubic metre
thus:
= litres
cubic metres
= 1 litre
1/(1000) litres
SCALE-t = 1000
From the main menu select 'SCALE-t'
and press Pto reveal the current five
digit dividing factor. Using the Up and
Down buttons to adjust the flashing
digit, and the P button to transfer
control between digits, set 'SCALE-t' to
1000.0
The position of the decimal point is
defined by moving the flashing digit to
the second least significant position and
operating the Up and Down buttons
simultaneously.
When 'SCALE-t' has been set to 1000.0
press Eto return to the main menu.
Step 11 Define percentage clip-off
Totalisation is to be inhibited at flow
rates below 1% of maximum flow. To
define this cut-off point select 'CLIP-
OFF' from the main menu and press P
which will reveal the current setting.
The figure can be increased or
decreased using the Up and Down
buttons. After adjustment press Eto
return to the main menu.
Step 12 Reset the grand total to zero
To reset the grand total to zero select
'CLr. Gtot' from the main menu and
press P which will cause the instrument
to display 'Clr. no'. Toggle this to 'CLr.
YES' using the Up or Down push-
buttons and press Pwhich will result in
a '0000' prompt. Using the Up, and
Down buttons and the P button to move
to the next digit, confirm the request by
entering the password 'SurE'. Note S is
entered as 5. Pressing E will then reset
the grand total counter to zero and
return the instrument to the 'CLr. Gtot'
prompt in the main menu.
Step 13 Set the security code
Entering a security code prevents
unauthorised access to the programme
functions. Select 'COdE' from the
main menu and press Pwhich for a
new instrument will reveal the default
code '0000' with the most significant
digit flashing. Adjust this digit using the
Up and Down buttons to display 1.
Pressing the P button will transfer
control to the next digit which should be
set to 2. Finally when the new code
1209 has been entered, press Eto
return to the main programme menu.
Step 14 Return to the operating mode
Following completion of programming
and calibration, return the instrument to
the operating mode by pressing E. All
the BA354ND programming functions
will now be stored in permanent
memory and protected from accidental
adjustment by the security code.