BEKA BA334D User manual

Issue: 13
3rd February 2011
BA334D
Intrinsically safe
Externally powered
pulse input
field mounting
rate totaliser
Issue 13

2
1. Description
2. Operation
2.1 Initialisation
2.2 Controls
2.3 Displays
3. Intrinsic Safety Certification
3.1 ATEX certificate
3.2 Power supply
3.3 Pulse input terminals
3.3.1 Voltage pulse
3.3.2 Contact, proximity detector or
open collector
3.4 Remote reset terminals
3.5 Zones, gas groups and T rating
3.6 Certification label information
4.System Design for Hazardous Area
4.1 System certificates
4.2 Use with Zener barriers
4.2.1 Power supply
4.2.2 Pulse input
4.2.3 Switch contact input
4.2.4 2-wire proximity detector
input
4.2.5 Voltage pulse input
4.2.6 Remote reset
4.3 Use with galvanic isolators
4.3.1 Power supply
4.3.2 Pulse input
4.3.3 Switch contact input
4.3.4 2-wire proximity detector
input
4.3.5 Voltage pulse input
4.3.6 Remote reset
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 Display update interval
6.5 Type of input
6.6 Position of the decimal points
6.7 Lower display
6.8 Rate scale factor
6.9 Timebase
6.10 Rate filter
6.11 Total scale factor
6.12 Clip-off
6.13 Local reset
6.14 Resetting grand total
6.15 Security code
7. Calibration Example
7.1 Calibration procedure
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 Intrinsic safety
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 Pulse output
9.4.1 Intrinsic safety
9.5 4/20mA output
9.5.1 Intrinsic safety
9.5.2 Programming & adjustment
9.6 External push-buttons
9.7 Pipe mounting kits
9.8 Stem mounting kit
10. Index
Appendix 1
ATEX dust certification
Appendix 2
FM Approval for use in the USA
CONTENTS
The BA334D is CE marked to show compliance with the
European Explosive Atmospheres Directive 94/9/EC
and the European EMC Directive 89/336/EEC

3
1. DESCRIPTION
The BA334D is an intrinsically safe, externally
powered pulse input rate totaliser primarily
intended for use with flowmeters. The
instrument simultaneously displays the rate of
flow and the total flow in engineering units on
two separate displays.
The BA334D has been certified intrinsically
safe by European Notified Body Intertek
Testing Sevices (ITS) to the ATEX Directive
94/9/EC for use in explosive gas and
combustible dust atmospheres.
ATEX dust certification is an option – see
Appendix 1.
For use in the USA a version having FM
intrinsic safety and nonincendive approval is
available - see Appendix 2.
Housed in a robust IP66 glass reinforced
polyester (GRP) enclosure with an armoured
glass window, the BA334D 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
BA334D. The instrument accepts pulses from
a single source and after scaling displays the
total number of pulses received and their rate
on separate displays. When connected to a
pulse output flowmeter the BA334D will provide
an accurate display of total flow and the rate of
flow.
The BA334D has two sets of input terminals for
connection to high or low level voltage pulses,
a switch contact, an open collector output or to
a two wire proximity detector. The instrument
may therefore be used with almost any type of
pulse output flowmeter. The total display
may be reset to zero by a remote switch
contact, the internal switches or via the
optional keypad on the outside of the
instrument.
Optional accessories enable the flow rate to be
transmitted to other equipment as an isolated
4/20mA analogue signal and the total flow to
be transmitted as a pulse signal. Optional
alarms, which may be programmed to function
on the rate or total displays, further extend the
instruments applications.
Fig 1 Simplified block diagram of BA334D
2.1 Initalisation
Each time power is applied to the instrument
initalisation is performed. After a short delay
the following display sequence occurs:
All segments of the display are activated
for about 2 seconds.
The product firmware part number and
version number are displayed for about 2
seconds.
Rate display and totaliser start to
function using calibration information
stored in the instrument's permanent
memory.
2.2 Controls
The BA334D 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 display mode i.e. when the instrument is
displaying rate and total flow the switch
functions are:
Description of Switch Functions
E+ Down While these buttons are pushed the
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.

4
Down Resets the total display to zero
+Up when these two push-buttons are
operated simultaneously for two
seconds.
Selectable function from
programme menu.
See section 6.12
PWhile these buttons are pushed the
+ Down instrument will display the firmware
part number and version number.
Note: When optional alarms are fitted, the
BA334D may be programmed to provide direct
access to the alarm setpoints from the display
mode when the P + Up push-buttons are
operated – see section 9.2
2.3 Displays
The BA334D has two digital displays and
associated annunciators, plus a flow indicator
as shown on page 1.
Rate Shows the flow rate on the
Display smaller six digit display.
Total Shows the total flow on the
display larger eight digit display. Set
to zero when local or remote
reset switch is operated.
Flow This disc in the lower left
indicator hand corner of the display 'rotates'
for two seconds each time an
input pulse is received.
Therefore when the pulse input
frequency exceeds 0.5Hz the
disc appears to rotate
continuously.
Hold Activated when input
Annunciator frequency is below the clip-off
threshold.
Reset Activated while instrument is
Annunciator being reset.
3. INTRINSIC SAFETY CERTIFICATION
3.1 ATEX certificate
The BA334D has been issued with an EC-Type
Examination Certificate by Notified Body
Intertek Testing Services (ITS) confirming
compliance with the European ATEX Directive
94/9/EC for Group II, Category 1, gas and dust
atmospheres, EEx ia IIC T5. The instrument
bears the Community Mark and subject to local
codes of practice, may be installed in any of
the European Economic Area (EEA) member
countries. ATEX certificates are also
acceptable for installations in Switzerland.
This manual describes installations in gas
hazardous areas which conform with BS
EN60079:Part14:2003 Electrical Installation in
Hazardous Areas. When designing systems
for installation outside the UK, the local Code
of Practice should be consulted.
For use in the presence of combustible gas,
please refer to Appendix 1 which describes
installations complying with BS EN 50281-1-
2:1999.
3.2 Power supply
When installed in a hazardous area the
BA334D must be powered via a Zener barrier
or galvanic isolator from a dc supply located in
the safe area.
The input safety parameters of terminals 1 and
2 are: Ui = 28V dc
Ii = 100mA dc
Pi = 0.7W
Any certified Zener barrier or galvanic isolator
with output safety parameters within these
limits may be used. The two system
certificates provide guidance to help selection
of suitable devices.
The maximum equivalent capacitance and
inductance between terminals 1 and 2 is:
Ci = 20nF
Li = 20µH
To determine the maximum permissible cable
parameters the above figures should be
subtracted from the maximum permitted cable
parameters specified for the Zener barrier or
galvanic isolator powering the BA334D.

5
3.3 Pulse input terminals
The BA334D rate totaliser has two alternative
pairs of input terminals enabling the instrument
to count pulses from a wide variety of sources.
Note: Only one pair of input terminals may be
used at one time.
3.3.1 Voltage pulse input
Terminals 3 and 4 are intended for connection
to a voltage pulse source. In Europe, sources
of energy which do not generate more than
1.5V; 100mA and 25mW are, for intrinsic safety
purposes, considered to be simple apparatus
(Clause 5.4 of EN50 020:1994).
Although the BA334D indicator does not itself
comply with the requirements for simple
apparatus, the EC-Type Examination
Certificate specifies that under fault conditions
the voltage, current and power at terminals 3 &
4 will not exceed those specified for simple
apparatus. This allows these input terminals
to be connected to any certified intrinsically
safe apparatus or circuit providing that the
output parameters of the apparatus or circuit
do not exceed: Uo = 28V dc
Io = 100mA dc
Po = 0.7W
The certified intrinsically safe voltage pulse
output of a flowmeter mounted in a hazardous
area, or the output of a certified magnetic pick-
off mounted in a hazardous area may be
directly connected to these terminals providing:
The output parameters of the device do
not exceed the figures shown above.
The device can withstand a 500V rms
insulation test to earth for one minute.
The BA334D EC-Type Examination Certificate
specifies that the maximum equivalent
capacitance and inductance between the two
pulse input terminals 3 and 4 is:
Ci = 20nF
Li = 20µH
To determine the maximum permissible cable
parameters these figures must be subtracted
from the maximum permitted cable parameters
specified for the device connected to terminals
3 and 4.
The BA334D system certificates specify
maximum permitted cable parameters when a
28V 300ΩZener barrier or galvanic isolator is
connected to these terminals.
3.3.2 Contact, 2-wire proximity detector
or open collector input
Terminals 5 and 6 are intended for connection
to a switch contact, a certified open collector
output or a certified intrinsically safe 2-wire
NAMUR proximity detector. The output safety
parameters are:Uo = 10.5V dc
Io = 9.2mA dc
Po = 24mW
and the maximum permitted external
capacitance and inductance is:
Co = 2.0µF
Lo = 248mH
Mechanically operated switch contacts comply
with the requirements for simple apparatus.
Providing the switch and the BA334D are both
located in the same hazardous area, the switch
may be connected directly to terminals 5 & 6.
This also applies to most magnetically
operated reed switches used in turbine
flowmeters.
Similarly, certified intrinsically safe open
collector outputs may be directly connected to
terminals 5 and 6
A certified intrinsically safe 2-wire proximity
detector may also be connected directly to
terminals 5 & 6 providing the input safety
parameters of the detector are less than the
output parameters of terminals 5 & 6. For
guidance the BA334D system certificates
specify some of the intrinsically safe 2-wire
proximity detectors that may be used.
In all cases the device and circuit connected to
terminals 5 & 6 must be capable of
withstanding a 500V rms insulation test to
earth for one minute.
The maximum input safety parameters for
terminals 5 & 6 are:
Ui = 28V dc
Ii = 100mA dc
Pi = 0.7W
and the internal capacitance and inductance is:
Ci = 20nF
Li = 20µH
which allows Zener barriers and galvanic
isolators to be connected to these terminals.
The BA334D system certificates specify the
maximum permitted cable parameters when a
28V 300ΩZener barrier or galvanic isolator is
used to transfer a pulse from the safe area to
the BA334D in a hazardous area.

6
3.4 Remote reset terminals
The BA334D total display may be reset to zero
by connecting the reset terminals 7 and 8
together for more than one second. These two
terminals have the following input and output
safety parameters:
Uo = 3.8V dc
Io = 1.6mA dc
Po = 2.0mW
Ui = 28V dc
Ii = 100mA dc
Pi = 0.7W
The maximum equivalent capacitance and
inductance between them is:
Ci = 1nF
Li = 0µH
The total display may be reset to zero from
within the hazardous area by any mechanically
operated switch connected directly to terminals
7 and 8.
To reset the total display from the safe area a
Zener barrier or intrinsically safe relay is
required to transfer the contact closure into the
hazardous area. Almost any intrinsically safe
relay with certification permitting the contacts
to be connected to equipment in the hazardous
area may be used. A positive diode return
Zener barrier may also be used as shown in
Fig 2. The system certificates list suitable
devices and define the maximum cable
parameters.
Note: The BA334D may be programmed so
that the total display can be reset to zero when
the Up and Down push-buttons are operated
simultaneously for more than two seconds.
See 6.12
3.5 Zones, gas groups and T rating
The BA334D has been issued with an EC Type
Examination certificate confirming that it
complies with the requirements for Group II
Category 1 G EEx ia IIC T5 (Tamb –40 to
60oC) specified in the ATEX Directive. When
connected to a suitable system the BA334D
may be installed in:
Zone 0 explosive gas air mixture
continuously present.
Zone 1 explosive gas air mixture
likely to occur in normal
operation.
Zone 2 explosive gas air mixture
not likely to occur, and if it
does will only exist for a
short time.
Be used with gases in groups:
Group A propane
Group B ethylene
Group C hydrogen
Having a temperature classification of:
T1 450oC
T2 300oC
T3 200oC
T4 135oC
T5 100oC
At an ambient temperature between –40 and
+60oC.
Note: the guaranteed operating temperature
range is –20 to +60oC
This allows the BA334D to be installed in all
Zones and to be used with most common
industrial gases.
3.6 Certification Label Information
The certification label is fitted in a recess on
the top outer surface of the enclosure. It
shows the ATEX certification information plus
BEKA associates name and location. Non
European certification information may also be
included. The serial number and date of
manufacture are recorded on a separate label
inside the terminal compartment.

7
4. SYSTEM DESIGN FOR HAZARDOUS
AREA
4.1 System certificates
In addition to the ATEX EC-Type Examination
Certificate, ITS have issued two system
certificates. One defines how the BA334D may
be used with Zener barriers and the other with
galvanic isolators. Both are divided into two
sections to cover input signal sources in the
hazardous and in the safe area.
Interface Certificate No
Zener barriers Ex01E2005
Galvanic isolators Ex01E2006
This section interprets these system
certificates and illustrates how to design
systems with Zener barriers and galvanic
isolators.
System certificates are Certificates of
Conformity which are primarily issued for
guidance in the UK. They do not form part of
certification to the European ATEX Directive.
4.2 Use with Zener barriers
Zener barriers are the least expensive
intrinsically safe interface between a safe and
hazardous area. However they do not provide
isolation and require a high integrity earth
connection that may be expensive to install.
For a single BA334D it may be less expensive
and complicated to use galvanic isolators when
a high integrity earth connection is not already
available.
Any certified Zener barriers may be used with
the BA334D providing their output parameters
do not exceed the input parameters of the
terminals to which they are connected. Only
one polarity of Zener barrier i.e. positive or
negative , may be used with an instrument.
To assist with system design, the Zener barrier
system certificate specifies the maximum cable
parameters for popular barriers and lists some
of the diode return barriers that may be used.
Fig 2 illustrates the basic circuit that is used for
all BA334D installations protected by Zener
barriers. For simplicity, connections for the
optional pulse output, 4/20mA output and
backlight are included in the appendix to this
manual.
Alternatively the pulse source may be located
in the safe area. Fig 3 shows how an
additional Zener barrier is used to transfer the
signal to the rate totaliser in the hazardous
area. When more than one Zener barrier is
used in a system all must have the same
polarity. i.e. all positive or all negative barriers.
Fig 2 BA334D used with Zener barriers
When designing a system it is important to
remember that terminals 2, 4, 6 and 8 are
interconnected within the BA334D - see Fig 1.
4.2.1 Power supply
A BA334D is powered from the safe area via a
positive polarity 28V 300ΩZener barrier which
will have an end-to-end resistance of about
340Ω. When used with a proximity detector
input the BA334D consumes approximately
25mA and requires a minimum voltage of 10V
between terminals 1 and 2. The supply
voltage in the safe area must therefore be
between 18.5V and the maximum working
voltage of the Zener barrier – usually about
26V.
4.2.2 Pulse input
As shown in Fig 2 the BA334D will count
pulses from a wide variety of sources in the
hazardous area, or from the safe area as
shown in Fig 3. Terminals 5 and 6 are for
pulse sources that need powering e.g. a switch
contact, an open collector or a 2-wire NAMUR
proximity detector.
Terminals 3 and 4 are for voltage pulse inputs.
Note: Only one input may be used at a time.
i.e pulses can not be counted at terminals 3 &
4 and at 5 & 6 at the same time.
No Zener barrier is required in series with the
input if the intrinsically safe pulse source is
located within the hazardous area.

8
The following table shows the switching
thresholds for the various transducers, plus the
maximum operating frequency and the input
terminal numbers. For reliable counting the
input signal must fall below the lower threshold
and rise above the upper threshold.
Switching
thresholds Freq max Input terminals
Switch 100Ω1000Ω100Hz 5 & 6
Proximity
detector 1.2mA 2.1mA 5 kHz 5 & 6
Open
collector 2kΩ10kΩ5kHz 5 & 6
Magnetic
pick-off 0mV 20mV peak 5kHz 3 & 4
Voltage
pulse 1.0V 3.0V 5kHz 3 & 4
4.2.3 Switch contact input
Any mechanically activated switch contact
located in the hazardous area may be directly
connected to terminals 5 & 6 providing it can
withstand a 500V rms insulation test to earth.
This includes most magnetically activated reed
relays used in turbine flowmeters. The
BA334D contains filtering to prevent contact
bounce being counted, this limits the maximum
operating frequency for a switch contact to
100Hz.
4.2.4 2-wire proximity detector input
Any certified intrinsically safe 2-wire proximity
detector complying with NAMUR switching
thresholds may be used, providing the input
safety parameters are greater than the output
safety parameters of terminals 5 & 6. The
system certificates list some of the acceptable
devices.
When programmed to operate with a proximity
detector, the BA334D maximum input
frequency is 5kHz.
4.2.5 Voltage pulse input
Voltage pulse sources should be connected to
terminals 3 and 4. These terminals comply
with the requirements for simple apparatus and
may be directly connected to any certified
intrinsically safe voltage source within the
hazardous area which can withstand a 500V
rms insulation test to earth for one minute and
has output parameters equal to or less than:
Uo = 28V dc
Io = 100mA dc
Po = 0.7W
This enables the BA334D to be connected
directly to most flowmeters incorporating a
certified intrinsically safe magnetic pick-off, or
a certified intrinsically safe amplifier producing
a high level pulse output. The BA334D has
two programme selectable voltage switching
thresholds, ‘COIL’ for magnetic pick-offs and
‘UOLtS’ for higher voltage pulses.
Maximum voltage pulse counting frequency is
5kHz.
Fig 3 Pulse source in safe area
4.2.6 Remote reset
The BA334D total display is reset to zero
when terminals 7 & 8 are connected together
for more than one second.. Permanent
interconnection inhibits totalisation. Remote
resetting may be accomplished by any
mechanically operated switch located in the
hazardous area providing it can withstand a
500V ac insulation test to earth. No Zener
barrier is required.
The BA334D may be reset to zero from the
safe area. Any switch may be used but a
Zener barrier is required to transfer the contact
closure into the hazardous area. Any one of
the diode return barriers specified on the
system certificate is suitable for this application
and this may be combined with the supply
barrier so that only one package is required.
Fig 2 illustrates how the BA334D may be reset
from both the safe and the hazardous area.
Note: The BA334D can be programmed to
reset the total display to zero when the up and
down push-buttons are operated
simultaneously for more than two seconds. –
see 6.12

9
4.3 Use with Galvanic Isolators
Galvanic isolators are probably the simplest
intrinsically safe interface as they provide
isolation and do not require a high integrity
earth connection.
Any certified galvanic isolator with output
parameters less than the input parameters of
the BA334D may be used. The BA334D
system certificates list some of the suitable
devices together with the maximum permitted
cable parameters
Fig 4 BA334D used with galvanic isolators
Fig 4 illustrates the basic circuit that is used for
all BA334D installations protected by galvanic
isolators. For simplicity, connections for the
optional pulse output, 4/20mA output and
backlight are included in the appendix to this
manual.
Alternatively the pulse source may be located
in the safe area. Fig 5 shows how an
additional galvanic isolator is used to transfer
the signal to the rate totaliser in the hazardous
area.
Fig 5 Pulse source in safe area
4.3.1 Power supply
The BA334D galvanic isolator system
certificates list a wide range of certified
galvanic isolators that may be used to power
the rate totaliser. If using the entity concept to
select an isolator, in addition to matching the
safety parameters the isolator must be capable
of supplying at least 25mA at 10Vdc to the
BA334D.
4.3.2 Pulse input
As shown in Fig 4 the BA334D will count
pulses from a wide variety of sources.
Terminals 5 and 6 are for sources that need
powering e.g. a switch contact or a 2-wire
NAMUR proximity detector. Terminals 3 and 4
are for voltage inputs.
Note: Only one input may be used at a time,
i.e pulses can not be counted at terminals 3 &
4 and at 5 & 6 at the same time. No galvanic
isolator is required in series with the input if the
pulse source is located within the hazardous
area.
The following table shows the switching
thresholds for the various transducers, plus the
maximum operating frequency and the input
terminal numbers. For reliable counting the
input signal must fall below the lower threshold
and rise above the upper threshold.

10
Switching
thresholds Freq max Input terminals
Switch 100Ω1000Ω100Hz 5 & 6
Proximity
detector 1.2mA 2.1mA 5 kHz 5 & 6
Open
collector 2kΩ10kΩ5kHz 5 & 6
Magnetic
pick-off 0mV 20mV peak 5kHz 3 & 4
Voltage
pulse 1.0V 3.0V 5kHz 3 & 4
4.3.3 Switch contact input
Any mechanically activated switch contact
located in the hazardous area may be directly
connected to terminals 5 & 6 providing it can
withstand a 500V rms insulation test to earth
for one minute. This includes most
magnetically activated reed relays used in
turbine flowmeters. The BA334D contains
filtering to prevent contact bounce being
counted which limits the maximum operating
frequency for a switch contact to 100Hz.
4.3.4 2-wire proximity detector input
Any certified intrinsically safe 2-wire proximity
detector listed on the system certificate may be
connected to input terminals 5 and 6. The
BA334D input complies with the NAMUR
switching standard and other certified
intrinsically safe detectors may be used
providing the safety parameters of the
proximity detector are compatible with the
BA334D.
When programmed to operate with a proximity
detector, the BA334D maximum input
frequency is 5kHz.
4.3.5 Voltage pulse input
Voltage pulse sources should be connected to
terminals 3 and 4. These terminals comply
with the requirements for simple apparatus.
They may be directly connected to any certified
intrinsically safe voltage source within the
hazardous area, providing it can withstand a
500Vrms insulation test to earth for one minute
and has output parameters equal to or less
than:
Uo = 28V dc
Io = 100mA dc
Po = 0.7W
This enables the BA334D to be connected
directly to most flowmeters incorporating a
certified intrinsically safe magnetic pick-off, or
a certified intrinsically safe amplifier producing
a high level pulse output. The BA334D has
two programme selectable voltage switching
thresholds, ‘COIL’ for magnetic pick-offs and
‘UOLtS’ for higher voltage pulses.
Maximum voltage pulse counting frequency is
5kHz.
4.3.6 Remote reset
The BA334D total display is reset to zero
when terminals 7 & 8 are connected together
for more than one second. Permanent
interconnection inhibits totalisation. Remote
resetting may be accomplished by any
mechanically operated switch located in the
hazardous area providing it can withstand a
500Vrms insulation test to earth for one
minute. No galvanic isolator is required.
The BA334D may be reset to zero from the
safe area. Any switch may be used but a
galvanic isolator is required to transfer the
contact closure into the hazardous area. Fig 4
illustrates how the BA334D may be reset from
both the safe and the hazardous area.
Note: The BA334D can be programmed to
reset the total display to zero when the up and
down push-buttons are operated
simultaneously for more than two seconds. –
see 6.12.

11
5. INSTALLATION
5.1 Location
The BA334D 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 BA334D enclosure is surface mounting.
Accessory kits described in sections 9.7 & 9.8
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.
The BA334D earth terminal is connected to the
internal EMC filters. For maximum radio
frequency interference rejection this terminal
should be connected to a local earth, or to a
cable screen which is earthed in the safe area.
The BA334D enclosure is supplied with a
bonding plate to ensure electrical continuity
between the three conduit / cable entries.
5.2 Installation Procedure
Fig 6 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 9.7
c. Remove the temporary dust seals from
the three cable entries and install the
required glands, conduit fittings or
blanking plugs.
Note: The temporary dust seals fitted for
transit do not maintain the IP66
protection of the BA334D enclosure.
d. Connect the field wiring to the terminals
as shown in Fig 7.
e. Replace the instrument terminal cover
and evenly tighten the two 'A' screws.
Fig 6 BA334D installation procedure
5.3 EMC
The BA334D complies with the requirements of
the European EMC Directive 89/336/EEC. For
specified immunity all wiring should be in
screened twisted pairs and the BA334D earth
terminal should be locally earthed or 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.

12
Fig 7 Dimensions and terminal connections

13
6. PROGRAMMING & CALIBRATION
The BA334D 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 that is shown
diagramatically in Fig 9. Each function is
summarised in section 6.3 and 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 BA334D is fitted with alarms, pulse
output or 4/20mA output, the basic menu is
expanded to include the option(s). Section 9
of this manual explains how to programme
these additional functions.
Note: While the instrument is being
programmed or calibrated, totalisation
continues so that any flow occurring during this
time is recorded.
6.1 Calibration structure
Fig 8 shows the BA334D calibration structure.
The rate and total display calibration functions
are totally independent allowing the displays to
have different engineering units.
For the rate display the pulse input is scaled by
SCALE-r to represent engineering units and
multiplied by the timebase t-bASE to calculate
and display the rate of flow per second, minute
or hour.
Similarly, to calculate the total flow in
engineering units the number of input pulses is
divided by the total scale factor SCALE-t. Total
flow is continuously added to the grand total.
The BA334D displays ‘real’ decimal points.
Moving the position of a decimal point in a
scale factor will therefore affect the instrument
calibration.
The BA334D updates its total flow calculation
twice per second. If the instrument is used for
batching applications, this resolution may
define the accuracy of the system.
Note: The total and rate displays may be
updated less frequently depending upon the
display update time selected.
Fig 8 Calibration structure
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
'UPdAtE' 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-buttons 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 'UPdAtE' to be displayed. If an
incorrect code is entered, or a push-button is
not operated within ten seconds, the
instrument will 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 Fig 9.

14

15
All new BA334D rate totalisers are supplied
calibrated as requested at the time of ordering.
If calibration information is not supplied, the
instrument will be conditioned for an open
collector input, with SCALE-r and SCALE-t set
to 1 and a timebase of seconds.
6.3 Summary of programmable functions
This section summarises all the programmable
functions. When read in conjunction with Fig 9
it provides a quick aid for programming the
instrument. If more detail is required, each
section contains a reference to a full
description of the function.
SUMMARY
Display Description of function
‘UpdAtE’ Display update time
Allows the interval between
display updates to be selected.
See section 6.4
'InPut' Type of input
Enables one of five types of
input to be selected:
UOLtS Voltage pulse
COIL Magnetic pick-off
Pr.dEt NAMUR proximity
detector.
COntACt Switch contact
OP.COL Open collector
See section 6.5
'd.P.' Decimal points
Defines the position of the
decimal point in both the rate
and total displays and enables
the rate and total displays to
be interchanged.
See section 6.6
‘dISPLAY.2’ Lower display
Turns the lower display, which
normally shows rate, on or off.
See section 6.7
Display Description of function
'SCALE-r' Rate Scale Factor
Defines the arithmetic relationship
between the pulse input frequency
and the rate display. May be
adjusted between 0.001 and
99999999.
When used with a flowmeter,
SCALE-r should be set to the
flowmeter K factor (pulses per unit
of measurement) if the display is
required in the same units as the
K factor.
See section 6.8
't-bASE' Timebase
Selectable multiplier to display
flow rate in units per second, per
minute or per hour..
Select: tb-1 for flow / second
tb-60 for flow / minute
tb-3600 for flow / hour
See section 6.9
'FILtEr' Rate filter
Adjustable digital filter to reduce
noise on the rate display. Two
parameters each adjustable
between 0 and 9.
See section 6.10
'SCALE-t' Total Scale Factor
Defines the arithmetic relationship
between the number of input
pulses and the total display.
May be adjusted between 0.001
and 99999999.
When used with a flowmeter
SCALE-t should be set to the
flowmeter K factor (pulses per unit
of measurement).
See section 6.11
'CLIP-OFF' Clip off
To prevent the totalisation of very
low flow rates, clip-off enables the
user to select a flow rate below
which totalisation is inhibited.
See section 6.12

16
Display Description of function
'LOC.rSEt'Local reset of total display
When turned 'On' the total display
may be reset to zero from the
display mode by simultaneously
operating the Up and Down push-
buttons for two seconds.
See section 6.13
'CLr. Gtot'Clears 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 6.14
'COdE' Security code
Defines a four digit numeric code
which must be entered to gain
access to the programmable
functions. Default code 0000
disables the security function and
allows unrestricted access to all
programmable functions.
See section 6.15
6.4 Display update interval: ‘UpdAtE’
Six different intervals between display updates
varying between 0.5 and 5 seconds may be
selected. If either the rate or the total displays
are likely to change rapidly, a longer interval
between updates may simplify reading the
instrument display. The selected update
interval does not affect the update time of any
other instrument function such as the optional
4/20mA output.
To define the update interval select ‘UpdAtE’
from the main menu and press Pto reveal the
current time. Pressing the Up or Down button
will scroll through the six times. When the
required interval has been selected press Eto
return to the main menu.
6.5 Type of input: ‘InPut’
The BA334D may be programmed to accept
pulse inputs from a wide variety of sensors.
To define an input type select ‘InPut’ from the
menu and press Pwhich will reveal the current
input type. Pressing Up or Down will scroll
through the five options:
‘UOLts’ Voltage pulse input
Threshold 1V and 3V
5kHz max.
Input terminals 3 and 4
‘COIL’ Low voltage pulse
Threshold 20mV
peak. 5kHz max.
Input terminals 3 and 4
‘Pr.dEt’ NAMUR proximity detector
Threshold 1.2 and 2.1mA
5kHz max.
Input terminals 5 and 6
‘COntACt’ Switch contact
Threshold 100 and 1000Ω
100Hz max
Input terminals 5 and 6
‘OP.COL’ Open collector
Threshold 2kΩand 10kΩ
5kHz max.
Input terminals 5 and 6
When the required type of input has been
selected press Eto return to the main menu.
Note: To count correctly, the input signal must
fall below the lower switching threshold and
rise above the higher switching threshold.
6.6 Position of the decimal points: ‘d.P.’
The rate display can have up to six digits and
the decimal point may be positioned between
any of them, or omitted. 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 point
select 'd.P.' from the main menu and press P.
This will activate both displays with one digit
plus 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 E
to 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 six digits but the total
display will be reduced from eight to six digits.

17
The rate and total annunciators will also be
interchanged. Pressing the Up and Down
buttons simultaneously will interchange the
displays.
Note: Both decimal points must be
repositioned after the displays have been
interchanged.
6.7 Lower display: ‘dISPLAY.2’
This function turns the lower display on or off.
When turned off, the BA334D will only have
one eight digit display which may be
programmed to show total flow or rate of flow.
To check the status of the lower display select
‘dISPLAY.2’ from the menu and press Pwhich
will reveal if the function is ‘On’ or ‘OFF’. The
setting can be changed by pressing the Up or
Down button followed by the Ebutton to return
to the main menu.
6.8 Rate scale factor: ‘SCALE-r’
Together with the instrument timebase, this
function defines the arithmetic relationship
between the pulse input frequency and the rate
display. When used with a flowmeter SCALE-r
should be set to the K-factor of the flowmeter
i.e. the number of pulses the flowmeter
produces for a unit of flow. e.g. 45.6 pulses
per litre. See section 7 for a worked example.
SCALE-r is a dividing factor that may be
adjusted between 0.001 and 99999999.
To check or change the rate scale factor select
'SCALE-r' 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 in the rate scale
factor, 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 rate scale factor has been
entered, press E to store the number and
return to the main menu.
6.9 Timebase: ‘t-bASE’
The timebase multiplies the rate display by 1,
60 or 3,600 depending upon whether the
BA334D is required to display rate per second,
per minute or per hour. See Fig 8.
To check or change the timebase, select
't-bASE' from the main menu and press P
which will reveal the current setting. Pressing
the Up or Down button will index through the
three options: tb-1 for flow / second
tb-60 for flow / minute
tb-3600 for flow / hour
Select the required multiplier and press Eto
return to the main menu.
6.10 Rate filter: ‘FILtEr’
This digital filter has two independent
adjustable parameters enabling the rate
display frequency response to be tailored for
optimum performance.
The filter parameters are controlled by a two
digit number. The first digit defines the amount
of filtering applied to the display as shown
below.
First digit Filter time constant
seconds
0X 0
1X 1.3
2X 4.3
3X 6.5
4X 8.7
5X 11.3
6X 15.7
7X 20.9
8X 25.2
9X 31.5
The second digit defines the deviation from the
displayed rate at which the filter will be
overridden and the rate display will move
rapidly to the new value.
Second
digit Magnitude of step change which will
produce a rapid
response
X0 Off
X1 1%
X2 2%
X3 4%
X4 8%
X5 12%
X6 16%
X7 24%
X8 32%
X9 64%
By careful adjustment of the two parameters a
stable display with an acceptable step input
response can be obtained for most
applications.
During commissioning it is recommend that

18
initially the second digit is set to 0 (off) and the
first digit is adjusted to provide acceptable rate
display stability. The second digit should then
be increased until the selected step size is
greater than the noise on the display signal, at
which setting the rate display will again
become stable. These will be the optimum
filter parameters for acceptable rate display
stability and a fast response to a large rate
signal change.
To check or change the filter select 'FILtEr'
from the main menu and press Pto reveal the
current settings. Pressing the Up or Down
button will change the flashing digit and Pwill
transfer control to the second digit. While
making adjustments the filtered rate display is
shown on the lower display so that stability can
be assessed. When set as required, press the
Ebutton to enter the revised parameters and
return to the main menu.
.
6.11 Total scale factor: ‘SCALE-t’
This factor defines the arithmetic relationship
between the number of input pulses and the
total display. SCALE-t is a dividing factor that
may be adjusted between 0.001 and
99999999. See Fig 8.
When used with a flowmeter SCALE-t should
be set to the K-factor of the flowmeter i.e. the
number of pulses the flowmeter produces for a
unit of flow. If the BA334D total display is
required in units different from those in which
the flowmeter K factor is specified, a
conversion factor will be required.
e.g. If the flowmeter has a K factor of 45.6
pulses per litre and the BA334D total display is
required in units of 1,000 gallons, then
SCALE-t should be set to number of pulses
produced by the flowmeter per 1,000 gallons:
45.6 x 4.54609 x 1000
207,301.7 pulses per 1000 gallons
.
(there are 4.54609 litres in a UK gallon)
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 in the scaling
factor, 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.
6.12 Clip-off: ‘CLIP-OFF’
To prevent totalisation of very low flow rates
that over long periods may result in significant
totalisation errors, the BA334D may be
programmed to stop totalising when the flow
rate falls below an adjustable threshold.
To check or change the clip-off threshold select
'CLIP-OFF' from the main menu and press P
which will reveal the current setting. The
threshold is shown in the units already selected
for the flow rate display. One digit will be
flashing. The value of the flashing digit may be
changed by pressing the Up or Down buttons.
When this digit is correct pressing Pwill
transfer control to the next digit. When clip-off
is set as required, press the E button to enter
the revised figure and return to the main
programme menu.
If the flow rate falls below the entered
threshold, the rate display will show zero flow,
totalisation will stop and the HOLD annunciator
will be activated. The flow indicator will rotate
for 2 seconds each time an input pulse is
received i.e. at input frequencies above
0.5Hz it will appear to rotate continuously.
Note: When the rate scale factor SCALE-r, the
timebase t-bASE, or the position of the rate
display decimal point are changed, clip-off will
automatically be reset to zero. If required, a
new clip-off threshold may then be entered.
6.13 Local reset of total display:
‘LOC. rSEt’
When activated this function enables the
operator to reset the BA334D total display to
zero in the display mode by operating the Up
and Down push-buttons simultaneously for
more than two seconds. 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.
The total display may also be reset to zero
remotely by connecting terminals 7 and 8
together. See sections 4.2.6 and 4.3.6 of this
manual.

19
6.14 Resetting 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
display mode in two eight digit sections as
described in section 2.2 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 'CLr 0000' prompt with one digit flashing.
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.
WARNING
After resetting the grand total
counter to zero the old grand
total can not be recovered.
6.15 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 without entering a security code.
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 display 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.
To gain access to the security code link,
remove the instrument control cover by
undoing the two ‘C’ screws – see Fig 6. If the
instrument is fitted with external push-buttons
the connecting ribbon cable should be
unplugged from the outer row of the five pin
connector. The security code override link is
located on the inner row of the five pin
connector as shown in Fig 10.
Fig 10 Location of security override link

20
7. CALIBRATION EXAMPLE
In this example a BA334D rate totaliser is
connected to a turbine flowmeter having a K-
factor of 1050.0 pulses per litre. The
flowmeter has a magnetic pick-off with a peak
output greater than 20mV at 5 litres per minute
and a usable range of 5 to 60 litres per minute.
The BA334D is required to display rate of flow
in litres per hour with a resolution of one litre
and total flow in cubic metres with a resolution
of 0.01 cubic metres. Totalisation is to stop
when the flow rate falls below 300 litres per
hour. The display is to be updated twice per
second and filtering is required. In this
application the operator needs to reset the total
display to zero by simultaneously pushing the
Up and Down push-buttons. To prevent
tampering the instrument programme menu is
to be protected by security code 1209
7.1 Calibration procedure
The BA334D rate totaliser may be calibrated
on-site without disconnection from the power
supply or from the flowmeter.
Step 1 Enter the programming mode
Put the BA334D 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 'UPdAtE' which is the
first function in the main menu.
See Fig 9.
Step 2 Select the interval between
display updates
With 'UPdAtE' displayed, press P
to reveal the existing interval
between display updates. If this is
not as required, press the Up or
Down button until ‘0.5’ is displayed.
(0.5 seconds i.e. 2 display updates
per second). Enter the revised time
and return to the 'UPdAtE' prompt
in the main menu by pressing E.
Step 3 Select the type of input
Using the Up or Down button scroll
through the main menu until ‘InPut’
is displayed, then press Pto reveal
the existing setting. Select ‘COIL’,
the input for a magnetic pick-off,
using the Up or Down button and
return to the 'InPut' prompt in the
main menu by pressing E.
Note: The BA334D has two pairs of
input terminals. 3 & 4 for voltage
inputs and 5 & 6 for switch contact,
proximity detector or open collector
inputs. Ensure that the magnetic
pick-off that has a voltage output is
connected to terminals 3 & 4.
Step 4 Position rate & total decimal
points
Select ‘d.P.’ from the main menu
and 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 third least significant digit
of the total display and following
decimal point are flashing. This
gives the required total display
resolution of 0.01
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 5 Enter the rate scaling factor
Select ‘SCALE-r’ from the main
menu and press Pto show the
current figure. The K factor of the
flowmeter in this example is
1050.0* pulses per litre which
should be entered as the rate
scaling factor.
Firstly to position the decimal point,
operate the Ppush-button to move
the flashing digit to second least
significant position. Pressing the
Up and Down buttons
simultaneously will then position the
decimal point in front of the least
significant digit.
Using the Up and Down buttons to
adjust each digit in turn and the P
button to transfer control between
digits, enter 1050.0 Finally return
to the 'SCALE-r' prompt in the main
menu by pressing E.
* Could also be entered as 1050