BEKA BA368E User manual

Issue: 5
9th July 2019
BA368E
Two Input
Intrinsically safe
Counter
Issue 5

1. Description
2. Operation
2.1 Initialisation
2.2 Controls
2.3 Displays
3. Intrinsic Safety Certification
3.1 ATEX gas certification
3.2 Zones, gas groups & T rating
3.3 Special conditions for safe use
3.4 Power supply
3.5 Pulse input terminals
3.5.1 sensors that do not require
energising.
3.5.2 sensors that do require
energising.
3.6 Remote reset terminals
3.7 Certification label information
4. System Design for Hazardous Areas
4.1 Use with Zener barriers
4.1.1 Power supply
4.1.2 Pulse input
4.1.3 Switch contact input
4.1.4 2-wire proximity detector input
4.1.5 Open collector
4.1.6 Magnetic pick-off input
4.1.7 Voltage pulse input
4.1.8 Remote reset
4.2 Use with galvanic isolators
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 Open collector
4.2.6 Magnetic pick-off input
4.2.7 Voltage pulse input
4.2.8 Remote reset
5. Installation
5.1 Location
5.2 EMC
5.3 Installation procedure
5.4 Scale card
6. Configuration and Calibration
6.1 Calibration structure
6.2 Accessing configuration functions
6.3 Summary of configuration functions
6.4 Input A
6.5 Input A type
6.6 Input A debounce
6.7 Input b
6.8 Input b type
6.9 Input b debounce
6.10 Input A pulse counting edge
6.11 Input b pulse counting edge
6.12 Display update interval
6.13 Counting function
6.14 Upper display
6.15 Lower display
6.16 Position of decimal points
6.17 Total scale factor
6.18 Rate scale factor
6.19 Timebase
6.20 Display filter
6.21 Direction of count
6.22 Reset value
6.23 Local reset
6.24 Local total reset
6.25 Local grand total reset
6.26 Reset grand total from configuration
menu.
6.27 Security code
6.28 Reset configuration to factory defaults
6.29 Display overflow
7. Pulse Output
7.1 Intrinsic safety
7.2 System design
7.3 Configuration
7.4 Access pulse output sub-menu
7.5 Enable pulse output
7.6 Source of output pulse
7.7 Divide output pulse frequency
7.8 Output pulse width
8. Configuration example
2222222222222222222222222
CONTENTS
The BA368E is CE marked to show compliance with the European Explosive Atmospheres Directive
2014/34/EU and the European EMC Directive 2014/30/EU

9. Maintenance
9.1 Fault finding during commissioning
9.2 Fault finding after commissioning
9.3 Servicing
9.4 Routine maintenance
9.5 Guarantee
9.6 Customer comments
10. Accessories
10.1 Scale card
10.2 Tag information
10.3 Alarms
10.3.1 Solid state output
10.3.2 Intrinsic safety
10.3.3 Summary of configuration
functions.
10.3.4 Alarm enable
10.3.5 Type of alarm
10.3.6 Setpoint adjustment
10.3.7 Alarm function
10.3.8 Alarm output status
10.3.9 Hysteresis
10.3.10 Alarm delay
10.3.11 Alarm silence time
10.3.12 Flash display when alarm
occurs.
10.3.13 Access setpoint
10.3.14 Adjusting alarm setpoints
from display mode.
10.4 Display backlight
10.5 4/20mA output
10.5.1 Intrinsic safety
10,5.2 System design
10.5.3 Configuration and calibration
10.5.4 Access 4/20mA output sub-menu
10.5.5 Enable 4/20mA output
10.5.6 Select rate or total source
10.5.7 Define display for 4mA output
10.5.8 Define display for 20mA output
Appendix 1 IECEx certification
Appendix 2 ETL & cETL certification
3

1. DESCRIPTION
This intrinsically safe, two input pulse counter will
accept pulses on one or both inputs and may be
configured to show one of the following in
engineering units on an eight digit display:
Input A + Input b
Input A - Input b
Input A direction controlled by Input b
Quadrature input
(Input A and Input b electrically 90oapart)
A smaller six digit display may be activated to show
the composite pulse rate in engineering units per
second, minute or per hour.
In addition to simple counting applications, the
quadrature input allows direction of movement and
position to be displayed.
The optically-isolated pulse output may be
configured to synchronously retransmit either of the
two inputs or a scaled composite output.
This instruction manual supplements the abbreviated
instruction sheet supplied with each instrument.
The BA368E has been certified intrinsically safe for
use in gas hazardous areas by Notified Body
Intertek Testing and Certification Ltd and complies
with the European ATEX Directive 2014/34/EU.
For international applications the BA368E also has
IECEx certification which is described in
Appendix 1.
For applications in the USA and Canada the BA368E
has ETL and cETL certification which is described in
Appendix 2.
2. OPERATION
Fig 1 shows a simplified block diagram of the
BA368E Counter. The instrument has two inputs, A
and b, which can be configured to accept pulses
from most types of sensor and display the total
number of pulses received and their combined rate
on separate displays.
Each input can be individually configured to accept
pulses from a wide variety of sensors. When the
sensor requires energising, such as a switch
contact, open collector or a two wire proximity
detector, an external link supplies power to the input
terminals.
The BA368E may be supplied with any of the
following factory fitted accessories:
Internally powered display backlight
Dual isolated alarms
Isolated 4/20mA output
Fig 1 BA368E block diagram
2.1 Initialisation
Each time power is applied to a BA368E Counter
initialisation is performed. After a short delay the
following display sequence occurs:
All segments of the display are activated
Counter starts functioning, using the
configuration information stored in the
instrument’s permanent memory. Unless total
and grand total displays have been reset to
zero, new pulses will be added to the existing
totals.
4

2.2 Controls
The BA368E Counter is controlled and configured
via four front panel push buttons. In the display
mode i.e. when the instrument is counting the push
button functions are:
Push Button Functions
) + &Grand total - shows Lo followed by least
significant 8 digits of the 16 digit grand
total.
) + * Grand total - shows Hi followed by the
most significant 8 digits of the 16 digit
grand total.
If Local Grand Total Reset CLr Gtot in
the instrument configuration menu has
been activated, operating the ) and
*buttons simultaneously for ten
seconds will result in Clr .no being
displayed with the no flashing.
Operating the *or &button will
change the display to Clr .YE5, the )
button will then reset the grand total to
zero which will be confirmed by a brief
display of Gt Clrd. See 6.25
& + *If Local Total Reset CLr tot in the
instrument configuration menu has
been activated, operating the & and
*buttons simultaneously for three
seconds will reset the total display to
zero and clear any pulses stored in the
pulse output.
See 6.24
(+ &Shows firmware version
( + )Access to configuration menu
Note: When optional alarms are fitted, the BA368E
Counter may be configured to provide direct access
to the alarm setpoints from the display mode when
the (and *buttons are operated simultaneously.
See 10.3.13 and 10.3.14
2.3 Displays
The BA368E Counter has two digital displays and
associated annunciators, plus a pulse input indicator
as shown on the front cover of this manual.
Total Shows the total pulse count on the
display upper eight digit display. May be
reset to zero via front panel push
buttons or by a remote reset switch.
Rate Shows the pulse rate on the lower six
Display digit display. Total and rate displays
may be reversed.
Pulse input This disc in the lower left hand corner
indicator of the display 'rotates' for two
seconds each time an input pulse is
received on either input. Appears to
rotate continuously when combined
input frequency on both inputs
exceeds 0.5Hz.
Reset Activated while the total display
annunciator is being reset via the front panel
push buttons, or the external reset
terminals.
Rate Identifies rate display
annunciator
Total Identifies total display
annunciator
RTx Retransmitted pulse
annunciator annunciator.
Depends upon the setting of 5ource
in the pulse output configuration
menu.
5caled:
Annunciator activated each time
pulse output open collector is on,
i.e. Ron is less than 60+ 3V.
direct:
Annunciator continuously
activated.
5

3. INTRINSIC SAFETY CERTIFICATION
The BA368E Counter has ATEX and IECEx gas
certification. This section of the instruction manual
describes ATEX gas certification. IECEx and other
approvals are each described in separate
appendixes to this manual.
3.1 ATEX gas certification
Notified Body Intertek Testing and Certification Ltd
have issued the BA368E with an EC-Type
Examination Certificate number ITS16ATEX28408X.
This confirms compliance with harmonised
European standards and it has been used to confirm
compliance with the European ATEX Directive for
Group II, Category 1G equipment. The Counter
carries 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 section of the instruction manual describes
ATEX installations in explosive gas atmospheres
conforming with EN60079-14 Electrical Installations
in Hazardous Areas. When designing systems for
installation outside the UK the local Code of Practice
should be consulted.
3.2 Zones, gas groups and T rating
The BA368E Counter has been certified
Ex ia IIC T5 Ga -40ºC Ta +70ºC. When
connected to a suitable system it 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 450°C
T2 300°C
T3 200°C
T4 135°C
T5 100°C
At ambient temperatures between -40 and +70°C.
The specified operating temperature of the BA368E
Counter is -40 to +70°C. At temperatures below -
20°C the instrument will continue to count, but the
display digits will change increasingly slowly and the
contrast will be reduced.
This allows the BA368E Counter to be installed in all
gas Zones and to be used with most common
industrial gases except carbon disulphide and ethyl
nitrite which have an ignition temperature of 95°C.
3.3 Special conditions for safe use
The ATEX certificate has an ‘X’ suffix indicating that
special conditions apply to prevent an electrostatic
charge developing on the outside of the instrument
enclosure.
WARNING
To avoid an electrostatic charge being
generated instrument enclosure should
only be cleaned with a damp cloth.
3.4 Power supply
When installed in a hazardous area the BA368E
Counter should be powered via a certified Zener
barrier or galvanic isolator from a dc supply located
in the safe area, or from associated apparatus with
an intrinsically safe output.
The input safety parameters of terminals 1 and 2
are:
Ui = 28V dc
Ii = 200mA dc
Pi = 0.84W
Any certified Zener barrier or galvanic isolator with
output safety parameters equal to or less than these
limits may be used.
The maximum equivalent capacitance and
inductance between terminals 1 and 2 is:
Ci = 2nF
Li = 4µH
To determine the maximum permissible cable
parameters the above figures, which are small and
may be ignored in many applications, should be
subtracted from the maximum permitted cable
parameters specified for the Zener barrier or
galvanic isolator powering the BA368E Counter.
6

3.5 Pulse input terminals
The BA368E Counter has two pulse inputs, A and b,
that may be individually configured for use with most
types of sensor. Each input is a separate
intrinsically safe circuit, although the negative side of
each input is internally connected to the negative
side of the power supply and reset terminal RS2.
See Fig 1. The two inputs should not be connected
in parallel.
Some types of sensor that may be connected to the
BA368E inputs, such as a switch contact or a 2-wire
proximity detector, require energising to determine
their state. For sensors requiring energising fitting
an external link between terminals 3 & 4 of the
BA368E for input A and between terminals 7 & 8 for
input b, connects an internal 7V, 6mA supply to the
respective input. Energising is not required when a
BA368E input is connected to a voltage source.
Fitting an energising link changes the output safety
parameters of each BA368E input as shown in the
following table which also shows the types of sensor
requiring energising (link fitting).
Output safety
parameters of each
input.
Type of input Link* Uo Io Po
Switch contact Yes 10.5V 9.2mA 24mW
Proximity detector Yes 10.5V 9.2mA 24mW
Open collector Yes 10.5V 9.2mA 24mW
Magnetic pick-off No 1.1V 0.5mA 0.2mW
Voltage input (low) No 1.1V 0.5mA 0.2mW
Voltage input (high) No 1.1V 0.5mA 0.2mW
*For input A link terminals 3 and 4
*For input b link terminals 7 and 8
3.5.1 sensors that do not require energising
Magnetic pick-offs and voltage pulse inputs do not
require energising, see section 3.5. For intrinsic
safety purposes, sources of energy with output
parameters less than 1.5V; 100mA and 25mW are
considered to be simple apparatus (Clause 5.7 of
EN60079-11), which allows them to be ignored and
not documented when assessing an intrinsic safe
system.
When terminals 3 & 4 and terminals 7 & 8 are not
linked, the associated BA368E Counter input
complies with the requirements for simple
apparatus. This allows the output parameters of the
pulse input to be ignored when assessing the safety
of the sensor connected to a Counter.
This allows almost any certified intrinsically safe
voltage pulse or certified magnetic pick-off to be
directly connected to one of the BA368E Counter
inputs.
The BA368E EC-Type Examination Certificate
specifies that the equivalent capacitance and
inductance of each BA368E Counter input are:
Ci = 2nF
Li = 4H
To determine the maximum permissible cable
parameters these figures should be subtracted from
the maximum permitted cable parameters specified
for the sensor connected to the input terminals of the
Counter. However, the Counter input parameters
are very small and they are unlikely to make any
significant difference to the allowable cable
parameters.
3.5.2 sensors that require energising
Switch contacts, proximity detectors and open
collector inputs require energising as described in
section 3.5. When energised, the output parameters
of each BA368E Counter input are:
Uo = 10.5V
Io = 9.2mA
Po = 24mW
These parameters do not comply with the
requirements for simple apparatus and should be
included when assessing the safety of the circuits
connected to the inputs of the BA368E Counter.
Any certified intrinsically safe sensor or simple
apparatus may be connected to an energised
BA368E Counter input providing that the sensor's
input parameters are equal to, or greater than, the
output safety parameters of the BA368E Counter
input which are shown above. This is not restrictive
and most sensors will comply.
This allows most mechanically operated switch
contacts, open collector transistors and certified
intrinsically safe NAMUR proximity detectors to be
directly connected to a BA368E Counter input
providing the sensor and associated wiring can
withstand a 500V rms insulation test to earth and
both are located within the same hazardous area as
the Counter.
The maximum capacitance and inductance that may
be safely connected to each Counter input when
energised (link connected) is:
Co = 2.4µF
Lo = 200mH
Again this is not restrictive and most sensors will
comply.
7

3.6 Remote reset terminals
The BA368E Counter may be reset to zero by
connecting the reset terminals RS1 and RS2
together for more than one second. These two
terminals have the following input and output safety
parameters:
Uo = 3.8V
Io = 1mA
Po = 1mW
Ui = 28V dc
Ii = 200mA dc
Pi = 0.84W
The equivalent capacitance and inductance between
them is:
Ci = 0nF
Li = 0H
The maximum capacitance and inductance that may
be safely connected between the reset terminals
RS1 and RS2 is:
Co = 40µF
Lo = 1H
The total Counter display may be reset to zero from
within the hazardous area by any mechanically
operated switch contact connected directly to
terminals RS1 and RS2. 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 polarity Zener barrier may
also be used as shown in Fig 2.
Alternatively, the BA368E Counter may be
configured so that the total display is reset to zero
when the &and *push buttons are operated
simultaneously for more than three seconds.
See 6.24.
3.7 Certification label information
The certification information label is fitted in a recess
on the top outer surface of the enclosure. It shows
the ATEX and IECEx certification information, plus
BEKA associates name and location and the
instrument serial number. Non European
certification information may also be included.
BA368E Certification information label
8

4. SYSTEM DESIGN FOR HAZARDOUS AREAS
4.1 Use with Zener barriers
Zener barriers are the least expensive intrinsically
safe interface between a safe and hazardous area.
However they require a high integrity earth
connection that may be expensive to install and they
do not provide isolation. When a high integrity earth
connection is not already available, it may be less
expensive and complicated to use galvanic isolators
for the installation of a single BA368E Counter.
Terminals 2, 6, 10 and RS2 of the BA368E Counter
are internally connected together. If any of these
terminals are earthed, as shown in Figs 2 & 3, the
other terminals should only be connected to the
same earth, i.e. the barrier busbar, or to circuits that
have 500V insulation to earth.
Any certified Zener barriers may be used with the
BA368E Counter 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
in each Counter system.
Fig 2 illustrates the basic circuit that is used for all
BA368E Counter installations protected by Zener
barriers. For simplicity, connections for the pulse
output and the optional alarms and 4/20mA output
are shown separately in sections 7 and 10 of this
manual.
Fig 2 BA368E used with Zener barriers
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 Counter 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.
When designing a system it is important to
remember that terminals 2, 6, 10 and RS2 are
interconnected within the BA368E See Fig 1.
Fig 3 BA368E used with Zener barriers
pulse source in safe area.
4.1.1 Power supply
The BA368E Counter requires a minimum of 10V
between terminal 1 & 2 and consumes:
10mA without optional backlight
plus 16mA for optional backlight
plus 6mA when terminals 3 & 4 are linked
plus 6mA when terminals 7 & 8 are linked
Any certified Zener barrier may be used to power a
BA368E Counter providing the output safety
parameters of the barrier are equal to or less than
the input safety parameters of terminals 1 & 2 of the
BA368E Counter.
Although this allows a wide variety of barriers to be
used, a positive polarity 28V; 93mA; 300Zener
barrier, which has an end-to-end resistance of about
340, is an industry standard device which is
frequently used. With this barrier the supply voltage
in the safe area, with both counter inputs energised,
must be between 17.5V and the maximum working
voltage of the Zener barrier which, depending upon
manufacturer, will be approximately 26V. The
minimum voltage increases to 23V if a display
backlight is fitted.
9

4.1.2 Pulse input
As shown in Fig 2 the BA368E can count pulses
from a wide variety of sensors in the hazardous
area, or from the safe area as shown in Fig 3.
No Zener barrier is required in series with each input
if the intrinsically safe pulse source is located within
the same hazardous area as the BA368E Counter.
The following table shows the switching thresholds
for the various types of sensor. For reliable
counting the pulse input must fall below the lower
threshold and rise above the upper threshold.
Input sensor
Switching thresholds
Lower Upper
Switch 1001000
Proximity detector 1.2mA 2.1mA
Open collector 2k10k
Magnetic pick-off 0mV 40mV peak
Voltage pulse low 1.0V 3.0V
Voltage pulse high 3.0V 10.0V
4.1.3 Switch contact input
Any mechanically activated switch contact located in
the same hazardous area as the BA368E Counter
may be directly connected to the pulse input
terminals 5 & 6 and 9 & 10 providing the switch and
associated wiring can withstand a 500V rms
insulation test to earth. Most magnetically activated
reed relays comply with these requirements. The
BA368E contains a configurable debounce circuit to
prevent contact bounce being counted.
See section 6.6 for details of the maximum counting
frequency.
4.1.4 2-wire proximity detector input
Most certified intrinsically safe 2-wire proximity
detectors complying with NAMUR switching
thresholds may be connected to the BA368E
Counter inputs, providing the input safety
parameters of the proximity detector are equal to or
greater than the output safety parameters of the
Counter inputs i.e.
Ui ≥10.5V dc
Ii ≥9.2mA dc
Pi ≥24mW
and the minimum operating voltage of the proximity
detector is less than 7.5V.
See section 6.6 for details of the maximum counting
frequency.
4.1.5 Open collector input
Most open collector sensors located in the same
hazardous area as the BA368E Counter may be
directly connected to pulse input terminals 5 & 6 and
9 & 10 providing the sensor and associated wiring
can withstand a 500V rms insulation test to earth.
The open collector device must comply with the
requirements for simple apparatus or have input
safety parameters equal to or greater than:
Ui ≥10.5V dc
Ii ≥9.2mA dc
Pi ≥24mW
See section 6.6 for details of the maximum counting
frequency.
4.1.6 Magnetic pick-off input
CoiL in the input configuration menu is a low level
voltage pulse input intended for use with magnetic
pick-off sensors producing an ac output. For a CoiL
input the pulse input terminals 5 & 6 and 9 & 10 of
the BA368E Counter comply with the requirements
of simple apparatus allowing connection to any
certified intrinsically safe magnetic pick-off within the
hazardous area having output parameters equal to
or less than:
Uo 28V dc
Io 200mA dc
Po 0.84W
The maximum permitted cable parameters will be
defined by the magnetic pick-off’s intrinsic safety
certificate less the Counters input parameters Ci & Li
which are small and can often be ignored,
See section 6.6 for details of the maximum counting
frequency.
4.1.7 Voltage pulse input
Two voltage pulse input ranges are selectable in the
configuration menu, VoLt5 L and VoLt5 H. When
configured for either of the voltage pulse ranges, the
pulse input terminals 5 & 6 and 9 & 10 of the
BA368E Counter comply with the requirements of
simple apparatus allowing connection to any
intrinsically safe voltage source within the hazardous
area having output parameters equal to or less than:
Uo 28V dc
Io 200mA dc
Po 0.84W
The maximum permitted cable parameters will be
defined by the voltage source intrinsic safety
certificate less the BA368E Counter input
parameters which are small and can often be
ignored.
See section 6.6 for details of the maximum counting
frequency.
10