BEKA BA368C User manual

Issue: Issue 11
3rd November 2009
Certification
information
label
Display
Pulse input
indicator Annunciators for
optional alarms or
control outputs
Selectable
second
display
BA368C
Intrinsically safe
externally powered
panel mounting
counter, timer, tachometer
and clock
issue 11

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1. Common features
1.1 Structure of instruction manual
1.2 Operation
1.2.1 Counter
1.2.2 Timer
1.2.3 Tachometer
1.2.4 Clock
1.3 Initialisation
1.4 Intrinsic safety certification
1.4.1 ATEX certification
1.4.2 Power supply
1.4.3 Pulse input terminals
1.4.4 Remote reset terminals
1.4.5 Zones, gas groups & T rating
1.4.6 Certification label information
1.5 Installation
1.5.1 Location
1.5.2 Installation procedure
1.5.3 EMC
1.6 Programming
1.6.1 Security override link
1.7 Servicing
1.7.1 Routine maintenance
1.7.2 Guarantee
1.8 Customer comments
1.9 Accessories
1.9.1 Scale card
1.9.2 Tag number
1.9.3 Optional control outputs / alarm
outputs
1.9.3.1 Solid state output
1.9.3.2 Intrinsic safety
1.9.4 Optional pulse output
1.9.4.1 Intrinsic safety
1.9.5 Optional 4/20mA output
1.9.5.1 Intrinsic safety
1.9.6 Optional display backlight
Appendix 1 FM Approval for use in the USA
2. Use as a Counter
3. Use as a Timer
4. Use as a Tachometer
5. Use as a Clock
CONTENTS
The BA368C is CE marked to show compliance with the European Explosive Atmospheres Directive
94/9/EC and the European EMC Directive 2004/108/EC
Please read section 1 plus the section describing the function
that you wish to use.

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1 COMMON FEATURES
The BA368C is a multifunction intrinsically safe
panel-mounting instrument that may be
programmed on-site as a counter, timer,
tachometer or as a clock. The instrument has
been certified intrinsically safe by European
Notified Body Intertek Testing Sevices (ITS) to the
ATEX Directive 94/9/EC allowing installation in
most hazardous areas.
For use in the USA the BA368C has FM intrinsic
safety and nonincendive approval – see Appendix
1.
Housed in a robust 72 x 144 panel-mounting DIN
enclosure, the BA368C has an IP65 front panel
and is supplied with a gasket to seal the joint
between the instrument and the panel.
1.1 STRUCTURE OF INSTRUCTION MANUAL
This instruction manual is divided into five
sections. The first covers the common features
of the instrument. The remaining are self
contained sections each describing one of the
BA368C functions.
1. Common features of the instrument
including installation, intrinsic
safety and accessories.
2. Use as a counter
3. Use as a timer
4. Use as a tachometer
5. Use as a clock
1.2 OPERATION
Fig 1.1 shows a simplified block diagram of the
BA368C. The instrument may be programmed on-
site as a counter, timer, tachometer or as a clock.
The two inputs may be individually configured to
accept voltage, contact, open collector or 2-wire
proximity detector inputs. Accessories include a
pulse output, 4/20mA analogue output and two
solid state control outputs.
Fig 1.1 Simplified block diagram of BA368C
1.2.1 Counter
When configured as a counter the BA368C will
accept pulses on one or both inputs and may be
programmed to display:
Input A +Input B
Input A -Input B
Input A, direction controlled by input B
Input A and Input B quadrature input
(for position sensing)
Optional alarms, a pulse output and an analogue
4/20mA output are available
See section 2 of this manual for a detailed
description of counter functions.
1.2.2 Timer
The timer functions may be started and stopped
from input A alone, inputs A and B, or from the
front panel pushbuttons. Elapsed or remaining time
may be displayed in hh:mm or hh:mm:ss format.
The instrument will normally be supplied with two
optional solid state control outputs.
See section 3 of this manual for a detailed
description of the timer functions.
1.2.3 Tachometer
When programmed as a tachometer the BA368C
has one input which may be conditioned to operate
with most types of pulse output transducer. The
instrument will display rotational speed per second,
minute or hour, or linear speed in engineering
units. To assist with routine maintenance, a run-
time counter records the number of hours the
monitored machinery has been operating. Optional
alarms and an analogue 4/20mA output are
available.
See section 4 of this manual for a detailed
description of the tachometer functions.
Please read section 1
plus the section
describing the function
that you wish to use.

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1.2.4 Clock
When programmed as a digital clock the BA368C
will display local time within a hazardous area.
The two optional solid state control outputs may be
programmed to turn on and off twice during each
24 hour period.
See section 5 of this manual for a detailed
description of the clock functions.
1.3 INITIALISATION
Each time power is applied to the BA368C
initialisation 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 and versionnumber
are shown on the top display and the current
instrument function i.e. Countr, ELAPSE,
tACHO or CLOC are displayed on the lower
display for 2 seconds.
The BA368C starts to function using the
calibration information stored in the
permanent memory.
1.4 INTRINSIC SAFETY CERTIFICATION
1.4.1 ATEX certification
The BA368C has been issued with EC-Type
Examination Certificate number ITS01ATEX2004
by Notified Body Intertek Testing Services (ITS)
confirming compliance with the European ATEX
Directive 94/9/EC for Group II, Category 1, gas
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. i.e.
Austria, Belgium, Denmark, Finland, France,
Germany, Greece, Ireland, Italy, Luxembourg, The
Netherlands, Norway, Portugal, Spain, Sweden
and the United Kingdom. ATEX certificates are
also accepted in Iceland, Liechtenstein,
Switzerland and the Czech Republic.
This manual describes installations which conform
with BS EN60079:Part14 Electrical Installation in
Hazardous Areas. When designing systems for
installation outside the UK, the local Code of
Practice should be consulted.
1.4.2 Power supply
When installed in a hazardous area the BA368C
must be powered via a Zener barrier or galvanic
isolator from a dc supply located in the safe area.
The input safety parameter for 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. 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
When installing a system not covered by the
BA368C system certificates, these figures must be
subtracted from the maximum cable parameters
for the certified device powering the BA368C.
1.4.3 Pulse input terminals
The BA368C has two identical inputs designated A
(terminals 3 & 4), and B (terminals 5 & 6). Each
may be connected to a switch, open collector or
certified intrinsically safe 2-wire proximity detector.
The safety parameters of each input are:
Ui = 28V dc
Ii = 100mA dc
Pi = 0.7W
Uo = 10.5V dc
Io = 9.2mA dc
Po = 24mW
Note: when programmed as a tachometer only
one input may be used and when programmed as
a clock neither of the inputs are available.
Hazardous area mechanically operated switches
comply with the requirements for simple apparatus
and may be directly connected to either input.
Similarly, optically isolated open collector outputs
that comply with the requirements for simple
apparatus may also be directly connected to either
input.
The BA368C system certificates specify some of
the intrinsically safe 2-wire proximity detectors that
may be connected directly to the two instrument
inputs. Other certified intrinsically safe detectors
may be used providing that the input safety
parameters of the detector are less than the
BA368C output parameters.

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Voltage pulses may be connected to one or both
inputs. They must be from a certified intrinsically
safe source within the hazardous area, or
connected via a Zener barrier or galvanic isolator
from any safe area pulse source. The output
parameters of the barrier or isolator must be less
than the BA368C input parameters.
To comply with certification requirements, all
transducers and associated field wiring connected
to the BA368C input terminals must be able to
withstand an ac test voltage of 500V rms to earth
or frame of the apparatus for one minute. The
maximum equivalent capacitance and inductance
between the pulse input terminals 3 & 4 and 5 & 6
is:
Ci = 20nF
Li = 20µH
When installing systems not covered by the
BA368C system certificates, these figures must be
subtracted from the maximum cable parameters
for the certified device connected to the BA368C
input.
1.4.4 Remote reset terminals
When programmed as a counter, timer or clock the
BA368C display can be reset or synchronised by
connecting terminals 7 and 8 together for more
than one second. These terminals have the
following input and output safety parameters:
Ui = 28V dc
Ii = 100mA dc
Pi = 0.7W
Uo = 3.8V dc
Io = 1.7mA dc
Po = 2.0mW
The display may be reset from within the
hazardous area by any mechanically operated
switch connected directly to terminals 7 & 8.
To reset the 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. The system certificates list
suitable devices and define the maximum cable
parameters.
1.4.5 Zones, gas groups and T rating
The BA368C has been certified compliant with the
requirements for Group II, Category 1 G, EEx ia
IIC T5 (Tamb –40 to 60oC) equipment specified by
the ATEX Directive. When connected to a suitable
system the BA368C 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 an ambient temperature between –40 and
+60oC.
Note: the guaranteed operating temperature
range is –20 to +60oC
1.4.6 Certification label Information
The certification label is fitted in a recess on the
top of the enclosure.
WARNING installation in Zone 0
When installed in a Zone 0 potentially
explosive atmosphere requiring apparatus
of Category 1G, the instrument shall be
installed such that even in the event of rare
incidents, an ignition source due to impact
or friction between the aluminium enclosure
at the rear of the instrument mounting panel
and iron/steel is excluded.

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1.5 INSTALLATION
1.5.1 Location
The BA368C is housed in a robust aluminium
enclosure with a polyester membrane front panel
surrounded by a Noryl bezel. The front of the
instrument provides IP65 protection and a
neoprene gasket seals the joint between the
instrument enclosure and the panel. The
instrument may be installed in any panel providing
the environmental limits shown in the specification
are not exceeded.
Fig 1.2 shows the overall dimensions of the
BA368C and the panel cut-out. To achieve an
IP65 seal between the instrument enclosure and
the panel the smaller cut-out must be used and the
instrument secured with four panel mounting clips.
The BA368C liquid crystal display has maximum
contrast when viewed from directly ahead and
slightly below the centre line of the instrument. For
reflective displays there is little degradation when
viewed from above the centre line, but slight
degradation may be noticeable when the
instrument is fitted with a backlight.
Fig 1.2 BA368C dimensions
1.5.2 Installation Procedure
a. Insert the BA368C into the instrument panel
cut-out from the front of the panel.
b. Fix panel mounting clips to opposite sides of
the instrument and tighten until the
instrument is secure as shown in Fig 1.3.
Four clips are required to achieve an IP65
seal between the instrument enclosure and
the panel.
c. Connect the panel wiring to the rear terminal
block(s) as shown in Fig 1.3 To simplify
installation, the terminals are removable so
that panel wiring can be completed before
the instrument is installed.
Fig 1.3 Installation and terminal connections

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1.5.3 EMC
The BA368C 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.
To prevent circulating currents, cable screens
should only be earthed at one point in the safe
area.
1.6 PROGRAMMING
Detailed programming information is contained in
each of the four function sections of this instruction
manual.
1.6.1 Security override link
To prevent accidental adjustment, or tampering,
access to the programme menus may be protected
by a four digit security code. 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 terminal block(s) by gently pulling.
Remove the six screws securing the rear panel
and lift off the panel which will reveal the link – see
Fig 1.4
Fig 1.4 Location of security override link
1.7 SERVICING
A fault finding guide is contained in each section of
this manual. If this does not reveal the cause of
the problem, our sales department will be pleased
to help you. Faulty BA368C instruments should be
returned to BEKA associates, or to our agent in
your area, for repair.
1.7.1 Routine maintenance
The mechanical condition of the instrument should
be regularly checked. The interval between
inspections depends upon environmental
conditions. We recommend that initially
instruments should be inspected annually.
1.7.2 Guarantee
Instruments which fail within the guarantee period
should be returned to BEKA associates or our local
agent. It is helpful if a brief description of the fault
symptoms is provided.
1.8 CUSTOMER COMMENTS
BEKA associates is always pleased to receive
comments from customers about our products and
services. All communications are acknowledged
and whenever possible, suggestions are
implemented.

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1.9 ACCESSORIES
1.9.1 Scale card
The BA368C has a window on the right hand side
of the display to hold a card showing the units of
measurements e.g. Litres, seconds, rpm.
Instruments can be supplied with a printed scale
card showing any units specified at the time of
ordering. If a printed card is not requested, a blank
card will be supplied.
Scale cards can easily be marked on-site as
follows:
a. Remove the rear terminal block(s) and the
rear panel as shown in Fig 1.4
b. Carefully pull the instrument assembly from
the enclosure.
c. Gently pull and then slide the blank scale
card towards the display window until the
card is free. Mark the card with the required
legend and replace in the slot.
d. Reassemble the instrument.
1.9.2 Tag number
The BA338C can be supplied with a thermally
printed tag number on the rear panel. This tag
number is not visible from the front of the
instrument after installation.
1.9.3 Optional control outputs / alarm outputs
The BA368C can be supplied with two
programmable solid state single pole outputs. The
function of these outputs depends upon how the
BA368C has been programmed i.e. as a counter,
timer, tachometer or a clock. Full programming
information is contained in each section of this
manual
WARNING
These control outputs should not be
used for critical safety applications such
as an emergency shut down system.
When the BA368C power supply is
turned off or disconnected, both control
outputs will open irrespective of how
they have been programmed.
Annunciators on the instrument display indicate the
status of both control outputs.
1.9.3.1 Solid state output
Each output is a galvanically isolated single pole
solid state switch as shown in Fig 1.5. The outputs
are polarised and current will only flow in one
direction. Terminals A1 and A3 should be
connected to the positive side of the supply.
Ron = 5Ω+ 0.6V
Roff = greater than 180k
Note: Because of the series protection diode
some test meters may not detect a closed
control output.
Fig 1.5 Equivalent circuit of each control output
1.9.3.2 Intrinsic safety
Both control outputs comply with the requirements
for simple apparatus specified in Clause 5.5 of
EN50020:1994. This allows them to be connected
to any intrinsically safe circuit protected by a
certified Zener barrier or galvanic isolator providing
that the output parameters of each circuit do not
exceed:
Uo = 28Vc
Io = 200mA dc
Po = 0.85W
No system certificate has been issued for the
BA368C switch contact outputs, as the system
certificate for the circuit to which the alarms are
connected remains valid.
The maximum equivalent capacitance and
inductance of each BA368C control output is:
Ci = 40nF
Li = 30µH
To determine the maximum permissible cable
parameters, the equivalent output parameters
must be subtracted from the maximum cable
capacitance and inductance specified by the
system certificate of the circuit connected to each
control output.

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1.9.4 Optional pulse output
The BA368C can be supplied with an isolated solid
state pulse output for use when the instrument is
programmed as a counter. Section 2 of the
manual explains the use and programming of this
option
1.9.4.1 Intrinsic safety
The pulse output is an optically isolated separate
intrinsically safe circuit that has zero output safety
parameters and therefore complies with the
requirements for simple apparatus. This allows
terminals P1 and P2 to be connected to any
intrinsically safe circuit protected by a certified
Zener barrier or galvanic isolator providing with
output parameters not exceeding:
Uo = 28V
Io = 100mA dc
Po = 0.7W
The maximum equivalent capacitance and
inductance of the BA368C pulse output is:
Ci = 20nF
Li = 20µH
To determine the maximum permissible cable
parameters, these figures must be subtracted from
the maximum permitted cable capacitance and
inductance specified by the system certificate of
the circuit connected to the BA368C – usually a
Zener barrier or galvanic isolator.
1.9.5 Optional 4/20mA output
The BA368C can be supplied with an optically
isolated 4/20mA current sink which may be used
when the instrument is programmed as a counter
or as a tachometer. When the BA368C is
programmed as a counter, the 4/20mA output may
be proportional to pulse input rate or the total
number of pulses. When programmed as a
tachometer the current is proportional to rotational
speed.
Note: The 4/20mA current output is not available
when the BA368C is programmed as a timer or as
a clock.
1.9.5.1 Intrinsic safety
The 4/20mA output is an optically isolated
separate intrinsically safe circuit which has zero
output safety parameters and therefore complies
with the requirements for simple apparatus. This
allows terminals C1 and C2 to be connected to any
intrinsically safe circuit protected by a certified
Zener barrier or galvanic isolator providing the
output parameters do not exceed:
Uo = 28V
Io = 100mA
Po = 0.7W
The maximum equivalent capacitance and
inductance of the optional 4/20mA output at the
terminals is:
Ci = 2nF
Li = 8µH
To determine the maximum permissible cable
parameters, these figures must be subtracted from
the maximum cable capacitance and inductance
specified by the system certificate of the circuit
connected to the BA368C 4/20mA output – usually
a Zener barrier or galvanic isolator.

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1.9.6 Optional display backlight
The BA368C can be supplied with LED
backlighting to improve display contrast when the
instrument is installed in a poorly illuminated area.
The backlight is segregated from the measuring
circuit and has been certified as a separate
intrinsically safe circuit. System certificates for use
with Zener barriers and galvanic isolators have
therefore been issued.
The backlight must be powered from the safe area
via a Zener barrier or a galvanic isolator as shown
in Fig 1.6. Any certified Zener barrier may be
used providing the output parameters do not
exceed:
Uo = 28V
Io = 159mA
Po = 0.8W
The system certificate lists some of the galvanic
isolators which may be used.
The maximum equivalent capacitance and
inductance at the backlight terminals is:
Ci = 40nF
Li = 30µH
To determine the maximum permissible cable
parameters, these figures should be subtracted
from the maximum cable capacitance and
inductance specified by the barrier or galvanic
isolator powering the backlight. The system
certificates specify maximum cable parameters for
some devices.
Fig 1.6 Backlight powered by Zener barrier

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Appendix 1
FM approval for use in USA
A1.0 Factory Mutual Approval
For installations in the USA, the BA368C and
accessories have been approved intrinsically safe
and nonincendive by FM Approvals, project
identification 3022309. Copies of the Certificate of
Compliance are available from the BEKA
associates sales office and from the BEKA web
site www.beka.co.uk.
A1.1 Intrinsic safey approval
The BA368C is approved to the FM Class 3610
intrinsic safety standard. Installations must comply
with BEKA associates Control Drawing CI330-33,
which is attached to this Appendix, ANSI/ISA
RP12.06.01 ‘Installation of Intrinsically Safe
Systems for Hazardous (Classified) Locations’ and
with the National Electrical Code ANSI/NFPA70.
The BA368C has a T4 rating at ambient
temperatures up to +60°C and may be used with
the following gases:
Intrinsic Safety
Division 1 or 2
Class I Group A & B
Group C
Group D
Zone 0, 1 or 2
Class 1 Group IIC
Group IIB
Group IIA
The FM entity parameters are similar to the ATEX
parameters. The intrinsically safe circuits shown in
this manual may therefore be used for installations
in the USA, providing the Zener barriers and
galvanic isolators are FM Approved and comply
with BEKA associates Control Drawing CI330-33.
A1.2 Nonincendive approval
The BA368C is Class 3611 nonincendive approved
by Factory Mutual allowing it to be installed in
Division 2 Classified Areas without the need for
Zener barriers or galvanic isolators. Installations
must comply with the BEKA associates Control
Drawing CI330-35, which is attached to this
Appendix, and with the National Electrical Code
ANSI/NFPA70.
The BA368C has a T4 rating at ambient
temperatures up to +60°C and may be used with
the following gases:
Nonincendive
Division 2
Class I Group A & B
Group C
Group D
Zone 2
Class I Group IIC
Group IIB
Group IIA

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