BEKA BA364ND User manual

Issue: 6
4th March 2014
BA364ND
Type nL certified
externally powered
field mounting
counter, timer,
tachometer and clock
Issue 6

2
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 Ex nL certification
1.4.1 Certificate of Conformity
1.4.2 ATEX certification
1.4.3 Power supply
1.4.4 Pulse input terminals
1.4.5 Remote reset terminals
1.4.6 Zones, gas groups and T rating
1.4.7 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 Units of measurement and
instrument identification.
1.9.2 Pipe mounting kits
1.9.3 Stem mounting kit
1.9.4 Optional external push-buttons
1.9.5 Optional control outputs / alarm
outputs
1.9.5.1 Solid state output
1.9.5.2 Ex nL certification
1.9.6 Optional pulse output
1.9.6.1 Ex nL certification
1.9.7 Optional 4/20mA output
1.9.7.1 Ex nL certification
1.9.8 Optional display backlight
2. Use as a Counter
3. Use as a Timer
4. Use as a Tachometer
5. Use as a Clock
CONTENTS
The BA364ND is CE marked to show compliance with the European Explosive Atmospheres
Directive
94/9/EC and the European EMC Directive 2004/108EC
Please read section 1 plus the section describing the function
that you wish to use.

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1 COMMON FEATURES
The BA364ND is a multifunction Ex nL certified,
field mounting instrument that may be
programmed on-site as a counter, timer,
tachometer or as a clock.
The BA364ND has been issued with a Certificate
of Conformity to BS50021:1999. Type of
protection ‘n’ by Intertek Testing Sevices (ITS).
In addition, the BA364ND complies with the
European ATEX Directive 94/9/EC for Group II,
Category 3G equipment and has been issued
with an Declaration of Conformity N0013.
Housed in a robust IP66 glass reinforced
polyester (GRP) enclosure with an armoured
glass window, the BA364ND is surface mounting,
or may be pipe mounting using one of the
accessory kits described in section 1.9.2
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
BA364ND functions.
1. Common features of the instrument
including installation, Ex nL
certification 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
BA364ND. 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 BA364ND
1.2.1 Counter
When configured as a counter the BA364ND 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 B quadrature input
(for position sensing)
An optional pulse output, 4/20mA analogue
output and alarm contacts are available.
See section 2 of this manual for a detailed
description of the 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 time may be
displayed in hh:mm or hh:mm:ss format. The
instrument will normally be ordered 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
BA364ND 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
BA364ND will display local time within a Zone 2
hazardous area. The two optional solid state
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 BA364ND
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 BA364ND starts to function using the
calibration information stored in the
permanent memory.
1.4 Ex nL CERTIFICATION
1.4.1 Certificate of Conformity
ITS Testing and Certification Ltd. (Formerly ERA
Technology Ltd) have issued a Certificate of
Conformity Ex01Y4015 confirming that the
BA364ND complies with the CENELEC standard.
The L suffix indicates that the Type n certified
equipment uses an energy limiting technique
based on the philosophy of intrinsic safety.
1.4.2 ATEX certification
The BA364ND complies with the European ATEX
Directive 94/9/EC for Group II, Category 3G
equipment. It has been assessed using the
‘Internal Control of Production’ procedure
specified in Annex 8 of the Directive. A technical
dossier has been prepared and an EC
Declaration of Conformity number
BEKA01ATEX0013 has been issued.
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 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.
1.4.3 Power supply
The BA364ND certificate specifies the maximum
input parameters for the power supply terminals 7
and 8.
Ui = 30V dc
Ii = 100mA dc
When installed in Zone 2 the BA364ND must be
powered from a supply with an output between
10 to 30V dc.
1.4.4 Pulse input terminals
The BA364ND has two identical inputs
designated A (terminals 3 & 4) and B (terminals
5 & 6). Each may be connected to a voltage
pulse, switch, open collector or 2-wire proximity
detector. The safety parameters of each input
are:
Ui = 30V dc
Ii = 100mA dc
Note: when programmed as a tachometer only
one input may be used and when programmed
as a clock neither of the inputs are available.
Both sets of input terminals may therefore be
connected to any voltage source providing that in
normal operation it does not exceed 30V.
Alternatively the inputs may be connected to a
switch contact or a 2-wire NAMUR proximity
detector. These do not contain a source of
voltage and therefore there are no limits,
although if installed in Zone 2 the proximity
detector should have Ex n approval.
1.4.5 Remote reset terminals
When programmed as a counter, timer or clock
the BA364ND display can be reset or
synchronised by connecting terminals 7 and 8
together for more than one second. These
terminals have the following input safety
parameters:
Ui = 30V dc
Ii = 100mA dc
These terminals are intended for connection to a
switch contact in the safe or Zone 2 hazardous
area, so normally input parameters do not have
to be considered.

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1.4.6 Zones, gas groups and T rating
The BA364ND has been certified as Group II,
Category 3 G apparatus as defined in the ATEX
Directive and as Ex nL T5, Tamb –20 to 60oC.
‘L’ indicates that the BA364ND uses energy-
limiting techniques to achieve compliance as
defined in EN 60079-15. This technique is based
on the philosophy of intrinsic safety which limits
the current and voltage applied to components
which may generate a spark in normal operation.
e.g. switches and potentiometers.
These approvals confirm that the BA364ND is
safe in normal operation and may be installed in:
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 –20 and
+60oC.
This allows the BA364ND to be installed in Zone
2 hazardous areas (low risk) and to be used with
most common industrial gases.
1.4.7 Certification label Information
The certification label is fitted in a recess on the
top of the enclosure. It shows the ATEX
certification information, BEKA associates name
and web site address. The instrument serial
number and date of manufacture are recorded on
a separate label inside the terminal compartment

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1.5 INSTALLATION
1.5.1 Location
The BA364ND 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 offshore and waste water treatment
installations. Please consult BEKA associates if
high vibration is anticipated.
The BA364ND enclosure is surface mounting.
Accessory kits described in sections 1.9.2 & 1.9.3
of this manual enable the instrument to be
mounted onto a vertical or horizontal pipe.
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 BA364ND earth terminal is connected to the
internal EMC filters. To achieve the stated 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 BA364ND enclosure is supplied with a
bonding plate to ensure electrical continuity
between the three conduit / cable entries.
1.5.2 Installation Procedure
Fig 1.2 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 sections 1.9.2
and 1.9.3
c. Remove the temporary hole plug and
install an Ex n or Ex e cable gland or
conduit entry. If more than one entry is
required, replace one or both Ex e
stopping plugs with an Ex n or Ex e cable
gland or conduit entry.
Note: the temporary dust seals fitted to the
instrument before despatch do not comply
or provide IP66 protection.
d. Connect the field wiring to the terminals as
shown in Fig 1.3.
e. Replace the instrument terminal cover and
evenly tighten the two 'A' screws.
Fig 1.2 BA364ND installation procedure
1.5.3 EMC
The BA364ND complies with the requirements of
the European EMC Directive 2004/108/EC. 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.
The BA364ND earth terminal should be
connected to a local earth, or to a cable screen
which is earthed in the safe area.

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Fig 1.3 Dimensions and terminal connections
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 control cover by undoing the two
‘C’ screws – see Fig 1.2. If the instrument is
fitted with external push-buttons the connecting
ribbon cable should be unplugged. The security
code override link is located on the inner row of
the five pin connector shown in 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 BA364ND
instruments should be returned to BEKA
associates for repair, or to our agent in your area.
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 are 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 Units of measurement & instrument
identification
All instruments are fitted with a display label
behind the armoured glass window. This label
can be supplied printed with any units of
measurement and tag information specified when
the instrument is ordered. Alternatively the
information may be added on-site via an
embossed strip, dry transfer or a permanent
marker.
To gain access to the display label remove the
terminal cover by unscrewing the two 'A' screws
which will reveal two concealed 'D' screws.
Remove all four 'D' screws and carefully lift off
the front of the instrument - see Fig 1.2. Add
the required legend to the display label, or
replace with a new pre-printed label which can be
supplied by BEKA associates.
The BA364ND can also be supplied with a blank
or custom engraved stainless steel plate secured
by two screws to the side of the instrument
enclosure. This plate can accommodate:
1 row of 9 alphanumeric characters 10mm
high.
or 1 row of 11 alphanumeric characters 7mm
high
or 2 rows of 18 alphanumeric characters 5mm
high.
1.9.2 Pipe mounting kits
Two pipe mounting kits are available for securing
the BA364ND to a horizontal or vertical pipe.
BA392D Stainless steel bracket secured by
two worm drive hose clips for 60 to
80mm outside diameter pipes.
BA393 Heavy duty stainless steel bracket
secured by a single 'V' bolt. Will
clamp to any pipe with an outside
diameter between 40 and 80mm.
1.9.3 Stem mounting kit
The BA395 stem mounting kit enables the
BA364ND to be mounted onto a field instrument.
1.9.4 Optional external push-buttons
For applications requiring frequent access to the
programme menus, the BA364ND can be
supplied with an external membrane keypad.
These push-buttons which maintain the IP66
enclosure integrity allow all functions to be
controlled without removing either of the
enclosure covers.
1.9.5 Optional control outputs / alarm outputs
The BA364ND can be supplied with two
programmable solid state single pole outputs.
The function of these outputs depends upon how
the BA364ND has been programmed i.e. as a
counter, timer, tachometer or as 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 BA364ND 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.
1.9.5.1 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 = 5+ 0.6V
Roff = greater than 180k
Note: Because of the series protection diode
some test meters may not detect a
closed alarm / control output.
Fig 1.5 Equivalent circuit of each control output

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1.9.5.2 Ex nL certification
Both control outputs are galvanically isolated
solid state switches which have been certified as
separate Ex nL circuits. The maximum input
safety parameters for each alarm are:
Ui = 30V dc
Ii = 100mA dc
This allows each control output to switch any dc
circuit providing that in normal operation the
maximum supply voltage is not greater than
30CV dc and the maximum current is not greater
than 100mA dc.
1.9.6 Optional pulse output
The BA364ND 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.
The output is a polarised current sink
Ron = 60+ 3V
Roff = 1M
1.9.6.1 Ex nL certification
The pulse output is optically isolated and has
been certified as a separate Ex nL circuit with
maximum input safety parameters of:
Ui = 30V dc
Ii = 100mA dc
To comply with the Ex nL certification, the
maximum pulse supply voltage and current must
not exceed 30V dc and 100mA dc in normal
operation.
Fig 1.6 Pulse output connections
1.9.7 Optional 4/20mA output
The BA364ND 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 BA364ND 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 BA364ND is programmed as a timer or
as a clock.
1.9.7.1 Ex nL certification
The 4/20mA output is optically isolated and has
been certified as a separate Ex nL circuit with
maximum input safety parameters of:
Ui = 30V dc
Ii = 100mA dc
To comply with the Ex nL certification, the
maximum pulse supply voltage and current must
not exceed 30V dc in normal operation.
Fig 1.7 4/20mA output connections

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1.9.8 Optional display backlight
The BA364ND 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 Ex nL circuit.
The Type nL input parameters are:
Ui = 30V dc
Ii = 100mA dc
This allows the backlight to be powered from any
safe area 18 to 30V dc supply providing that in
normal operation the maximum supply voltage is
not greater than 30V dc. See Fig 1.8
Fig 1.8 Connections for backlight