BEKA BA314E User manual

Issue: 1
7th February 2017
BA314G and BA314E
Intrinsically safe
Tachometers
Issue 1

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 Power supply
3.4 Pulse input terminals
3.4.1 sensors that do not require energising.
3.4.2 sensors that require energising
3.5 Remote reset terminals
3.6 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 Open Collector input
4.1.5 2-wire proximity detector input
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 Open collector
4.2.5 2-wire proximity detector input
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 Installation procedure
5.3 EMC
5.4 Units of measurement and tag marking on
scale card.
6. Configuration and Calibration
6.1 Calibration structure
6.2 Accessing configuration functions
6.3 Summary of configuration functions
6.4 Input: inPut
6.5 Input type: inP .tYPE
6.6 Debounce: dEbouncE
6.7 Display update interval: uPdAtE
6.8 Run-time display: di5P-2
6.9 Position of the decimal points: dP
6.10 Speed scale factor: 5CALE .5
6.11 Timebase: t-bA5E
6.12 Display filter: FiLtEr
6.13 Clip-off: CLP oFF
6.14 Local reset: LoC clr
6.15 Local run-time reset: clr tot
6.16 Local grand total run-time reset: clr gtot
6.17 Grand total run-time reset from within the
configuration menu: Clr .Gtot
6.18 Security code: CodE
6.19 Reset configuration to factory defaults:
r5Et def
6.20 Pulse output
6.20.1 Intrinsic safety
6.20.2 System designing
6.20.3 Configuration
6.20.4 Access Pulse output sub-menu
6.20.5 Enable pulse output
6.20.6 Source of output pulse
6.20.7 Divide output pulse frequency
6.20.8 Define output pulse width
6.20.9 Pulse storage
7. Configuration example
7.1 Configuration 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
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CONTENTS
The BA314G and BA314E are CE marked to show compliance with the European Explosive Atmospheres
Directive 2014/34/EU and the European EMC Directive 2014/30/EU

9. Accessories
9.1 Units of measurement and instrument
identification.
9.2 Display backlight
9.3 Alarms
9.3.1 Solid state output
9.3.2 Intrinsic safety
9.3.3 Configuration & adjustment
9.3.4 Alarm enable: EnbL
9.3.5 Type of alarm: tYPE
9.3.6 Setpoint adjustment: 5P1x & 5P2x
9.3.7 Alarm function: Hi .Lo
9.3.8 Alarm output status: no .nC
9.3.9 Hysteresis: H5tr
9.3.10 Alarm delay: dELA
9.3.11 Alarm silence time: 5IL
9.3.12 Flash display when alarm occurs:
FL5H
9.3.13 Access Setpoint: AC5P
9.3.14 Adjusting alarm setpoints
from the display mode.
9.4 4/20mA output
9.4.1 Intrinsic safety
9.4.2 System design
9.4.3 Configuration & calibration
9.4.4 Access 4/20mA output sub-menu:
4-20 oP
9.4.5 Enable 4/20mA output: EnbL
9.4.6 Display which corresponds to 4mA
output: 4.000
9.4.7 Display which corresponds to 20mA
output: 20 .000
Appendix 1 Dust certification
Appendix 2 IECEx certification
Appendix 3 ETL & cETL certification for
installation in USA and Canada.
Appendix 4 BA314E Tachometer
3
CONTENTS CONTINUED

4

1. DESCRIPTION
These intrinsically safe, Tachometers are primarily
intended for measuring rotational speed within
hazardous areas. To assist with routine maintenance,
they also include a run-time clock that records the
number of hours that the monitored machinery has
been operating.
The BA314G and the BA314E are functionally
identical and have similar certifications, but differ in
mechanical construction and options.
The differences are summarised in the following table.
BA314G BA314E
Separate
terminal
compartment.
No Yes
Pulse output Yes Yes
Backlight Option Yes
4/20mA output. Option Yes
Dual alarms Option Yes
Certification
IECEx Gas & dust Gas
ATEX Gas & dust Gas
ETL & cETL Gas & dust Gas & dust
The main sections of this instruction manual describe
the BA314G, but also apply to the BA314E. Details of
the BA314E mounting and terminals are contained in
Appendix 4.
The BA314G and BA314E have been ATEX certified
intrinsically safe by Notified Body Intertek Testing and
Certification Ltd and comply with the European ATEX
Directive 2014/34/EU. The BA314G has gas and dust
certification, but the BA314E only has ATEX gas
certification.
The main sections of this manual describe ATEX gas
certification.
For international applications the BA314G and
BA314E also have IECEx certification which is
described in Appendix 2. The BA314E does not
have IECEx dust certification.
For applications in the USA and Canada the BA314G
and BA314E have ETL & cETL certification which is
described in Appendix 3.
2. OPERATION
Fig 1 shows a simplified block diagram of the
BA314G Tachometer. The instrument can accept
pulses from most types of sensor and display speed
per second, minute or per hour, plus run-time in
hours on a separate display.
The BA314G has a single pair of input terminals for
connection to all types of sensor. When connected to
a sensor requiring energising, such as a switch
contact, open collector or a two wire proximity
detector, an external link between terminals 3 and 4
connects power to the sensor input terminals. An
isolated pulse output can be configured to
synchronously retransmit the pulse input, or a
frequency divided frequency output with a defined
pulse width.
Factory fitted accessories include an internally
powered display backlight, dual alarms and an
isolated 4/20mA output which may be configured to
retransmit any part of the speed display.
Fig 1 BA314G block diagram
5

2.1 Initialisation
Each time power is applied to a Tachometer
initialisation is performed. After a short delay the
following display sequence occurs:
All segments of the display are activated
Tachometer starts functioning, using the
configuration information stored in the
instrument’s permanent memory. Unless the
run-time display has been reset to zero, new
elapsed time will be added to the existing run-
time total.
2.2 Controls
The BA314G is controlled and configured via four
front panel push buttons. In the display mode i.e.
when the instrument is displaying speed the push
button functions are:
Push Button Functions
& + * Resets run-time display to zero.
This is a configurable function.
See 6.15
)
+ *Run-time grand total.
If buttons are pressed for ten seconds or
longer grand total run-time is reset to
zero. This is a configurable function.
See 6.16
(+ &Shows in succession, firmware version
number, instrument function tacho and
any output accessories that are fitted:
- A Dual alarm outputs
- P Pulse output
(Fitted to all BA314G)
- C 4/20mA output
( + )Access to configuration menu
Note: When optional alarms are fitted, the
Tachometer may be configured to provide direct
access to the alarm setpoints from the display mode
when the (+ *buttons are operated.
See 9.4.13 and 9.4.14
2.3 Displays
The BA314G has two digital displays and associated
annunciators, plus a pulse input indicator as shown
on page 1.
Speed On upper eight digit display
display
Run-time On lower six digit display.
display Shows time in hours, with a
resolution of 0.1 hours, that
monitored machinery has been
operating. May be turned off.
See 6.8
Pulse input This disc in the lower left hand
indicator corner of the display 'rotates'
for two seconds each time an
input pulse is received.
Appears to rotate continuously
when input frequency exceeds
0.5Hz.
Hold Activated when input frequency
annunciator is below the clip-off threshold at
which the run-time timer stops
functioning.
Reset Activated while run-time display
annunciator is being reset to zero.
Grand total Activated while run-time grand
annunciator total which is shown in hours is
being displayed.
6

3. INTRINSIC SAFETY CERTIFICATION
The BA314G has ATEX and IECEx gas and dust
certification. This section of the instruction manual
describes ATEX gas certification. ATEX dust and
IECEx approvals are described in Appendixes
1 and 2.
3.1 ATEX gas certification
Notified Body Intertek Testing and Certification Ltd
have issued the BA314G with an EU-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, Ex ia IIC T5 Ga equipment.
The Tachometer 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 EN 60079-14 Electrical installations design,
selection and erection. 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 BA314G Tachometer has been certified
Ex ia IIC T5 Ga. 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
In gases that may be used with equipment 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.
CAUTION installation in Zone 0
When installed in a Zone 0 potentially explosive
atmosphere requiring EPL Ga apparatus, 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
label and iron/steel is excluded.
No special conditions apply when the BA314G
Tachometer is installed in Zone 1 or in Zone 2. This
allows the BA314G 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 Power supply
When installed in a hazardous area the BA314G
should be powered from a certified Zener barrier,
galvanic isolator or associated apparatus with an
intrinsically safe voltage output.
The safety parameters of terminals 1 and 2 are:
Ui = 28V dc
Ii = 200mA dc
Pi = 0.84W
Uo = 0
Io = 0
Any certified Zener barrier, galvanic isolator or
associated apparatus with output safety parameters
equal to or less than these input 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 some applications, should be
subtracted from the maximum permitted cable
parameters specified for the Zener barrier, galvanic
isolator or associated apparatus powering the
BA314G Tachometer.
7

3.4 Pulse input terminals
The BA314G Tachometer has a single pair of pulse
input terminals 5 and 6 that may be configured for use
with different types of sensor.
For sensors that require energising to determine their
state, such as switch contacts or a 2-wire proximity
detector, an external link between terminals 3 & 4 of
the BA314G connects an internal 7V, 6mA supply to
the input. Energising is not required when the
Tachometer's input is connected to a voltage pulse
source.
Fitting an external link between terminals 3 & 4
changes the output safety parameters of the
Tachometer input terminals 5 & 6 as shown in the
following table. This table also shows the types of
sensor requiring energising (link fitting).
Output safety parameters
Type of input Link 3 & 4 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
3.4.1 Sensor not requiring energising
Sensors employing magnetic pick-offs or voltage
pulse sensors do not require energising, therefore
terminals 3 & 4 should not be linked. When not
energised i.e. without a link, the output parameters of
the pulse input terminals comply with the
requirements for simple apparatus. 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 their output parameters
Uo, Io & Po to be ignored when assessing the safety
of an intrinsically safe system, thus simplifying loop
assessment and documentation.
Almost any Sensor with a voltage pulse output may be
directly connected to the BA314G input in a
hazardous area providing that:
a. The Sensor is a certified intrinsically safe device
having output parameters equal to or less than:
Uo 28V dc
Io 200mA dc
Po 0.84W
or complies with requirements for
simple apparatus.
b. The Sensor and associated wiring can withstand
a 500V rms insulation test to earth.
c. The Sensor is located in the same hazardous
area as the BA314G. The BA314G EU-Type
Examination Certificate specifies that the
equivalent capacitance and inductance of the
pulse input is:
Ci = 2nF
Li = 4µH
To determine the maximum permissible cable
parameters these figures should be subtracted from
the maximum permitted output parameters Lo and
Co specified by the certificate for the Sensor
connected to the totaliser's pulse input terminals.
The totalisers pulse input equivalent capacitance
and inductance are small and unlikely to make a
significant difference to the allowable cable
parameters.
3.4.2 Sensors requiring energising
Sensors with switch contacts, proximity detector or
open collector outputs require energising which is
achieved by linking Tachometer terminals 3 and 4
together as described in section 3.4. When
energised, the output parameters of the pulse input
terminals 5 and 6 are:
Uo = 10.5V dc
Io = 9.2mA dc
Po = 24mW
These output parameters do not comply with the
requirements for simple apparatus and should be
considered when assessing the safety of the Sensor
connected to the totaliser pulse input.
Any certified intrinsically safe Sensor may be
connected to a BA314G energised input providing
that:
a. The Sensor is a certified intrinsically safe
device having input parameters equal to or
greater than:
Uo 10.5V dc
Io 9.2mA dc
Po 24mW
or complies with the requirements for
simple apparatus such as switch
contacts.
b. The Sensor and associated wiring can
withstand a 500V rms insulation test to earth.
c. The Sensor is located in the same hazardous
area as the BA314G.
d. Minimum operating voltage of a proximity
detector is less than 7.5V.
e. The maximum capacitance and inductance that
may be safely connected to the energised
pulse input terminals 5 & 6 (terminals 3 & 4
linked) is:
Co = 2.4µF
Lo = 200mH
This is not restrictive as the combined capacitance
and inductance of most sensors and the connecting
cable will be less than this.
8

3.5 Remote reset terminals
The BA314G run-time display may be reset to zero by
connecting the external reset terminals RS1 and RS2
together for more than one second. The two reset
terminals have the following input and output safety
parameters:
Uo = 3.8V dc
Io = 1mA
Po = 1mW
Ui = 28V dc
Ii = 200mA dc
Pi = 0.84W
The equivalent capacitance and inductance between
them is:
Ci = 0
Li = 0
The maximum cable capacitance and inductance that
may be safely connected between the reset terminals
RS1 and RS2 is:
Co = 40µF
Lo = 1H
The reset terminals may be directly connected to any
mechanically operated switch located within the same
hazardous area as the BA314G Tachometer. The
switch and associated wiring should be able to
withstand a 500V insulation test to earth.
If the reset switch is required in 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 diode return Zener
barrier is not suitable for this application.
Alternatively the BA314G may be configured so that
the total display is reset to zero when the &and *
push buttons are operated simultaneously for more
than two seconds. See 6.19
3.6 Certification label information
The Tachometer certification information label is fitted
in a recess on the top outer surface of the instrument
enclosure. It shows the ATEX, IECEx and ETL
certification information plus BEKA associates name,
location, year of manufacture and the instrument
serial number. Other certification information may
also be included.
BA314G Certification information label
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 BA314G.
Terminals 2, 6 and RS2 of the BA314G Tachometer
are internally connected together. If any of these
terminals are earthed, as shown in Figs 2 & 3, the
other common terminals should only be connected
to the same earth, i.e. the barrier busbar, or to
circuits that have 500V insulation to earth.
Any Zener barrier may be used with the BA314G
providing it's certification is for use with apparatus in
the required Zone and gas group, and it's output
parameters do not exceed the input parameters of
the Tachometer terminals to which it is connected.
Only one polarity of Zener barrier i.e. positive or
negative, may be used in a Tachometer system.
Fig 2 illustrates the basic circuit that is used for all
BA314G installations protected by Zener barriers.
For simplicity, connections for the pulse output and
optional alarms and 4/20mA output are shown
separately in sections 6.20 and 9 of this manual.
Fig 2 BA314G used with Zener barriers
9

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 Tachometer
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 and RS2 are interconnected within
the BA314G. See Fig 1.
Fig 3 BA314G used with Zener barriers pulse source
in the safe area.
4.1.1 Power supply
The BA314G Tachometer requires a minimum of 10V
between terminal 1 & 2 and consumes:
10mA without optional backlight
plus 6mA when terminals 3 & 4 are linked
Any certified Zener barrier may be used to power a
BA314G Tachometer providing the output safety
parameters of the barrier are equal to or less than the
input safety parameters of terminals 1 & 2 of the
Tachometer.
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 must be between 15.5V and the
maximum working voltage of the Zener barrier
which, depending upon manufacturer, will be
approximately 26V.
Note: The optional factory fitted display backlight
increase the instrument's current
consumption to 32mA and therefore
increases the minimum safe area operating
voltage, see section 9.2 for details.
4.1.2 Pulse input
As shown in Figs 2 and 3 the BA314G can display
the rate and total flow from sensors with a wide
variety of pulse outputs located in safe and
hazardous areas.
No Zener barrier is required in series with the input if
the intrinsically safe sensor is located within the
same hazardous area as the Tachometer. The
following table shows the Tachometer's input
switching thresholds when conditioned for use with
sensors having different outputs, For reliable
totalisation the Tachometer pulse input must fall
below the lower threshold and rise above the upper
threshold.
Input transducer
Switching thresholds
Lower Upper
Open collector 2k10k
Voltage pulse
low
1.0V 3.0V
Voltage pulse
high
3.0V 10.0V
Magnetic pick-off 0 40mV peak
Proximity
detector
1.2mA 2.1mA
Switch 1001000
Switch contact, proximity detector or open collector
sensors require energising which is achieved by
linking Tachometer terminals 3 and 4.
10

4.1.3 Switch contact input
Any mechanically or magnetically activated switch
contact located in the same hazardous area as the
Tachometer may be directly connected to pulse input
terminals 5 and 6, providing the sensor and
associated wiring can withstand a 500V rms insulation
test to earth. Most magnetically activated reed relays
comply with these requirements and the requirements
for simple apparatus. The BA314G contains a
configurable debounce circuit to prevent false
triggering. Three levels of de-bounce protection are
available. See section 6.6.
4.1.4 Open collector input
Most certified intrinsically safe sensors with an open
collector output may be directly connected to a
BA314G input terminals 5 & 6, providing the input
safety parameters of the open collector sensor are
equal to or greater than the output safety parameters
of Tachometer's pulse input. i.e.
Ui 10.5V dc
Ii 8.2mA dc
Pi 24mW
The open collector sensor must be located in the
same hazardous area as the BA314G and the
associated wiring should be able to withstand a 500V
rms insulation test to earth.
The BA314G contains a configurable debounce circuit
to prevent false triggering. Three levels of de-bounce
protection are available. See section 6.6.
4.1.5 2-wire proximity detector input
Most certified intrinsically safe sensors incorporating a
NAMUR 2-wire proximity detector may be directly
connected to a BA314G input, providing the input
safety parameters of the sensor (proximity detector)
are equal to or greater than the output safety
parameters of Tachometer's pulse input. i.e.
Ui 10.5V dc
Ii 8.2mA dc
Pi 24mW
The minimum operating voltage of the sensor
(proximity detector) should be less than 7.5V. The
sensor must be located in the same hazardous area
as the BA314G and the associated wiring should be
able to withstand a 500V rms insulation test to earth.
The Tachometers contain a configurable debounce
circuit to prevent false triggering. Three levels of
debounce protection are available. See section 6.6.
4.1.6 Magnetic pick-off input
Sensors incorporating a magnetic pick-off to sense
movement will have a low level voltage output
unless the sensor incorporates an amplifier. CoiL in
the BA314G input configuration menu is a low level
voltage pulse input intended for use with an
intrinsically safe magnetic pick-off. When a
Tachometer is configured for CoiL and terminals 3 &
4 are not linked, the input terminals 5 & 6 comply
with the requirements for simple apparatus allowing
connection to any certified intrinsically safe magnetic
sensor having output parameters equal to or less
than:
Uo 28V dc
Io 200mA dc
Po 0.84W
The maximum permitted cable parameters will be
the magnetic pick-off's Co and Lo specified on it's
intrinsic safety certificate, less the Tachometers
pulse input parameters Ci and Li which are small
and can often be ignored.
The sensor must be located within the same
hazardous area as the Tachometer and with the
associated wiring be able to withstand a 500V rms
insulation test to earth.
The Tachometer contains a configurable debounce
circuit to prevent false triggering. Three levels of
debounce protection are available. See section 6.6.
4.1.7 Voltage pulse input
Two voltage pulse input ranges are selectable in the
BA314G Tachometer configuration menu, VoLt5 L
and VoLt5 H. When configured for either of the
voltage pulse ranges and terminals 3 & 4 are not
linked, the input terminals 5 & 6 comply with the
requirements for simple apparatus. This allows the
input to be connected to any certified intrinsically
safe voltage out[put sensor located in the same
hazardous area as the Tachometer having output
parameters equal to or less than:
Uo 28V dc
Io 200mA dc
Po 0.84W
The Tachometer input may therefore be directly
connected to most certified intrinsically safe sensors
with a high level voltage pulse output.
The maximum permitted cable parameters will be
defined by the intrinsic safety certification of the
sensor less the Tachometers input parameters Ci &
Li which are small and can often be ignored.
The Tachometers contain a configurable debounce
circuit to prevent false triggering of the instrument.
Three levels of de-bounce protection are available.
See section 6.7.
11

4.1.8 Remote reset
The Tachometer's run-time display may be remotely
reset to zero by connecting terminals RS1 and RS2
together for more than one second. Permanent
interconnection inhibits the run-time clock. Remote
resetting may be accomplished by any mechanically
operated switch located in the same hazardous area
as the Tachometer providing the switch and the
associated wiring can withstand a 500V rms insulation
test to earth. No Zener barrier is required.
A BA314G may also be remotely reset from the safe
area. Any switch may be used but a Zener barrier is
required to transfer the contact closure into the
hazardous area which may be combined with the
supply barrier so that only one package is required. A
diode return barrier is not suitable for this application.
Fig 2 illustrates how a BA314G may be reset from
both the safe and the hazardous area.
Note: The Tachometer may be configured to reset
the total display to zero by operating the &
and *push buttons simultaneously for more
than two seconds in the totalising mode i.e.
when the instrument is displaying flow. See
section 6.15.
4.2 Use with Galvanic Isolators
Galvanic isolators are probably the simplest
intrinsically safe interface to install as they provide
isolation and do not require a high integrity earth
connection.
Any galvanic isolator may be used with the BA314G
providing it's certification is for use with apparatus in
the required Zone and gas group, and it's output
parameters do not exceed the input parameters of
the Tachometer terminals to which it is connected. It
must also have the correct function.
Fig 4 BA314G used with galvanic isolators.
Fig 4 illustrates the basic circuit that is used for all
BA314G Tachometer installations protected by
galvanic isolators. For simplicity, connections for
the pulse output, optional alarms and 4/20mA output
are shown in sections 6.20 and 9 of this manual.
The Tachometer’s pulse source may also be located
in the safe area as shown in Fig 5. An additional
galvanic isolator is used to transfer the signal to the
Tachometer in the hazardous area, although it may
be difficult to find isolators for transferring some
sensor outputs.
12

Fig 5 Pulse source in safe area
4.2.1 Power supply
The BA314G Tachometer requires a minimum of 10V
between terminal 1 & 2 and consumes:
10mA without optional backlight
plus 6mA when terminals 3 & 4 are
linked.
The total current increases to 32mA when an optional
backlight is fitted.
Any galvanic isolator certified for the gas group and
Zone in which the BA314G is installed may be used to
power the instrument. The output safety parameters
of the isolator must be equal to or less than the input
safety parameters of terminals 1 & 2 and the voltage
at terminals 1 & 2 must be greater than 10V. These
requirements are not restrictive and allow a wide
range of galvanic isolators, such as solenoid drivers,
to be used.
4.2.2 Pulse input
As shown in Figs 4 and 5 the BA314G input can be
directly connected to hazardous area sensors, or to
safe area sensors via an isolator. Galvanic isolators
are not required in series with the input if the
intrinsically safe sensor is located within the same
hazardous area as the Tachometer.
The BA314G Tachometer may be used with sensors
having a wide variety of pulse outputs. The following
table shows the switching thresholds for each type.
For reliable operation the Tachometers input signal
must fall below the lower threshold and rise above
the upper threshold.
Input transducer Switching thresholds
Lower Upper
Open collector 2k10k
Voltage pulse low 1.0V 3.0V
Voltage pulse high 3.0V 10.0V
Magnetic pick-off 0mV 40mV peak
Proximity detector 1.2mA 2.1mA
Switch 1001000
Switch contacts, proximity detectors and open
collector sensors require energising which is
achieved by linking terminals 3 and 4 together as
shown in Figs 4 and 5.
4.2.3 Switch contact input
Any sensor with a mechanical or magnetically
activated switch contact output may be directly
connected to input terminals 5 & 6 providing the
sensor is located in the same hazardous area as the
Tachometer and the sensor and associated wiring
can withstand a 500V rms insulation test to earth.
Most magnetically activated reed relays comply with
these requirements. The BA314G contain a
configurable debounce circuit to prevent contact
bounce being counted. Three levels of de-bounce
protection are independently available. See section
6.6.
4.2.4 Open collector input
Most certified intrinsically safe open collector
sensors may be directly connected to the BA314G
input terminals 5 & 6, providing the input safety
parameters of the open collector sensor are equal to
or greater than the output safety parameters of
Tachometer's pulse input. i.e.
Ui 10.5V dc
Ii 8.2mA dc
Pi 24mW
The open collector sensor must be located in the
same hazardous area as the BA314G and the
associated wiring should be able to withstand a
500V rms insulation test to earth.
The BA314G contains a configurable debounce
circuit to prevent false triggering. Three levels of de-
bounce protection are independently available. See
section 6.6.
13

4.2.5 2-wire proximity detector input
Most certified intrinsically safe NAMUR 2-wire
proximity detectors may be directly connected to a
BA314G input, providing the input safety parameters
of the proximity detector are equal to or greater than
the output safety parameters of a BA314G input:
Ui 10.5V dc
Ii 8.2mA dc
Pi 24mW
and the minimum operating voltage of the proximity
detector is less than 7.5V. The proximity detector
must be located in the same hazardous area as the
Tachometer and the associated wiring must be able to
withstand a 500V rms insulation test to earth.
The BA314G contain a configurable debounce circuit
to prevent false triggering of the instrument. Three
levels of de-bounce protection are available.
See section 6.6.
4.2.6 Magnetic pick-off input
CoiL in the BA314G input configuration menu is a low
level voltage pulse input intended for use with an
intrinsically safe magnetic pick-off. When a
Tachometer input is configured for CoiL and terminals
3 & 4 are not linked, input terminals 5 & 6 comply with
the requirements for simple apparatus allowing
connection to any certified intrinsically safe magnetic
sensor having output parameters equal to or less
than:
Uo 28V dc
Io 200mA dc
Po 0.84W
The maximum permitted cable parameters will be be
the sensor's Co and Lo specified on it's intrinsic safety
certificate, less the Tachometers pulse input
parameters Ci and Li which are small and can often
be ignored.
The sensor must be located within the same
hazardous area as the BA314G and with the
associated wiring must be able to withstand a 500V
rms insulation test to earth.
The BA314G Tachometer contains a configurable
debounce circuit to prevent false triggering. Three
levels of debounce protection are available. See
section 6.6.
4.2.7 Voltage pulse input
Two voltage pulse input ranges are independently
selectable in the BA314G Tachometer configuration
menu, VoLt5 L and VoLt5 H. When configured for
either of the voltage pulse ranges, and terminals 3 &
4 are not linked, the input terminals 5 & 6 comply
with the requirements for simple apparatus. This
allows the pulse input to be connected to any
certified intrinsically safe sensor with a voltage
output located within the same hazardous area as
the Tachometer providing it has output parameters
equal to or less than:
Uo 28V dc
Io 200mA dc
Po 0.84W
The BA314G Tachometers may therefore be directly
connected to most certified intrinsically safe sensors
with a high level voltage output.
The maximum permitted cable parameters will be
defined by the sensor's intrinsic safety Co and Lo
less the Tachometer's pulse input parameters Ci and
Li which are small and can often be ignored.
The BA314G contain a configurable debounce circuit
to prevent false triggering of the instrument. Three
levels of de-bounce protection are available.
See section 6.6.
4.2.8 Remote reset
The Tachometer's run-time display may be remotely
reset to zero by connecting terminals RS1 and RS2
together for more than one second. Permanent
interconnection inhibits the run-time clock. Remote
resetting may be accomplished by any mechanically
operated switch located in the same hazardous area
as the Tachometer providing the switch and the
associated wiring can withstand a 500V rms
insulation test to earth. No galvanic isolator is
required.
A BA314G may also be remotely reset 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 a
BA314G may be reset from both the safe and the
hazardous area.
Note: The BA314G Tachometer may be
configured to reset the total display to zero
by operating the &and * push buttons
simultaneously for more than two seconds
in the totalising mode i.e. when the
instrument is displaying flow. See 6.15
14

5. INSTALLATION
5.1 Location
The BA314G Tachometer is housed in robust IP66
glass reinforced polyester (GRP) enclosure
incorporating an armoured glass window and stainless
steel fittings making it suitable for exterior mounting in
most industrial on-shore and off-shore installations.
The Tachometer should be positioned where the
display is not in continuous direct sunlight. Special
conditions apply for Zone 0 installations, see section
3.2.
Field wiring terminals are located on the rear of the
Tachometer assembly as shown in Fig 7.
To ensure electrical continuity between the two
conduit or cable entries, the enclosure back-box is
fitted with a bonding plate which includes an M4 earth
stud. This may be mounted on the inside or outside
of the enclosure. If the carbon loaded GRP enclosure
is not bolted to an earthed post or structure, this earth
stud should be connected to a local earth or to the
plant potential equalising conductor.
An insulated M4 stud is provided in the bottom right
hand corner the back-box for interconnecting cable
screens.
The BA314G Tachometer may be pipe mounted using
a BA393G pipe mounting kit, or panel mounted using
a BA394G or BA395G panel mounting kit.
5.2 Installation Procedure
Fig 6 illustrates the instrument installation procedure.
A. Remove the Tachometer assembly by
unscrewing the four captive 'A' screws.
B. Mount the enclosure back-box on a flat surface
and secure with screws or bolts through the four
'B' holes. Alternatively use one of the pipe or
panel mounting kits which are available as
accessories.
C. Remove the temporary hole plug and install an
appropriate IP and temperature rated M20 x
1.5mm cable gland or conduit fitting. If two
entries are required, the supplied IP66 stopping
plug should be replaced with an appropriate IP
and temperature rated M20 x 1.5mm cable gland
or conduit fitting.
D. Connect the field wiring to the terminals as
shown in Fig 7. Replace the instrument
assembly on the back-box and evenly tighten the
four 'A' screws.
Fig 6 BA314G installation procedure
Fig 7 Dimensions and terminal connections
15

5.3 EMC
The BA314G complies with the requirements of the
European EMC Directive 2014/30/EU. For specified
immunity all wiring should be in screened twisted
pairs, with the screens earthed at one point in the safe
area.
5.4 Units of measurement and tag marking
on scale card.
The Tachometer's units of measurement and tag
information can be shown on a scale card which
slides into the instrument.
New Tachometers are supplied with a printed scale
card showing the requested units of measurement
and tag information. If this information is not supplied
when the instrument is ordered, a blank scale card will
be fitted which can easily be marked on-site with a dry
transfer or a permanent marker. Custom printed scale
cards are available from BEKA associates as an
accessory.
To remove the scale card from a Tachometer carefully
pull the transparent tab at the rear of the instrument
assembly away from the assembly as shown in
Fig 8a.
Fig 8a Removing scale card
To replace the scale card carefully insert it into the slot
on the right hand side of the input terminals as shown
in Fig 8b. Force should be applied evenly to both
sides of the scale card to prevent it twisting. The
card should be inserted until about 2mm of the
transparent tab remains protruding.
Fig 8b Inserting scale card into the
instrument assembly.
16

6.0 CONFIGURATION & CALIBRATION
The BA314G Tachometer is configured and calibrated
via four front panel push buttons. All the
configuration functions are contained in an easy to
use intuitive menu that is shown diagrammatically in
Fig 10.
Each menu function is summarised in section 6.3 of
this manual and each summary includes a reference
to more detailed information.
When factory fitted optional alarms, pulse and 4/20mA
outputs are included, additional functions appear in
the configuration menu, which are described
separately in section 9.
All new Tachometer are supplied calibrated as
requested at the time of ordering. If calibration is not
requested, the Tachometer will have default
configuration as shown in the following table, but can
easily be re-configured on-site.
Function Display Default
Input inP .tYPE oP .CoL
Debounce dEbounCE dEFAuLt
Update uPdAtE 0 .5
Run-time display di5P-2 on
Decimal point (speed) dP 0000 .0
Speed scale factor 5CALE .5001.00
Timebase t-bA5E tb-60
Filter FiLter 24
Clip-off CLP-oFF 0000 .0
Local run-time reset clr tot oFF
Local grand total
run-time reset. Clr gtot oFF
Security code CodE 0000
6.1 Calibration structure
Fig 9 shows the BA314G calibration structure.
The pulse input is divided by 5CALE.5 to provide the
required Tachometer speed display in engineering
units. e.g. if a sensor monitoring a rotating shaft
generates 18 pulses per revolution, to produce a
display in revolutions 5CALE.5 should be set to 18.0.
The timebase t-bA5E is a multiplying factor that
determines whether the Tachometer displays speed
per second, per minute or per hour.
The Tachometer incorporates a run-time counter that
displays the time in hours that the speed of the
monitored machinery has been equal to or greater
than the Clip-off value.
Fig 9 Calibration structure
6.2 Accessing configuration functions
Throughout this manual push buttons are shown as
&, *, (and ). Legends displayed by the
instruments are shown in a seven segment font as
they appear on the Tachometers e.g. inPut and
uPdAtE.
Access to the configuration menu is obtained by
operating the (+ )push buttons simultaneously.
If the instrument is not protected by a security code
the first parameter inPut will be displayed. If a
security code other than the default code 0000 has
already been entered, the instrument will display
CodE. Press (to clear this prompt and enter the
security code for the instrument using the &or *
push button to adjust the flashing digit, and the (
push button to transfer control to the next digit. If
the correct code has been entered pressing ) will
cause the first parameter inPut 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.
All configuration functions and prompts are shown
on the upper eight digit display.
Once within the configuration menu the required
parameter can be selected by scrolling through the
menu using the &or *push buttons. The
configuration menu is shown diagrammatically in
Fig 10.
When returning to the display mode following
reconfiguration, the Tachometer will display dAtA
followed by 5AVE while the new information is stored
in permanent memory.
17

6.3 Summary of configuration functions
This section summarises all the configuration
functions. When read in conjunction with Fig 10 it
provides a quick aid for configuring the Tachometer. If
more detail is required, each section contains a
reference to a full description of the function.
Display Summary of function
inPut Input
Contains sub-menu with two
functions:
inP .tYPE Select Input type
dEbounCE Set debounce
See section 6.4
inP .tYPE
Configures the Tachometer to
accept one of six types of input:
oP .CoL Open collector *
VoLt5 L Voltage pulse <1 >3V
VoLt5 H Voltage pulse <3 >10V
CoiL Magnetic pick-off
Pr .dEt Proximity detector *
ContACt Switch contact *
*Link terminals 3 & 4
See section 6.5
dEbounCE
Defines level of input debounce
applied to the pulse input to prevent
false counting, three levels are
selectable:
dEFAuLt
heavy
LiGHt
See section 6.6
uPdAtE Display update interval
Defines the interval between display
updates from 0.5 to 5 seconds.
See section 6.7
di5P-2 Run-time display
Turns the lower display, which shows
run-time in hours, on or oFF.
See section 6.8
Display Summary of function
dP Decimal points
Defines the position of the decimal
point in the Tachometer speed
display.
See section 6.9
5CALE .5Speed scale factor
5CALE.5 is a dividing factor,
adjustable between 0.0001 and
99999, that converts the pulse input
into the required Tachometer speed
display.. e.g. If a sensor monitoring a
rotating shaft generates 18 pulses
per revolution, to produce a
Tachometer speed display in
revolutions 5CALE.5 should be set to
18.0.
See section 6.10
t-bA5E Timebase
Selectable multiplier allowing
Tachometer speed display to be in
units per second, per minute or per
hour.
Select:
tb-01 per second
tb-60 per minute
tb-3600 per hour
See section 6.11
FiLtEr Display filter
Adjustable digital filter that reduces
the noise on the Tachometer speed
display, comprising two parameters
each adjustable between 0 and 9.
The first digit defines the amount of
filtering applied to the display, the
second the deviation from the
displayed value at which the filter
will be overridden and the
Tachometer display will move rapidly
to the new value.
See section 6.12
CLP-oFF Clip-off
Clip-off is the Tachometer speed
display threshold below which the
run-time clock is inhibited.
See section 6.13
18

Display Summary of function
LoC clr Local reset
Contains sub-menu with two
functions enabling the run-time
display and grand total run-time to be
reset to zero via the front panel push
buttons when the Tachometer is in the
display mode.
See section 6.14
clr tot
When ‘on’ is selected, operating
the &and *buttons
simultaneously for more than three
seconds in the display mode
resets the run-time display to zero.
See section 6.15
clr gtot
When on is selected, operating the
)and *buttons simultaneously
for more than 10 seconds in the
display mode resets the run-time
grand total to zero.
See section 6.16
Display Summary of function
CLr Gtot Resets grand total run-time to
zero.
This function resets the grand total
run-time to zero from within the
configuration menu when CLr YE5 is
selected, and 5urE is entered to
confirm the instruction.
Note: Once reset, the original grand
total can not be recovered.
See section 6.17
CodE Security code
Defines a four digit alphanumeric
code that must be entered to gain
access to the configuration menu.
Default code 0000 disables the
security function and allows
unrestricted access to all
configuration functions.
See section 6.18
r5Et deF Reset to factory defaults
Returns the Tachometer to the
factory defaults shown in section 6.0
To prevent accidental use the
request must be confirmed by
entering 5urE before the reset will
be executed.
See section 6.19
19

20