BEKA BA377NE User manual

Issue: 6
3rd July 2018
BA377NE
Rugged one input
Ex nA and Ex tc
Timer or Clock
Issue 6

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1. DESCRIPTION
2. Ex nA NON-SPARKING CERTIFICATION
2.1 ATEX Ex nA certification
2.2 Zones, gas groups and T rating
2.3 Special conditions for safe use
2.4 Power supply
2.5 Input terminals
2.6 Remote reset terminals
2.7 Control outputs - optional
2.8 Certification label information
3. SYSTEM DESIGN FOR HAZARDOUS AREAS
3.1 Power supply
3.2 Pulse input
3.2.1 Input switching threshold
3.2.2 Switch contact input
3.2.3 Open collector input
3.2.4 2-wire proximity detector input
3.1.5 Magnetic pick-off input
3.1.6 Voltage pulse input
3.3 Remote reset
3.4 Control outputs - optional
3.4.1 Solid state output
3.4.2 Ex nA certification
4. INSTALLATION
4.1 Location
4.2 Installation procedure
4.3 Timer or Clock earthing
4.4 EMC
4.5 Scale card
5. ACCESSORIES
5.1 Display backlight
5.2 Control outputs
5.3 Scale card
5.4 Tag information
6. OPERATION AS A TIMER
6.1 Initialisation
6.2 Controls when configured as a Timer
6.3 Displays when configured as a Timer
6.4 Timer structure
6.5 Configuration as a Timer
6.5.1 Accessing configuration functions
6.5.2 Summary of Timer configuration
functions.
6.5.3 Instrument function: FunCtion
6.5.4 Input: inPut
6.5.5 Input type: inP .tYPE
6.5.6 debounce: debounce
6.5.7 Lower display: di5P-2
6.5.8 Starting & stopping the Timer:
5tAr5toP
6.5.9 Units of display: unit5
6.5.10 Set time: 5Et t
6.5.11 Repeat timing cycle: CYCLE5
6.5.12 Cycle function enable: EnbL
6.5.13 Cycle count: cycl cnt
6.5.14 Restart delay: r5t dela
6.5.15 Adjusting the set time 5Et t and
restart delay r5t dela from the
display mode: AC5Et t
6.5.16 Direction of count: uP or dn
6.5.17 Power fail: p fail
6.5.18 Local reset: LoC rEt
6.5.19 Local total reset: rE5Et .enbl
6.5.20 Local grand total reset: clr Gtot
6.5.21 Control output 1 (Optional): oP1
6.5.22 Control output 1 enable: EnbL
6.5.23 Control output on at: oP1 on
6.5.24 Control output off at: oP1 oFF
6.5.25 Output on delay time: oP1 dELA
6.5.26 Control output 2 (Optional): oP2
6.5.27 Reset grand total from within the
configuration menu: Clr Gtot
6.5.28 Security code: CodE
6.5.29 Reset configuration to Timer
factory defaults: r5Et dEF
7. TIMER CONFIGURATION EXAMPLES
7.1 Measuring the time that a contact is closed
7.2 Controlling an Ex nA solenoid valve
CONTENTS
The BA377NE is CE marked to show compliance with the European Explosive Atmospheres Directive
2014/34/EU and the European EMC Directive 2014/30/EU

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8 MAINTENANCE when configured as a Timer
8.1 Fault finding during commissioning
8.2 Fault finding after commissioning
8.3 Servicing
8.4 Routine maintenance
8.5 Guarantee
8.6 Customer comments
9. OPERATION AS A CLOCK
9.1 Initialisation and loss of power
9.2 Controls when configured as a clock
9.3 Displays when configured as a clock
9.4 Configration as a clock
9.4.1 Accessing configuration functions
9.4.2 Summary of Clock configuration
functions.
9.4.3 Instrument function: FunCtion
9.4.4 Display format: di5PLAY
9.4.5 Set Clock display time: 5et
9.4.6 Enter synchronising time: 5YnC t
9.4.7 Control output 1 (Optional): oP1
9.4.8 Enable Control output 1: EnbL
9.4.9 On and off times:
oP 1 :on 1; oP 1 :off 1
oP 1 :on 2; oP 1 :off 2
9.4.10 Control output 2 (Optional): oP2
9.4.11 Enable control output 2: EnbL
9.4.12 On and off times:
oP2 :on 1; oP2 :off 1
oP2 :on 2; oP2 :off 2
9.4.13 Access on &off times from display
mode: AC5P
9.4.14 Security code: CodE
9.4.15 Reset configuration to Clock
factory defaults: r5Et dEF
10. CLOCK CONFIGURATION EXAMPLE
10.1 Configuration procedure
11. MAINTENANCE when configured as a Clock
11.1 Fault finding during commissioning
11.2 Fault finding after commissioning
11.3 Servicing
11.4 Routine maintenance
11.5 Guarantee
11.6 Customer comments
Appendix 1 Dust certification
Appendix 2 IECEx certification
Appendix 3 ETL and cETL certification

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1. DESCRIPTION
The BA377NE is an Ex nA non-sparking and Ex tc
certified, panel mounting instrument with a single
input that can be installed in Zone 2 or Zone 22
without the need for Zener barriers or galvanic
isolators. It may be configured on-site as a Timer or
as a Clock. As a Timer the BA377NE is able to
measure and display the elapsed time between
external events, or control external events via two
optional factory fitted control outputs.
When configured as a Clock, the instrument can
display time in a variety of formats and the two
optional control outputs may be configured to switch
loads on and off at pre-set times.
This instruction manual is divided into sections.
Common features
2. Ex nA certification
3. System design for hazardous areas
4. Installations
5. Accessories
Timer
6. Operation as a timer
7. Configuration example
8. Maintenance
Clock
9. Operation as a clock
10. Configuration example
11. Maintenance
The common features sections of this instruction
manual describe ATEX Ex nA certification for use in
gas atmospheres.
Ex tc dust certification is described in Appendix 1.
For international applications the BA377NE has
IECEx gas and dust certification which is described
in Appendix 2.
For applications in the USA and Canada the
BA377NE has ETL and cETL certification which is
described in Appendix 3.
This instruction manual supplements the
abbreviated instruction sheet supplied with each
instrument.
2. Ex nA NON - SPARKING CERTIFICATION
The BA377NE has ATEX and IECEx gas and dust
certification. This section of the instruction manual
describes ATEX gas certification. Dust, IECEx and
other approvals are each described in separate
appendixes to this manual. The Ex nA and Ex tc
certification of the instrument is unaffected by
whether it is configured as a Timer or as a Clock.
2.1 ATEX Ex nA certification
Notified Body Intertek Testing and Certification Ltd
have issued the BA377NE with a Type Examination
Certificate number ITS16ATEX48409X. This has
been used to confirm compliance with the European
ATEX Directive for Group II, Category 3G
equipment. The instrument carries the Community
Mark and, subject to local codes of practice, may be
installed in any of the European Economic Area
(EEA) member countries and in the EEA EFTA
states, Iceland, Liechtenstein and Norway. ATEX
certificates are also acceptable in Switzerland and
Turkey. The European Commission's Blue Guide
lists the member states, overseas countries and
territories that have adopted harmonisation
legislation.
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.
2.2 Zones, gas groups and T rating
The Timer or Clock has been certified as Group II
Category 3G Ex ic nA IIC T5 Gc –40°C Ta +60°C
apparatus. This is non-sparking apparatus
complying with EN 60079-15 Equipment protection
by type of protection 'n' that minimises the risk of
arcs or sparks capable of creating an ignition hazard
occurring during conditions of normal operation.
The instrument's front panel push button contacts
are non incendive and have been certified
intrinsically safe Ex ic without the need for an
external Zener barrier or galvanic isolator, as shown
on the Type Examination Certificate. This allows the
Timer or Clock to be adjusted and configured live
when installed in a Ex n panel enclosure located in
Zone 2.

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When connected to a suitable system and correctly
mounted in a panel enclosure complying with the
requirements for Type of protection 'n', the panel
enclosure containing the BA377NE 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
In gases that may safely be used with equipment
having a temperature classification of:
T1 450oC
T2 300oC
T3 200oC
T4 135oC
T5 100oC
At ambient temperatures between -40 and +60oC.
This allows use with all commonly used industrial
gases except carbon disulphide CS2.
2.3 Special conditions for safe use
Special conditions for safe use are specified by the
Ex nA certificate indicated by the certificate
number's 'X' suffix. These state that the BA377NE
Timer or Clock should be:
a. Mounted such that the instrument terminals
are protected by at least an IP54 enclosure
compliant with IEC 60079-0 & IEC 60079-15.
b. Be supplied from limited energy circuits with
output parameters in normal operation equal
to, or less than the instruments input
parameters.
These special conditions for safe use can be
satisfied by mounting the BA377NE in an Ex n, Ex e
or Ex p panel enclosure. For ATEX Category 3
installations in Zone 2, self or third party certified
Ex n, Ex e or Ex p panel enclosures may be used.
Additional requirement apply for non-metallic panel
enclosures.
2.4 Power supply
The input safety parameters for the power supply
terminals 1 and 2 are:
Ui = 30V dc
Ii = 100mA
This allows the BA377NE to be powered from any
dc supply which in normal operation has an output
voltage of less than 30V. See section 3.1 for power
supply recommendations.
2.5 Input terminals
The BA377NE Timer or Clock 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 BA377NE connects an internal
7V, 6mA supply to the input terminals. Energising is
not required when the Timer or Clock input is
connected to a voltage pulse source.
Fitting an external link between terminals 3 & 4
changes the Timer or Clock's pulse input safety
parameters as shown below. This table also shows
the types of sensor requiring energising (link fitting).
Safety parameters
Input Output
Type of input Link 3 & 4 Ui Uo Io
Switch contact Yes 15V 10.5V 9.2mA
Proximity detector Yes 15V 10.5V 9.2mA
Open collector Yes 15V 10.5V 9.2mA
Magnetic pick-off No 30V 1.1V 0.5mA
Voltage input (low) No 30V 1.1V 0.5mA
Voltage input (high) No 30V 1.1V 0.5mA
2.6 Remote reset terminals
The BA377NE total display my 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 safety parameters
in normal operation:
Ui = 30V
Uo = 3.8V
Io = 1mA
2.7 Control outputs - optional
Each of the two optional control outputs is a
separate galvanically isolated Ex nA circuit with the
following input parameters:
Ui = 30V dc
Ii = 200mA
This allows each control output to switch any dc
circuit providing that in normal operation the
maximum supply voltage is not greater than 30V dc
and the switched current is not greater than 200mA.
Providing that the BA377NE Timer or Clock is
correctly installed in a panel enclosure located in
Zone 2 complying with the requirements for Ex n
protection, the two control outputs may be used to
switch suitably protected equipment located in Zone
1 or 2 of a hazardous area, or equipment located in
a safe area.

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2.8 Certification label information
The BA377NE product certification 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. Certification information
from other authorities may also be included.
BA377NE Certification information label
3. SYSTEM DESIGN FOR HAZARDOUS AREAS
When correctly installed in Zone 2 the BA377NE
Timer or Clock may be connected to almost any
apparatus in the safe area and to Ex n, Ex e, Ex p
and Ex d protected apparatus located in Zone 2.
Because the BA377NE is not certified intrinsically
safe it should not be connected to an intrinsically
safe system.
BEKA Application Guide AG310, Guide for
Installation of [extra low voltage d.c.] Ex nA
instrumentation, which can be downloaded from
www.beka.co.uk, contains explanations and
recommendations for the installation of Ex nA
equipment.
In addition to being able to be connected to other
equipment in the safe area and in Zone 2, the
BA377NE may also be connected to suitably
protected and certified equipment located in Zone 1.
This is illustrated in Fig 4 and explained in
Application Guide AG310.
There are four design requirements:
1. The BA377NE must be installed in a panel
enclosure complying with the requirements for
Ex n protection as shown in section 4 of this
manual.
2. The BA377NE should be powered from a
circuit that has output safety parameters in
normal operation equal to, or less than, the
input safety parameters for terminals 1 and
2 specified by the BA377NE ATEX Type
Examination Certificate.
3. Hazardous area apparatus to which the
BA377NE is connected should be protected
by a technique suitable for the Zone in
which the equipment is located such as Ex n
or Ex e if located in Zone 2. Equipment
protected by intrinsic safety should not be
connected to a BA377NE.
4. Wiring should comply with Clause 9 of
EN 60079-14.
When designing a system it is important to
remember that terminals 2, 6 and RS2 are
interconnected within the BA377NE.
See Figs 7 & 11.

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3.1 Power supply
The BA377NE Timer or Clock require a minimum of
10V between terminal 1 & 2 and consumes:
10mA without optional backlight
plus 6mA when terminals 3 & 4 are linked
A 24V dc regulated supply with a current limit
located in a safe area is suitable. The power supply
should meet the requirements for personnel safety
so that ‘live maintenance’ can safely be performed.
The implicit requirement for galvanic isolation from
the mains supply ensures that the possible
difficulties from circulating earth currents caused by
mains faults is minimised. In European terms if the
power supply is CE marked it is almost certainly
acceptable.
To comply with the requirements of EN 60079:14
Electrical installations design, selection and
erection, each of the wires entering the hazardous
area should be individually fused and contain a
means of isolation. These two requirements may be
satisfied by using DIN rail mounted terminals
incorporating a fuse with easily removable fuses
which can be extracted to achieve isolation as
shown in Fig 1. Clear identification of, and easy
access to the means of isolation is essential for their
effective use. It is also necessary to ensure that the
maintenance procedure makes sure that
unauthorised re-closure of the switches does not
occur. It is not considered necessary to have a
means of isolation or electrical protection for the
screen.
Fig 1 DIN rail mounting terminals incorporating a
fuse
For some applications Ex nA instrumentation
energised by a current limited power supply or
instrument that can be switched off, is considered
adequate and to comply with the requirements of the
standard.
3.2 Pulse input
The BA377NE can be controlled from a wide variety
of pulse output sensors located in a Zone 2
hazardous areas or in a safe area. Fig 2 shows the
connections when the sensor is located in Zone 2
and Fig 3 the connections required when the sensor
is in a safe area.
Fig 2 Connections for sensor in Zone 2
Fig 3 Connections for sensor in safe area

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Providing the BA377NE Timer or Clock is correctly
installed in an Ex n panel enclosure located in
Zone 2, the input terminals may be connected to a
certified sensor located in Zone 1 as shown in Fig 4.
The sensor should have Ex e or Ex d certification
permitting installation in Zone 1. Intrinsically safe
Ex i certified sensors should not be used.
Fig 4 Connection to an Ex d or Ex e sensor in
Zone 1.
3.2.1 Input switching threshold
For reliable totalisation the Timer or Clock pulse
input must fall below the lower threshold and rise
above the upper thresholds shown in the following
table.
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 contact, proximity detector and open
collector sensors require energising which is
achieved by linking BA377NE terminals 3 and 4.
3.2.2 Switch contact input
Any mechanically or magnetically activated switch
contact located in Zone 2 or in the safe area may be
directly connected to the BA377NE 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.
The BA377NE contain a configurable debounce
circuit to prevent false triggering. See section 6.5.6.
3.2.3 Open collector input
Open collector sensors located in Zone 2 or in the
safe area may be directly connected to input
terminals 5 & 6 providing the sensor and associated
wiring can withstand a 500V rms insulation test to
earth.
The BA377NE contain a configurable debounce
circuit to prevent false triggering. See section 6.5.6.
3.2.4 2-wire proximity detector input
Most Zone 2 certified NAMUR 2-wire proximity
detectors may be directly connected to a BA377NE
input terminals 5 & 6 providing minimum operating
voltage is greater than 7.5V. The sensor and the
associated wiring should be able to withstand a
500V rms insulation test to earth.
The BA377NE contain a configurable debounce
circuit to prevent false triggering. See section 6.5.6.
3.2.5 Magnetic pick-off input
Magnetic pick-offs will usually have a low level ac
voltage output which a BA377NE Timer or Clock can
sense when configured for a CoiL input. The Timer
or Clock input terminals 5 and 6 may be connected
to any Zone 2 certified magnetic pick-off sensor
providing the output in normal operation is less than
30V which is the Ui of the BA377NE. The sensor
and associated wiring should be able to withstand a
500V rms insulation test to earth.
The BA377NE contain a configurable debounce
circuit to prevent false triggering. See section 6.5.6.
3.2.6 Voltage pulse input
Two voltage pulse input ranges are selectable in the
BA377NE Timer or Clock configuration menu, VoLt5
Land VoLt5 H. The Timer or Clock input terminals
5 and 6 may be connected to any Zone 2 certified
voltage pulse, providing the output in normal
operation is equal to or less than 30V and the
sensor and associated wiring are able to withstand a
500V rms insulation test to earth.
The BA377NE contain a configurable debounce
circuit to prevent false triggering. See section 6.5.6.

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3.3 Remote reset
The BA377NE Timer or Clock's total display may be
remotely reset to zero by connecting terminals RS1
and RS2 together. Permanent interconnection
inhibits timing. Remote resetting may be
accomplished by any mechanically operated switch
located in Zone 2 as the Timer or Clock's reset
circuit is non incendive. The reset switch and the
associated wiring should be able to withstand a
500V rms insulation test to earth.
A BA377NE may also be remotely reset from the
safe area. Any switch may be used. Fig 3 illustrates
how a BA377NE may be reset from both the safe
and the hazardous area.
The BA377NE total display may also be reset when
the &and *push buttons are operated
simultaneously in the display mode i.e. when the
instrument is displaying elapsed time. See 6.5.19
3.4 Control outputs (optional)
The BA377NE can be supplied with factory fitted
dual, solid state, single pole control outputs that may
be independently configured with normally open or
normally closed outputs.
CAUTION
Control outputs should not be used for
critical safety applications such as a shut
down system.
When the BA377NE Timer or Clock power supply is
turned off or disconnected, the control outputs will
open irrespective of whether normally open or
normally closed outputs have been selected.
Control output annunciators on the instrument
display indicate the status of each output. If a
control output delay or silence time has been
selected the annunciator will flash during the delay
or silence period.
3.4.1 Solid state output
Each control output has a galvanically isolated
single pole solid state switch output as shown in
Fig 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 = less than 5+ 0.7V
Roff = greater than 1M
Note: Because of the series protection diode some
test meters may not detect a closed control
output.
Fig 5 Equivalent circuit of each control output

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3.4.2 Ex nA certification
Each control output is a separate galvanically
isolated Ex nA circuit with the following input
parameters:
Ui = 30V dc
Ii = 200mA
This allows each control output to switch any dc
circuit providing that in normal operation the
maximum supply voltage is not greater than 30V dc
and the switched current is not greater than 200mA.
Providing that the BA377NE Timer or Clock is
correctly installed in a panel enclosure located in
Zone 2 complying with the requirements for Ex n
protection, the two control outputs may be used to
switch suitably protected equipment located in any
Zone of a hazardous area, or equipment located in a
safe area.
Fig 6 shows a typical application in which a
BA377NE Timer or Clock, mounted in an Ex n panel
enclosure located in Zone 2, is being controlled by a
flameproof Ex d 2-wire sensor located in Zone 1.
Control output 1 is switching an Ex e sounder in
Zone 1 and control output 2 is switching a sounder
located in the safe area.
Fig 6 Typical control output application
(Shown without recommended screened cables)
To comply with the requirements of EN 60079-14
Electrical installations design, selection and
erection, each of the wires entering the hazardous
area should be individually fused and contain a
means of isolation. These two requirements are
frequently satisfied by using fuse holders with easily
removable fuses and removing the fuses to achieve
isolation. This is a satisfactory method at the low
voltages and currents common in instrumentation
systems. Clear identification of, and easy access to
the means of isolation is essential for their effective
use. It is also necessary to ensure that the
maintenance procedure makes sure that
unauthorised re-closure of the switches does not
occur. It is not considered necessary to have a
means of isolation or electrical protection for the
screen. Figure 2 illustrates an example of this type
of fused terminal block.
For some application Ex nA instrumentation
energised by a current limited power supply or
instrument that can be switched off, is often
considered adequate and to comply with the
requirements of the standard.

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4. INSTALLATION
4.1 Location
When installed in a panel enclosure complying with
the requirements for Ex n protection as shown in
section 3.2 of this manual, the BA377NE may be
located in a Zone 2 hazardous area providing that
the operating temperature is between –40°C and
+60°C and the installation complies with the Timer or
Clocks certification requirements. Certified Ex e
panel enclosures are frequently used as Ex n panel
enclosures as they satisfy the same impact and
ingress protection requirements.
The BA377NE Timer or Clock has a stainless steel
housings with a 7J front of panel impact resistance
incorporating a 10mm thick toughened glass window
which can withstand a 4J impact. This, together
with a captive silicone gasket which seals the joint
between the instrument and the panel, enclosure
provides IP66 ingress protection. The BA377NE
has IP20 rear protection which can be increased to
IP66 by an optional A495 rear cover sealing kit.
Although the front of the BA377NE Timer or Clock
has IP66 protection, it should be shielded from
continuous direct sunlight and severe weather
conditions.
Fig 7 shows the overall dimensions of the BA377NE
together with the recommended panel enclosure
cut-out dimensions and terminals.
4.2 Installation Procedure
a. Cut the aperture specified in Fig 7 in the panel
enclosure. Ensure that the edges of aperture are
de-burred.
b. Inspect the Timer or Clock's captive gasket and
ensure that it is not damaged before inserting it
into the panel enclosure aperture.
c. If the enclosure panel is less than 1.0mm thick,
or is non-metallic, an optional BEKA stainless
steel support plate should be slid over the rear of
the indicator before the panel clamps are fitted to
evenly distribute the clamping force and prevent
the enclosure panel being distorted or creeping.
d. Slide a panel clamp into the two grooves at each
corner of the indicator housing with the M3 stud
protruding through the hole at the rear of the
clamp. Fit the stainless steel spring washer over
the stud and secure with the stainless steel wing
nut.
e. Evenly tighten the four clamps to secure the
instrument. The recommended minimum
tightening torque for each wing nut is 22cNm
(1.95 lbf in).
f. Connect the panel enclosure wiring to the rear
terminal blocks. To simplify installation, the
terminals are removable so that wiring can be
completed before the instrument is installed.
Wiring should be supported to prevent damage
resulting from vibration.
g. Finally, fit a silicone rubber push-on cap to the
end of each M3 threaded rod.
Support panel wiring to prevent vibration damage
Note: Optional backlight is internally powered
Fig 7 BA377NE dimensions and terminals

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Fig 8 Installation procedure
4.3 Timer or Clock earthing
The BA377NE has an M4 earth stud on the rear
panel which should be electrically connected to the
panel enclosure in which the Timer or Clock is
mounted, or to the plant equipotential conductor.
4.4 EMC
The BA377NE 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 in the safe area.
Fig 9 Rear terminals without accessories
4.5 Scale card
The BA377NE's units of measurement are shown on
a printed scale card in a window at the right hand
side of the display. The scale card is mounted on a
flexible strip that is inserted into a slot at the rear of
the instrument as shown in Fig 10. Thus the scale
card can easily be changed without removing the
BA377NE from the panel or opening the instrument
enclosure.
New instruments are supplied with a printed scale
card showing the requested units of measurement, if
this information is not supplied when the instrument
is ordered a blank card will be fitted.
A pack of self-adhesive scale cards printed with
common units of flow measurement is available as
an accessory from BEKA associates. Custom
printed scale cards can also be supplied - see 5.3
To change a scale card, unclip the tapered end of
the flexible strip at the rear of the instrument by
gently pushing it upwards and pulling it out of the
enclosure. Peel the existing scale card from the
flexible strip and replace it with a new printed card,
which should be aligned as shown below. Do not fit
a new scale card on top of an existing card.
Install the new scale card by gently pushing the
flexible strip into the slot at the rear of the
instrument, when it reaches the internal end-stop
secure it by pushing the end of the flexible strip
downwards so that the tapered section is held by the
rear panel.
Align the self-adhesive printed scale
card onto the flexible strip and insert
the strip into the instrument as shown
below.
Fig 10 Inserting the flexible strip carrying the scale
card into slot at the rear of the instrument.

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5. ACCESSORIES
5.1 Display backlight
The BA377NE Timer and Clock can be supplied with
a factory fitted backlight that produce green
illumination enhancing display contrast and enabling
it to be read at night or in poor lighting conditions.
The backlight is internally powered from the
instrument power supply so no additional field wiring
is required, but the supply current increases as
shown below.
BA377NE
current
consumption
Without backlight 10mA
Additional for backlight 22mA
Addition with terminals 3 & 4 linked 6mA
---------------
Total current 38mA max
5.2 Control outputs
Although the dual isolated control outputs are
factory fitted options, they are described in the main
body of this instruction manual as they will be used
for the majority of applications. If control outputs are
required they should be specified when the
instrument is ordered.
5.3 Scale card
The BA377NE has a window on the right hand side
of the display through which a scale card showing
the units of measurement such as hours can be
seen. New instruments are fitted with a scale card
showing the units of measurement specified when
the instrument was ordered, if the units are not
specified a blank scale card will be fitted. A pack of
scale cards pre-printed with common units of
measurement is available as an accessory. These
can easily be fitted on-site without opening the
instrument enclosure or removing it from the panel.
See section 4.5 of this instruction manual.
Custom scale cards for applications requiring less
common units of measurement are also available.
5.4 Tag information
New instruments can be supplied with a tag number
or application information printed onto the rear panel
adjacent to the terminals. This information is not
visible from the front of the instrument after
installation.
5.5 Rear cover sealing kit
The BA377NE Timer or Clock’s rear of panel ingress
protection can be increased from IP20 to IP66 with a
BA495 rear cover sealing kit. Manufactured from
316 stainless steel the cover incorporates two M20
unthreaded entries for cable glands.
Note:
The BA495 rear cover sealing kit provides additional
rear impact and ingress protection but it is not Ex nA
certified. Therefore the BA377NE Timer or Clock
must still be mounted within an Ex nA, Ex e or Ex p
enclosure as described in section 4 of this manual to
comply with Ex nA certification requirements.

15
6. OPERATION AS A TIMER
When configured as a Timer the BA377NE can
measure and display the elapsed time between
external events such as measuring and displaying
how long machinery is operating. The Timer can be
started and stopped by a remote sensor, or from the
front panel push buttons.
The addition of two optional factory fitted isolated
control outputs allows the Timer to control external
events such as opening a valve for a predetermined
time. Again the Timer can be started and stopped
by a remote sensor, or from the front panel push
buttons.
When controlling external events the CYCLE function
enables the BA377NE Timer to be configured to
repeat the timing period up to 99 times with a
configurable delay between timed periods up to 100
hours or to repeat continuously.
The BA377NE may be configured to time-up from
zero to the set time 5Et t,ortotime-down from the
set time to zero. The set time may be entered and
displayed in hours, minutes or seconds, or a
combination of units. Elapsed or remaining time is
continuously displayed and a separate display may
be activated to show the Timer set time 5Et t.
Resetting the timer cycle can be accomplished via
the front panel push buttons or by a remote contact.
A grand total time is maintained which can be
viewed by operating the front panel push buttons. It
may be reset to zero from within the configuration
menu, or the instrument may be configured to allow
resetting from the front panel push buttons.
Fig 11 shows a simplified block diagram of the
BA377NE when configured as a Timer. The input
can be configured to accept inputs from a wide
variety of sensors. When the sensor requires
energising, such as a switch contact, open collector
or a two wire proximity detector, a link connected
between terminals 3 & 4 supplies power to the
sensor input.
The instrument can be supplied with the following
factory fitted accessories:
Internally powered Backlight
Dual isolated Control Outputs
Thetwofactoryfittedsolidstateisolatedcontrol
outputs may be independently configured to close
and open at specified parts of the timer cycle, such
as when the timer starts or finishes.
6.1 Initialisation
Each time power is applied to a BA377NE
initialisation is performed. After a short delay the
following display sequence occurs:
All segments of the display are activated
BA377NE is ready to start functioning using
the configuration information stored in the
instrument's permanent memory.
Fig 11 BA377NE block diagram with Timer
configuration.

16
6.2 Controls when configured as a Timer
The BA377NE is controlled and configured via four
front panel push buttons. In the display mode i.e.
when the instrument is displaying time the push
button functions are:
Push Button Functions
&When local control is enabled starts
the Timer. See 6.5.8
*When local control is enabled stops
the Timer. See 6.5.8
)+ *Shows the grand total (run time) in
hours and tenths of an hour
irrespective of Timer configuration.
If buttons are held for longer than
ten seconds the grand total may be
reset to zero if the grand total reset
sub-function clr gtot is enabled in
the LoC r5Et configuration function.
See 6.5.20
To reset the grand total to zero from
the display mode press the
)+*buttons for ten seconds
until CLr.no is displayed, using the
&or *button change the display
to CLr.YE5 and press ).
&+ *Resets the Timer to zero or to the
set time 5Et t depending on
whether the Timer is configured to
time-up or time-down when the two
buttons are operated
simultaneously for more than two
seconds. This is a configurable
function. See 6.5.19
(+ *When enabled in the configuration
menu, operating these two buttons
simultaneously provides direct
access to the set time 5Et t and
allows adjustment when the timer is
in the display mode. See 6.5.15
(+ &Shows in succession, firmware
version number, instrument function
elap5e and any output accessories
that are fitted:
-A Dual Control Outputs
(+ )Access to configuration menu
6.3 Displays when configured as a Timer
The BA377NE has two digital displays and
associated annunciators as shown on front cover of
this manual.
Elapsed time The upper display shows the
elapsed time since the Timer
was started when timing-up from
zero and the remaining time
when timing-down from the set
time. The display may be
formatted as hh:mm:ss; hh:mm;
mm:ss or ss.
Lower display The display options available on
the lower display depend on
whether the Timer repeat cycle
function CYCLE5, which can
repeat the timing period up to 99
times, or continuously with a
configurable delay between
periods, is enabled.
CYCLE5 disabled
The lower display shows the set
time 5ET t, or the lower display
may be disabled if not required.
See 6.5.7
CYCLE5 enabled
The lower display shows the
total number of repeat cycles
requested together with the
number of the current cycle.
Each operation may be briefly
named at it's start or periodically
throughout the cycle.
The lower display may also be
disabled if not required.
See 6.5.7
Reset Activated while elapsed time is
annunciator being reset to zero or to the set
time 5ET t.
Grand total Activated when the grand total
annunciator time is being shown on the
upper display.
Control output Show status of both optional
annunciators control outputs.

17
6.4 Timer structure
Fig 12 illustrates the Timer structure and function as
a state diagram. It applies when the instrument is
measuring the time between events or is controlling
external events.
The circles in Fig 12 represent the five Timer states,
Reset,Running, Restart-delay, Paused and
Complete. The lines between the circles represent
the event required to move the Timer between
states. e.g. to initiate timing the Timer is moved
from the Reset state to the Running state by a start
event. This could be an input signal or operation of
the &button. Similarly, to pause the Timer while it
is timing, the Timer must be moved from the
Running state to the Pause state by a stop event
which could be an input or operation of the *
button.
Reset
In this state the Timer is readied for operation.
The Timer is stopped and loaded with zero for
timing-up or 5Et t for timing-down.
Running
Entered by a start event from the Reset or
Paused states. The Timer times-up to 5et t
or times-down to zero depending upon it's
configuration.
Pause
Entered by a stop event from Running or
Restart-delay. Timer is stopped, a start event
returns the timer to it's previous state.
Restart-delay
Entered automatically from Running. At the
end of the delay time automatically returns to
Running.
Complete
Entered automatically from Running when
there are no more timing cycles to perform.
When the CYCLE5 function is enabled the timing
cycle can be repeated a specified number of times,
or continuously.

18
6.5 Configuration as a Timer
The BA377NE is configured via the four front panel
push buttons. All the configuration functions are
contained in an easy to use intuitive menu that is
shown diagrammatically in Fig 13.
Each menu function is summarised in section 6.5.2
of this manual and each summary includes a
reference to more detailed information.
All new BA377NE instruments are supplied
configured as requested at the time of ordering. If
configuration is not requested, the BA377NE will be
supplied with default Timer configuration as shown
below, but the instrument can easily be re-
configured on-site.
Function Display Default
Access code CodE 0000
Function FunCtion ELAP5E
Input inPut oP .CoL
Debounce dEbounCE dEFAuLt
Display 2 di5P-2 5td
Start stop 5tAr5toP LoCAL
Units unit5 12 :00 :00
Set time 5Et t 00 :00 :00
Enable repeat cycle CYCLE5 oFF
Access set time from AC5Et t oFF
display mode.
Direction of count uP or dn dn
Recovery from power p-fail idle
supply failure.
Local total reset t-rE5Et on
Local grand total reset Gt-rE5Et oFF
External reset E-r5et 5td
Enable control output 1 *EnbL oFF
Enable control output 2 *EnbL oFF
* Optional output
6.5.1 Accessing configuration functions
Throughout this manual front panel push buttons are
shown as &,*,(and )and legends
displayed by the instrument are shown in a seven
segment font just as they appear on the instrument
e.g. inPut and Clr Gtot.
Access to the configuration menu is obtained by
operating the (and )push buttons
simultaneously. If the instrument is not protected by
an access security code the first parameter
FunCtion 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 FunCtion 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 main configuration menu the
required function can be selected by scrolling
through the menu using the &or *push button.
The Timer configuration menu is shown
diagrammatically in Fig 13.
When returning to the display mode following
reconfiguration, the Timer will display dAtA followed
by 5AVE while the new information is stored in
permanent memory.

19
6.5.2 Summary of Timer configuration
functions
This section summarises all the Timer configuration
functions. When read in conjunction with Fig 13 it
provides a quick aid for configuring the Timer. If
more detail is required, each section of this
summary contains a reference to a full description of
the function.
Display Summary of function
FunCtion Instrument function
Defines the function of the instrument.
May be set to:
ELAP5E Timer configuration
CloC Clock configuration
All the entries in this Timer summary
assume that the BA377NE is
configured as a Timer by selecting
ELAP5E.
See section 6.5.3
inPut Configuration of Input
Contains a sub-menu with two sub-
functions:
inP .tYPE Selects input sensor type
dEbounCE Defines input debounce
See section 6.5.4
inP .tYPE
Configures the Timer sensor input 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 
Energise input by linking terminals
3 & 4.
See section 6.5.5
dEbounCE
Defines the level of debounce applied
to the input to prevent false
functioning:
dEFAuLt
HEAVY
LiGHt
See section 6.5.6
Display Summary of function
di5P-2 Lower display
Configures the lower display to show
set time 5Et t or, when the CYCLE5
repeat function is activated, the restart
delay count-down plus the cycle count
number.
With CYCLE5 not enabled:
Select Lower display shows
5td Set time 5et t
oFF Disables lower display.
See section 6.5.7
With CYCLE5 enabled:
Select Lower display shows
5td Cycles requested and
cycles performed with
time-down shown during
requested delay period.
Brief notification of timer
status i.e. CYCLE or
dELAY at start of each
period.
LAbEL Exactly as 5td but with
periodic notification of
timer status i.e. CYCLE or
dELAY.
oFF Disables lower display.
See section 6.5.7
5tAr5toP Starting and stopping the timer
Defines how the Timer is started and
stopped.
Start Stop
LoCAL & button *button
ControL 1 Input high Input low
ControL 2 Input low Input high
High and low inputs are specified for a
voltage input. For other types of
sensor input.
See section 6.5.8

20
Display Summary of function
unit5 Units of display
Selects displayed units.
12 :00 :00 Hours, minutes & seconds
12 :00 Hours & minutes *
30 :00 Minutes & seconds
30 Seconds
Excludes delay of optional control
outputs which is always shown in
seconds and the grand total which is
always shown in hours.
*Only available if 5et t and r5t dELA ,
if already entered, specify zero
seconds or seconds which are exactly
divisible by sixty.
See section 6.5.9
5Et t Set time
When controlling an external event via
the optional control outputs the
BA377NE will time-down from the set
time to zero or time-up from zero to the
set time.
Note: Timer will only start if a non zero
value is entered for set time 5et t.
See section 6.5.10
CYCLE5 Repeat timing cycle
Contains a sub-menu with three
sub-functions, EnbL,CYCL Cnt and
r5t dELA.
See section 6.5.11
Cycle function enable EnbL
Enables or disables the cycle5
function without changing the
parameters.
See section 6.5.12
Cycle count CYCL Cnt
Defines the number of times that the
timer cycle is repeated.
See section 6.5.13
Restart delay r5t dELA
Defines the time delay between timer
cycles.
See section 6.5.14
AC5Et t Access 5Et t and r5t dela from
display mode.
Enables 5Et t and r5t dela to be
adjusted from the display mode. Also
contains a sub-function ACCd which
defines a separate code to protect
access from the display mode to 5Et t
and r5t dela .
See section 6.5.15
Display Summary of function
uP or dn Direction of count
Defines whether the Timer times-down
from 5Et t' to zero or times-up from
zero to the set time 5Et t.
See section 6.5.16
P-FAiL Power Failure
Defines how the Timer functions when
power is restored after a power failure.
Contains three sub-functions idle,
Pau5E and continue.
idle Timer returns in stopped state
as if having completed a
single timing cycle displaying
Timer value when power was
lost. Timing resumes when
reset followed by start
instructions are received.
Pau5e Timer returns in paused state
displaying Timer value when
power was lost. Timing
resumes when start
instruction is received.
Continue Timer will continue without
any manual intervention.
See section 6.5.17
LoC r5Et Local reset
Contains two sub-functions which
when enabled allow the Timer and the
grand total, which represents total
Timer run-time, to be reset to zero via
the front panel push buttons while the
Timer is in the display mode.
See section 6.5.18
Local total reset r5Et.EnbL
When on is selected, Timer is reset to
zero, or 5et t if timing-down, when the
&and *buttons are operated
simultaneously for more than 2
seconds in the display mode.
See section 6.5.19
Local grand total reset CLr Gtot
When on is selected the grand total,
which represents total run-time, may
be reset to zero by operating the
)+*buttons simultaneously for
more than 10 seconds in the display
mode.
Note: Once reset, the grand total can
not be recovered.
See section 6.5.20