BEKA BA377E-SS User manual

Issue: 6
4th May 2021
BA377E-SS
Rugged one input
intrinsi ally safe
Timer or Clo k
Issue 6

2
1. DESCRIPTION
2. INTRINSIC SAFETY CERTIFICATION
2.1 ATEX gas certification
2.2 Zones, gas groups and T rating
2.3 Special conditions for safe use
2.4 Po er supply
2.5 Input terminals
2.5.1 Sensors that do not require
energising.
2.5.2 Sensors that require energising
2.6 Remote reset terminals
2.7 Control outputs - optional
2.8 Certification label information
3. SYSTEM DESIGN FOR HAZARDOUS AREAS
3.1 Use ith Zener barriers
3.1.1 Po er supply
3.1.2 Sensor inputs
3.1.3 S itch contact input
3.1.4 Open collector input
3.1.5 2- ire proximity detector input
3.1.6 Magnetic pick-off input
3.1.7 Voltage input
3.1.8 Remote reset
3.1.9 Control outputs - optional
3.2 Use ith Galvanic Isolators
3.2.1 Po er supply
3.2.2 Sensor inputs
3.2.3 S itch contact input
3.2.4 Open collector input
3.2.5 2- ire proximity detector input
3.2.6 Magnetic pick-off input
3.2.7 Voltage input
3.2.8 Remote reset
3.2.9 Control outputs - optional
3.3 Use in an Ex e or Ex p panel enclosure in
Zone 1 or Zone 2.
3.3.1 Installation in an Ex e panel
enclosure ithin Zone 1 or Zone 2.
3.3.2 Installation in an Ex p panel
enclosure ithin Zone 1 or Zone 2.
4. INSTALLATION
4.1 Location
4.2 Installation procedure
4.3 EMC
4.4 Timer or clock earthing
5.5 Scale card
5. ACCESSORIES
5.1 Display backlight
5.2 Control outputs
5.3 Scale card
5.4 Tag information
5.5 BA495 rear sealing kit
6. OPERATION AS A TIMER
6.1 Initialisation
6.2 Controls hen configured as a Timer
6.3 Displays hen 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 Lo er 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 Po er 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 ithin the
configuration menu: Clr Gtot
6.5.28 Security code: CodE
6.5.29 Reset configuration to Timer
factory defaults: r5Et dEF
7. TIMER APPLICATION EXAMPLES
7.1 Measuring the time that a contact is closed
7.2 Controlling an IS solenoid valve
CONTENTS
The BA377E-SS is CE marked to sho compliance ith the European Explosive Atmospheres Directive
2014/34/EU and the European EMC Directive 2014/34/EU

3
8 MAINTENANCE when onfigured 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 po er
9.2 Controls hen configured as a clock
9.3 Displays hen 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 onfigured as a Clo k
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 ATEX Dust certification
Appendix 2 IECEx certification
Appendix 3 ETL and cETL certification

4
1. DESCRIPTION
The BA377E-SS is a rugged intrinsically safe, panel
mounting instrument ith a single input that can be
configured as a Timer or as a Clock. As a Timer the
BA377E-SS is able to measure and display the
elapsed time bet een external events, or control
external events via t o optional factory fitted control
outputs.
When configured as a Clock, the instrument can
display time in a variety of formats and the t o
optional control outputs may be configured to s itch
loads on and off at pre-set times.
This instruction manual is divided into sections.
Common features
2. Intrinsic safety certification
3. System design for hazardous areas
4. Installations
5. Accessories
Timer
6. Operation as a timer
7. Configuration example
8. Maintenance
Clo k
9. Operation as a clock
10. Configuration example
11. Maintenance
The BA377E-SS has been certified intrinsically safe
for use in gas and dust hazardous areas by Notified
Body Intertek Testing and Certification Ltd and
complies ith the European ATEX Directive 2014/34/
EU. It has a rugged stainless steel enclosure and an
impact resistant glass indo . In addition to normal
intrinsically safe applications, the certification allo s
it to be installed in an Ex e, Ex n, Ex p or Ex t panel
enclosure ithout invalidating the panel enclosure's
certification.
The common features sections of this instruction
manual describe ATEX certification for use in gas
atmospheres. Dust certification is described in
Appendix 1.
For international applications the BA377E-SS has
IECEx certification hich is described in Appendix 2.
This instruction manual supplements the abbreviated
instruction sheet supplied ith each instrument.
2. INTRINSIC SAFETY CERTIFICATION
The BA377E-SS has IECEx and ATEX gas
certification. This section of the instruction manual
describes ATEX gas certification. IECEx and other
approvals are each described in separate
appendixes to this manual. The intrinsic safety of
the instrument is unaffected by hether it is
configured as a Timer or as a Clock.
2.1 ATEX gas ertifi ation
Notified Body Intertek Testing and Certification Ltd
have issued the BA377E-SS ith an EU-Type
Examination Certificate number ITS16ATEX28408X.
This confirms compliance ith harmonised European
standards and it has been used to confirm
compliance ith the European ATEX Directive for
Group II, Category 1G equipment. The Timer or
Clock carries the European 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 S itzerland.
This section of the instruction manual describes
ATEX installations in explosive gas atmospheres
complying ith EN60079-14 Electrical Installation
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 BA377E-SS Timer or Clock 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
ill only exist for a short time.
In gases that may be used ith equipment having a
temperature classification of:
Group A propane
Group B ethylene
Group C hydrogen
Having a temperature classification of:
T1 450ºC
T2 300ºC
T3 200ºC
T4 135ºC
T5 100ºC

5
At ambient temperatures bet een:
-40 to +60oC When installed as an Ex i
intrinsically safe instrument in
an Ex e, Ex n, Ex p or Ex t
enclosure.
-40 to +70oC When used as an Ex i
intrinsically safe instrument
not in an Ex e, Ex n, Ex p or
Ex t enclosure.
2.3 Spe ial onditions for safe use
The ATEX intrinsic safety certificate number has an
‘X’ suffix indicating that for some applications special
conditions apply for safe use.
When installed in an Ex e, Ex n, Ex p or Ex t
panel enclosure all connections to the
BA377E-SS must e made y appropriately
rated Zener arriers or galvanic isolators.
This means that hen installed in an Ex e, Ex n,
Ex p or Ex t panel enclosure the BA377E-SS
remains an intrinsically safe instrument and must
comply ith the installation requirements sho n in
this manual.
The certificate also states:
The front of the stainless steel enclosure
complies with the requirements for Ex e, Ex n
Ex p & Ex t type of protection.
Therefore hen correctly installed the BA377E-SS
Timer or Clock ill not invalidate the Ex e, Ex n, Ex p
or Ex t panel enclosure certification in hich it is
mounted.
Note: At temperatures belo -20°C the
instruments ill continue to function, but the display
response ill become slo er and the contrast ill be
reduced.
2.4 Power supply
When installed in a hazardous area the BA377E-SS
must be po ered via a certified Zener barrier or
galvanic isolator from a dc supply located in the safe
area, or from certified associated apparatus ith an
intrinsically safe output.
The input safety parameters of the BA377E-SS
po er supply terminals 1 and 2 are:
Ui = 28V dc
Ii = 200mA dc
Pi = 0.84W
Any certified Zener barrier or galvanic isolator ith
output safety parameters equal to or less than these
limits may be used to po er the BA377E-SS.
The maximum equivalent capacitance and
inductance bet een terminals 1 and 2 is:
Ci = 2nF
Li = 4µH
To determine the maximum permissible po er
supply cable parameters the above figures, hich
are small and may be ignored for many applications,
should be subtracted from the maximum permitted
parameters, Co and Lo, specified for the Zener
barrier or galvanic isolator po ering the BA377E-
SS.
2.5 Input terminals
When configured as a Timer the BA377E-SS is
controlled via a single input that may be configured
for use ith different types of sensor. The input is a
separate intrinsically safe circuit, although the
negative side is internally connected to the negative
side of the po er supply and the reset terminal RS2.
See Fig 15.
Some types of sensor that may be connected to the
BA377E-SS input, such as a s itch contact or a 2-
ire proximity detector, require energising to
determine their state. For sensors requiring
energising fitting an external link bet een terminals 3
& 4 connects an internal 7V, 6mA supply to the input.
Energising is not required hen the BA377E-SS
input is connected to a voltage input source.
Fitting an energising link changes the output safety
parameters of the BA377E-SS input as sho n in the
follo ing table hich also sho s the types of sensor
requiring energising (link fitting).
Output safety parameters of
input terminals 5 & 6.
Type of input Link* Uo Io Po
S itch contact Yes 10.5V 8.2mA 25mW
Proximity detector Yes 10.5V 8.2mA 25mW
Open collector Yes 10.5V 8.2mA 25mW
Magnetic pick-off No 1V 11µA 3µW
Voltage input (lo ) No 1V 11µA 3µW
Voltage input (high) No 1V 11µA 3µW
*Link terminals 3 and 4

6
2.5.1 Sensors that do not require energising
Sensors ith a voltage output do not require
energising, therefore terminals 3 & 4 should not be
linked. When not energised i.e. ithout a link the
BA377E-SS input complies ith the requirements for
simple apparatus. For intrinsic safety purposes,
sources of energy ith output parameters less than
1.5V; 100mA and 25mW are considered to be simple
apparatus (Clause 5.7 of EN60079-11), hich allo s
them not to be considered or documented hen
assessing the safety of an intrinsically safe system,
thus simplifying loop assessment.
This allo s almost any voltage output sensor to be
directly connected to the BA377E-SS 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 ith requirements for
simple apparatus.
b. The sensor and associated iring can
ithstand a 500V rms insulation test to earth.
c. The sensor is located in the same hazardous
area as the BA377E-SS.
The BA377E-SS EC-Type Examination Certificate
specifies that the equivalent capacitance and
inductance of the BA377E-SS sensor 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 BA377E-SS input terminals. The
BA377E-SS input parameters are small and
therefore unlikely to make a significant difference to
the allo able cable parameters.
2.5.2 Sensors that require energising
S itch contacts, proximity detectors and open
collector sensors require energising hich is
achieved by linking t o BA377E-SS terminals
together as described in section 2.5. When
energised, the output parameters of the BA377E-SS
input are:
Uo = 10.5V dc
Io = 8.2mA dc
Po = 25mW
These parameters do not comply ith the
requirements for simple apparatus and should be
considered hen assessing the safety of the sensor
connected to a BA377E-SS input.
Any certified intrinsically safe sensor may be
connected to the BA377E-SS energised input
providing that the sensor's input safety parameters
are equal to, or greater than, the output safety
parameters of the BA377E-SS input sho n above.
This is not restrictive and most intrinsically safe
sensors ill comply. A sensor complying ith the
requirements for simple apparatus, such as a
mechanically operated s itch contact, may also be
connected.
This allo s most mechanically operated s itches,
open collector transistors and certified intrinsically
safe NAMUR proximity detectors to be directly
connected to the BA377E-SS energised input. The
sensor and iring should be able to ithstand a
500V rms insulation test to earth and the sensor
should be located in the same hazardous area as the
BA377E-SS.
The BA377E-SS EC-Type Examination Certificate
specifies that the maximum capacitance and
inductance that may be safely connected to the
energised input (link connected) is:
Co = 2.4µF
Lo = 200mH
Again this is not restrictive as the combined
capacitance and inductance of most sensors and
connecting cable ill be less than this.

7
2.6 Remote reset terminals
Connecting the external reset terminals RS1 and
RS2 together ill reset the BA377E-SS hen
configured as a Timer and synchronise the displayed
time hen configured as a Clock. The t o reset
terminals have the follo ing input and output safety
parameters:
Uo = 3.8V dc
Io = 1.6mA dc
Po = 2.0mW
Ui = 28V dc
Ii = 200mA dc
Pi = 0.84W
The equivalent capacitance and inductance bet een
them is:
Ci = 0nF
Li = 0µH
The maximum cable capacitance and inductance
that may be safely connected bet een the reset
terminals RS1 and RS2 is:
Co = 40µF
Lo = 1H
The reset terminals may be directly connected to any
mechanically operated s itch located ithin the
same hazardous area as the BA377E-SS. The
s itch and associated iring should be able to
ithstand a 500V insulation test to earth.
If the reset s itch is required in the safe area a
Zener barrier or intrinsically safe relay is required to
transfer the contact closure into the hazardous area.
A diode return barrier is not suitable for this
application. Almost any intrinsically safe relay ith
certification permitting the contacts to be connected
to equipment in the hazardous area may be used.
When used as a Timer the BA377E-SS may also be
reset from the display mode by operating the & and
push buttons simultaneously for more than t o
seconds. See 6.5.19
2.7 Control outputs - optional
Each of the t o factory fitted optional control outputs
is a separate galvanically isolated intrinsically safe
circuit ith output safety parameters complying ith
the requirements for simple apparatus. This allo s
the control output terminals A1 & A2 and A3 & A4 to
be connected to almost any intrinsically safe circuit
protected by a Zener barrier or galvanic isolator
providing the output safety parameters of the circuit
do not exceed:
Uo ≤ 28V dc
Io ≤ 200mA dc
Po ≤ 0.84W
The maximum equivalent capacitance and
inductance bet een each set of control output
terminals is:
Ci = 22nF
Li = 8µH
To determine the maximum permissible cable
capacitance Ci should be subtracted from the
maximum permitted external capacitance Co
specified by the certificate for the intrinsically safe
interface po ering the circuit being s itched by the
control output. See fig 4.

8
2.8 Certifi ation label information
The BA377E-SS product certification label is fitted in
a recess on the top outer surface of the enclosure. It
sho s 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.
BA377E-SS Certification information label
3. SYSTEM DESIGN FOR HAZARDOUS
AREAS
3.1 Use with Zener barriers
Zener barriers are the least expensive intrinsically
safe interface bet een a safe and hazardous area.
Ho ever, 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 BA377E-SS.
Terminals 2, 6 and RS2 of the BA377E-SS are
internally connected together as sho n in Fig 15. If
any of these terminals are earthed, as sho n in
Figs 1 & 2, the other common terminals should only
be connected to the same earth, i.e. the barrier
busbar, or to circuits that have at least 500V
insulation to earth.
Any Zener barrier certified for the gas group and
Zone in hich the BA377E-SS is installed may be
used, providing the output parameters do not exceed
the input parameters of the BA377E-SS terminals to
hich it is connected. Only one polarity of Zener
barrier i.e. positive or negative may be used in each
system.
Fig 1 illustrates the basic circuit that is used for all
BA377E-SS Timer installations protected by Zener
barriers. BA377E-SS Clock installations are the
same, except that the input terminals 5 & 6 are not
used. For simplicity the optional control outputs are
described separately in section 3.1.9 of this manual.
Fig 1 BA377E-SS Timer used ith Zener barriers
Alternatively the sensor may be located in the safe
area. Fig 2 sho s ho an additional Zener barrier is
used to transfer signals to the Timer in the
hazardous area.

9
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
Timer system it is important to remember that
terminals 2, 6 and RS2 of the BA377E-SS are
connected together ithin the instrument. Similarly,
terminals 2 and RS2 are internally connected
together hen the BA377E-SS is configured as a
Clock. See Fig 20.
Fig 2 BA377E-SS Timer used ith Zener barriers
and input sensor in the safe area.
3.1.1 Power supply
The BA377E-SS requires a minimum of 10V
bet een terminal 1 & 2 and consumes:
10mA ithout optional backlight
plus 22mA for optional backlight
plus 6mA hen terminals 3 & 4 are linked
Any Zener barrier certified for the gas group and
Zone in hich the BA377E-SS is installed may be
used to po er the instrument, providing the output
safety parameters of the barrier are equal to or less
than the input safety parameters of terminals 1 & 2.
Although this allo s a ide variety of barriers to be
used, a positive polarity 28V; 93mA; 300 Zener
barrier, hich has an end-to-end resistance of about
340, is an industry standard device hich is
frequently used. With this barrier the supply voltage
in the safe area must be bet een the minimum value
sho n belo and the maximum orking voltage of
the Zener barrier hich, depending upon
manufacturer, ill be approximately 26V.
13.5V min ithout optional backlight
20.9V min ith optional backlight
plus 2.1V hen terminals 3 & 4 are linked
3.1.2 Sensor input
When configured as a Timer the sensor input may be
connected to a ide variety of hazardous area
devices as sho n in Fig 1, or to safe area sensor as
sho n in Fig 2. The input must be maintained not
momentary. The BA377E-SS input is not used hen
the instrument is configured as a Clock.
No Zener barrier is required in series ith the input if
the intrinsically safe sensor is located ithin the
same hazardous area as the BA377E-SS. The
follo ing table sho s the instrument's input
s itching thresholds hen configured to operate ith
various sensors. For reliable operation the BA377E-
SS input must fall belo the lo er threshold and rise
above the upper threshold.
Sensor Swit hing thresholds
Lower Upper
Low voltage range 1.0V 3.0V
High voltage range 3.0V 10.0V
Proximity dete tor 1.2mA 2.1mA
Swit h 1001000
Open olle tor 2k10k
S itch contacts, proximity detectors and open
collector sensors require energising hich is
achieved by linking terminals 3 and 4 together as
described in section 2.5.
3.1.3 Swit h onta t input
Any mechanically activated s itch contact may be
directly connected to input terminals 5 & 6 providing
the s itch is located in the same hazardous area as
the BA377E-SS, and the s itch and associated
iring can ithstand a 500V rms insulation test to
earth. Most industrial push buttons and magnetically
activated reed relays comply ith these
requirements. The BA377E-SS contains a
configurable debounce circuit to prevent false
triggering of the instrument. Three levels of
debounce protection are available. See
section 6.5.6.
3.1.4 Open olle tor input
Any sensor ith an open collector output located in
the same hazardous area as the BA377E-SS, such
as a mechanically activated opto-isolator may be
directly connected to input terminals 5 & 6. The
sensor and the associated iring must be able to
ithstand a 500V rms insulation test to earth. The
BA377E-SS contains a configurable debounce circuit
to prevent false triggering. Three levels of debounce
protection are available. See section 6.5.6.

10
3.1.5 2-wire proximity dete tor input
Most intrinsically safe NAMUR 2- ire proximity
detectors may be connected to the BA377E-SS
sensor input, providing the input safety parameters
of the proximity detector are equal to or greater than
the output safety parameters of a BA377E-SS input.
i.e.
Ui ≥ 10.5V dc
Ii ≥ 8.2mA dc
Pi ≥ 25mW
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
BA377E-SS.
The BA377E-SS contains a configurable debounce
circuit to prevent false triggering of the instrument.
Three levels of debounce protection are available.
See section 6.5.6.
3.1.6 Magneti pi k-off input
CoiL in the input configuration menu is a lo level
voltage input intended for use ith an intrinsically
safe magnetic pick-off sensor hich is not suitable
for controlling a BA377E-SS.
3.1.7 Voltage input
T o voltage input ranges are selectable in the
BA377E-SS Timer configuration menu, VoLt5 L and
VoLt5 H. When configured for either of the voltage
ranges and terminals 3 and 4 are not linked, the
input terminals 5 and 6 comply ith the requirements
for simple apparatus. This allo s the input to be
connected to any certified intrinsically safe voltage
source located ithin the same hazardous area as
the BA377E-SS having output parameters equal to
or less than:
Uo ≤ 28V dc
Io ≤ 200mA dc
Po ≤ 0.84W
The BA377E-SS Timer may therefore be directly
connected to and controlled by most certified
intrinsically safe high level voltage signals.
The maximum permitted cable parameters ill be
defined by the intrinsic safety certification of the
voltage source less the BA377E-SS input
parameters hich are small and can often be
ignored.
The BA377E-SS contains a configurable debounce
circuit to prevent false triggering of the instrument.
Three levels of debounce protection are available.
See section 6.5.6.
3.1.8 Remote reset
Connecting the external reset terminals RS1 and
RS2 together ill reset the BA377E-SS hen
configured as a Timer and synchronise the displayed
time hen configured as a Clock. Remote resetting
may be accomplished by any mechanically operated
s itch located in the same hazardous area as the
instrument providing the s itch and the associated
iring can ithstand a 500V rms insulation test to
earth. No Zener barrier is required.
A BA377E-SS may also be remotely reset from the
safe area. Any s itch may be used but a Zener
barrier is required to transfer the contact closure into
the hazardous area hich may be combined ith the
supply barrier so that only one package is required.
A diode return barrier is not suitable for this
application. Fig 1 illustrates ho a BA377E-SS may
be reset from both the safe and the hazardous area.
Note: When used as a Timer the BA377E-SS may
also be reset from the display mode by operating the
& and push buttons simultaneously for more
than t o seconds. See 6.5.19