BEKA AG390 Intrinsically safe LED Panel Lamps User Guide
- June 9, 2024
- BEKA
Table of Contents
associates
APPLICATION GUIDE AG390
Intrinsically safe LED Panel Lamps
Introduction
This application guide describes the use and installation of BA390 and BA390S intrinsically safe LED panel lamps. It also describes the general purpose non- certified 24V BA590 panel lamp for use in non-hazardous areas.
Description
There are three types of panel lamp in this range:
BA390X Certified intrinsically safe lamp that draws a constant 20mA from
an intrinsically safe voltage source.
BA390XS Certified intrinsically safe low current lamp which requires an
external current regulator.
BA590X General purpose panel lamp for use in non-hazardous safe areas.
Draws a constant 20mA from a 14 to 30V dc supply.
Each type of panel lamp is available in five well defined colours indicated by
the model number suffix.
| Intrinsically safe| Safe area
---|---|---
Colour| 20mA lamp| Low current lamp| 20mA lamp
Red| BA390R| BA390RS| BA590R
Green| BA390G| BA390GS| BA590G
Amber| BA390A| BA390AS| BA590A
Blue| BA390B| BA390BS| BA590B
White| BA390W| BA390WS| BA590W
2.1 BA390X panel lamps
These panel lamps contain a 20mA constant current regulator and therefore draw
a fixed current and have constant brilliance irrespective of supply voltage
variations. They have IECEx and ATEX gas and dust intrinsic safety
certification and FM gas intrinsic safety and nonincendive
certification.
Fig 1 shows the equivalent circuit of a BA390X panel lamp. When the supply voltage to the lamp exceeds the minimum operating voltage of 14V the lamp will draw a onstant current between 18 and 22mA and the lamp brilliance will be constant. Table 1 shows the typical illuminance from different colour BA390 lamps.
Fig 1 Equivalent circuit of BA390X
Below the minimum supply voltage the lamp will have a reduced brilliance and below a voltage which varies with the lamp’s colour, it will not be illuminated.
Colour | Red | Green | Amber | Blue | White |
---|---|---|---|---|---|
Output lux | 163 | 231 | 235 | 530 | 273 |
Table 1 Typical BA390X illuminance in lux 15cm from the lamp.
2.2 BA390XS panel lamps
This range of panel lamps are optimised for operation at low currents, if
powered from a voltage source they require an external current regulator such
as a series resistor or electronic current regulator. They are intended for
low current applications or where it is required to vary the lamp brightness.
They have IECEx and ATEX gas and dust intrinsic safety certification and FM
gas intrinsic safety and nonincendive certification.
Fig 2 shows the equivalent circuit of a BA390XS panel lamp. The lamp
brilliance is proportional to the input current as shown in Table 2.
Current mA|
BA390XS colour
---|---
Red| Green| Amber| Blue| White
1| 15| 14| 12| 22| 14
2| 20| 25| 22| 44| 28
3| 43| 36| 34| 66| 43
4| 58| 46| 46| 87| 58
5| 72| 55| 56| 108| 72
6| 86| 65| 68| 128| 84
8| 114| 81| 91| 168| 108
10| 142| 95| 112| 206| 132
15| 213| 126| 168| 294| 192
Table 2 BA390XS illuminance in lux 15cm from the lamp.
2.3 BA590X panel lamps
Intended for use in non hazardous areas these uncertified lamps incorporate a
20mA constant current regulator and therefore consume a fixed current and have
constant brilliance irrespective of supply voltage variations. When the supply
voltage to the lamp exceeds the minimum operating voltage the lamp will draw a
constant current between 18 and 22mA and the lamp brilliance will be constant.
Below the minimum supply voltage the lamp will have a reduced brilliance and
below a voltage which varies with the lamps colour, the lamp will not be
illuminated.
Intrinsic Safety Certification
The BA390X and BA390XS panel lamps have international intrinsic safety
certifications allowing them to be installed in gas and dust hazardous areas
worldwide. Dust certification is an option which should be specified when the
lamp is ordered.
Both types of lamp have IECEx Certificates of Conformity issued by
Certification Body Intertek Testing and Certification Ltd. IECEx certificates,
which are based on international IEC standards, are accepted directly or
indirectly in large parts of the world.
Notified Body Intertek Testing and Certification Ltd have also issued both
types of panel lamp with an EU-Type Examination Certificate confirming
compliance with BS EN harmonised standards which has been used to confirm
compliance with the European ATEX Directive 2014/34/EU. The lamps carry 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 accepted for installations in many other countries – see Blue Book
for details.
BS EN standards are identical to international IEC standards, therefore the
ATEX and IECEx certificates for these panel lamps use the same terminology and
have the same safety parameters.
For use in the USA both types of lamp have FM intrinsic safety and
nonincendive approval for use in gas atmospheres.
3.1 IECEx and ATEX certification
3.1.1 Gas atmospheres
The BA390X and BA390XS panel lamps have been certified:
Group II Category 1G
Ex ia IIC T4 Ga
–20°C ≤ Ta ≤ 60°C
When connected to a suitable system the lamps 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 which may be safely used with equipment having a temperature classification of:
T1 | 450°C |
---|---|
T2 | 300°C |
T3 | 200°C |
T4 | 135°C |
In ambient temperature of between
-20°C and +60°C.
This allows both types of panel lamp to be installed in all Zones and to be
used with most common industrial gases.
3.1.2 Dust atmospheres – option should be specified at time of ordering.
The BA390X and BA390XS panel lamps have been certified:
Group II Category 1D
Ex ia IIIC T135°C Da
–20°C ≤ Ta ≤ 60°C
When connected to a suitable system the lamps may be installed in:
Zone 20| explosive atmosphere in the form of a cloud of combustible dust in
air is continuously present, or for long periods or frequently.
---|---
Zone 21| explosive atmosphere in the form of a cloud of combustible dust in
air is likely to occur occasionally in normal operation.
Zone 22| explosive atmosphere in the form of a cloud of combustible dust in
air is not likely to occur in normal operation, but if it does occur, will
only persist for a short period.
Be used with dusts in subdivisions:
IIIA | combustible flyings |
---|---|
IIIB | non-conductive dust |
IIIC | conductive dust |
Having a minimum ignition tempe
Dust cloud | 202°C |
---|---|
Dust layer on lamp up to 5mm thick. | 210°C |
Dust layer on lamp over 5mm thick. | Refer to IEC 60079-14 |
At an ambient temperatures between: -20°C and +60°C.
3.1.3 Input safety parameters
The IECEx and ATEX input safety parameters Ui and Ii for the BA390X and
BA390XS lamps are the same, but the input power Pi are different for gas and
dust atmospheres.
Gas atmosphere:
Ui = 30V
Ii = 159mA
Pi = 1.2W
Ci = 0
Li = 0
Dust atmosphere:
Ui= 30V
Ii = 159mA
Pi = 0.683W
Ci = 0
Li = 0
BA390X and BA390XS panel lamps may be powered from any intrinsically safe voltage source with output parameters Uo, Io and Po equal to, or less than these lamp input parameters.
System Design
4.1 BA390X lamps
BA390X panel lamps draw a current of between 18 and 22mA when their terminal
voltage is between 14 and 30V. If the terminal voltage falls below 14V, the
current consumed and the lamp brilliance are reduced.
There are three design steps:
-
Select a Zener barrier, galvanic isolator or certified voltage source with output safety parameter equal to or less than the BA390X maximum input parameters i.e.
Uo = 30V dc
Io = 159mA
Po = 1.2W for gas hazards 0.683W for dust hazards -
Ensure that the cable capacitance and inductance are less than the maximum figures specified by the intrinsic safety certificate for the device powering the lamp(s).
-
Ensure that the voltage across the BA390X terminals is equal to or greater than 14V.
Fig 3 shows a simple application in which a single BA390X lamp is powered by a Zener barrier. The lamp may be turned on and off by switching the power supply on and off, or by a switch in series with the lamp in the safe area. The lamp may also be controlled by an IP20 protected manually operated switch in the hazardous area.
Fig 3 BA390X powered from a Zener barrier
Considering the voltage drops
Minimum operating voltage of BA390X 14.0V
Maximum voltage drop caused by barrier 7.3V
(22mA x 330Ω*)
Maximum voltage drop caused by cables 0.2V
(22mA x 10V cable resistance) 21.5V
- maximum end-to-end resistance of barrier
The power supply must therefore have an output of greater than 21.5V but less than the maximum operating voltage of the Zener barrier, which is typically 26.5V.
Alternatively a BA390X lamp may be powered from a galvanic isolator which can power two lamps in parallel as shown in Fig 4.
Fig 4 Two lamps powered by a IIB galvanic isolator
Considering the voltage drops when powering two BA390X lamps in parallel.
Open circuit voltage of galvanic isolator 21.4
Less maximum voltage drop caused by isolator 6.9
(44mA x 158V*)
Less maximum voltage drop caused by cables 0.4(44mA x 10V)
Voltage at BA390X lamps 14.1V
- maximum output resistance of galvanic isolator
4.2 BA390XS
BA390XS lamps, unlike the BA390X, do not contain a current regulator. The current drawn, and hence the brightness, must be defined by an external resistor or an external current regulator.
Caution
Connecting a BA390XS lamp to a non current limited source may permanently
damage the lamp.
BA390XS lamps are intended for use with low current intrinsically safe logic
outputs and their performance is specified at 4mA. Fig 5 shows how one
multiple output bus- powered fieldbus module can control up to six BA390XS
lamps.
Fig 5 BA390XS lamp powered by multiple digital output fieldbus module
In this example the module has six isolated 12V outputs each current limited
at 4mA, so no additional current limit is required.
When a BA390XS is powered from an intrinsically safe voltage source such as a
Zener barrier or galvanic isolator, a series resistor is required to define
the lamp current.
Resistor value in kV = IS supply voltage – 8 Required lamp current in mA|
This current limiting resistor may be installed in the hazardous area without
additional certification using the rules for Simple Apparatus defined in
section 5.7 of IEC 60079- 11. The lamp current should be selected to provide
the required brightness – see section 2.2 of this guide.
Fig 6 shows how four BA390XS lamps can be powered from a 24V dc supply via a
single industry standard 28V 300V Zener barrier or galvanic isolator. Each
lamp operates at a minimum current of 5mA when all the lamps are illuminated,
but the current rises and hence the lamp brightness increases when the other
lamps are switched off.
Fig 6 Four BA390XS lamps powered from a common barrier or isolator
Installation
BA390X and BA390XS lamps require a single 22.5mm diameter mounting hole and
may be closely grouped as shown in Fig 7. The lamps are supplied with a gasket
to seal the joint between the lamp body and the panel in which it is mounted.
When correctly installed the front of the lamp provides IP66 protection and
may be cleaned with a low pressure hose.
The rear of the lamp body has IP20 protection, but this can be increased to
IP66 using the BA599 rear sealing kit which includes a gland to support the
cable.
Fig 7 Fixing centres for maximum packing density
FM Approval
BA390X and BA390XS lamps have FM intrinsic safety and nonincendive approval
allowing them to be installed in most gas hazardous areas in the USA. The FM
and ATEX intrinsic safety parameters are identical so any of the circuits
shown in this application guide may also be used for FM installations.
Detailed IS and nonincendive installation requirements are defined by FM
Control Drawing CI390-12 which is appended to the FM Certificate of Compliance
which may be downloaded from the BEKA website
www.beka.co.uk.
6.1 Intrinsic safety
FM intrinsic safety approval permits installation in:
Class I | Flammable gases, vapours or liquids |
---|---|
Division 1 | Where ignitable concentrations of flammable gases, vapours or |
liquids can exist all of the time or some of the time under normal operating
conditions.
Division 2| Where ignitable concentrations of flammable gases, vapours or
liquids are not likely to exist under normal operating conditions.
Use with gases in groups:
Group A Acetylene
Group B Hydrogen
Group C Ethylene
Group D Propane
Having a temperature classification of:
T1 | 450°C |
---|---|
T2 | 300°C |
T3 | 200°C |
T4 | 135°C |
At an ambient temperature between –20 and +60°C when powered from a barrier,
isolator or voltage source with a Uo of less than 1.2W. When powered from a
certified device having a Uo between 1.2 and 1.3W, the maximum permitted
ambient temperature is reduced to +40°C.
This allows BA390X and BA390XS lamps to be installed in both Divisions and to
be used with most common industrial gases.
6.2 Nonincendive approval
FM nonincendive approval permits installation without Zener barriers or
galvanic isolators in:
Class I | Flammable gases, vapours or liquids |
---|---|
Division 2 | Where ignitable concentrations of flammable gases, vapours or |
liquids are not likely to exist under normal operating conditions.
Use with gases in groups:
Group A Acetylene
Group B Hydrogen
Group C Ethylene
Group D Propane
Having a temperature classification of:
T1 | 450°C |
---|---|
T2 | 300°C |
T3 | 200°C |
T4 | 135°C |
At an ambient temperature between –20 and +60°C
BEKA associates Ltd.
Old Charlton Road., Hitchin, Herts. SG5 2DA UK
Tel: (01462) 438301
Fax: (01462) 453971
e-mail sales@beka.co.uk
www.beka.co.uk
Issue 2 June 2018