Intrinsically Safe Alarm Annunciator

Intrinsically Safe Alarm Annunciator
Business Type Manufacturer, Exporter, Supplier, Retailer, Wholesaler
Model No ISA-2

Preferred Buyer From

Location Anywhere in India

Model ISA-2 is an intrinsically safe alarm annunciator suitable for Group IIA, IIB or IIC application as per IS/IEC 60079-11:2006. This design is tested and certified by the only authorities in India viz. CIMFR-Dhandabad & CCOE-Nagpur. The Split type design comprises of
i) Intrinsically safe power supply unit suitable for SAFE AREA location and
ii) annunciator logic with LED display window located in Hazardous area.

IS annunciators are available for input supply of 24V DC OR 90 to 270V AC/DC supply. The available sequences are auto, manual or first out seq. The numbers of points per cabinet are four to Eighty points in various configurations. Three LEDs per window are provided, since filament lamps are obsolete & not permitted in Hazardous area location. Pneumatic hooter with flame proof solenoid valve is available for audible alarm in hazardous area location

Salient Features

  • Plug-in modular concept, for logic circuits, power supplies, display windows, etc.. for simplicity of maintenance.
  • Logic design is based on integrated circuits. CMOS ICs are employed for its dynamic characteristics and unique features like high noise immunity, wide range of supply voltage capabilities [Vcc-3 to 12V DC] fast response time and compatibility to use in industrial applications in Hazardous area w/o FLP enclosure.
  • Switch mode power supply unit with individual zener barriers for all internal low DC voltages, required for annunciator windows, is located in SAFE AREA OR can be mounted in FLP enclosure for HAZARDOUS AREA location.
  • Common plug-in flasher module with different colored handle is provided. It can cater upto 80pt. max.
  • Fibreglass moulded lamp display boxes with press-fit type window frames.
  • Photographic & computerized legend inscription films provided for better readability, easy replacement and various letter sizes.
  • NO/NC contact selection on each module by special press-fit type DIL plug for simple and reliable operations.
  • Protection provided for earth faults or erroneous application of any potential such as 230VAC or 110VAC on field contact terminals. No damage or malfunctioning is possible.
  • POWER ON indication on front facia of annunciator cabinet.


Mounting  & Installation Procedure :

Ensure the panel Cutout/s made for annunciator unit/s are as per drawing enclosed. Before installation check all sub-assemblies for transit damages if any. Install the Annunciator unit on the panel. Fix mounting clamps to secure the Annunciator unit in position. Check powerpack unit which is to be mounted separately in Safe Area. Fix the powerpack unit by means of screw and nuts. Remove the Annunciator Rear Cover and Powerpack Front Cover. Refer to external connection drawings for Annunciator & powerpack unit. Connect wire for pushbuttons to the Annunciator. Also interconnect Annunciator unit with powerpack unit as per external wiring diagram. Connect supply incoming and hooter cables to Powerpack Unit. Do not  connect any signal contact cables. Proceed further as per ‘Testing Procedure’ given under : (3)

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Possible Faults and Rectifiction

Rectification procedure for various possible faults which may occur,--- during commissioning, is given below:
No. Fault Symptom Rectification
1 Annunciator is totally off a) Check input supply voltage.
b) Check Power Supply Fuse.
c) Open terminal plate & check wires for open conditions
d) Follow standard fault finding procedure by checking filter capacitor, bridge rectifier diodes; transformer etc.
2 Flashing condition without audible
for all modules.
a) Check Hooter fuse, Hooter supply and Hooter itself.
b) Check Audible Relay(located in power supply unit) for contact operation.
c) Replace Flasher Module
3 Annunciator windows remain off (any one or more) a) Check Supply output from power pack unit for those windows.
b) Replace seq. Modules for those windows.
c) Check LEDs by usinsg a multi-meter.
4 During Fault/Test operation for all windows LED remain
steady on without flashing but Audible comes on.
a) Replace flasher module.


Note:  If above mentioned Fault rectification procedure fail to solve the problem or the nature of the Fault is different from what is given above, then please write to us and furnish us the
following details.

  • Natures of Fault : Describe the nature of the fault in detail.
  • Serial number of the Annunciator unit.
  • If any part is found defective please send it to us which will enable us to investigate & send
  • a suitable replacement.

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