Intrinsically Safe Alarm Sounders

BR385 Intrinsically Safe Alarm Sounder & Optional Beacon

  • Intrinsically safebr385
  • Up to 103 dB(A) output
  • 49 first stage, 21 second stage, and 9 third stage alarm tones
  • PFEER compliant
  • Volume controlba386_385
  • IP66 environmental rating
  • Input overload protection
  • Replacement for Yodalarm YO5
  • Combine with a BA386 flashing beacon
  • uses a single galvanically isolated barrier
  • includes terminals for a ‘silence’ push button
  • silence time is adjustable from 1 to 30 minutes
  • Optional kit to combine the two unit

With forty-nine alarm tones to choose from these intrinsically safe sounders allow you to pick sounds which will penetrate the ambient background noise in your plant. Second and third stage tones are easily triggered by secondary control circuits. Tones are selected by DIP switches, and there’s also a volume control. A crystal controlled oscillator accurately defines the frequency and repetition rate of each alarm signal. This insures that multiple sounders set to the same tone(s) remain synchronized throughout your plant.

  • Option 2 – multiple sounders, use of multi-channel barrier for economy:
    • Suitable barrier: GMI D1042Q (quad channel) with each output separately powering an individual BR385 sounder.

Note that while each sounder has it’s own dedicated barrier channel, a complete failure of the barrier module will affect all alarm notifications associated with it.

  • Option 1 – mutual two-wire connection: The BA386 Beacon & BR385 Sounder Combination may be powered from a single intrinsic safety barrierproviding 16VDC @ 35mA and with safety/entity parameters not exceeding the following values: Uo/Voc=28V, Io/Isc=93mA, Po/Po=660mW.
    • Suitable barriers: P&F KFDO-SD2-Ex1.1045; MTL5025

Note that failure of the single barrier will negate both alarm notification modes.

Note that the failure of one barrier will leave the other alarm notification mode working.

  • Option 3 – multiple beacon & sounder combos, use of multi-channel barrierfor economy:
    • Suitable barrier: GMI D1042Q(quad channel) with each output separately powering either a beacon or a sounder. Under no circumstances may two barrierchannel outputs be connected in parallel to power one beacon-sounder combination.

Note that while each beacon and sounder has it’s own dedicated barrier channel, a complete failure of the barrier module will negate all alarm notifications associated with it.

IS-MA1 Intrinsically Safe Alarm Sounder

  • Intrinsically safeIS-mA1 IS-minialarm
  • FM, ATEX, IECEx, & GOST-R certification
  • Takes 16-28 VDC from suitable safety barrier
  • Loud 100 dB(A) audible output
  • Choice of 49 alarm tone combinations, 3 stages
  • Effective range of 130 feet / 40 meters at 1 kHz
    IP65 ABS flame retardant housing
  • End-of-line (EOL) resistor certification
IS-mA1 IS-Mini Alarm
Nominal Output100dB (A) @ 1m+/-3dB-Tone 2* [91dB (A) @ 10ft/3m]
No. of Tones49 (UKOOA/PFEER compliant)
No. of Stages3
Volume ControlMax. 100dB(A); Min. 90dB(A)- Tone 2
Effective Range40m/131ft @ 1KHz
Supply Voltages16-28Vdc via Zener Barrier or Galvanic Isolator
Stage SwitchingDC units: negative or positive
Current25mA typical when powered from
24v supply via 28v 300 Ohm
Zener barrier
Ingress ProtectionIP65
Housing MaterialUL94VO & 5VA FR ABS
Housing ColorRAL3000 Red
Fixings:Stainless Steel
Cable Entries2 x M20 clearance gland knockouts
Custom configurations also available
0.5 to 2.5 mm^2
Operating Temp(-)40 degrees to +60 C [-40 to +140F]
Storage Tem(-)40 to 60C [-40 to +158F]
Relative Humidity90% at 20C [68F]
Hazardous AreaATEX/IECEx/FM
 II 1G Ex ia IIC T4 Ga (-40ºC <=Ta<= +60°C)
IS Class I, Zone 0, AEx ia IIC T4
 IS Class l, Division 1, Groups A, B, C, D
0ExiaIICT4 IP65 -40° to +60°C

IS-pA1 Panel Mount Sounder

IS-pA1 Panel Mount Sounder

The IS-pA1 is a compact, panel mount 90dB(A) intrinsically safe alarm buzzer.

Producing a high frequency continuous tone, the IS-pA1 can be pulsed to produce different sounds. Utilising the supplied threaded lock nut the IS-pA1 mounts into a 28mm hole – ideal for applications in control panels where a fault indication or other process alarm is required.
IS-pA1 Panel Mount Sounder
Nominal Output89.6dB(A) @ 1m+/-3dB-Tone 2* [80.6dB (A) @ 10ft/3m]
No. of Tones1- continuous tone
Voltage16-28Vdc via Zener Barrier or Galvanic Isolator
Current12mA typical when powered 24v
supply Zener Barrier
Ingress ProtectionIP65
Housing MaterialUL94VO & 5VA FR ABS
Housing ColorRAL7038 Grey
MountingPanel mount- 28.5mm
TerminalsSpade Terminals
Operating Temp -40° to +60°C [-40 to +140°F]
Storage Tem -40° to +70°C [-40 to +158°F]
Relative Humidity 90% at 20°C [68°F]
Hazardous AreaATEX / IECEx
II 1G Ex ia IIB T6 Ga (-30ºC <=Ta<= +60°C)
May be powered from any certified Zener barrier or galvanic isolator whose output parameters do not exceed:
Uo : 40VDC
Io : 660mA
Po : 1.3W (T1-T4)
Po : 0.6W (T5)
Po : 0.3W (T6)