Cranford Controls

IS Sounder

Product Overview

The IS-mA1 is a compact, 100dB(A) alarm sounder. Approvals include ATEX, IECEx and GOST-R for Zone 0 applications and FM approval for Class I Division 1 and Class I Zone 0 applications.


  • The IS-mA1 is suitable for all intrinsically safe signalling applications including fire, security and process control.
  • The IS-mA1M version is also available for Group I mining environments.


Nominal output 100dB(A) @ 1m +/- 3dB – Tone 2*
No. of tones 49 (UKOOA/PFEER compliant)
No. of stages 3
Volume control Max. 100dB(A); Min. 90dB(A) –
Tone 2
Effective range 40m @ 1KHz
Voltage 16-28vdc via Zener barrier or
galvanic isolator
Current 25mA typical when powered from
24v supply via 28v 300 Ohm
Zener barrier
Ingress protection IP65
Rating Continuous
Housing material UL94V0 & 5VA FR ABS
Housing colour RAL3000 Red

*For further product details, please refer to the Product Data Sheet

Part Numbers

305-005 ?IS Minialarm sounder red?