'The DS series sounders are designed for requirements under industrial conditions and can be used as universal hazard detectors. The sounders, which are suitable for indoor and outdoor use, generate warning signals in 31 different tones, which can be selected using an internal switch.
Pressure chamber sound system: Excellent penetration of acoustic obstacles such as walls and doors, high proportion of low frequencies.
They are particularly suitable for fire alarms as they are VdS and EN 54-3 certified.
Aluminium housing with high IP protection (IP 66/67): Wide range of applications (dust and fog). Safe use outdoors with maximum reliability.
Wide operating temperature range: -40C - +55C
Dimensions LxWxH: 143 x 133.5 x 133.5 mm
These devices are very solid, robust and durable and come with a 10-year guarantee.
DS sounder variants and options:

• SIL: for use in safety systems (SIS) up to SIL 2 / PLd
• 3G/3D: suitable for use in potentially explosive environments in zones 2 and 22
• External tone selection (2 variants) for controlling several tones over longer distances in 2 variants: TAS: for all voltages = potential-free normally open function
TAV: for 12 V / 24 V = voltage supply

• LSR - volume reduction
• GL approval, UL approval
• DN - 2 externally controllable volume levels, e.g. for automated day/night changeover operation'