..:: DK SIGNAL ::..
    DK PA-Systems  
    High Power Aluminum Speaker  
    TU 300/400  
    Siren Horn Loudspeakers  
    TC 50F  
    TC 100  
    TC 100L  
    TC 100H  
    Paging Horn Speaker  
    TC 301/301U  
    TC 201/201U  
    TC 30  
    Paging Horn Speaker with Transformer  
    TC 15T  
    TC 30T  
    Plastic Horn Loudspeaker  
    30 Watt Plastic Horn Loudspeaker  
    15 Watt Plastic Horn Speaker  
    Ceiling Loudspeaker  
    Ceiling Loudspeaker Standard  
    Fire-proof type Ceiling Loudspeaker  
    Polymer Version Ceiling Loudspeaker  
    Sound Bowl Ceiling Loudspeaker  
    Spherical Ceiling Loudspeaker  
    Driver Unit  
    DKU 15-35F  
    TU 15L-50N  
    DKU 60F  
    DKU 100F  
    Driver Units with Transformers  
    Siren Driver Unit  
    DKU 60N  
    DKU 100N  
    DK Security Systems  
    Digital Surveillance  
    PCI based DVR  
    USB 2.0 - DVR  
    Wireless Appliance  
    Wireless Security Digital Photo Frame  
    Wireless AV signal transmitter  
    DK Safety Warning Systems  
    Siren 250-4000  
    Electronic Siren  
    Siren 250-2000 M05  
    Siren 250 M05  
    Siren 500 M05  
    Siren 1000 M05  
    Siren 2000 M05  
    Siren 250-2000 M10  
    Siren 250 M10  
    Siren 500 M10  
    Siren 1000 M10  
    Siren 2000 M10  
    Mobile Siren  
    Mobile Siren M250  
DK Safety Warning Systems Siren 250-2000 M10 Siren 250 M10
(1) The Siren 250 M10 electronic siren serves to alert the fire and rescue services and to warn the public in the event of an emergency.

(2) The system consists of an electronic control unit and two acoustic radiators. The current required for operation is taken from two absolutely maintenance-free lead batteries. Prolonged operation is guaranteed even in the event of a power failure. Mains-independent operation on a solar power supply is also possible as an option.

(3) The control unit contains 2 short-circuit-proof, overtemperature-protected low frequency amplifiers with two 125W output power each.

(4) Digital signal processors DSP generate the necessary audio frequency signals, control and monitor the power output stages and simultaneously measure the functionality of the acoustic radiator systems connected to the outputs. Differences in impedance of the radiators, variation in voltage of the batteries are also monitored and automatically set, if necessary, to the nominal power output.

(5) The processor module UP98 takes over optional controls. This also accommodates the radio interface and the digital voice memory module providing these options have been ordered

(6) The SLG98 power supply unit provides a temperature-compensated and conserving charging of the batteries. It also supplies the voltages required for the system. For feeding of a two way-radio a 12 volts / 0.4 A power supply is already built in. If necessary, a converter module at 50W can be optionally adapted for feeding a radio system. This reduces the 24 V battery voltage to the 12 V supply voltage without losses. This unit also contains the charge controller for alternative solar energy supply.

(7) The individual components are linked by the connection card VPE98. The optocoupler inputs also on this guarantee electrical isolation from external devices

(8) A notebook or a service device can be connected via a programming adapter to a 37-pin SUB-D socket. This can be used to check the operating states of the system and load new program routines.

(9) The various terminals, fuse holders and an overvoltage protection element for the 230 V mains supply voltage are located on the mounting rail. An optional overvoltage protection can be installed in the antenna cable.

(10) The complete electronics, including the batteries are installed in a steel cabinet with the dimensions 600x600x210mm. The cabinet is electrophoretically dipped and powder coated with RAL 7032.

(11) The cable inlets for mains and external alarm generators and the acoustic radiators are on the bottom of the machine.

(12) The basic equipment includes a connection possibility for an external radio control as well as a fire and fire drill alarm.

(13) A radio control with status feedback, an operating and display panel, a handheld microphone with preamplifier and a digital voice memory with 180 s recording time can be integrated as options in the cabinet. The operating and display panel can also be fitted with a goose-neck microphone and is available in remote from as a desktop or wall-mounted model.

(14) The outdoor unit consists of two acoustic radiators with the appropriate flanges and covers. They are made of corrosion-resistant diecast aluminum. All screws and fastenings are made of stainless steel. An antenna carrier can be mounted optionally.

(15) The use of high-quality, reliable components mean that no maintenance work is necessary in the whole system. The required technical data are fully complied with in a temperature range from -40° to +70° Celsius. However, the use of lead batteries restricts the application to-25° Celsius. In this range the capacity may drop dependent to the load.

Technical data

Technical data Acoustic Radiators

Acoustic radiators 180° formation

Sound level

103,0 dB (C) Leq Average in 30m

Sound radiation


Basic frequency


Number of horns


Intermediate flange


Siren driver


Cover plate


Antenna flange


Screw set


Connector plug


Total weight


Total height



820 x 160mm


Number of power amplifiers


Output power

250W (reducible via software download in steps)

Number of different signals

2, optional up to 7
1 external clock input

Status detection via service interface

Power failure, battery fault, cabinet door open, power supply error, output stage error, loudspeaker error

Battery voltage / capacity

24V / 25Ah

Mains voltage

230V AC

Power consumption at rest
with charged batteries


Number of alarms in event of power failure

at least 20 siren alarms and 20 voice texts of 1 min. duration over a period of 10 days at above 0°C

Temperature range electronics

-40°C to +70°C

Temperature range battery

-25°C to +60°C



Cabinet dimensions

600 x 600 x 210mm (W x H x T)


OPT-Siren 010

Radio interface

OPT-Siren 020

Operating and display panel “internal”

OPT-Siren 030

Operating and display panel “external”

OPT-Siren 040

Local microphone (handheld microphone with preamplifier and tape recorder input)

OPT-Siren 050

Digital voice memory 180sec.

OPT-Siren 060

Solar operation

OPT-Siren 070

Antenna surge voltage conductor

OPT-Siren 080

Antenna carrier

OPT-Siren 090

Holder and wiring for radio control

OPT-Siren 100

100V ELA-technique

OPT-Siren 110

Converter module 24/12V - 4A

OPT-Siren 120

Programming adapter

OPT-Siren 130

Common trouble identification via potentialfree relay-contact as an option.



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