Manual alarm without power supply,but can provide an effective alarm in the place that without power supply.Simply shake the handle clockwise through artificial hand,speed arrive junior (50-80 rev / min) can achieve the desired effect alarm,the sound sharp,shocking large, penetrating power.Alarm sound depends on the handle speed of shaking.
Handcranked siren small size,light weight,easy to carry,easy to install,does not require any tools,Only need 0.15 square and where people stood can normal operation ,the mobility of the job is very strong.
It is an ideal Alarm equipment when Civil defense,military, detention centers,prisons,mines,airports,pastures,oil depots,warehouses, hotels,restaurants and other business units Critical situation occurs.
Sound Rating: 110±2dB(A) @1M
Output Frequency: 550±20Hz (Dependent on Rotation Speed)
Sound range:1000m
Net Weight: 1.3Kg
Carton Size: 290*190*170mm
The principle of traditional manual alarm is the application of shock sensors,auto alarm sensors work once accept vibration signal .As a result , thunders and rains,or touches of dogs and cats , even car alarms of other cars nearby,can cause alarm reaction .
The principle of manual alarm is turning the crank ,the gear box of progressive transmission ,through the transmission block driving wheel at high speed .In the process of high speed , high speed and high pressure to set the wheel on absorption of air fixed window of resonance in extrusion and at the same time, to play the role of alarm.
Becasue it is manual alarm , the primary speed determines the sound effect of the alarm. The speed and the sound effect is proportinal , relatively speaking , the higher the speed , the greater the sound . There are some differences from man to man to shake the alarm. The height , strength ,shaking speed of the man who shake the alarm influences the alarm sound effect. So we are here for macro regulation ,the primary speed of shaking should not less than 90r/min, otherwise it will not sound effect.
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