The ST-200 hand cranked alarm is manually operated by rotating the handle, accelerating step by step through the transmission of the gearbox, and then driving the sounding wheel to operate at high speed through the transmission block. During the high-speed operation of the Minglun, resonance is generated by the high-speed and high-pressure air absorbed and squeezed out of the fixed window of the fixed wheel, thereby playing an alarm role.

II Product Technical Parameters:

Style: Portable, Fixed

Sound level dB (A) 1m: 120

Audio frequency HZ: 550 ± 20

Transmission distance Φ m: 2000

Material: Aluminum alloy

Net weight kg: 7

Packaging size mm: 380 × 220 × 220

One Product features:

The ST-200 hand cranked alarm is small in size, light in weight, easy to carry, and easy to install. No tools are needed. Only a 0.15 square meter area and a place for people to stand are needed for normal operation, and the mobility of the work is very strong.

II Product influencing factors;

Because it is a hand cranked alarm, the primary speed of the hand cranking determines the sound effect of the alarm. The speed and sound effect are directly proportional, relatively speaking, the higher the speed, the louder the sound. There is a difference between shaking the alarm between people. The height, strength, and speed of shaking of people are all direct factors that affect the sound effect of the alarm. Therefore, we have made macro regulations here that the primary speed of shaking cannot be less than 90r/min, otherwise the expected sound effect will not be achieved.