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Product Descriptions

The unit chamber structure designed according to the best performance of computer simulation, this ionization chamber is dedicated to smoke 

detectors. All materials are made of highly corrosion-resistant materials, and the safety performance reaches BS/ISO/ANS/GB C64646 standards.

NIS - 07 ion smoke sensors have an ionization chamber, the ion chamber used artificial radioactive element americium 241 (Am241), the 

intensity of about 0.8 micro Curie, under the normal state is in the balance of the electric field condition, when there is a smoke into the 

ionization chamber, ionization produced positive and negative ions, interfere with the normal movement of the charged particle, under the 

action of electric field, respectively to the positive and negative electrode, destroyed the balance between the internal and external ionization 

chamber, current, the voltage will change. Ion smoke smoke sensor is through the equivalent resistor voltage changes due to ionization 

chamber  to perceive micro electric current change device of smoke particles. To macro performance for the equivalent resistance of ionization 

chamber increase causes the voltage at the ends of the ionization chamber, thus to determine the status of the smoke in the air.

Within the ionization chamber, there are two plates with voltage in between them. If an electron in this space is knocked out of place due to 

smoke entering the chamber, it causes ionization, and, in response, the fire alarm goes off.

Ionization source characteristics and radiation safety performance:

The ionization chamber fitted with a high performance and low activity of Am-241 ionization

Ionization source activity: 0.5uCi ( 18KBq ) 0.8uCi±10percent ( 30KBq±10percent )

Ionization source a spectroscopy: peak: 4.5MeV ± 10percent, FW HM<0.7MeV

Safety grading standards ( GB4075, IS02919 ) C64444

Ionization chamber radiation dose rate at 25cm: 0.03mGy/ (1mGy value lower than population does standard)

Product Features

Outer electrode and the source electrode voltage ( VDD supply voltage ): 9V

Operating Temperature: 20 ± 3℃ close to atmospheric pressure standard atmospheric pressure, clean air

Collecting electrode equilibrium potential: 5.3V ~ 6.5V

Collecting electrode potential with the smoke concentration change

The light reduction rate was 1percent feet: 0.6V

The light reduction rate was 4percent feet: 2.2V

Insulator leakage current ( Max. ): 0.5Pa

Capacitor ( collection of extreme outer electrode + to the source base ): 6pF

Material: Metal

Color: Silver

Size: 28mm x 16mm x 37mm

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