Model KT1013 Mine-used Duplex Testing Telephone is newest product for monitoring and control systems for coal mine, and it can be used as liaison device for maintenance worker when calibrating monitoring and control parameters in mine underground with explosion danger of methane and coal dust to communicate with surface center.
Functions
and features
In communication the main telephone can work in handfree or non-handfree mode;
The auxiliary telephone is portable passive device;
Communication distance between main telephone and auxiliary telephone can be up to 15 km;
Can realize communication between main telephone and auxiliary telephone and between auxiliary telephones;
The auxiliary telephone employs 2-core plug for input.
Technical Parameters
Main Telephone
Working Voltage: 24 V
Working Current: 120 mA
DC short-circuit Current Output: 65 mA
Voice Output Amplitude: 600 mV
Output Power of Loudspeaker in handfree: 1 mW/8
Headphone Output Amplitude: 35 mV
Auxiliary Telephone
Working Voltage: 24 V
Voice Output Amplitude: 600 mV
Headphone Output Amplitude: 400 mV
Normal communication between main telephone and auxiliary telephone in 15 km
13 auxiliary telephones connected with one main telephone
120 mA
600 mV
3 auxiliary telephones connected with one main telephone
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