Mining Ex Flame Proof Intrinsic Safety Telephone

1,Application
KTH-33 Mining intrinsically safe automatic telephone is for pulse and double audio compatible telephone, with a device context HDK mine telephone coupler and output signal to meet the requirements of dispatcher station or exchange can form coal mine safety communication system network. Can be widely used in has the explosive gas environment. The explosion-proof mark for “ExibⅠ”.

2,Main Feature
1,This phone casing for aluminium alloy , beautiful outlook, high mechanical strength

2,The domestic new key number plate.
3,Circuit inside the telephone uses the international general integrated circuit, has the advantage of   dialing accurate, clear communication, work stability etc

4,Have dual tone frequency number and pulse dialing function (factory general switch in double audio)
5,The whole item with shockproof, moisture proof, small volume, light weight, strong, durable, easy maintenance, etc

3. Main technical parameters
1,Working condition
Operating temp:-10°C-+40°C;
Relative temperature:≤95%(+25°C)
Atmospheric pressure:(86-106)kpa
Related Equipment:HDK coupler
2,The Intrinsically safe parameters see table 1:

3,Electric-acoustic index table 2:

Ring sound grade:≥80dB.
Pulse intermittent ratio:1.6±0.2:1
pulse rate:10±1time/second

1.frequency error≤1.5%.
2.Low frequency group of level:-9dBm±3dB
3.High frequency group of level:-7dBm±3dB
4.Frequency combination, the high frequency component level should be better/higher than low frequency component level high 2±1dB
5.Dimensionmm:112×290×122
6. Weight of the:2.5kg
7. Communication distance:≤10km,cable assembly specification MHYV1*2*7/0.37