The KTA152 Mining Safety Coupler features a 19-inch 3U standard rackmount design with a card-based structure, allowing for flexible configuration of card quantities based on actual needs. Each coupler is independent, so a single-coupler failure does not affect others, and a single-card failure does not impact other cards. The mining safety coupler converts pick-up/hang-up signals, dial pulse signals, dual-tone multi-frequency signals, and emergency call signals from intrinsically safe telephones into signals that can be recognized and accepted by dispatching switches. It also converts ringback signals, emergency call signals, and reminder signals from dispatching switches into intrinsically safe signals that can be accepted by the telephones. It converts the supply voltage from dispatching switches into the supply voltage that meets the requirements of intrinsically safe telephones. It transmits two-way voice signals and facilitates the bidirectional conversion of various detection signals between dispatching switches and intrinsically safe telephones.

Product Features:

Wiring: Equipped with dedicated cables, connects the scheduler's output to the coupler's non-safe input, no additional wiring junction box required.

Appearance: 19-inch 3U standard chassis, card-slot design, card replacement without adjusting connection lines

Explosion-proof Type: Ground output intrinsic safety type, Explosion-proof Mark: [Ex ib]ⅠMb.

Specification: Single board 4-way passive coupler, up to 64 channels per frame.

Safety Sign Number: MHC210057

Ex-proof Certificate Number: CCCMT21.0060

Dimensions: 481mm (Width) x 337mm (Depth) x 133mm (Height)

Fully Assembled Net Weight: 8.6 kg

Technical Specifications:

Environmental Conditions

The coupler should operate normally under the following conditions:

a) Environmental Temperature: 0℃ to +40℃

b) Average Relative Humidity: ≤90% (+25℃)

c) Atmospheric Pressure: 86kPa ~ 106kPa

d) No significant vibration or impact areas.

e) A safe area without methane, coal dust, etc. on the ground.

The coupler should be capable of withstanding the most severe storage and transportation conditions.

a) High Temperature: +60℃

b) Low Temperature: -40℃

c) Average Relative Humidity: 95% RH

d) Vibration: Acceleration 20 m/s²

e) Impulse peak acceleration of 300 m/s².

User Line Conditions

The maximum distance between the coupler and the underground telephone is 10km (the model and specification of the mine cable is: MHYAV, MHYBV, MHYA32. Wire diameter is 0.8mm.) The user's line parameters are:

a) Conductor core DC resistance: ≤36.7 Ω/km

b) Capacitance: ≤0.06μF/km

c) Inductance: ≤800 mH/km

d) Minimum insulation resistance: 15kΩ to 20kΩ.

Coupler Input/Output Parameters

Non-essential safety input parameters

a) Maximum Direct Current Input Voltage: ≤60V

b) Maximum Direct Current Input: ≤60mA

c) Maximum Input Voltage for Bell Stream: ≤90V

d) Maximum Input Current for Bell Flow: ≤90mA.

2. Intrinsically Safe Output Parameters

a) Maximum DC open-circuit voltage: ≤60V

b) DC Maximum Short Circuit Current: ≤34mA

c) Bell Flow Maximum Open Circuit Voltage: ≤60V

d) Maximum short-circuit current of bell flow: ≤38mA.