Design and Application of Automatic Control System for Fully Mechanized Mining Face in Coal Mine

Table 1

Sensor type and model selection.

Sensor	Working power	Output signal	Temperature range	Measuring distance	Ranging resolution (mm)
Sonic level gauge	DC24 V/AC220 V	Current 0/4～”20 mA, load capacity is less than 600 Q	−20°C～60°C;	0～25 m;	1
Light sensor	16 V–24 V, current < 24 mA	Current 0/4～20 mA	700°C～1200°C	0.25 m～20 m
Ultrasonic flowmeter	AC220 V 50 HZ	Current 0～20 mA, load capacity is less than 600 Q
KGY4 negative pressure sensor	DCl8 V, the current is not more than 100 mA	Frequency 200”～1000 Hz, current 4～20 mA		100 kPa-0 kPa