... principle, proximity probe, proximity switch2.power voltage and output type: dc6~36v(npn, pnp, dc two line) and ac ... scr is available in all models3. testing distance: in shield type: 5mm(lm18), 7mm(lm22), 8mm(lm24), 10mm(lm30); ... lm24), 15mm(lm30). 4. output current: there are two type in this field: dc and scr . dc: 200ma(lm18, ... voltage drop(ac/dc): dc< 3v, ac LM14 cylinder type Proximity Switch