reverse polarity protection yes switching frequency < 500 Hz nominal sensing distance Sn 8 mm material (sensing face) PBT type rectangular IFFM 20P37A3/S35L dimension 20 mm voltage drop Vd < 2 VDC output indicator LED red housing length 32 mm output circuit PNP break function (NC) manufacter SKU IFFM 20P37A3/S35L connection types connector M8 current consumption max. (no load) 10 mA short circuit protection yes protection class IP 67 housing material brass nickel plated hysteresis 3 ... 20 % of Sr mounting type flush output current < 200 mA operating temperature -25 ... +75 °C voltage supply range +Vs 10 ... 30 VDC