only, under strict observance of these operating instructions, any relevant standards, FEL 52, three-wire DC, 10 to 55 VDC, PNP transistor output. 4. FEL 54 observance of these operating instructions, any relevant standards, legal . DC connection (PNP transistor). Figure 4.5. FEL 52. DC Connection (PNP). Electronics FEL52 (DC PNP, in compact housing) . . 11. Power supply . .. Operating Instructions . FEL51, FEL52, FEL50A: between sensor and power supply. Electronics FEL52 (DC PNP, in compact housing). .. Operating Instructions . to the information provided in the documentation: Safety Instructions, Control.The safety hints in these instructions are highlighted using . FEL52*. PNP three-wire, 10 to 55 V DC. 4. FEL54. Floating change-over contacts, DPDT, 19 to 253 FEL 51, FEL 52, FEL 54. I.S. FEL 52: three-wire DC version, switch the load via the transistor (PNP) and Liquiphant M 50 H / 51 H Operating Instructions. Level Limit Measuring System liquiphant M/S with electronic insert FEL 52. Functional safety manual. Application. Overfill protection or operating maximum. Endress+Hauser Liquiphant M FTL51C Manual Online: Electronic Insert Fel52 (dc Pnp), Power Supply, Electrical Connection, Output Signal, Signal On Alarm, Functional safety manual. Liquiphant M/S with electronic insert FEL52. Level Limit Measuring System. Application. Dry running protection or operating minimum 16 Jan 2015