2.5Measuring transducer type LOF500..ZWhen the type designation is supplemented by a "Z" (not for the LOF500..S andLOF50019"Duo), this means that two potential-free change-over contacts are available for alarm-signalling purposes.2.6Type codeAlarm signalling with submerged sensor tip (relay released):LOF 500, LOF 500 19"1x potential-free change-over contact alarmLOF 500 S, LOF 500 19" S1x potential-free change-over contact alarm;1x potential-free change-over contact faultLOF 500 S, LOF 500 19" S2x potential-free change-over contact alarm LOF 500 19" Duo2x potential-free change-over contact alarm;each channel 1xAlarm signalling with emerged sensor tip (relay released): LOF 500 T, LOF 500 19" T1x potential-free change-over contact alarmLOF 500 TZ, LOF 500 19" TZ2x potential-free change-over contact alarm3Technical data3.1Electrical dataAuxiliary power circuitAuxiliary power24 V, 110 V, 230 V, 50 Hz or 24 V DCPower inputmax. 4 VA or 5 W,(LOF 500 19" Duo max. 8 VA or 10 W)Level detector circuitType of protection[EEx ia] IICVoltageU
o ≤ 15.8 V,CurrentI
o ≤ 26 mA,PowerP
o ≤ 147 mWMaximum permissible value pairs of the outer inductance and capacitance:L
a 10 mH5 mH1 mHC
a 110 nF150 nF200 nFElectrical data of the change-over contactsAlternating voltage: ≤ 250 V, ≤ 4 A, cos ϕ ≥ 0.7, ≤ 500 VADirect voltage: ≤ 250 V, ≤ 0.25 A, ≤ 50 W
Overfill Protection System LOF 1.1 and LOF 500/NB220Page 41/43