The BFRA251 offers an adjustable trip-point with voltage-free 8A contact output, and a retransmit analogue output representing input signal range. The BFRA251 offers an economical solution to monitoring applications for signals from pulsing devices, such as proximity sensors, combining compactness with accuracy and flexibility. Power supply can be 12 or 24Vdc or low level (non-isolated) AC voltage. Double surge protection is standard as with all Series 200 modules to prevent failure due to spikes induced by DC switched inductive loads. A variety of frequency or pulse input signals are supported such as signals from turbine flow meters, NAMUR proximity sensors. Frequency range is 5Hz up to 5kHz with amplitude of 0.1Vpp. up to 50V pulses. The trip-point and switching hysteresis are adjustable from the front of the module. A 2mm test socket is used for trip adjustment within a 0 – 5V trip set range calibrated to correspond to the input signal range. Trip status is indicated by a red L.E.D. on the front. High or low setting is selectable internally by coding plugs.