Additional information:
1. Fuse F1 rating for 110 or 220 VAC version: 125 mA, fast acting, 5 x 20mm.
Before fuse replacement, disconnect the power to the unit!
2. Fuse F1 rating for 12 or 24 VDC version: 2 Amp, fast acting, 5 x 20mm.
3. There are two jumpers on the Main board: JP1 and JP2. They are located near
trimmer R3 (Zero). Only one of them should be shorted!
• The default setting is JP1 shorted and JP2 opened. This gives quick response
to oil detection, but also higher sensitivity to water turbulence.
• If the sensor is installed in turbulent environment, it is advised to open JP1 and
short JP2. This activates a low pass filter on the signal, which helps in avoiding
false alarms, yet keeps a good oil detection response.
4. Water / Oil / Air relay outputs (dry contacts): Using these outputs with a low
power AC load might give a problem of the load being activated even when the
relevant relay contact is open. For example, it might happen if a 220VAC digital
input of a PLC in connected to the relays. This is caused by the 0.015uF 275VAC
capacitors installed in parallel with the relay contacts to protect them when high
power loads are switched.
If such a problem is experienced with low power AC loads, the solution is to
remove (un-solder) these capacitors from the Main board. The capacitors are
located between the relays and TB2, and are marked C8, C9, C18, C19.
To Next Page
