Quote:
Originally Posted by leman_opc
I'm currently planning an install of hfs3 system on my Opel Astra OPC (=Astra VXR in Vauxhall range), and the best place for tank/pump we found is behind the front bumper.
With the tank installed there I'll be not able to see the water level (visually, so to say), so to have an idea when to fill the tank I need a water level sensor.
My question is - from the manual I'm unsure how the supplied water level sensor works. Does the sensor activate the failsafe immediately when the low water level is detected or there is a kind of intermediate state (water is low as indicated with a blinking yellow led on the gauge but the system still working yet with no failsafe on)?
Also, would be great to know the logics behind the water level sensor operation in hfs3 (the sensor itself appears to be a discrete output one so I would imagine hfs3 controller should have a kind of algorithm to filter out the low water level signals due to simple water movements back and forth on cornering etc.)...
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You are correct about the level sensor, it is not just on/off.
The system monitors the duty cycle of the sensor during the low level period. The gauge led will flash in sync with the sensor's arm but will not shut the system off until the duty is over 50% for a continuous period of 20 seconds.
This algorithm will allow early warning but more cutting off the system.
If water level is low at start up, the system will not turn on, just illuminates the "low level" led on the gauge. The system can only be reset by filling up the tank.