Simplified diagram of the heating system
6.2 Water in fuel sensor (WIF)
Multiple WIF sensors are available either Bedia or SEPAR
designed.
All sensor parts of the SEPAR-series are potential free. The
detection of water is by capacitive measurement principle.
The exact thechnical specifications for water sensors can be found in a separate manual.
6.3 Differential pressure switch
The pressure switch is fitted in the fuel line at both the inlet and the outlet, and outputs an electrical
signal when the differential pressure produced by the filter exceeds a calibrated value. The pressure
switch is used as an indicator for a highly contaminated filter element.
6.4 Relative pressure switch
The relative pressure switch is fitted at the outlet port and outputs an electrical signal when the
vaccuum in the fuel line exceeds a calibrated value (measured against ambient air pressure). The
pressure switch is used as an indicator for highly contaminated filter elements.
The function of the relative pressure switch is the same as the differential pressure switch. But the
differential pressure switch is mounted at the inlet and the outlet port and can measure the
differential pressure between inlet and outlet.
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