EPSILON ES2,ES4
11
Pic. 7.1 The general view of the “Epsilon” FLS
Measuring of fuel level is made with help of measuring head with the probe, immersed into the
fuel. The probe is a coaxial capacitor, which is made of an aluminum tube (external electrode)
and insulated copper string (internal electrode). The required tension of the string is supported
by a spring which is situated in contact of the probe’s connector.
Mounting of the sensor is performed with help of self-drilling screws, which fix the sensor’s
flange on the tank. Impermeability of the fit of measuring head is provided by sealing ring,
located in the front groove.
The interface cable is protected from mechanical damage by a flexible metal sleeve or
corrugated pipe.
The sensor safety is provided by such facilities:
fuse for protection against overloads and short circuits;
intrinsically safe measuring circuit with normalized values of voltage, inductance,
capacitance and resistance;
multi-level protection of charging and interface circuits;
metal sheath with a proper degree of protection (IP56 according to ГОСТ14254);
compound filling of the measuring head’s membrane.
7.2 Work of FLS
The sensor’s probe during the immersing into fuel perform the function of a variable capacitor
whose capacitance linearly depends on the level of it’s filling by fuel.
The measuring head of the sensor performs a linear transformation of the probe’s capacitance
to digital code of fuel level, the processing of received digital data with averaging of
measurement results, taking the temperature of the fuel tank and delivery of the data in a
Measurement head
Hermetic cable input
Interface cable
Sealing rubber ring
Flange
Gasket
Zonde
Plug
Cap of Plug
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