Each installed HLS/LLS corresponds to an open collector status output. The level sensing devices (HLS/LLS) and the quantity sensing devices (ACP) are electrically independent, e.g. The SCU acts as interlink between the ACP's, HLS's and LLS's and the aircraft indicator (s).
The ITH assemblies are not covered by the FQIS System ETSO. The signal of the ACPs, HLSs and LLSs is transmitted through a prefabricated coaxial cable to the tank break though connector with uncritical cable length. The LLS is also a micro power device of <20 micro joules / 10mA. The deflection coefficient is depending upon a submerged or non submerged optical device. The LLS is an optronical device detecting the deflection of a light beam by means of a photo sensitive semiconductor. The HLS is also a micro power device of <20 micro joules / 10mA. The HLS is an optronical device detecting the deflection of a light beam by means of a photo sensitive semiconductor. The cable length between sensor and conditioner is uncritical due to digital signal transmission. As a micro power device the ACP matches latest safety regulations (< 20 micro joules / 10mA) following AC-25.981-1C. A fixed and an adjustable mounting clamp together with a isolating spacer is used to attach the probes to the existing mounting clamps. The outer tube is always at ground potential and is acting as electrostatic shield. A small housing with integral electronics is attached to the outer tube. The probe is a one piece design consisting of 2 integral coaxial tubes positioned with Teflon spacers.
Conditioned electrical signal values representing the fuel quantity and fuel level state(s) are available for cockpit indicator display(s). The FQIS is a multi-probe active capacitance device used to determine the fuel quantity and optronic devices to detect a high and low level fuel state in aircraft tanks.ĭigital capacitive probe values and the level sensing signal(s) are monitored by a fuselage mounted electronic signal conditioner.
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