(b)  
The terminal block provides a means of connecting the wiring harness to the tank unit. Different connector sizes eliminate any chance of installation error.

 (c)  
An overcenter type wiring strain relief clamp secures the wiring to the tank unit and provides quick change capability.

 (d)  
Insulated end caps minimize the chance of the tank unit shorting to ground. They also provide capacitance fringing control.

 (e)  
Two mounting brackets made of nonferrous glass-filled nylon, attach each tank unit to the wing structure.

 (3)  
The tank unit senses the fuel level in the fuel tank. It is a linear, capacitance type sensor. Tank characteristics are accounted for by computer software. The concentric aluminum tubes of the tank unit act as plates of a capacitor, and the dielectric is air and/or fuel depending on the quantity of fuel in the fuel tank. This air to fuel ratio produces a capacitance value which is used to compute the volume of fuel.

 B.
Compensator (Fig. 3)

___________
 (1)  
One compensator is installed in each fuel tank. All compensators are the same. The compensators are similar in construction and mounting provisions to the tank units.

 (2)  
Each compensator contains three concentric tubes, or electrodes, which attach to the support tube. A tuning plate fits on top of the electrodes. Rotating the tuning plate varies the distance between the electrodes, providing a means of calibration. Setscrews lock the plate in position to prevent rotation during normal operation. Holes in the bottom shield allow free flow of fuel through the compensator. This prevents contaminant build-up.

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 28-41-00
 ú CONFIG ú 08 Page 4 ú Jan 28/02

A

757
MAINTENANCE MANUAL

TANK UNIT
TANK UNIT
SEE A
SEE A
TANK UNIT
TANK UNIT
SEE A
SEE A
ASEE TANK UNIT  ASEE TANK UNIT 
ASEE TANK UNIT  TOP COVER 
MOUNTING CLAMP
TERMINAL BLOCK BSEE GROUND SCREW (8-32 THREAD) HI-Z SCREW (6-32 THREAD)  WIRING HARNESS (10-32 THREAD) LO-Z SCREW 
ELECTROSTATIC SHIELD 
RELIEF CLAMP WIRING STRAIN  INNER ELECTRODE OUTER ELECTRODE 
MOUNTING CLAMP 
END CAP 
A TANK UNIT (EXAMPLE) 
FQIS Tank Units Figure 2 (Sheet 1) 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. GUN 001-010 ú
　
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