SECTION VIII
8.0 GAUGING TAPE REPLACEMENT (With or without new sensor attached)
The gauging tape used for the Trimode restricted gauging system is similar but not inter
-changeable with the gauging tapes used for closed gauging systems.
The tapes used are bright white faced steel core type, which have been encapsulated with a
tefzel jacket. (Tefzel is a registered trade name of the Dupont Corporation). The tapes is terminated
at the display electronics hub PCB module connection points, by soldered leads within tape reel internal
core. The sensor is connected to the tape be means of a quick connect plug to the tape socket plug.
As with all tefzel coated MMC gauging tapes, the outer surfaces are factory treated to render
the surfaces of the tapes anti-static properties.
The patented process to achieve the desirable anti-static condition, is not defeated by tape
wiping or cleaning with standard petroleum based solvents.
Gauging tape replacement is not difficult, but requires careful attention to the travel path of
tapes as it exits from the tape reel assembly, passes over the interior guide rollers, cursor pin assembly,
anti-chafing rollers and on through the wiper housing .
8.1 To replace a tape, remove the machine screws from the hub cover and lay it to the side.
8.2 Remove battery from the battery holder, unplug battery cap and storage barrel by loosening
cap nuts on wiper housing.
8.3 Remove round vapor seal assembly on top of the tape wiper by backing off the Allen set screws
which hold it in place and place tape wiper knob in “Off” position.
8.4 Completely unreel tape and sensor head. Note that the end of the metallic tape inside the hub
is grounded by a machine screw and washer. The tefzel tape cover at this point has been
trimmed away to permit good ground contact. Also note that the tape’s outer conductors are
spliced to two to the wires that originated at the circuit board. (Note the color of these wires
so that when reassembling, the correct wire will be connected to the top and bottom tape
conductors).
8.5 Detach the tape at the hub by removing the grounding machine screw and unsolder the splice
connections. Pull the tape through the slot in the side of the hub and out through the tape
wiper.
8.6 Attach a new tape to the hub by reversing the above procedure making sure that the tape
numerals face in the same direction as the previous tape numeral faced. Make sure that the
splices are well insulated (use shrink tubing) and that the grounding machine screw and
washer are fastened tightly to provide a good metallic ground between center ground tape
conductor and hub.
8.7 Replace battery, battery cap and hub cover. Connect old sensor to tape, if not supplied with
Replacement. Rewind tape on reel.
8.8 Replace tape vapor seal assembly and sensor storage barrel.
8.9 Perform a temperature calibration in accordance with Section VII.
Page 14
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