50461/GTEX MMC/1111
UTImeter Gtex MMC
48
11.7 Coated aluminium parts
PA 11: Rilsan = blue, grey or yellow colour
The coating should be subject to regular and careful inspection. The continued used of the apparatus should
not be permitted if inspection reveals that the protective material has become damaged to the extend that
the underlying protected metal is visible, until such damage has been satisfactorily repaired.
11.8 Winding action becoming stiff
If after repeated use the winding action is becoming slightly stiff apply the following simple process:
engage the tape cleaner (position "UP"), with the sensor retained in the storage tube,
slacken the tape a few turns, typically 10,
gently shake the instrument to free up the tape within the tape housing,
wind the tape again and disengage the tape cleaner (position "DOWN").
11.9 Electrical checking of the tape assembly
Test for grounding
Remove the battery holder as described in
section 10.3.
Measure the resistance between the ground (-)
terminal (as shown on Figure 11-1) of the
electronic circuit and the tube of the sensing
probe; the resistance should be less than 10
. If it is higher, the steel tape might be broken
or the connection between the sensing probe
circuit and the sensing probe tube might be
interrupted.
Test for short-circuit
Disconnect the tape at both ends: display unit
side and sensing probe side (see sections
10.4.1 and 10.4.2).
Measure the resistance between each
conductor red-white, red-black, white-black.
This resistance should be infinite as an open
circuit. If not, the tape might be defective.
Test for open-circuit (continuity)
Disconnect the tape at the sensing probe side
see 10.4.1).
Measure the resistance of each conductor of
the tape (between red and red, white and
white, etc.).
The resistance should be less than 15
. If
not, the tape might be broken. To replace the
tape see section 10.4.
Figure 11-1
