50461/GTEX MMC/1111
UTImeter Gtex MMC
42
10.7 Display unit replacement
THE REPLACEMENT OF THE DISPLAY UNIT
DOES NOT REQUIRE TO RE-CALIBRATE THE
TEMPERATURE.
10.7.1 Disconnecting the old display unit
Unscrew with the 2.5 Allen key the 2 screws
(A) of the battery holder and pull it out as
shown on Figure 10-11.
Unscrew with the 2.5 Allen key the 4 screws
(B) of the display unit and pull it gently out of
the electronic box, as shown on Figure 10-11.
Disconnect the tape plug, item (C) shown on
Figure 10-6.
10.7.2 Connecting the new display unit
Connect the tape plug to the new display unit.
Put back the new display unit in the electronic
box; tighten the 4 screws (B) of Figure 10-11.
Reinstall the battery holder with the 2 screws
(A) of Figure 10-11. Refer to Figure 10-4 page
38.
Check that the unit is working properly, as
described in 9.8.
(A)
(B)
Figure 10-11
10.8 Verification and certification
of tapes
The tape has to be periodically inspected for
breaks, kinks, wear and illegible numbers.
As the tape is a cable it might be necessary to
check its electrical conformity. Refer to section
11.9. It is necessary also to check it for accuracy
regularly according to current National or
International Standards, as API "Manual of
Petroleum - Measurement Standards - Chapter 3
- Tank Gauging - Section 1A - Standard practice
for the manual gauging of petroleum products in
stationary tanks" or IP "Petroleum Measurement
Manual - Part III - Manual Tank Gauging - Section
1 - Non-Electrical Methods" or relevant ISO
standards.
In such a case it is important to remember that the
bottom of the sensing probe is 4 mm lower than
the zero of the tape, thus to assure that the
electrical zero coincide with the tape zero.
It is also important to remember that the nominal
tension at which the tape was produced is marked
on each beginning of tape and is normally 6 N
(1,3 lb). If tensioned at 44,5 N (10 lb) as per API
this will result in a additional elongation up to 3.7
mm over 30 meters.
This periodical verification can be done at the
factory or in a Service Station.
