Honeywell HERMetic UTImeter Gtex Chem IIC, Руководство по эксплуатации и обслуживанию, Страница: 44 / 83

50489/GTEX Chem IIC/1805 UTImeter Gtex Chem IIC
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9.6. Display unit replacement
THE REPLACEMENT OF THE DISPLAY UNIT
DOES NOT REQUIRE TO RE-CALIBRATE THE
TEMPERATURE.
9.6.1. 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 10-10.
− 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 10-10.
− Disconnect the tape plug, item (C) shown on
Figure 10-5.
9.6.2. 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 10-10.
− Reinstall the battery holder with the 2 screws
(A) of Figure 10-10. Refer to page
Error!
Bookmark not defined.
.
− Check that the unit is working properly, as
described in 9.9.
(A)
(B)
Figure 10-10
9.7. Button handle replacement
CAUTION: THE BUTTON HANDLE IS A SAFETY
PART. IT MUST BE REPLACED BY A GENUINE
SPAREPART ONLY.
An incorrect replacement may impair the safety of
the device.
− Refer to Figure 13.4: electronic box
assembly TS 10190 at the end of the
manual to identify components.
− Disconnect the tape from the electronic
box as specified in section 10.4.2.
− •Unscrew the 2 remaining screws that
secure the reel axle.
•Remove the old button handle subassembly.
•Assemble the button handle its spring and the
finger for handle subassembly
•Pass it through the electronic box
•Assemble the knob for handle onto the button
handle and align their holes.
•Place the dowel pin and secure it by mounting the
external part of knob.
•Follow in the reverse order the instructions of
subsection 10.4.2 to reinstall the electronic box.
9.8. Storage tube replacement
Always reassemble the storage tube to the
housing in the vertical position to allow the Oring
to seat properly in the tube.
9.9. 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.