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7.2 Maintenance and Inspection Items
Periodic maintenance and inspection is necessary for reliable measurement over a long period of time.
Since the density meter has no mechanically moving parts, however, it does not require replacement of
mechanism elements in a normal operating environment.
Compare the density measured value and the manually analyzed value in the cycle shown in Table 7.1.
If necessary, implement the span calibration after implementing the zero calibration. The spare parts
that must be kept on hand are the fuses in Table 7.2.
Comparison of density meter measured value
with manually analyzed value
Materials accumulated or entangled, or
physical damage
[NOTE]
◆ If the density meter measured value deviates from the manually analyzed value to the extent of causing
obstacles, implement the span calibration (changing the density multiplier C) while referring to Section
6.5.
◆ If the density meter measured value greatly deviates from the manually analyzed value by less than
half or more than twice, implement the span calibration after implementing the zero calibration while
referring to Section 6.4 and 6.5.
◆ When the density meter is used in an application where the process fluid contains plenty of fur or fiber,
these substances may accumulate or entangle in the insertion probe area and thus perform the
maintenance and inspection operation, and cleaning periodically.
◆ Take extra care not let the applicators (antenna) hit the hard object.
Name
Fuse
[NOTE]
◆ Fuses are parts with expected life span. Therefore, replace them periodically. (Recommended
replacement cycle: about 3 years)
◆ In general, the service life of an electronic part becomes shorter at higher ambient temperature.
Electrolytic capacitors are used in the converter and their service life is about 10 years at the ambient
temperature of 20°C or about 3 years at 50°C. For stable use of the meter for many years, it is desirable
to replace these parts in time. When replacing the capacitors, please contact Toshiba's Service Dept.
◆ In the event that the characters on the LCD display becomes weak in contrast or edge, it is considered
that the LCD display unit has reached the end of its life. Although such unsatisfactory visibility may not
affect the performance of the density measurement, the display unit should be replaced if it interferes
with the operation. When replacing the display unit, contact Toshiba's Service Dept.
Table 7.1 Maintenance and Inspection Items
Item
Table 7.2 Spare Parts
1A(M),250V cartridge, glass tubular fuse,
5.2mm outer dia. x 20mm long
Cycle
When necessary
When necessary
Specifications
69
6 F 8 A 0 7 8 7
Remarks
At least three samples are
desirable.
Qty
2
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