Toshiba LF494 - Manual (Page 137)

TOSHIBA
6 . F 8 A 0 7 7 4
13Л Maintenance
Ш Calibration
The LR04 converter has a reference signal generating circail. This reference signal can he
used to check the zero and span of the converter for the purpose of instrumentation
maintenance or periodical inspection. Sec Chapter 9» “Calibration,'’
fuse
The fuse can be taken out by unscrewing the cap of the fuse holder. Check that the fuse is
not damaged. The fuse has to be replaced periodically. The recommended replacement
period is 3 years.
Glass tube fuse (normal blow type) 1 piece
1 A, 230 V for 100 to 240 V ac or 110 V dc power supply
2A, 25(] V for 24 V dc power supply
Dimensions: Diameter 5.2 mm x: 20 mm
Type of flise used:
Rating:
LCD display (optional)
If the characters displayed on the LCD are dimmed or blurred^ the LCD display should be
replaced. To extend the life of the flowmeter, replace the l.CD early. To check and replace
the LCD display, contact your nearest Toshiba représenta live.
Power supply unit
Llectronic components deteriorate faster when the ambient temperature is high. The life of
the power supply unit in the converter is 9 to 10 years if the ambient temperature is 40"
C y
and 3 to
6
years if it is 50" C. To extend the life of the flowmeter, we recommend you
replace the power supply unil early. Contact your nearest Toshiba representative for a
flowmeter inspection or unit replacement.
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