Toshiba LF600F - Manual (Page 145)

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13.1 Maintenance
■ Calibration
The converter for electromagnetic flowmeter: LF60*F has a built-in reference signal generation
circuit that generates dummy flow rate signals.
This reference signal can be used to check the
zero and span of the converter for the purpose of instrumentation maintenance or
periodical inspection. See 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.
Type of fuse used: Glass tube fuse 1 piece
Rating: ®0.8A(T)/250V for 100 to 240 Vac or 1 lOVdc power supply
(D2A/150V for 24Vdc power supply
Dimensions: Diameter 5mm x 20 mm
Melting time characteristic: ©Time Lag
©Medium-Acting (Normal blow)
Note: Use a fuse that complies with the Electrical Appliance and Material Safety Law.
Check/Replacement of the display unit
When characters displayed on the LCD display become thin or blots come out, please adjust the
setting of LCD's display density. If the display is still not improved, the display unit comes to
the end of its life. Please replace the display unit with a new one. In order to use the display
unit stably for a long time, it is preferable to replace it early. For inspection and replacement,
please contact you’re nearest Toshiba representative.
Power supply unit (also used for excitation board)
Electronic 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,
and 5 to 6 years if it is 50° C.
To extend the life of the flowmeter, we recommend you replace
the power supply unit early.
Contact you're nearest Toshiba representative for a flowmeter inspection or unit
replacement.
Product disposal
The main body or parts of the converter for electromagnetic flowmeter 1: LF60*F must be disposed
of, according to the rules and regulations of your local government.
Especially if you dispose of electrolytic capacitors to replace parts, have it done by an
agency which is licensed to handle industry waste materials.
Operative life
The operative life of this flowmeter is 10 years from the date of shipment.
The life of the flowmeter differs depending on the environmental conditions and the way it was
used. To extend the life of the flowmeter, inspect the flowmeter periodically and clean or
replace components if necessary.
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