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13. Maintenance and Inspection
Do not conduct wiring work when
power is
applied
.
Do not touch the LF232 main body when
high
temperature fluid
is being measured.
DON’T
Wiring while power is applied can
cause electric shock.
DON’T
The fluid raises the main body
temperature and can cause burns
when touched.
13.1 Maintenance
Mag-Prover Calibration / Check
The LF232 converter has a built-in reference signal calibration and verification circuit that allows
you to re-verify the original flowmeter flow lab calibration without the need for external devices.
This reference signal can be used to check and adjust the circuit to perform zero and span
calibration of the converter itself and for the purpose of maintenance and periodical inspection. See
9. “Mag-Prover Calibration.”
Check / Replacement of fuse
Fuse can be taken out by turning the top of the fuse holder counterclockwise. Check that the fuse is
not damaged. In addition, fuse has its own life and it must to be replaced periodically.
(Recommended replacement cycle is about 3 years.)
Type of fuse used: Glass tube fuse (normal blow type)
Rating: In the case of power supply 100 to 240 VAC and 110VDC
1A, 250V 2 pieces
In the case of power supply 24VDC and 100 to 120 VAC for large meter size
detector
2A, 250V 2 pieces
In the case of power supply 24VDC for large meter size detector and 24VDC
for partially filled pipes detector
3A, 250V 2 pieces
Dimensions: Diameter 5.2 mm × 20 mm
Check / Replacement of display unit
If the characters displayed on the LCD become thin or blots come out, the life of the LCD is
reached. 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 your nearest
Toshiba representative.