American Magnetics 185 & 186 Liquid Level Instruments (CE-Marked) - Manual (Page 72)

62 Rev. 3
Service Guide
No level reading
7.1.1 No level reading
1. Ensure that the instrument is energized from a power source of
proper voltage.
Warning
If the instrument has been found to have been connected to an
incorrect power source, return the instrument to AMI for evaluation
to determine the extent of the damage. Frequently, damage of this
kind is not visible and must be determined using test equipment.
Connecting the instrument to an incorrect power source could
damage the internal insulation and/or the ground requirements,
thereby, possibly presenting a severe life-threatening electrical
hazard.
2. Verify continuity of the line fuse, F1, located on the instrument
printed circuit board.
Warning
This procedure is to be performed only when the instrument is
completely de-energized by removing the power-cord from the power
receptacle. Failure to do so could result in personnel coming in
contact with high voltages capable of producing life-threatening
electrical shock.
a. Ensure the instrument is de-energized by disconnecting the
power cord from the power source. Disconnect the power cord
from the connector located on the rear panel of the instrument.
b. Remove the instrument top cover and check the fuse F1 for
continuity.
c. If the fuse is bad, replace with a 315 mA IEC 127-2 Type F
Sheet II 5x20mm fuse.
Caution
Installing fuses of incorrect values and ratings could result in
damage to the instrument in the event of component failure.
d. Replace the fuse and securely fasten the instrument top cover.
Reconnect the power-cord.
3. Verify the input voltage selector switch on the instrument’s printed
circuit board is in the proper position for the available power
receptacle at the customer’s facility. Checking the input voltage