HM-90S Series
HITROL CO., LTD.
9
Maintenance
Failure Check
Precautions
for Removal
Regular inspection helps in using the product in the optimal condition. As such, it is
recommended to conduct annual inspection and maintenance.
■
Cage
The cage is designed to endure high temperature, and its safety is confirmed with
nondestructive and water-pressure tests. However, corrosion can lead to leakage in a
harsh working environment. As such, regular visual inspection and test are required.
■
Housing
Check the sealing of the housing cover and wire inlet to prevent dust or rain from
penetrating. Also, replace the sealing if it is old or damaged.
Exposure to excessive heat or humidity may damage the wire inlet insulation. It may
lead to short circuit, so check the wiring and replace it if necessary in advance.
If the terminal is not tightened, vibration may cause it to loosen.
Prepare a spare switch block so that the process can continue even if there is a
problem with the switch block.
The product can be removed from the vessel to check the contact of level switch
using liquid (e.g., water) and then reconfigure it.
For maintenance, check the presence of measure object in the tank and remove it.
Learn how to adjust the switch block first, and contact the headquarters or
dealership for any replacement required.
If there is a problem with operation, check the following first.
■ Remove the cover and check if the output of the micro switch works fine.
Connect a tester to COM and N.O or N.C to check the output, and if there is a
problem, replace the micro switch.
■ After checking the micro switch, remove the product from the vessel and move the
float up and down to see if the switch block magnet responds to the core.
■ Recheck if the float and level of object to be measured are leveled.
■ Recheck if the float is positioned on top of the object to be measured.
■ Check the level and presence of measure object in the tank before removing it.
■ Wear gloves when removing it, to prevent a burn.
■ Make sure that any O-ring or gasket is not damaged while opening or closing the
cover of product.
■ Unlock the lock key before removing the cover.
■ Disconnect the cable before removing the snap switch.
If there is explosive gas atmosphere, do not open the cover.
