HM-30, 90 Series
HITROL CO., LTD. 14
Regular inspection ensures optimal performance of product. Take regular inspection and
maintenance at least every year.
■ Chamber
- The chamber is designed to endure high temperature and pressure, and its safety is confirmed
with non-destructive and water-pressure tests. However, corrosion can lead to leak in a harsh
working environment, so regular visual check and test are required.
■ Housing of Switch
- Check the sealing of housing cover and wire inlet to prevent penetration of dust or rain and
replace the sealing if it is old or damaged.
- Exposure to excessive heat or humid may damage the insulation of wire inlet. It may lead to short
circuit, so check the wiring and replace it if necessary in advance.
- Tighten the terminal carefully or it may be loosened because of vibration.
- Continuous process operation may be hindered by failure of switch block, so prepare a spare switch block.
- Remove the product from the vessel and check and reset the contact of level switch using a liquid
(ex. Water) on the process connection.
If there is a problem with operation, check the followings first.
■ Remove the cover and check the output contact of snap switch. (Check the output by connecting
COM with N.O or N.C using a tester.)
Replace the snap switch if necessary.
■ After checking the snap switch, remove the product and move up or down the displacer and
recheck the contact with the tester. When moving up of down the displacer, check the internal core
(magnet) and the fixed magnet on the switch block.
■ Recheck if the measuring point of fabricated product and level of measure object are leveled.
■ When moving up or down the displacer, check if the extension spring is correct displaced.
■ Use the same standard flange or screw.
■ Make sure to insert washers between bolts and nuts to prevent loosening.
■ Make sure to insert gaskets between flanges. (Select the gaskets in consideration of temperature of
content and pressure of vessel.)
■ Install an Ex-proof prodct only in an Ex-proof zone.
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.
Do not insulate the housing and cooling fin.
Precautions
for
Installation
Failure
Check
Maintenance
