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Precautions
■ Use the same standard flange or screw.
■ Make sure to insert washers between bolts and nuts to prevent loosening.
for
■ Make sure to insert gaskets between flanges. (Select the gaskets in consideration of
Installation
temperature of content and pressure of vessel.)
■ Install an Ex-proof product only in an Ex-proof zone.
Failure
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
Check
connecting COM with N.O or N.C using a tester.)
■ 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.
Maintenance
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.
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.
HITROL CO., LTD.
HM-30, 90 Series
Replace the snap switch if necessary.
14
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