HM-90&95-Ex Series
HITROL CO., LTD.
15
Failure Check
Cautions for
Removal
Transportation
and Cautions
for Assembly
Cautions for
Installation
Cautions for
Grounding
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.
(HM-90-Ex Series)
■ Recheck if the float is positioned on top of the object to be measured.
(HM-95-Ex Series)
■ Pay special attention to prevent any impact on the product during transport or assembly.
The impact may directly lead to a failure.
■ When attaching the product to a vessel, pay attention to prevent any damage to the assembly
packings.
■ Check the level and presence of object to be measured in the vessel before removing it.
■ The product may be overheated so wear gloves to prevent burns.
■ If there is explosive gas in the atmosphere, do not open the cover.
■ Make sure that any O-ring or gasket is not damaged while opening or closing the cover.
■ To remove the cover of an ex-proof product, release the lock key first.
■ Use the same standard flange or screws.
■ 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 the temperature of the content and the pressure of the
container.)
■ Install an ex-proof product in an ex-proof zone.
Make sure that the product would not be subject to any high impact during transport or
assembly.
External ground is located on top of the cable entry, and the grounding wire to connect
external ground must be 4 mm
2
(4 mm SQ). (Internal ground is connected before shipment.)
Make sure to insert a washer if the terminal lug is removed from the ground
terminal and then reconnected (to prevent loosening).