HR-30 Series
HITROL CO., LTD.
11
Maintenance
method
Precautions for
separation
■ The lines should be separated after checking the level inside the tank and whether or not there is
any measure object in the tank.
■ Gloves should be worn when separating the lines in the case of products for high temperatures
because burns may occur.
■ The cover of the product should not be opened in cases in which there is an explosive gas
atmosphere.
■ In the case of explosion-proof products, the SET SCREW (explosion-proof key) should be unlocked
before opening the COVER.
■ The lines should be separated after turning off the power.
■ When opening or closing the cover of the product, be attentive to prevent causing damage to the
O-ring or the gasket.
The major parts of HR-30 Series to be inspected are the FLOAT and REED S/W in the sensor element.
The life spans of major parts vary with user environments and can be used in optimum conditions
through periodic inspections.
Therefore, the user should maintain and repair the product through periodic inspections conducted
at least once per year.
The appearance of the product should be visually checked to see if there is any damage, and if there
is scale caused by measure objects, it should be removed for the smooth operation of the FLOAT. The
REED S/W can simply be inspected using a Digital Multimeter as follows.
Select the buzzer of the Digital Multimeter and connect it to one of product
’
s terminal blocks, E1
–
E4,
and the COM terminal.
When the FLOAT is moved, if the buzzer rings at the lower or upper limit contact point, the REED S/W
is normal.
When checking contact point conditions based on resistance, if the Digital Multimeter indicates 0Ω
when the FLOAT is moved, the REED S/W is normal in the NC (Normal Close). In the NO (Normal
Open) state, the Digital Multimeter indicates 0Ω when the REED S/W is normal.
Moreover, when the product is used for highly viscous liquids, the sensor element should be
periodically cleaned.
For maintenance, the power of the product should be completely turned off
before inspection.
