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1. Precautions on Handling the Product
Warning This product has no explosion-proof structure. Do not use the product in a
place where flammable or explosive gas is generated.
1) Check the identification plate after unpacking to confirm that the product is what you
ordered. In the event the product is not what you ordered, please contact us.
2) Check the product for any damage. In the event of any damage, please contact us.
Damage may be due to an accident during transportation.
3) Do not apply excessive force the product. Impacts from dropping or tipping the product
may cause damage.
4) Do not place any object on the product. Doing so may create excessive force on the
product leading to damage.
5) When applying paint to the product, if paint is applied on the identification plate,
information on the plate will be covered by the paint, hindering maintenance.
6) Do not use or store the product in a corrosive atmosphere (such as NH
3
, SO
2
, and Cl
2
).
Corrosive gas may penetrate the product, causing corrosion or damage to internal parts.
7) Avoid using or storing the product in a place where large vibration exists. In the event of
exposure, remove the source of the vibration or prevent the vibration from being
transmitted to the product.
2. Product Outlines
2.1 Product objectives
This product is a sensor for measuring liquids, powder, grains, and slurry in a tank or
hopper at the level where the detector is mounted by means of the static capacitance
(C) of the measuring instrument.
2.2 Operation Principle
A static-capacitance type level sensor is composed of electrodes (a ground electrode
and detection electrode) and electronic circuits, with the electrodes constituting a
capacitor. With the ground electrode contacting a tank, a capacitor including the tank is
formed. Conditions such as shape, dimensions, layout, and peripheral situations
determine the capacitance of the capacitor. If conditions other than the specific
permittivity (*1) of the measured objects are the same, the capacitance of the capacitor
depends on the specific permittivity of the measured objects. If we take the capacitance
for air as a reference, we can distinguish the difference in capacitance created by
measured objects with different values of specific permittivity. In addition, by taking
either one of the two measured objects with different specific permittivity as a reference,
we can distinguish the two objects. This product detects the static capacitance of
measured objects and outputs signals.
*1 Specific permittivity is the ratio of the static capacitance of a capacitor where an insulating substance
(dielectric) fills the space between its electrodes to the capacitance of the capacitor where a vacuum exists
between its electrodes with the dielectric removed. Specific permittivity is a constant depending on the
types of materials.
