Safety Precautions
6
Digital Temperature Controllers (Simple Type) User’s Manual (H211)
z Safety Precautions
*1 A SELV circuit is one separated from the power supply with double insulation or reinforced insulation, that
does not exceed 30 V r.m.s. and 42.4 V peak or 60 VDC.
*2 A class 2 power supply is one tested and certified by UL as having the current and voltage of the
secondary output restricted to specific levels.
CAUTION
Minor injury due to electric shock may occasionally occur.
Do not touch the terminals while power is being supplied.
Electric shock, fire, or malfunction may occasionally occur.
Do not allow metal objects, conductors, cuttings from installation
work, or moisture to enter the Digital Controller.
Minor injury from explosion may occasionally occur.
Do not use the product where subject to flammable or explosive gas.
Minor electric shock, fire, or malfunction may occasionally occur.
Never disassemble, modify, or repair the product or touch any of the
internal parts.
CAUTION - Risk of Fire and Electric Shock
(a) This product is UL recognized as Open Type Process Control
Equipment. It must be mounted in an enclosure that does not
allow fire to escape externally.
(b) More than one disconnect switch may be required to
de-energize the equipment before servicing.
(c) Signal inputs are SELV, limited energy.
*1
(d) Caution: To reduce the risk of fire or electric shock, do not
interconnect the outputs of different Class 2 circuits.
*2
If the output relays are used past their life expectancy, contact fusing
or burning may occasionally occur.
Always consider the application conditions and use the output relays
within their rated load and electrical life expectancy. The life
expectancy of output relays varies considerably with the output load
and switching conditions.
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