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3
Installation Precautions
Caution
This instrument is intended to be used under the following environmental conditions
(IEC61010-1): Overvoltage category
, Pollution degree 2
Ensure the mounting location corresponds to the following conditions:
• A minimum of dust, and an absence of corrosive gases
• No flammable, explosive gases
• No mechanical vibrations or shocks
• No exposure to direct sunlight, an ambient temperature of -10 to 55
(14 to 131 )
that does not change rapidly, and no icing
• An ambient non-condensing humidity of 35 to 85 %RH
• No large capacity electromagnetic switches or cables through which large current is flowing
• No water, oil or chemicals or the vapors of these substances can come into direct
contact with the unit.
• When installing this unit within a control panel, please note that ambient temperature of
this unit – not the ambient temperature of the control panel – must not exceed 55
(131 ). Otherwise the life of electronic components (especially electrolytic capacitor)
may be shortened.
Note:
Avoid setting this instrument directly on or near flammable material even though
the case of this instrument is made of flame-resistant resin.
Wiring Precautions
Caution
• Do not leave bits of wire in the instrument, because they could cause a fire and
malfunction.
• When wiring, use a crimping pliers and a solderless terminal with an insulation sleeve
in which an M3 screw fits.
• Tighten the terminal screw using the specified torque. If excessive force is applied to
the screw when tightening, the screw or case may be damaged.
• This instrument does not have a built-in power switch, circuit breaker and fuse. It is
necessary to install a power switch, circuit breaker and fuse near the instrument.
(Recommended fuse: Time-lag fuse, rated voltage 250 V AC, rated current 2 A)
• For wiring of the AC power source, be sure to use terminals as described in this manual.
If the AC power source is connected to incorrect terminals, the unit will be burnt out.
• Do not apply a commercial power source to the sensor which is connected to the
input terminal nor allow the power source to come into contact with the sensor.
• When using DC voltage and current input, do not confuse polarity when wiring.
• Keep the input/output wires and power line separate.
Operation and Maintenance Precautions
Caution
• Do not touch live terminals. This may cause an electrical shock or problems in operation.
• Turn the power supply to the instrument OFF when retightening the terminal or cleaning.
Working on or touching the terminal with the power switched ON may result in severe
injury or death due to electrical shock.
• Use a soft, dry cloth when cleaning the instrument.
(Alcohol based substances may tarnish or deface the unit.)
• As the display section is vulnerable, be careful not to put pressure on, scratch or strike
it with a hard object.