3
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 0 to 50
(32 to 122 ) 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 where the vapors of these substances can come into direct contact with
the unit
• Please note that the ambient temperature of this unit – not the ambient temperature of the control panel
– must not exceed 50
(122 ) if mounted through the face of a control panel, otherwise the life of
electronic components (especially electrolytic capacitors) 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.
2. Wiring Precautions
Caution
• Do not leave wire remnants in the instrument, as they could cause a fire or malfunction.
• The terminal block of this instrument is designed to be wired from the upper side. The lead wire
must be inserted from the upper side of the terminal, and fastened with the terminal screw.
• Tighten the terminal screw using the specified torque. If excessive force is applied to the screw
when tightening, the terminal screw or case may be damaged.
• Do not pull or bend the lead wire on the terminal side when wiring or after wiring, as it could cause
malfunction.
• Use a thermocouple and compensating lead wire according to the sensor input specifications of
this instrument.
• Use the 3-wire RTD according to the sensor input specifications of this instrument.
• 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 a 24 V AC/DC power source, do not confuse polarity when using direct current (DC).
• When using a relay contact output type, externally use a relay according to the capacity of the load
to protect the built-in relay contact.
• When wiring, keep input wires (thermocouple, RTD, etc.) away from AC power sources or load wires.
• 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.
3. Operation and Maintenance Precautions
Caution
• Do not touch live terminals. This may cause electrical shock or problems in operation.
• Turn the power supply to the instrument OFF before 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.
