13
4. Wiring
Warning
Turn the power supply to the instrument off before wiring or checking.
Working on or touching the terminal with the power switched on may result in
severe injury or death due to electrical shock.
Caution
• Do not leave wire remnants in the instrument, as they could cause a fire or a
malfunction.
• Use a solderless terminal with an insulation sleeve in which the M3 screw fits when
wiring the AER-101-ORP.
• The terminal block of this instrument is designed to be wired from the left side. The
lead wire must be inserted from the left 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 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 a 24 V AC/DC power source, do not confuse polarity when using direct current
(DC).
• Be sure to connect the ground terminal to earth for safety (D-class grounding).
Keep the grounding of this unit separate from other electrical devices, such as motors.
• 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.
• Use the ORP Combined Electrode Sensor in accordance with the sensor input
specifications of the AER-101-ORP.
• Keep the input wires and power line separate.