VII
● Service Life
Use the product within the following temperature and humidity ranges:
Temperature:
−10 to 55°C (no icing or condensation)
Humidity: 25% to 85%
When the product is installed inside a control panel, make sure that the temperature
around the product, not the temperature around the control panel, does not exceed
55°C.
The service life of this product and similar electronic devices is determined not only
by the number of switching operations of relays but also by the service life of
internal electronic components. Component service life is affected by the ambient
temperature: the higher the temperature becomes, the shorter the service life
becomes and, the lower the temperature becomes, the longer the service life
becomes. Therefore, the service life can be extended by lowering the temperature
of the product.
Be sure to install the product according to the specified conditions. Otherwise, the
heat generated by the product will cause the internal temperature to rise, short-
ening the service life. If necessary, cool the product using fans or other means of air
ventilation.
When providing forced cooling, however, be careful not to cool down the terminals
sections alone to avoid measurement errors.
● Noise Countermeasures
To prevent inductive noise, separate the wiring for the product's terminal block and
connector from high-voltage, high-current power lines. Do not run the wiring parallel
to or in the same cable as power lines. The influence of noise can also be reduced
by using separate wiring ducts or shield lines.
Install surge absorbers or noise filters in devices near the product that generate
noise (in particular, devices with an inductance component, such as motors, trans-
formers, solenoids, and magnetic coils).
If a noise filter is used for the power supply, check the voltage and current, and
install the noise filter as close as possible to the product.
Separate the product as far as possible from devices generating strong high-
frequency noise (e.g., high-frequency welders and high-frequency sewing
machines) or surges.
● Measurement Accuracy
When extending the thermocouple lead wire, be sure to use a compensating wire
that matches the thermocouple type.
When extending the lead wire of the platinum resistance thermometer, be sure to
use wires that have low resistance, and make sure that the resistances of the three
lead wires are the same.
If the measurement accuracy is low, check whether the input shift is set correctly.
● Waterproofing
The degree of protection is as shown below.
Precautions for Correct Use
Front panel IP66
Rear case IP20
Ter mi na ls IP00
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