Operating Environment
1. Never use in an atmosphere of explosive
gases.
The structure of magnetic field resistant 2-color display solid
state auto switches is not intended to prevent explosion. Nev-
er use in an atmosphere with an explosive gas since this may
cause a serious explosion, and therefore, should absolutely
not be used under these conditions.
Warning
1. Do not use around direct current welders.
Magnetic field resistant 2-color display solid state auto
switches will malfunction or magnets inside cylinders/actua-
tors will become demagnetized.
2. Do not use in an environment where the auto
switch will be continually exposed to water.
Although the sensor unit of magnetic field resistant 2-color dis-
play solid state auto switches satisfies IEC standard IP67 con-
struction, do not use auto switches in applications where con-
tinually exposed to water splash or spray. Poor insulation or
swelling of the potting resin inside auto switches may cause
malfunction.
3. Do not use in an environment with oil or
chemicals.
Please consult with SMC if auto switches will be used in an
environment with coolant, cleaning solvent, various oils or
chemicals. If magnetic field resistant 2-color display solid state
auto switches are used under these conditions for even a
short time, they may be adversely affected by improper insula-
tion, malfunction due to swelling of the potting resin, or hard-
ening of the lead wires.
4. Do not use in an environment with tempera-
ture cycles.
Please consult with SMC if magnetic field resistant 2-color dis-
play solid state auto switches are used where there are tem-
perature cycles other than normal temperature changes, as
there may be adverse effects inside the auto switches.
5. Do not use in an area where surges are gen-
erated.
When there are units (solenoid type lifter, high frequency in-
duction furnace, motor, etc.) which generate a large amount of
surge in the area around cylinders/actuators with magnetic
field resistant 2-color display solid state auto switches, this
may cause deterioration or damage to the auto switch’s inter-
nal circuit elements. Avoid sources of surge generation and
disorganized lines.
6. Avoid accumulation of iron waste or close
contact with magnetic substances.
When a large amount of iron waste such as machining chips
or spatter is accumulated, or a magnetic substance (some-
thing attracted by a magnet) is brought into close proximity
with a cylinder/actuator with auto switches, it may cause the
magnetic field resistant 2-color display solid state auto switch
to malfunction due to a loss of the magnetic force inside the
cylinder/actuator.
Caution
1. Perform the following maintenance periodi-
cally in order to prevent possible danger
due to unexpected magnetic field resistant
2-color display solid state auto switch mal-
function.
1) Secure and tighten magnetic field resistant 2-color display
solid state auto switch mounting screws.
If screws become loose or the mounting position is disloca-
ted, retighten them after readjusting the mounting position.
2) Confirm that there is no damage to lead wires.
To prevent faulty insulation, replace auto switches or repair
lead wires, etc., if damage is discovered.
Maintenance
Caution
1. Leakage current is larger than the conven-
tional models.
When this auto switch is used to replace a conventional mod-
el, input devices sometimes cannot detect the OFF of the auto
switch.
When OFF current of PLC is less than the auto switch
leakage current 1 [mA]
Example) PLC that cannot use 2-wire type
2. Please contact SMC for information about
water resistance and flexibility of lead wires.
3. The resin case may discolor depending on
the operating environment.
Although the resin case may be discolored by sunlight due to
the characteristics of its material, it does not affect the
strength and other characteristics.
Caution
Others
Magnetic Field Resistant 2-Color Display Solid State Auto Switch
Specific Product Precautions 2
Be sure to read this before handling. Refer to back pages 1 and 2 for Safety Instructions,
“Handling Precautions for SMC Products” (M-E03-3) for Auto Switches Precautions.
Back page 4
D-P3DW-A.qxd 08.9.19 2:36 PM Page 15
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
