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Safety Precautions
Be sure to read the precautions and information common to all Snap Action and Detection Switches, contained in the Technical User’s Guide,
“Snap Action Switches, Technical Information” for correct use.
Precautions for Safe Use
Handling
The Switch has a ceramic casing. Do not drop the Switch from a
height of 30 cm or more. Doing so will break the casing.
? Connect nickel-plated solderless terminals to the TZ. Each terminal
must be secured on the TZ with M3.5 nut.
? Make sure that the ceramic case is free of metal powder or other
? Do not use the switch in locations subject to hot water (greater than
60 ° C) or in water vapor.
? Do not use the switch outside the specified temperature and
atmospheric conditions.
The permissible ambient temperature depends on the model.
(Refer to the specifications in this catalog.) Sudden thermal
changes may cause thermal shock to distort the switch and result
in faults.
impurities.
Operation
? Do not modify the Actuator and change the operating position.
Incorrect
Correct
Separate the
installation
location from
heat so u rces.
? Make sure that the switching speed is not extremely slow or do not
use the Switch so that the pushbutton will be set to a position
between the FP and OP.
? Make sure that the pin plunger and the switching stroke are on the
same vertical line.
? Make sure that the switching frequency or speed is within the
? Mount a cover if the switch is to be installed in a location where
worker inattention could result in incorrect operation or accidents.
specified range.
1. If the switching speed is extremely slow, the contact may not be
switched smoothly, which may result in a contact failure or contact
welding.
Incorrect
Correct
2. If the switching speed is extremely fast, switching shock may
damage the Switch soon. If the switching frequency is too high,
the contact may not catch up with the speed.
The rated permissible switching speed and frequency indicate the
switching reliability of the Switch.
The life of a Switch is determined at the specified switching
speed. The life varies with the switching speed and frequency
even when they are within the permissible ranges. In order to
determine the life of a Switch model to be applied to a particular
use, it is best to conduct an appropriate durability test on some
samples of the model under actual conditions.
? Make sure that the actuator travel does not exceed the permissible
OT position. The operating stroke must be set to 70% to 100% of
the rated OT.
Precautions for Correct Use
Mounting Location
? Do not use the switch alone in atmospheres such as flammable or
explosive gases. Arcing and heat generation associated with
switching may cause fires or explosions.
? Switches are generally not constructed with resistance against
water. Use a protective cover to prevent direct spraying if the switch
is used in locations subject to splashing or spurting oil or water,
dust adhering.
(pre v en ting malfunctions)
? Subjecting the switch to continuous vibration or shock may result in
contact failure or faulty operation due to abrasion powder and in
reduced durability. Excessive vibration or shock will cause the
contacts to operate malfunction or become damaged. Mount the
switch in a location that is not subject to vibration or shock and in a
direction that does not subject the switch to resonance.
? If silver contacts are used with relatively low frequency for a long
time or are used with microloads, the sulfide coating produced on
the contact surface will not be broken down and contact faults will
result. Use a microload switch that uses gold contacts.
? Do not use the switch in atmospheres with high humidity or heat or
in harmful gases, such as sulfide gas (H 2 S, SO 2 ), ammonia gas
( N H 3 ), nitric acid gas (H N O 3 ), or chlorine gas (Cl 2 ). Doing so may
impair functionality, such as with damage due to contacting faults or
corrosion.
? The switch includes contacts. If the switch is used in an atmosphere
with silicon gas, arc energy may cause silicon oxide (SiO 2 ) to
accumulate on the contacts and result in contact failure. If there is
silicon oil, silicon filling, silicon wiring, or other silicon products in
the vicinity of the switch, use a contact protection circuit to limit
arcing and remove the source of the silicon gas.
Incorrect
Terminal b ox
Terminal b ox
Correct
? Install the switch in a location that is not directly subject to debris
and dust from cutting. The actuator and the switch body must be
protected from accumulated cutting debris and dirt.
Incorrect
Correct
120
High-temperature Basic Switch
TZ
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