Datasheet

17
1. Never use in the presence of explosive gases.
The switch does not have an explosiion proof construction.
If it is used in an environment where explosive gases are
used, it may cause an explosive disaster. Therefore, never
use it in such an environment.
2. Observe the specified fluid and ambient tempera-
ture range.
The operating fluid temperature range is 0 to 85°C, and
ambient temperature range is 0 to 50°C. Take measures to
prevent moisture from freezing in a piping circuit when using at
5°C or less, since this may cause damage to the product and
lead to malfunction. Even when the ambient temperature
range is within the specifications, do not use in locations
where there are rapid temperature changes.
3. If the temperature of the fluid is lower than the ambi-
ent temperature, condensation will be generated
which may damage the product or cause malfunction.
Operating Environment
Warning
1. Product temperature becomes high when hot fluid
is used. Use caution, as there is a danger of being
burned if a valve is touched directly.
2. Enclosure is for this product with lead wire with
M12 connector. Be careful when handling the prod-
uct without connector.
Operating Precautions
Warning
1. Take precautions when using the switch for an inter-
lock circuit.
When a pressure switch is used for the interlock circuit, devise
a multiple interlock system to prevent trouble or malfunction,
and verify the operation of the switch and interlock function on
a regular basis.
Maintenance
Warning
1. Check regulators and flow adjustment valves before
introducing the fluid.
If pressure or flow rate beyond the specified range are applied
to the switch, the sensor unit may be damaged.
Fluid
Warning
1. Operate fluids with electric conductivity of 5 μS/cm
or more.
Note that this product cannot be used for fluids with low conduc-
tivity. This product cannot be used for fluids that do not conduct
electricity such as deionised water (pure water) and oil.
The electric conductivity is a ratio which shows how easily the
electricity flows.
2. If insulating material gets stuck inside of the piping,
it may cause an error.
Remove the foreign material stuck inside of the piping with a
brush for washing test tubes so that internal rubber piping will
not be damaged.
3. If conductive material such as metal gets stuck to the
whole surface in the piping, the switch may malfunction.
Remove the foreign material as mentioned above.
4. If the fluid with stray current running inside is mea-
sured, the switch may malfunction.
Beware that earth leakage from the equipment around the
switch such as pump and stray current caused by ground fault
should not flow into the fluid to be measured.
Caution
Substance description Judgement Note
Water
Deionised water (pure water)
Water-soluble coolant
Oil
Oil-based coolant
Sea water
GALDEN
®
Fluorinert™
앪
҂
앪
҂
҂
҂
҂
҂
Electric conductivity of tap water: 100 to 200 μS/cm
Electric conductivity is too low.
When the ratio of water is 50% or more.
Electric conductivity is too low.
Electric conductivity is too low.
Corrosive to the product.
Electric conductivity is too low.
Electric conductivity is too low.
∗
Use the applicable fluids list as a guide. 앪: Acceptable ҂: Not acceptable
Applicable Fluids List
GALDEN
®
is a registered trademark of Solvay Solexis, and Fluorinert™ is a registered trademark of 3M.
Mounting
Refer to the tightening torque in the
right table for connecting steel piping.
Torque lower than the value in the table
leads to fluid leakage.
For mounting the fittings on the market,
refer to the torque specified for each.
3/8
1/2
3/4
1
24 mm
28 mm
35 mm
41 mm
Width across flats
of attachment
Nominal thread size
Rc (NPT) 3/8
Rc (NPT) 1/2
Rc (NPT) 3/4
Rc (NPT) 1
Proper tightening torque (N·m)
22 to 24
28 to 30
28 to 30
36 to 38
Caution
1. When connecting the piping to the switch, do not
rotate the switch. Apply a wrench to the metal part
of the piping port to turn the fitting.
Using a wrench on other parts may damage the product.
Specifically, make sure that the wrench does not damage the
M12 connector. This will damage the connector.
Be sure to read before handling. Refer to back cover for Safety Instructions, “Handling
Precautions for SMC Products” (M-E03-3) and Operation Manual for Flow Switch
Precautions. Please download it via our website, http://www.smcworld.com
Series LFE
Specific Product Precautions 2