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4. When fixing the switch with screws using
mounting holes, use a tightening torque of
0.3 N·m or less. If necessary, tighten the pro
-
duct to prevent it from loosening.
Operating Environment
1. Never use in the presence of explosive gases.
The switch does not have an explosion 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. Mount the switch in a location where there is
no vibration greater than 98 m/
s
2
, or no im-
pact greater than 490 m/s
2
.
With a switch with orifice, the adjusted flow rate value could be
affected by vibration.
3. Do not use in an area where surges are generated.
When there are units that generate a large amount of surge in
the area around a pressure switch, (e.g., solenoid type lifters,
high frequency induction furnaces, motors, etc.) this may cause
deterioration or damage to the switch’s internal circuitry. Avoid
sources of surge generation and crossed lines.
4. Switches are not equipped with surge protec-
tion against lightning.
The flow switches are CE compliant; however, they are not
equipped with surge protection against lightning. Lightning sur
-
ge protection measures should be applied directly to system
components as necessary.
5. Avoid using the switch in an environment
where the likelihood of splashing or spraying
of liquids exists.
The switch is an open type and should not be used in an envi-
ronment exposed to splashing of water and oil.
6. Do not use the product in an environment
subject to a temperature cycle.
If the product is subject to a temperature cycle other than natu-
ral changes in air temperature, the internal components of the
switch could be adversely affected.
7. Do not mount the product in locations where
it is exposed to radiant heat.
This could result in damage and/or malfunction.
Warning
1. Verify the color and the terminal number
when wiring.
Incorrect wiring can cause the switch to be damaged and
malfunction. Verify the colour and the terminal number in the
instruction manual when wiring.
2. Use caution not to repeatedly apply bending
or stretching forces to the lead wire.
Repeated pulling or bending of the lead wire may cause some
of the wires to break.
Wiring
Warning
3. Confirm proper insulation of wiring.
Make sure that there is no faulty wiring insulation (contact with
other circuits, ground fault, improper insulation between terminals,
etc.). Damage may occur due to excess current flow into a switch.
4. Do not wire in conjunction with power lines or
high voltage lines.
Wire separately from power lines and high voltage lines, and avoid
wiring in the same conduit with these lines. Control circuits,
including switches, may malfunction due to noise from these lines
.
5. Do not short-circuit a load.
Although the switch displays an overcurrent error if a load is short-
circuited, there is not protection against incorrect wiring (power
source polarity, etc.). Use caution to avoid wiring incorrectly
.
6. Do not connect wiring while energising the
product.
The switch and any equipment connected to it could break and
malfunction.
Wiring
Warning
Mounting
1. Observe the proper tightening torque.
When the switch is tightened beyond the specified tightening
torque, the switch may be damaged.
2. Do not mount the switch in a place that will be
used as a scaffold.
The switch could break if subjected to excessive load such as
being accidentally stepped on.
3. Use a tapping screw (P-tite) with nominal
diameter of 3 to mount the product by using
the bracket mounting hole(s) at the bottom
.
The length of the screw depends on the thickness of the plate to
be fixed. Please select a screw whose length is the thickness of
the plate + 4.8 mm. (The hole depth is 5 mm.)
Caution
Series PFM
Specific Product Precautions 2
Be sure to read this before handling.
Refer to the back of page 1 for Safety Instructions and “Precautions for Handling
Pneumatic Devices” (M-03-E3A) for Common Precautions.
Design and Selection
Mounting
Warning
1. Monitor the flow direction of the fluid.
Install and connect piping so that the fluid flows in the direction
of the arrow indicated on the body.
2. Remove dirt and dust from the inside of the piping
by means of air blow, before attaching to the
switch.
3. Do not drop or bump.
Do not drop, bump, or apply excessive impacts (490 m/s
2
) while
handling. Although the external body of the switch (switch case)
may not be damaged, the inside of the switch could be dama
-
ged and cause a malfunction.
4. Hold the body of the switch when handling.
The tensile strength of the cord is 49 N and applying a greater
pulling force than this can cause a malfunction. When handling,
hold the body of the switch.
5. Do not use until you can verify that equipment
can operate properly.
Following mounting, repair, or retrofit, verify correct mounting by
conducting suitable function and leakage tests after piping and
power connections have been made.
6. Never mount the switch in a place that will be
used as a scaffold during piping.
7. Apply a wrench only to the metal part of the
piping when installing the flow switch in the
piping system
.
There is a risk of breakage of the switch.
1. Operate the switch only within the specified
voltage.
Use of the switch outside of the specified voltage range can
cause not only a malfunction and damage to the switch, but it
can also cause electrocution and fire.
2. Do not exceed the maximum allowable load
specification.
A load exceeding the maximum load specification can cause
damage to the switch.
3. Do not use a load that generates surge volta-
ge.
Although surge protectiion is installed in the circuit at the output
side of the switch, damage may still occur if a surge is applied
repeatedly. When working directly such an unit as relay, sole
-
noid valve, etc., which generates surge, use a built-in surge ab
-
sorbing element type.
4. Be sure to verify the applicable fluid.
The switches do not have an explosion proof rating. To prevent
possible fire hazard, do not use with flammable gases or fluids.
5. Monitor the internal voltage drop of a switch.
When operating below the specified voltage, it is possible that a
load may be ineffective, even though the pressure switch func-
tion is normal. Therefore, the formula below should be satisfied
after confirming the voltage of the load.
6. Use the switch within the specified flow rate
measurement and operating pressure.
Operating beyond the specified flow rate and operating pressu-
re can damage the switch.
7. Never use flammable fluids and/or permeable
fluids.
They may cause a fire, an explosion or corrosion.
∗ Refer to the MSDS (Material Safety Data Sheet) when using
chemicals.
8. To prevent damage due to failure and/or mal-
function of the product, establish a backup
system such as a fail-safe system which ena
-
bles multiple-stage type operation of the
equipment and machinery.
9. When the product is for an interlock circuit,
the following points should be noted.
• Provide double interlocking through another system (mecha-
nical protection function, etc.).
• Perform checks to ensure the product is operating properly,
as there is a risk of injury.
Warning Caution
1. Ensure sufficient space for maintenance acti-
vities.
Provide space required for maintenance.
2. The direct-current power supply to combine
should be UL authorized power supply.
3. Data of the switch are stored even after the
power supply is turned off.
Input data is stored in an EEPROM so that the data will not be
lost after the flow switch is turned off. (The data can be rewritten
for up to one million times, and stored for up to 20 years.)
No load voltage (V peak)
0 to 20 [V]
Above 20 to 30 [V]
Max. current rating
5.0
100
Peak voltage
(1) Limited voltage current circuit in accordance with UL 508.
A circuit in which power is supplied by the secondary coil of a
transformer that meets the following conditions.
• Maximum voltage (with no load):
30 Vrms (42.4 V peak) or less
• Maximum current:
(1) 8 A or less (including when short circuited)
(2) limited by circuit protector (such as fuse) with the follow-
ing ratings.
(2) A circuit using max. 30 Vrms or less (42.4 V peak), which is
powered by UL 1310 or UL 1585 compatible Class-2 power
supply.
Series
PFM
Specific Product Precautions 1
Be sure to read this before handling.
Refer to the back of page 1 for Safety Instructions and “Precautions for Handling
Pneumatic Devices” (M-03-E3A) for Common Precautions.
Supply
voltage
–
>
Internal voltage
drop of switch
Minimum operating
voltage of load
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