Datasheet

39
Specific Product Precautions 2
Be sure to read before handling. Refer to page 37 for safety instructions.
Series PF2A/PF2W
1. Verify the color and the terminal number when wiring.
Incorrect wiring can cause the switch to be damaged and
malfunction. Verify the color and the terminal number in the
instruction manual when wiring.
2. Avoid repeatedly bending or stretching of the lead wire.
Repeatedly applying bending stress or stretching force to the
lead wire will cause it to break.
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
avoiding wiring in the same conduit with these lines. Control
circuits including switches may malfunction due to noise from
these lines.
5. Do not allow a load to short circuit.
Although a switch indicates excess current error if a load is
short circuited, all incorrect wiring connections such as power
supply polarity cannot be protected. Take precautions to
avoid incorrect wiring.
1. Never use in the presence of explosive gases.
The switches do not have an explosion proof rating. Never use
in the presence of an explosive gas as this may cause a
serious explosion.
2. Mount the switch in a locations where there
is no vibration greater than 98 m/s
2
or impact
greater than 490 m/s
2
.
3. Do not use in an area where surges are gen-
erated.
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
surge protection measures should be applied directly to the
system components as necessary.
5. Avoid using the switch in an environment
where the likelihood of splashing or spraying
of liquids exists.
The switches are dustproof and splashproof, however avoid
using in an environment where the likelihood of heavy
splashing or spraying of liquids exists. Since the display unit of
the remote type switches featured here is not dust or
splashproof, the use in an environment where liquid splashing
or spraying exists must be avoided.
[For air]
6. Use the switch within the specified fluid and
ambient temperature range.
The fluid and ambient temperature range is 0° to 50°C. Take
measures to prevent the fluid from freezing when it is below
5°C, since this may damage the switch and lead to a
malfunction. The installation of an air dryer is recommended for
eliminating condensation and moisture. Never use the switch in
an environment where there are drastic temperature changes
even when these temperatures are within the specification.
[For water]
7. Use the switch within the specified fluid and
ambient temperature range.
The fluid and ambient temperatures range for the switch is 0 to
50°C (and 0 to 90°C for high temperature fluid). Take
measures to prevent the fluid from freezing when it is below
5°C, since this may cause damage to the switch and lead to a
malfunction. Never use the switch in an environment where
there are drastic temperature changes even when these
temperatures fall within the specified temperature range.
Operating Environment
Wiring
1. When using a switch for high temperature
fluid, the switch itself also becomes hot due
to the high temperature fluid. Avoid touching
the switch directly as this may cause a burn.
Warning
Warning
Usage
Warning
[For air]
9. Never mount a switch in a place that will be
used as a step stool during piping.
Damage may occur if an excessive load is applied to the switch.
10. Be sure to allow straight pipe length that is
minimum 8 times the port size upstream
and downstream of the switch piping.
When abruptly reducing the size of piping or when there is a
restriction such as a valve on the upstream side, the pressure
distribution in the piping changes and makes accurate
measurement impossible. Therefore, flow restriction
measures such as these should be implemented on the
downstream side of the switch.
[For water]
11. Never mount a switch in a place that will be
used as a step stool during piping.
Damage may occur if an excessive load is applied to the
switch. Especially when the switch supports the piping, do not
apply a load of 15N⋅m or more to the metal part of the switch.
12. Be sure to allow straight pipe length that is
minimum 8 times the port size upstream
and downstream of the switch piping.
When abruptly reducing the size of piping or when there is a
restriction such as a valve on the upstream side, the pressure
distribution in the piping changes and makes accurate
measurement impossible. Therefore, flow restriction
measures such as these should be implemented on the
downstream side of the switch.
When used with the downstream side open, be careful of
the cavitation that is prone to occur.
Warning
Mounting