Design and Selection
Mounting
Thread
1/8
1/4
3/8
1/2
3/4
1
Proper tightening torque (N·m)
7 to 9
12 to 14
22 to 24
28 to 30
28 to 30
36 to 38
Flow Switches
Precautions 1
Be sure to read before handling.
1. Make sure to use a switch by the specified voltage.
Use of a switch outside the range of the specified voltage can
cause not only malfunction and damage of the switch, but
also electrocution and fire.
2. Never use such a load, which exceeds the
maximum allowable load.
It may result in a damage to a switch.
3. Since the type of fluid varies depending on the
product, make sure to verify the specifications.
Never use flammable gases or fluids, since the switch is not
explosion proof construction. It may result in a fire.
[For air]
4. Make sure to use a switch within the specified flow
rate for measurement and the maximum operating
pressure.
Operating beyond the specified flow rate and operating pressure
can damage the switch.
If using a switch by exceeding the maximum operating pressure,
switch is damaged.
[For water]
5. Make sure to use a switch within the specified flow
rate for measurement and the maximum operating
pressure.
Operating beyond the specified flow rate and operating
pressure can damage the switch.
Damage to the switch may occur if the switch is subject to
higher pressure than its designed limit.
Avoid especially the application of pressure above
specifications through a water hammer.
<Countermeasure examples>
a) Use a device such as a water hammer relief valve to slow
the valve's closing speed.
b) Absorb an impact pressure by using a rubber material
piping such as a rubber hose and an accumulator.
c) Keep the piping length as short as possible.
1. Mount a switch by observing the proper tightening
torque.
When a switch is tightened beyond the specified tightening
torque, a switch may be damaged. On the other hand,
tightening below the specified tightening torque may cause
the installation screws to come loose during operation.
2. Apply a wrench only to the metal part of the piping
when installing the flow switch in the system
piping.
Do not apply a wrench to the plastic part of the main housing
of the switch.
3. Monitor the flow direction of the fluid.
Install a switch in the direction as indicated on the body.
4. Remove solid foreign objects, etc. inside piping by
air blow before connecting a switch with piping.
5. 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 damaged and cause a malfunction.
6. Hold the body of a switch when handling.
The tensile strength of the cord is 49 N. Applying a greater
pulling force on it can cause a malfunction. When handling,
hold the body of the switch—do not dangle it from the cord.
7. Do not use until you can verify that equipment can
operate properly.
Verify whether it is mounted correctly by running fluids or
applying the electricity in order to conduct suitable function
and leakage tests when mounting for the first time or after
system repair or modification was made.
[For air]
8. Ever mount a switch in a place that will be used as
a scaffold during piping.
If an excessive weight is applied on a switch, switch may be
damaged.
9. Be sure to allow straight pipe length that is
minimum 8 times the port size upstream and
downstream of the switch piping.
Do not suddenly narrow the pipe size because doing so will
disturb the flow speed distribution in the pipe, making it
impossible to obtain the correct measurements.
[For water]
10. Never install a switch in such a place, where switch
is used as a foothold in the 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 15 N·m or more to the metal parts of the
switch.
Warning
Warning
16-11-2
