Handling precautions
•
Do not install this device at the location near the exit of compressor. At the
location near the exit of compressor the strong pulsating flow is caused
and there might be a dispersing of iron powder depending on the com-
pressor type, there is a possibility of causing faulty operation.
Filter
Dryer Receiver
tank
MVF
Compressor
Compressor
(screw type, etc.)
MVF
As shown in the above figure, provide the devices eliminating the foreign
matters such as oil, water and iron powder, and install a receiver tank as
the measures against pulsating flow ; at the upstream of MVF series.
•
Take effective countermeasures in case of installation near a pump or
roots blower. If this device is installed near a pump or roots blower, it may
be affected by a pulsating flow. Install a volume tank or pulsation-damp-
ing device (muffler) between the pump or roots blower and this device to
suppress the influence of pulsation as much as possible.
•
If the device is installed downstream of branched piping, it may detect
reverse flow rate. Be sure to take countermeasures as illustrated below.
Example: In this application, Line A is operating but B is stopped. Although
the flow rate of B is essentially zero as detected by the MVF in B,
the MVF might count and integrate a false flow rate caused by
the influence of the flow in Line A.
Line A operating
Flow path
Line B stopped
MVF
MVF
Due to the influence of flow in Line A,
a false flow is detected in B.
Countermeasure 1
Install a valve on the upstream side of the MVFs if there is an
unused line, to eliminate the influence of flow in the other line.
Line A
Valve
Valve
Line B
MVF
MVF
Countermeasure 2
Design the system so that other devices do not receive the out-
put (4 to 20 mA or pulse) from the MVF on the unused line.
9
Chapter 3. INSTALLATION, MOUNTING, WIRING
