8
• Do not install at a location receiving the influence of pulsating flow.
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 compressor type, there is a possibility of causing faulty operation.
As shown in the above figure, provide the devices eliminating the for-
eign 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-
damping 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.
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.
Countermeasure 2.
Design the system so that other devices do not receive the
output (4 to 20mA pulse) from the MVF on the unused line.
Line A
Valve
Valve
Line B
MVF
MVF
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.
Filter
Dryer Receiver
tank
MVF
Compressor
Compressor
(screw type, etc.)
MVF
Chapter 3. INSTALLATION, MOUNTING, WIRING
