7
Chapter 3. MOUNTING AND WIRING
●
MCF _ _ _ _ _ G pipe installation cautions
• The
MCF
is a precision instrument. Do not drop it nor subject it to shock.
• Install so that the direction of gas flow matches the arrow on the side of the
MCF
.
• Do not apply force to the measurement module during installation.
• Do not allow foreign matter to enter the
MCF
. If rust, water droplets, oil mist or
dust from the pipe enters the device, measurement error, control error, or dam-
age may occur. Before installation, be sure to flush upstream and downstream
piping thoroughly to remove foreign matter.
• Be sure to use the gasket between the pipe and the
MCF
.
• When connecting a piping element such as a pipe with a different diameter, a
regulator, a filter, or a valve on the upstream side, use the recommended straight
pipe section. Failure to do so could cause a measuring error.
“Accuracy and straight pipe length” (page 10)
• If a reducer or tube fitting is connected without a straight pipe section, the dis-
play might indicate a negative flow rate even though air is flowing in the posi-
tive direction.
“Straight pipe section” refers to a straight pipe with the same diameter as the
MCF
port. The following types of pipe are suitable: Carbon Steel Pipes for
Ordinary Piping (JIS G3452), ANSI schedule 40 or less; Carbon Steel Pipes for
Pressure Service (JIS G3454), or ANSI schedule 40 or less; Stainless Steel Pipes
(JIS G3459).
• Although there are no restrictions of mounting direction, if the
MCF
is mounted
on a horizontal pipe and the display faces to the side, a measuring error can be
caused by the mounting direction.
“Mounting direction” (page 8)
Also, if the unit is mounted on a horizontal pipe with the display facing down-
ward, foreign matter (rust, water droplets, oil mist, dust) in the pipes might accu-
mulate in the sensor, causing measuring error or damage.
• Do not install this device near the outlet of a compressor or bellows pipe, or in a
location where the regulator or the check valve causes hunting. Doing so could
cause measurement error.
