B-144-12-E
15
9. OPERATING INSTRUCTIONS
9.1 Operation (See page 18 for the jacketed type.)
At first-time operation, carefully operate in the following sequence, allowing the flow within the flow range
specified. (Refer to the piping diagram below.)
(1) Shut off the valve (A) on the inlet side and the valve (B) on the outlet side and then open the bypass
line valve (C) to allow the fluid in the bypass line, thereby removing weld chips, scales and other
foreign matter left in the piping assembly.
CAUTION: This is particularly important on new installations.
(2) Carefully and slightly at first, open the valve (A) upstream of the meter progressively and then, slightly
at first, open the valve (B) downstream progressively.
(3) Slowly close bypass line valve (C) and make sure that the total counter in the register advances in
response. Maintain a flowrate 10 to 20 % of the maximum flowrate (confirm it in the instantaneous
flowrate display mode) at this time, allow the flow for more than 15 minutes and make sure that air in
the piping assembly has totally escaped.
In applications where temperature exceeds 60
°
C, run the system at least for 30 minutes in this state
to ensure uniform heat distribution in the measuring chamber.
(4) Following the break-in operation (preheating), shut off the bypass line valve (C) completely and open
the upstream valve (A) progressively until fully open and slowly open downstream valve (B) until the
rated flow is obtained.
(5) Flowrate should be regulated with the valve (B) downstream of the meter and should be held within
the specified rate.
(6) The strainer net should be inspected for condition and cleaned on a regular basis. On a new
installation, in particular, inspect daily first and, according to the clogged condition of the net being
observed, inspection intervals may be reduced progressively to, say, once a week.
Flow Direction
Valve
Meter
Strainer
Bypass Line
B
A
C
