19
Chapter 4. FUNCTIONS
■ Integration options for backflow
If there is a reverse flow, the operation of the MCF depends upon the integration
option settings, as indicated below.
Note: In each case, the integrated reverse flow rate can be checked on the informa-
tion display.
C12 setting Operation
00: Normal and The MCF integrates normal flow and reverse flow separately.
reverse flows are
integrated
separately
01: Reverse flow When a reverse flow occurs, the MCF resumes integration of the normal flow
is subtracted from only after the reverse flow integrated value reaches 0.
the integrated
count
0
0
Instantaneous flow rate
Normal flow counter
Reverse flow counter
When there is a reverse flow, the MCF stops the normal flow counter and starts
the reverse flow counter. When normal flow resumes, the MCF subtracts
the normal flow from the reverse flow counter until the counter reaches 0.
Thereafter the normal flow is added to the normal flow counter.
Reverse flow integration
Normal flow integration
Normal flow
Normal flow
Reverse flow
Normal flow count
resumes because
reverse flow counter
has reached 0
Normal flow counter
is paused
Hold continues
because a reverse
flow total remains
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