Rev. 01/11 -3.5- TFXL-X
The Damping value is increased to increase stability of the flow
rate readings. Damping values are decreased to allow the flow
meter to react faster to changing flow rates.
Low Flow Cutoff is entered as a percentage of MAX Flow and
influences how the flow meter will act at flows very near zero.
Generally, an entry of 1% provides for a stable zero indication,
while providing a 100:1 turndown ratio for measurements.
Low Signal Cutoff is a relative value that should be entered
after a successful flow meter startup. For an initial value, enter
5% (Signal Strength indications below 2% are considered to be
below the noise ceiling and should not be indicative of a
successful flow meter startup). The entry has three purposes: It
provides an error indication—Low Signal Strength (Error 0010 on
the TFXL display)—when liquid conditions within the pipe have
changed to the point where flow measurements may not be
possible. It warns if the pipe’s liquid level has fallen below the
level of the transducers. It can also signal that something with
the flow meter installation or configuration may have changed.
Examples would include such things as the couplant used to
mount the transducer has become compromised, a cable has
become disconnected or a pipe size setting has been altered.
PART 3 - PROGRAMMING
Exponent Display Multiplier
E-1 1 (No multiplier)
E0 1 (No multiplier)
E1 10
E2 100
E3 1,000
E4 10,000
E5 100,000
E6 1,000,000
Table 3.1
Totalizer Exponent Values
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