Tokyo Keiki UFL-30, Installation & Operation Manual

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III-10
Function Low flow cut Cuts (zeros) flows when flow falls below prescribed instantaneous
flow rate. Used in order to avoid output of flow values other than 0
when measurement value during still flow becomes disordered.
No Echo
receiving
warning
If measurement cannot be made when no echo is received
continuously over the setting time
(determined transition time)
, status is
changed to
-
Selected analog output type
Selectable analog output transition status as follows.
0% (4mA), hold, 100% (20mA), burnout (20.8mA)
-
Display "R" on LCD.
-
Contact output of warning if set.
Note:
1) Measurement values and analog output will be restored when echo is
received continuously over the setting time (determined restore time).
2) In case of multi-paths, processing can be selected to change output for no
echo receiving for 1 path or for all paths.
Initial setting value is for no echo receiving for all paths.
3) If measurement can be made for even 1 path, measurement will be
continued for only this path.
Disturbance
detection
Check whether processing values are measured properly or not
and if determined to be disturbed conditions then measuring
values are eliminated.
- Display ”D” on the display
- Count up as history on status 2
Zero Shift
compensation
Zero point can be independently compensated (shifted) for
forward and backward flow rate.
Span
compensation
Slope of span line can be independently compensated for forward
and backward flow rate in the range 0.100 to 2.000.
Filtering
(Smoothing)
Rapid flow rate changes would be smoother by this filter for 1
to120 sec. (Default 15sec)
Note: This value is meaning the time until measuring flow rate reaches 90%
by step-up increment.
Self-diagnostics
and failure
processing
Self-diagnostics is run periodically.
If failure is diagnosed on following items, transitions to be selected
status.
Diagnostic checks:
1) Memory Area check (for totalizing and setting parameter)
2) Parameter check
3) Time measurement counter malfunction
4) Transmitter malfunction
5) Receiver malfunction
- Selected analog output transition status as follows.
0% (4mA), hold, 100% (20mA), burnout (20.8mA)
- Display "ERR**" on LCD. (** is error number.)
-
Contact output of warning if set.
Note: "AND" , "OR" condition is selectable in accordance with fault tolerance
function setting.