Toshiba LF600F - Manual (Page 131)

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10.6 Remote Zero Adjustment
On-stream zero adjustment in a zero flow rate condition can be started with an external signal.
To do this, set DI as a zero adjustment start signal. See 8.2.20, “Digital I/O”
[Signal Input Timing]
Zero adjustment
start signal
H level
L level
* The start signal must be set to H level first, then it must go to L level after the passage of
more than 10 seconds but not more than 20 seconds, as shown above.
If the signal does not go to L level within this specified period, it will be ignored.
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