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Functions
7.3 Zero Flow Adjust Menu
FUS1010 IP65 NEMA 4X & IP66 NEMA 7
110
Operating Instructions, 01/2013, A5E02951520-AC
ZeroMatic
When ZeroMatic is invoked the flow meter first performs the same analysis as described
above in the AutoZero routine. However, after this analysis is complete the flow meter
continues to interrogate the pipe wall signal and update the zero offset value under normal
operation, such that the flow meter dynamically compensates for changing conditions which
would normally result in zero drift. ZeroMatic will only operate with the sensors mounted in
the Reflect Mode configuration and is recommended for applications which experience large
temperature extremes.
Note
Invoking ZeroMatic will clear any existing "fixed" or memorized zero offset. If any zero offset
remains after flow is stopped, an Actual Zero can be performed without interrupting
ZeroMatic operation. To disable ZeroMatic, invoke it again, but then press <Left Arrow> to
abort the installation.
Note
The ZeroClr command only resets the memorized zero offset registers not those set when
the AutoZero routine is invoked.
Using Actual Zero
Note
Flow must be stopped with the line blocked (if possible) before invoking this function.
To invoke Actual Zero:
1.
Access the [Zero Flow Adjust] option list by pressing <Right Arrow>.
2.
Press <ENTER>. A pop-up window prompts you to set the current flow rate (in selected
rate units) to equal zero (0.000).
Note
If a flow offset is desired (i.e., to test analog outputs) then press <Right Arrow> to enable
numeric entry.
3.
Press <ENTER> to start the Actual Zero process.
When you send the command, the flow meter analyzes the current flow rate for up to sixty
seconds, integrating (averaging) the data for the best zero correlation. During this time, the
menu prompt at the top of the display screen shows a timer that counts from zero to sixty.
You can allow zero averaging for the entire period, or cancel the process at any time by
pressing the <ENTER> key. This controls the amount of data the flow meter averages to
obtain a zero level.
Содержание FUS1010
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