ReversaMatic
This routine involves swapping the Up and Down transducers on the pipe (while keeping the
cables attached) such
that the difference in the transit-time change represents the zero offset.
The fixed zero offset value is stored in memory in the same manner as described in Actual
Zero. This routine would generally be used whenever flow cannot be stopped and the
transducers cannot be mounted in the Reflect Mode configuration. Flow must be stable during
the entire process.
ZeroMatic
When ZeroMatic is invoked the flowmeter first performs the same analysis as described above
in the AutoZero routine. However, after this analysis is complete the flowmeter continues to
interrogate the pipe wall signal and update the zero offset value under normal operation, such
that the flowmeter 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 <ENT>. 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 <ENT> to start the Actual Zero process.
Connecting
5.3 Zero Flow Adjust Menu
FUP1010 IP67 Portable Flowmeter
Operating Instructions, 02/2010, A5E02951522A Revision 01
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