Siemens SITRANS F - Zeromatic; Using Actual Zero; Using Reversamatic

2-28
1010ENFM-3B
Section 2
ZeroMatic (not present in MultiPulse operation)
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 dy-
namically compensates for changing conditions which would normally result in zero drift. ZeroMatic will
only operate with the transducers 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 interrupt-
ing ZeroMatic operation. To disable ZeroMatic, invoke it again, but then press <Left Ar-
row> 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:
Access the [Zero Flow Adjust] option list by pressing
Press . 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.
Press to start the Actual Zero process.
When you send the command, the flow computer 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 <ENT> key. This controls the amount
of data the meter averages to obtain a zero level.
Using ReversaMatic
If site conditions do not permit stopping the flow rate at the mounting location, and Reflect Mount is not
possible, then use the ReversaMatic routine to establish the zero flow level.
To invoke ReversaMatic:
z To access the [Zero Flow Adjust] option list press
z Move the cursor to [ReversaMatic]. Press to invoke the routine.
ENT
ENT
ENT