Ultraflux UF 801-P, Руководство пользователя

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How to estimate actual Co for a product that is not in
the attached list (see also § 21).
Since firmware version 4, UF 801-P has benefit of a more
completed product list included in its menu.
If your product is not in the list, you can proceed as follows:
- Enter an approximate Co and a large Delta C range,
expecting just an echo in the capture window.
- Read the returned Speed of Sound (Measurement menu),
enter it instead of previous value, read and adjust the new
distance between probes and check again.
- If new Speed of Sound display is very close to this entered
Co, you have now a reliable estimation of this characteristic in
your product.
7.3 Zero / Auto Zero Settings:
Simple mode does not permit zeroing the flow, only normal or advanced are
offering. This possible zero offset has more or less weight, but can be very
important for accuracy when there is a low delta T at flow range: small pipe ...
This offset is almost due to the pipe itself, to the probes choice, even matched,
and their installation.
To prevent from errors at flow range lower part, we duly recommend to perform a
null flow control and to compensate it if too different from expected.
Attention ! Ensure yourself that the flow is perfectly null and will stay as so during
time when you will perform the zero setting: valves must be and stay closed,
pumps stopped and turbulences or oscillations down to zero.
Two methods:
 Manual method : read this Delta To , and enter it in probes menu at Delta
To line (see previous page).
 Automatic method with Auto-Zéro : In the Fluid settings menu, at screen
bottom (see next page), Auto Zero line, change No to Yes anr set
averaging time from 30 Sec. to 5 Mn for less or more accuracy.
 After have returned to measurement mode (long press on F ), UF 801-P
must be able to measure (otherwise, nothing will happen).
If everything is OK, UF 801-P displays “Zero” at screen bottom .