Dynasonics TFXP Series Transit Time Ultrasonic Flow Meter - Manual (Page 85)

Rev. 5/09
-4.7- TFXP
Substitute Flow is used to provide an indication and output that
signifies that an error exists with the flow meter or its setup. It is set
as a percentage between MIN Flow and MAX Flow. In a
unidirectional system this value is typically set to zero to indicate
zero flow while in an error condition. In a bi-directional system, the
percentage can be set such that zero is displayed in an error
condition. To calculate where to set the Substitute Flow value in a
bi-directional system, perform the following operation:
Entry of data in the Basic and Flow tabs is all that is required to
provide flow measurement functions to the flow meter. If the user is
not going to utilize input/output functions, click the Download button
to transfer the configuration to the TFX instrument.
Advanced Tab
The Advanced tab contains several filter settings for the TFX flow
meter. These filters can be adjusted to match response times and
data “smoothing” performance to a particular application. The
factory settings are suitable for most installations.
Downloading
the
Configuration
Meter Filter
Configuration
)
Substitute Flow = 100
−
100 × MAX Flow
MAX Flow
− MIN Flow
(
Figure 4.4 — Flow Tab Layout
PART 4 - SOFTWARE UTILITIES