AFLOWT UF-5 Series, Operation Manual

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2.3. Determining the Additional Lag (Padd)
2.3.1. The Padd setting value is determined as follows. Open Settings menu
and select Calibration / Add. delay calibr. / Padd CALIBR. chan. X
line and enter tabular value of sound velocity Cref . After that, you need
to activate Automated option and start calibration procedure (set Start
value for Run calibr. parameter). After calibration procedure is stopped
(to do this specify Stop. value for Run calibr setting) and you return to
Padd CALIBR. chan. X window, Padd setting will be automatically set
to the value calculated by the flowmeter.
The calculated value of Padd setting is logged into the check form
which is given in the Installation Manual.
NOTE. When measuring flowrate in water and heat supply sys-
tems, the ultrasound velocity is determined in accordance with Appen-
dix D of the Installation Manual. When measuring flowrate of other liq-
uids the ultrasound velocity is determined according to GSSD tables for
measured liquids or using special device (see Fig.D.1 in Appendix D of
the Installation Manual). The ultrasound velocity shall be entered into
the flowmeter 5 minutes after determining at the latest.
2.4. Settings for Processing of Measurement Results
2.4.1. Open Settings / Processing settings menu and enter setting value:
- Median
– median averaging buffer size
- Mean
– arithmetic averaging buffer size
- KP
– exponential filter factor (0.95 by default)
- Inert. time
– lag (it is not advisable to set it to less than 10 s)
- Accel.
– maximum speed of flow velocity variation
- Cut.
–
minimal flowrate cutoff
- LW
– low setpoint for flowrate
- UP
– high setpoint for flowrate
- Vmax
– correction of the flowrate value up to which volume calculation
is performed
- Flow sign
– liquid flow direction sign
- Units
–
flowrate (volume) dimension
- Config.
– flowmeter configuration.
2.4.2. It also necessary to check whether the displayed flowrate sign
(" + " or "
–
") corresponds with the actual flow direction in the pipeline. In
case it does not correspond, it is necessary to check the correctness of
either PEA pair mounting or PEA pair connection considering the flow
direction. If mounting and connection are performed correctly you shall
check
Flow sign setting value (sign).
2.4.3. Settings / System settings / Connection settings and Settings / Pe-
riphery settings menu lets you configure settings to coordinate work of
flowmeter outputs with inputs of connected devices and equipment (see
Figs A.6, A.7 in Appendix A and tables B.4, B.5 of Appendix B).
In case of necessity, Settings / System settings / Total flow re-
set lets you perform the totalizer zeroing procedure.