Manual – Starflow QSD Model 6527B and 6537A
Unidata Manual - 6527B and 6537A Starflow QSD User Manual 08 05 2023.docx
Page 63
10.5.1. Creating an Area Rating Table
To calculate Flow, Starflow QSD uses a lookup table called the Area Rating Table. The
Area Rating Table is automatically generated when the scheme is saved from information
provided in the Flow extension instrument.
An Area Rating Table is created for each scheme. This table is generated by one of three
methods depending on the Starflow QSD site.
Type
Starflow QSD Site
How Created
Pipe
Partially filled circular pipe Enter offset, diameter, and dead sector in
the Area Rating Table window.
Open Channel Open channel and natural
stream
Entering the correct dimensions in the flow
extension instrument
User Defined
Other closed-in shapes,
like an ovoid pipe
Create a text file listing measurements.
Nominate this file in the scheme’s User
Rating file.
10.5.2. Partially Filled Pipe
There are four parameters needed to define a pipe installation.
Range (m)
Depth range of Starflow
QSD. This defines the depth range
able to be measured by the Starflow
QSD. There are two ranges: 2m and
5m although if the depth will never be
above the 1m range this should be
selected for greater precision. Define
the smallest maximum depth for the
channel that is compatible with your
Starflow QSD as this will give the best
results. For example - For a 2m depth
range Starflow QSD in a 900mm
diameter pipe choose 1 to improve
accuracy.
Offset (m)
Offset defines the offset
from the bottom of the pipe to the
position of the Starflow QSD depth
sensor. This is usually zero; however,
in some installations the Starflow QSD
may be located away from the bottom
(to avoid silt and rubbish).
Pipe Diameter (m)
Defines the pipe diameter.
Dead Sector (m)
The deadband due to siltation
(if any).