Manual – Starflow QSD Model 6527B and 6537A
Unidata Manual - 6527B and 6537A Starflow QSD User Manual 08 05 2023.docx
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6.2. Instrument Mounting – Pipes & Culverts
A typical installation is in a pipe or culvert with diameters between 150mm and 2000 mm.
The Starflow QSD should be located near the downstream end of a straight and clean
culvert, where non-turbulent flow conditions are maximised. The mounting should ensure
the unit sits right on the bottom to avoid debris catching beneath it.
It is recommended that in open pipe situations, the instrument is situated five times the
diameter from the opening or discharge. This will allow the instrument to measure the best
possible laminar flow. Keep the instrument away from pipe joints. Corrugated culverts are
not suitable for Starflow QSD instruments.
Diagram showing instrument five diameters in from pipe opening.
In culverts, the sensor can be mounted on a stainless-steel band that is slipped inside the
pipe and expanded to lock it in position. In open channels, special mounting brackets may
be required.
The Model 6705 Expanding Band kit allows you to install a Starflow QSD instrument into a
pipe. The kit design is modular, allowing it to fit into any size pipe. The band is flexible
enough to fit irregular shapes, such as ovoid (egg-shaped) sections. All components are
made from stainless steel, and the band fittings are 100mm wide to fit the standard Starflow
QSD mount.
Although pipes come in standard diameters, their dimensions are not always accurate. This
means that an expanding band system must allow the installer to make adjustments on-site.
To achieve this, the Model 6705 system is made so that general assembly can be done in
the workshop, whilst adjustments can be made in the field with hand tools. An expanding
turnbuckle locks the band into the pipe.
To determine what installation hardware is needed
for pipe installation, the pipe diameter needs to be known.
