Specifications

A Remote Automated Water Quality Stream Gauging System Design 9
9
Figure 4 Starflow velocity probe mount (a) and turbidity probe mount (b).
The turbidity sensor is encased in 25 mm NB steel pipe integrated into the mounting
assembly. A stainless steel grub screw is situated on the underside of the mount which is
tightened to hold the sensor in place.
The depth sensor mount is directly bolted and glued into the top of the concrete footing or
substrate. It is located to one side of and slightly behind the main pier. The axis of the sensor
is perpendicular to flow so that the cable end is protected by the sensor mount.
The inlet for the sample hose is attached to the underside of the top plate of turbidity sensor
mount (Figure 4b). A right angled brass joiner is used to run the hose down the clamp via the
attachment guides.
A pump housing (Figure 5) is also required for sites with a submersible pump. This
component is attached using the bottom bolts joining the Starflow and turbidity mounts.
3.3. Routing cable
All exposed cable must be protected against snagging by debris and abrasion from particles
in the water. It is also desirable to have 0.5 m to 1 m of excess cable at the mount end to
allow the sensors to be removed for maintenance and testing.
To achieve this, all cables are covered by conduit, tightly fastened to the mount and routed
through a B&R enclosure attached to the concrete base, directly behind the pier (Figure 5).
The cables and hose from the mount can be run through a length of 50 mm corrugated
conduit terminating with a 50 mm gland. The Starflow cable must be inserted first due to the
large size of the interface plug. The required amount of excess cable can be left in this box.
(a) (b)