4220 Flow Meter
Section 4 Submerged Probe Installation
the mounting ring are not suitable, you must build your own mounting hardware. Figure
Certain flume manufacturers produce flumes with
Note
Always install the submerged probe pointing toward normal flow at the
Table 4-1 Locating the Head-Measuring Point
Device
Head-Measuring Point
Weirs | Upstream from the weir plate by at least 3 times the |
| maximum head. |
|
|
Parshall Flumes | 1/3 of the way into the converging section. |
Upstream from the flume entrance by half the pipe | |
Flumes | diameter. |
|
|
Note
When installing the probe with custom hardware, remember to attach the probe securely to the side or bottom of the flow stream and tie the cable down so that it does not collect debris.
For many primary measuring device installations, the sub- merged probe mounting rings or base sections discussed previ- ously may be used to mount the probe at the appropriate location. In many installations, though, the mounting rings or bases may not be suitable.
Mounting hardware may have to be fabricated locally to allow the level sensor to be mounted at the correct location in the primary device. The only requirements for custom mounting hardware are:
•The probe must be securely attached to the side or bottom of the flow stream.
•The cable must be tied down and led out of the flow stream in an orderly manner.
•The hardware be made from
It should be noted that the mounting rings may be used to install the probe in rectangular channels by simply putting right angle bends in them at the appropriate locations. It should be noted
