Teledyne 4220 installation and operation guide Other Mounting Techniques

4220 Flow Meter

Section 4 Submerged Probe Installation

A variety of threaded fasteners should be available in various overall and thread lengths; a minimum thread length of 1/4 in. (0.63 cm) is recommended. Be sure to follow the manufacturer's instructions carefully, and observe all safety precautions.

4.3.5Completing the Probe The probe installation is finished by coiling any excess sensor

Installation	cable and securing it using cable clamps or other means. The ref-
	erence tube inside the cable can be restricted or blocked if the
	cable is kinked, sharply bent, or otherwise pinched. The sensor
	cable should be handled and mounted with care. Also, if there is
	any appreciable distance between the point where the sensor
	cable leaves the mounting apparatus and the location of the flow
	meter, be sure to attach the cable to the flow stream wall to
	prevent it from vibrating, moving around, tangling, or possibly
	collecting debris.

CAUTION

Under no circumstances should you leave any extra length of sensor cable dangling freely in the flow stream where it could trap debris or become tangled.

Use gloves and eye protection when assembling and installing the rings in a pipe. Though deburred, the edges of the stain- less steel can cut if improperly handled. Please read the infor- mation on how best to install this device.

Observe general safety procedures when entering any man- hole. See “General Safety Procedures” in the back of the man- ual for more information on general hazards and necessary precautions.

Note

The countersunk holes on the base section near the mounting tabs are for use with the four-foot probe extension (no longer sold) only. Do not attempt to use them to mount the probe car- riers or the probes themselves.

4.4Other Mounting Techniques

4.4.1Rectangular Pipes and You can install the probe in rectangular channels by bending a

	Channels	mounting ring to fit the channel. Attach the ring to the channel
		wall with studs.
4.4.2	Stilling Wells or	In flow streams with a minimal flow velocity or in a stilling well,
	Streams with Very Low simply attach the probe to a weighted plate and submerge the
	Velocity	plate in the stream or stilling well.
4.4.3	Weirs and Flumes	The 4220 Flow Meter is generally used with some type of
		primary measuring device, such as a weir or flume. The
		placement of the submerged probe in the primary device is deter-
		mined by the type of primary device. You can use one of Isco’s
		mounting rings to install the probe in many weirs and flumes. If

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