Teledyne 4220 installation and operation guide For Example

4220 Flow Meter

Section 2 Programming

If you select ROUND PIPE for the Manning flow conversion, the following displays will appear:

MANNING ROUND PIPE

SLOPE = X.XXXXX ROUGH = X.XXXX

Slope is entered as a dimensionless quantity, delta Y/ delta X, not as percent slope. Or, as otherwise expressed:

	ΔX	=		Rise
	ΔY
				Run
For		1
example:			= .01
		100

Roughness coefficients are published in the Isco Open Channel Flow Measurement Handbook. You must know the material the pipe is made of. The roughness coefficients are published for all common materials in three grades: minimum, normal and maximum. Then:

MANNING ROUND PIPE

DIAMETER = X.XXX FEET (or meters)

If you select U-CHANNEL for the Manning flow conversion, the following displays will appear:

MANNING U-CHANNEL

SLOPE = X.XXXXX ROUGH = X.XXX

(

Slope and roughness are entered as for ROUND PIPE previ- ously.) Then:

MANNING U-CHANNEL

WIDTH = X.XXX FEET (or meters)

If you select RECTANGULAR for the Manning flow conversion, the following displays will appear:

MANNING RECTANGULAR

SLOPE=X.XXXXX ROUGH=X.XXX

(Slope and roughness are entered the same as for ROUND PIPE previously.) Then:

MANNING RECTANGULAR

WIDTH=X.XXX FEET (or meters)

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