Teledyne 4220 installation and operation guide Meter, Flow Stream

4220 Flow Meter

Section 3 Installation

3.3.2Location of the Flow Because the flow meter uses a submerged probe for level mea-

Meter	surement, you do not have to install it directly above the primary
	measuring device, or even particularly close to the flow stream.
	You can install the flow meter in a convenient, protected location
	and route the submerged probe cable to the place where the level
	sensor is mounted.
	For example, you can install the flow meter above ground for pro-
	tection and easy accessibility, and then you only need to enter the
	manhole once, for submerged probe installation and calibration
	You will need to mount the unit within 25 feet (7.6 m), if you
	connect the probe directly to the flow meter.
	You can extend the distance to 50 feet (15.3 m) if you use the
	optional 25 Foot Extension Cable. Using the optional 50 Foot
	Extension Cable lets you increase the distance to 75 feet (22.8
	m).
	For distances up to 1,000 feet, (304.8 m) use the optional
	Quick-Disconnect Box. Distances greater than 1,000 feet are not
	recommended. Details on the extension cables and Quick-Dis-
	connect Box can be found in Section 5 of this section.

3.3.3Mounting the 4220 The 4220 does not have any special requirements for mounting. You can locate it on any relatively flat surface either horizontally, supported by the two mounting pads and the stainless steel mounting bracket, or vertically, supported by the two plastic rails on the bottom of the case.

You can also panel-mount the flow meter, using the mounting bracket on the top rear of the case or suspend it from a ladder rung using the optional suspension bracket. To use the bracket, the carrying handle should first be installed on the flow meter as described above. Then slip the handle through the suspension bracket.

3.3.4Suspension Above the If you suspend the flow meter above the flow stream and there is

Flow Stream	any possibility of accidental submersion, attach several feet of
	vinyl tubing to the open vent on the end of the external desiccant
	cartridge. You should route this tubing to a place higher than the
	maximum possible level of the flow stream. This will prevent any
	water from entering the vent tube for the submerged probe in
	case of accidental submersion of the flow meter. Vinyl tubing can
	be purchased locally or from Teledyne Isco.

3.4Quick-Disconnect Box If you use the Quick-Disconnect Box to extend the distance between the flow meter and the probe, you should attach the vinyl tubing to the desiccator cartridge vent on the Quick-Dis- connect Box.

You can install the flow meter as far as 1,000 feet from the sub- merged probe if you use the Quick-Disconnect Box. Otherwise, the flow meter must be located within 75 feet of the submerged probe, as this is the maximum length of cable available to connect the submerged probe to the flow meter (25 feet supplied with the submerged probe plus 50 feet maximum with one of the

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