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DFA400 Rev150730

Weldment Installation

Note: Ensure that the mounting location meets the requirements for uniform

water ow. (Refer to Flow Sensor Location Guide.)

Note: Ensure that there is enough room for the weldment, sensor, and

connector to t. (Refer to Figure 5.)

1. Drill and deburr a 1 11/16" to 1 3/4" diameter hole at mounting location.

2. Center weldment mount over hole and weld it to pipe. The weld must be

continuous around the tting with no gaps or voids.

3. Screw sensor housing into weldment far enough to make sure it goes through

the pipe freely, then back it out.

Note: The paddlewheel sensor must be correctly aligned in the water

stream. The alignment tab is used to set the sensor position. Make sure

the alignment tab is centered on the pipe center line. (Refer to Figure 5.)

4. Set sensor housing to dimension A in Figure 5. Make sure alignment tab is

centered on the pipe as shown (it can be on upstream or downstream side).

5. Install Tru-Seal locknut and tighten with 2" wrench using light to medium

torque. Make sure the sensor housing alignment tab remains centered and the

sensor housing does not rotate causing dimension A to change.

6. Insert ow sensor into sensor housing. Align at spot on sensor rim with

alignment tab and make sure O-ring is in groove.

Note: The retainer cap is hand-tightened. There is an inside lip that stops

the cap from turning when it makes contact with the alignment tab. This

provides the correct pressure to make the seal at the O-ring. Make sure

the ow sensor engages the alignment tab and does not rotate.

7. Install retainer cap and hand-tighten.

8. Connect cable from display module to ow sensor (cable is color coded blue).

(Refer to Wiring Section.)

FRC DFA400 User Manual

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