Replace The Impeller; Clean The Sensor - Hach Flow Paddlewheel Sensor Manual Del Usuario

9. Slowly turn the cap counterclockwise on each hex mounting adapter
to open the bleed petcock.
10. To extract the sensor from the pipe, turn the insertion tool handle
counterclockwise until the distance between the positioning collar and
the base of the insertion tool is 381–387 mm (15.0–15.25 in.).
11. Close the ball valve.
12. Loosen the captive nut and thumbscrews at the base of the tool.
13. Remove the insertion tool and the slotted-thread adapter. Attach the
slotted-thread adapter to the insertion tool.
14. Remove the sensor from the hex mounting adapter.
Figure 5 Insertion tool
1 Handle
2 Insertion tool
3 Thrust collar
4 Captive nut
5 Slotted-thread adapter
6 Lock nut

Clean the sensor

The sensor must be kept reasonably clean to maintain measurement
accuracy. The time period between cleanings is affected by the
14 English
7 Positioning collar
8 Thumbscrew
9 Bleed petcock
10 Mounting adapter
11 Ball valve
characteristics of the process solution and can only be determined by
operating experience.
1. Rinse the sensor with clean, warm water.
2. Inspect the impeller and shaft. Remove any tangled or fibrous material.
Turn the impeller to verify that it turns freely.
3. Examine the O-rings and replace if necessary. Refer to the
Replacement parts and accessories
4. Lightly lubricate the O-rings with silicone grease (provided in the
sensor kit). Remove any excess grease.

Replace the impeller

N O T I C E
Be careful not to damage the new ceramic shaft.
1. Remove the sensor from the mounting hardware.
2. Note the direction of the impeller blades, so that the new impeller is
installed in the same direction.
3. Position the sensor so that the word Outlet or the flow arrow points up
(refer to Figure 6 or Figure 7).
4. Hold the small diameter metal pin (supplied in the repair kit) against
the end of the old shaft.
5. Use a small hammer to lightly hit the small-diameter pin.
6. When approximately one inch of the old shaft extends from the sensor
body, use pliers to carefully pull the shaft out.
7. Hold the new impeller in the sensor so that it rotates in the correct
direction and push the chamfered end of the new shaft into the sensor
body.
8. Use a small hammer to lightly hit the new shaft until it is flush with the
sensor body.
9. Remove the two O-rings and install the new O-rings.
10. Lightly lubricate the O-rings with silicone grease (provided in the
sensor kit). Remove any excess grease.
11. Install the sensor into the mounting hardware.
on page 17.