Badger Meter Irrigation Sensors - 1/2 and larger" - Manual (Page 9)

IMPELLER ASSEMBLY AND SHAFT REPLACEMENT
If you are replacing an existing Badger Meter impeller or shaft and have already calibrated your fl ow monitor/
transmitter, no calibration changes are necessary. For installation of a new fl ow monitor or for relocation of a sensor in
a new pipe size, please refer to the calibration instructions in fl ow monitor manual.
1. Depressurize pipe from which sensor is to be removed.
2. If insert style (Models 228xx) remove the three lock nuts that secure the positioning collar to the threaded rods
of metal sensor.
NOTE: Before removing lock nuts, record the dimension from top of 2 inch NPT adapter to the bottom of the positioning
collar. This dimension will be required later to reinstall. For Series 250BR style remove the clevis pin.
3. Remove the sensor from the hex adapter or the tee.
4. Note the impeller blade orientation relative to fl ow arrows and the alignment hole in metal sensors beside one
of the sight holes. In order to maintain proper calibration, the impeller will have to be reinstalled in the same
manner with the impeller blades pointing toward the small alignment hole, and into the fl ow direction as
indicated by the fl ow arrows.
5. To remove the old impeller blade assembly, push the old shaft out of the sleeve with the new shaft (or small
diameter rod) just far enough to grab the end with a pair of pliers and pull the shaft completely out. The
impeller assembly will now be free, and will drop out.
6. Inspect the shaft and bearings for wear, and replace as necessary.
7. Refer to Figure 1. To reinstall, position the impeller in the cavity oriented as in Step 4 so that the impeller
blades point into the fl ow direction and toward the small alignment hole located beside one of the sight ing
holes on metal sensors. For 250B the fl ow direction arrow on the top of the sensor housing should point
downstream with the impeller blades pointing upstream.
8. Carefully push the shaft through the sleeve and impeller, taking care not to damage bearings. Make sure that
the shaft is inserted far enough so that it clears the sleeve on each side of the impeller housing.
NOTE: If shaft is not carefully installed, the bearing can be deformed, preventing free rotation.
9. Inspect the O-rings for damage and replace as necessary. Clean the O-rings and the sleeve and lubricate with
silicone grease from the packet provided or some other acceptable lubricant.
NOTE DIRECTION OF ARROW
USE PLIERS HERE
NOTE DIRECTION OF
IMPELLER
USE METAL PIN TO
REMOVE CERAMIC SHAFT
10. Install the sensor into the 2 inch NPT adapter or tee so that alignment hole is facing upstream and fl ow arrows
point in the direction of the actual fl ow. Since the positioning collar was not loosened during this operation,
Installation & Operation Manual
Page 9 August 2012