Badger Meter Water Conditioning - Manual (Page 9)

Change Gear Corrections
If the test indicates that an adjustment is required, proceed as follows:
1 Remove the change gears from the spindles by loosening the setscrew
NOTE: N Both the O D dimension (in decimal inches) and the number of teeth are stamped on each gear
2 Calculate the ratio of existing change gears as follows:
Ratio =
No of Teeth on Register Change Gear
No of Teeth on Meter Register Base
3 Calculate the new change gear ratio required by multiplying the ratio of existing change gears by percent-of-meter
accuracy determined in test
Example:
Existing Change Gear Ratio =
42 Teeth
= 0 976
43 Teeth
Meter Accuracy = 95 %
Corrected Change Gear Ratio = 0 976 x
95
= 0 927
100
4 Select a combination of new change gears that match the corrected change gear ratio If stocked change gears are
not available, submit order for change gears to your nearest Badger Meter representative or the Industrial Division of
Badger Meter Inc
NOTE: N When ordering, give the serial number of the turbo meter which is stamped on the outlet flange of the meter Specify
the meter size and accessory employed along with the number of teeth and diameter on existing change gears
Specify the corrected change gear ratio
5 Install the corrected change gears, taking care that the correct change gears are assembled to the appropriate spindles
(see example in figure below) For registers, refer to Servicing section for instructions covering the proper method of
installing and meshing change gears On meters with 76 Series registers, provision for change gear adjustment is built in
See the applicable register IOM manual for recalibrating instructions
Figure 2: Change Gear Location, Register Base and Register Assembly
Electronic Scaling Correction
If the test results indicates an adjustment is required, see the instruction manual for that accessory for procedure to change
scale factor
User Manual
Page 9 November 2013