Badger Meter Recordall Series - Page 7

Maintenance
Change-Gear Calibration
If the accuracy test of a meter-accessory combination indicates that an adjustment is required and change-gears are the
medium for calibration, proceed as follows:
1. Remove applicable Driver (Accessory) change-gear and Driven (Meter) change-gear.
OTE:N The number of teeth and outside diameter is stamped on each gear.
Meter (Driver)
Change Gear
Accessory (Driven)
Change Gear
Accessory
Device
Magnetic Gear
Train
Figure 2: Change-gear locations on model RCDL meters
2. Calculate the ratio of the existing change-gears as follows:
Ratio =
No. of Teeth on Accessory Change-gear
No. of Teeth on Meter Change-gear
3. Calculate the new change-gear ratio required by multiplying the ratio of existing change-gears by the percent of the
meter accuracy determined in the accuracy 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. If change-gear charts are available, select a new change-gear combination that matches the corrected change-gear ratio.
If new gears are not available, submit an order for corrective change-gears to the nearest Badger Meter Representative or
contact the Industrial Division of Badger Meter, Inc.
OTE:N When ordering, specify the serial number of meter, the meter model and size, the accessory device employed, the
number of teeth and diameter of existing change-gears, and the corrected change-gear ratio required.
5. Observe the position of the old change-gears on the spindles before removing them. Install the new change-gears on the
meter and accessory spindles and assemble the accessory to meter. Make sure you obtain full mesh when assembling the
accessory to the meter gear train adapter. Note the position information from the old gears.
Page 7 September 2014 RDM-UM-01089-EN-06