Badger Meter Water Conditioning - Manual (Page 10)

Calibrating 2" and 3" Meters
The 2" and 3" turbo meters with bronze and cast iron housings and bronze heads are equipped with a bypass valve for minor
calibration adjustment in the field Test the meter's accuracy to determine if recalibration is required If the meter is out of
calibration, proceed as follows:
Figure 3: Calibrating 2" and 3" Turbo Meters
1 Remove the bypass cover nut with a wrench
2 Using a wide-bladed screwdriver, loosen the bypass valve lock ring
3 Adjust the bypass valve with a screw drive in the following manner:
a To INCREASE registration, turn the slot in the valve perpendicular to the axis of the meter (line of flow) This will restrict
the amount of volume flowing through the bypass and increase flow through the metering chamber
b To DECREASE registration, turn the slot in the valve parallel to the axis of the meter This will increase liquid volume
through the bypass and decrease flow through the metering chamber
NOTE: N The total range of the bypass adjustment occurs within a 90 degree or quarter turn of the valve from the parallel,
inline position to the perpendicular position, or vice versa The total range of adjustment is about four percent Tested
and calibrated at the factory, the bypass valve will be set at about 45° from the full "open" or "closed" position This
setting will allow for a ±2% adjustment to recalibrate the meter in the field
3 With the valve turned to the desired bypass setting, tighten the valve lock ring
4 Install and tighten the bypass valve cover nut
5 Retest the meter to confirm the accuracy of the bypass adjustment If the meter is still out of calibration, repeat the
procedure outlined above
Register Base Replacement
Badger turbo meters can be serviced without removing the meters from the system To inspect or replace component parts
of the head assembly, close the upstream and downstream valves If the installation is equipped with an inlet and drain valve
for flushing the meter, open the drain valve to relieve pressure from within the meter However, if the meter piping is not
equipped with a drain valve, proceed as follows to relieve pressure within the meter:
1 Do not remove the register base from the operating head assembly The entire head assembly must be removed as a
complete unit (See figure below)
2 Loosen each of the head bolts about one and one-half turns Do not remove the bolts completely
3 If the gasket-seal between the meter head and the housing is not leaking at this time, pry the head assembly loose with
a screwdriver To accomplish this, insert the screwdriver from the outlet side of the head assembly where the head and
housing join together
Industrial Turbo Meters, Sizes 2" through 6"
Page 10 November 2013