Badger Meter Irrigation Sensors - 1/2 and larger" - Manual (Page 3)

Installation & Operation Manual
the impeller friction to increase, which may affect
performance at low flow rates. Any circumferential
location is correct for installation in vertical pipes.
3. An insertion depth of 1-1/2 inches for pipe sizes
2.5 inches and larger is required for accurate flow
rate calibration. Detailed installation instructions
for various sensor mounting configurations on the
following pages include methods for ensuring correct
insertion depth.
4. Alignment of the sensor to ensure that impeller
rotation is parallel to flow is important. Alignment
instructions are also included on the following pages.
INSTALLATION FOR 220BR, 220SS
Installation Procedure
The insertion depth and alignment of the sensor assembly
are critical to the accuracy of the flow measurement. The
flat end of the sensor tube assembly MUST BE INSTALLED
1-1/2 inches from the inside wall of the pipe. In order to
allow for variations in wall thickness, lining, or coatings the
depth adjustment is controlled by the position of the Hex
Nuts on the three threaded studs of the hex mounting
adapter. The hex mounting adapter is provided with a 2
inch male NPT connection.
There are two methods of mounting these sensors in a
2.5 inch or larger pipe. One is with a 2 inch NPT threaded
pipe saddle. The other is with a welded-on fitting such as
a Thredolet®, also tapped for a 2 inch NPT connection. In
either case, cut a 2 inch hole through a depressurized pipe
and then secure the saddle or weld-on fitting to the pipe.
(For drilling into a pressurized pipe, see instructions for
Series 225 and 226 sensors.) Install the 2 inch NPT adapter
provided, using a thread sealant to prevent leakage.
Tighten as necessary. Badger Meter insert style sensors are
calibrated with the sensor inserted 1-1/2 inches into the
pipe flow.
To determine the proper insertion depth, proceed as
follows:
1. Apply anti-seize thread lubricant , supplied with
the sensor, to the threaded studs of the mounting
adaptor.
2. Insert the depth gauge into the mounting adapter
and set it against the inside wall of the pipe as shown.
Set the top of the upper adjusting nut to 3-3/4 inches
as measured. Lock it in place with the bottom nut on
the same stud. Repeat for the other adj. nuts.
Note: For Model 220PVS - set nuts 6.5 inches above inside wall of pipe.
INTRODUCTION
Used in conjunction with any Badger Meter impeller flow
monitor or transmitter, Badger Meter non-magnetic flow
sensors provide an accurate rate of liquid flow as well as
total accumulated flow. A number of sensor models are
offered, which cover applications for a wide range of pipe
sizes and pressure/temperature specifications.
The flow sensors generate a frequency which is
proportional to flow rate. An internal preamplifier allows
the pulse signal to travel up to 2000 feet without further
amplification. Power to operate the sensor is provided by
the flow monitor. The impeller bearing assembly, shaft and
O-rings are replaceable in the field.
Badger Meter flow sensors feature a closed, six-bladed
impeller design, using a proprietary, non-magnetic
sensing technology. The forward-swept impeller shape
provides higher, more constant torque than four-bladed
impeller designs, and is less prone to fouling by water-
borne debris. The forward-curved shape, coupled with the
absence of magnetic drag, provides improved operation
and repeatability, even at lower flow rates. As the liquid
flow turns the impeller, a low impedance signal is
transmitted with a frequency proportional to the flow rate.
Sensors of similar type are interchangeable, so there is no
need for recalibration after servicing or replacement.
MECHANICAL INSTALLATION
General
Flow measurement accuracy for all flow measuring
devices is highly dependent on proper location in the
piping system. Irregular flow velocity profiles caused by
valves, fittings, pipe bends, etc. can lead to inaccurate
overall flow rate indications although local flow velocity
measurement may be accurate. A sensor located where
it can be affected by air bubbles, floating debris, or
sediment may not achieve full accuracy and could be
damaged. Badger Meter flow sensors are designed
to operate reliably under adverse conditions, but the
following recommendations should be followed to ensure
maximum system accuracy:
1. Choose a location along the pipe where 10
pipe diameters upstream and 5 pipe diameters
downstream of the sensor provide no flow
disturbance. Pipe bends, valves, other fittings, pipe
enlargements and reductions should not be present
in this length of pipe.
2. The preferred location around the circumference of a
horizontal pipe is on top. If trapped air or debris will
interfere, then the sensor should be located further
around the pipe from the top but not more than 45
degrees from top center. The sensor should never
be located at the bottom of the pipe, as sediment
may collect there. Locations off top center cause
Page 3 August 2012