18 Culligan® CSM Series Softeners
18 Cat. No. 01016370
Location of the Paddlewheel Flow Sensor Package
The flow sensor is to be mounted on the outlet piping of each softener for single and duplex and triplex parallel systems
and in the common outlet piping of duplex alternating systems.
The piping that the flow sensor is being connected to should be the same diameter as the mounting fitting. The flow sen-
sor must also be located in a free-flowing straight run of pipe. This straight run includes the upstream piping and down-
stream piping of the flow sensor.
The proper length of upstream and downstream straight piping is a minimum of 10 pipe diameters of free-flowing straight
pipe upstream of the flow sensor and 5 pipe diameters of free-flowing straight pipe downstream.
EXAMPLE: A flow sensor that is installed on a length of 2” diameter straight pipe (see Figure 17).
Major obstructions will require considerably longer straight runs of upstream piping, due to the turbulence created by their
presence.
EXAMPLE: A flow sensor on a length of 2” diameter pipe that has a 90° elbow upstream from the desired location (see
Figure 18).
The examples below are intended as guide lines for the proper length of straight pipe required both upstream and down-
stream of the flow sensor installation point.
These recommendations are minimum requirements (see Figure 16).
10 x D5 x D
5 x D
5 x D
5 x D
5 x D5 x D
25 x D
15 x D 40 x D
20 x D
50 x D
Straight Pipe Two Elbows in Same Plane
Reducer Prior to Flow Sensor Two Elbows in Dif
ferent Planes
Single Elbow Prior to Flow Sensor
Valve Prior to Flow Sensor
Figure 16.
10 x D = 20”
5 x D
= 10”
Figure 17. Example: D = 2”
20 X D = 40”
5 x D
= 10”
Figure 18. Example: D = 2”
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