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Installation
3.2.3 Measure the sensor offset
The sensor offset is the distance from the top of the frame to the bottom of the pipe or
channel. This distance will be entered into the software and is necessary for accurate
flow calculations.
If the extended depth sensor (section 3.2.2.8 on page 24) is installed on the wall without
the extended frame, the sensor offset is the distance from the face of the extended depth
sensor to the bottom of the pipe or channel.
Prerequisites
• Rod
• Tape measure
Procedure
1. Put the rod in the bottom of the pipe or channel and align it vertically with the frame
(Figure 16).
2. Make a mark on the rod to identify where the top of the sensor frame is.
3. Measure the distance from the bottom of the rod to the mark. This is the sensor
offset.
Note: If it is not practical to measure to the bottom of the pipe, measure the distance from the
crown of the pipe to the top of the frame (Figure 16). Add this distance to the pipe diameter to
get the sensor offset (sensor offset = pipe diameter + distance from crown of the pipe to top
of frame).
Figure 16 Sensor offset
1 Distance from crown of pipe to top of frame 3 Sensor offset
2 Pipe diameter
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