Campbell Scientific ST350 Strain Transducer for Structural Testing - Manual (Page 10)

Section 3. Sensor Alignment and Installation
3”
S URFACE PREP . LOCATIONS
FIGURE 3-2. Surface Preparation - Location
3.2 Installation
Once surface preparation is complete, the transducer can be installed using the
selected mounting technique (see Sections 5- Mounting of Sensors to Various
Surfaces). The two marks 1.5 inches from the center-line are used to locate the
transducer longitudinally; align these marks with the center of the transducer
feet. Notice that the front of the transducer (end opposite of the cable) as been
machined to a slight point. This point, along with the cable exit on the rear of
the transducer, should be aligned with the measurement axis line to ensure that
strain is being measured parallel to the measurement axis. An installed
transducer can be seen in the picture below. Note that if an R/C extension is
used, the longitudinal mark will need to be 30 inches long in order to be seen
behind the transducer/ extension combination. It is important that this line is
drawn carefully as the strains are inherently more susceptible to error due to
misalignment as the gage length increases.
FIGURE 3-3. ST350 Mounting Example
3-2