Campbell Scientific ST350 Strain Transducer for Structural Testing - Manual (Page 21)

Section 5. Mounting of Sensor to Various Surfaces
- If the Tab/Glue method is being used ensure that the area is clean of
dust before installing the gage. A can of compressed air or an air
compressor is a great way to ensure a dust-free gluing area.
5.2.4 Timber
1. Examples:
Bridges, building components (columns, joists, floor systems, etc), piles.
2. Methods for attached ST350:
a. Tab/ Glue: See above.
b. 2. Self-tapping Phillips-head screws:
- Washers are required to ensure that the head of the screw does not
sink into the transducer mounting hole.
- Use a power screwdriver to drive the screw until it is 1/16” from
the surface of the transducer then hand-tightened with a standard
Phillips screwdriver.
3. Installation method for best measurements:
Self-tapping screws
4. Pitfalls to avoid during installation:
- In many situations the timber members that the transducers are going
to be mounted to are twisted. This surface must be flattened using
appropriate techniques to reduce the chance of damage to the
transducer.
- If the wood has any sort of glue laminated section or chemically
treated, it is recommended that pilot holes be drilled.
5-7