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8
Consider the following example from Figure 4, using a Model 4450-25 mm Displacement
Transducer;
R 0 = 4250 digits
R 1 = 6785 digits
T 0 = 10° C
T 1 = 20° C
G = 0.004457 mm/digit
K = ((6785
D corrected = ((R 1 - R 0 )
D corrected = ((6785 - 4250)
D corrected = 11.298 + 0.137
D corrected = +11.435 mm
As can be seen from the above example, the corrections for temperature change are small
and can often be ignored.
4.3. Environmental Factors
Since the purpose of the displacement transducer installation is to monitor site conditions,
factors which may affect these conditions should always be observed and recorded.
Seemingly minor effects may have a real influence on the behavior of the structure being
monitored and may give an early indication of potential problems. Some of these factors
include, but are not limited to: blasting, rainfall, tidal levels, excavation and fill levels and
sequences, traffic, temperature and barometric changes, changes in personnel, nearby
construction activities, seasonal changes, etc.
0.000369) + 0.572)
G) + ((T 1 - T 0 )
0.004457) + ((20 - 10)
0.004457 = 0.0137
K)
0.0137)
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