Geokon 4422, Instruction Manual

Page: 16 / 21

10
The following example shows that corrections for temperature change are usually small and can
often be ignored.
R
0
= 4773 digits
R
1
= 4589 digits
T
0
= 20.3 °C
T
1
= 32.9 °C
G = 0.001077 mm/digit
K = (((4589
×
0.00073) + 0.583)
×
0.001077) = 0.00424
Dcorrected = ((R
1
- R
0
)
×
C) + (((T
1
- T
0
)
×
K)
Dcorrected = ((4589 - 4773)
×
0.001077) + (((32.9 - 20.3)
×
0.000424)
Dcorrected = (-184
×
0.001077) + 0.00534
Dcorrected = -0.198 + 0.00534
Dcorrected = -0.193 mm
4.3 Environmental Factors
Since the purpose of the crackmeter installation is to monitor site conditions, factors that 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, traffic, temperature and barometric changes, weather conditions, changes in
personnel, nearby construction activities, excavation and fill level sequences, seasonal changes,
etc.