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APPENDIX G. MODEL 4150-5 EXTENDED RANGE
STRAIN GAUGE
The Model 4150-5 strain gauge, a modified version of the 4150 gauge, features
a range of 10,000 microstrains. Note the following when using the 4150-5:
■
The gauge is installed in the same manner as the standard 4150 gauge;
however, the position within the range should be set by the user, using the
calibration report for each gauge as a guide.
■
Push or pull gently on the gauge before spot welding the second tab.
■
For maximum accuracy, use polynomial data reduction equations.
■
4150-5 gauges are individually calibrated due to the technique used to
obtain the required range.
■
The thermal coefficient of the gauge is also different from the standard
gauge, in that it varies throughout the range of readings. Use the
instructions below to make corrections for temperature effects:
WHEN USING THE LINEAR EQUATION:
Strain = G[R
EQUATION 19: Model 4150-5 Temperature Effects
Where:
K = (M*R
1
M is 0.0002205
B = –0.03886
G is the linear gauge factor = 1.0296 microstrain/digit (position B)
R
is the current reading
1
R
is the initial reading
0
T
is the temperature of R
1
T
is the temperature of R
0
For example:
If:
R
= 6682
1
R
= 6596
0
T
= 30.13C
1
T
= 20.09C
0
K = [(0.0002205*6682) – 0.03886] = 1.4345
Then, after temperature correction;
Strain = 1.0296[(6682-6596) +1.4345(30.13-20.09)] =+ 103 microstrains.
WHEN USING THE POLYNOMIAL EQUATION:
The value of R
equation.
Using the same example as above, the correction to R
1.4345(10.04) = +14.4.
Therefore, if the current value of R
which must be entered into the polynomial equation is 6682+14.4 = 6696.4.
MODEL 4100/4150 SERIES VIBRATING WIRE STRAIN GAUGES | MODEL 4150-5 EXTENDED RANGE STRAIN GAUGE | 33
– R
) – K
(T
– T
)]
1
0
t
1
0
+B)
1
0
for temperature must be corrected before using the polynomial
1
is 6682, the value (corrected for temperature)
1
is K(T
–T
) =
1
1
0
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