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28 | MODEL 4200HT-T HIGH-TEMPERATURE STRAIN GAUGE | GEOKON
APPENDIX F.
MODEL 4200HT-T HIGH-TEMPERATURE
STRAIN GAUGE
Model 4200HT-T High-Temperature Embedment Strain Gauge is similar
GEOKON
to the Model 4200, but is constructed using components that can withstand
temperatures up to 220 °C. It is particularly useful for measurements in
autoclaved spun concrete piles.
FIGURE 18: Model 4200HT-T
Data interpretation is the same as that outlined in Section 6, with the exception
of the Temperature Coefficient, which for the 4200HT-T is 17.3/ °C. Coil
resistance for Model 4200HT-T is 50 ohms.
The thermistor included with the gauge is a high-temperature thermistor, which
uses the resistance to temperature conversion table shown in Table 12 on
page 25. When using a readout box, it is not necessary to connect the green and
white wires to the readout because the temperature shown on the readout will
be incorrect. Instead, use a digital ohmmeter.
TO READ TEMPERATURES USING AN OHMMETER
1.
Connect an ohmmeter to the green and white thermistor leads coming from
the strain gauge. (Since the resistance changes with temperature are large,
the effect of cable resistance is usually insignificant.)
2.
Look up the temperature for the measured resistance in Table 12 on
page 25.
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