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Thermo Scientific Orion Star LogR™ Meter User Guide
Appendix B
About LogR Technology
LogR Temperature Measurements
Orion Star LogR meters allow for direct temperature measurement and temperature
compensation from your pH electrode. With simultaneous measurement of pH
and temperature, the patented digital LogR technology makes this possible using
most standard glass pH electrodes. The system is based on using the electrical
resistance of the glass sensing bulb as the temperature probe. The logarithm of
the resistance of the bulb varies almost linearly with the reciprocal of the absolute
temperature (see
Figure 1
). Almost all common pH glasses show a similar
decrease in resistance with increasing temperature, and can be used with other
meters. However, only the exact shape of the curve of PerpHecT electrodes is
in the meter’s memory. To maximize system performance and accuracy, use a
PerpHecT or PerpHecT ROSS pH electrode.
Figure 1
– LogR Resistance vs. Temperature Graph LogR™ Temperature Accuracy
Tables
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