Appendix A
Channel Specific Settings and Features
136
Orion Versa Star Pro Meter User Manual
Thermo Scientific
Table 2 – Three Point LogR Temperature Calibration, Average Error at pH 3 and pH 11
Electrode
Average Temp.
Error
0 to 25 °C
(°C)
Average Temp.
Error
Above 20 °C *
(°C)
Average Temperature
Compensation Error
0 to 25 ºC
(pH Units)
Average Temperature
Compensation Error
Above 20 °C *
(°C)
8202BN
0.04
0.03
0.000
0.000
8203BN
0.04
0.01
0.000
0.000
8235BN
0.07
0.06
0.001
0.001
8256BN
0.04
0.06
0.000
0.001
8272BN
0.02
0.01
0.000
0.000
9202BN
0.03
0.06
0.000
0.001
9203BN
0.06
0.05
0.001
0.001
9206BN
0.02
0.02
0.000
0.000
9207BN
0.07
0.07
0.001
0.001
9256BN
0.02
0.00
0.001
0.000
9272BN
0.22
0.06
0.003
0.001
* For 20 °C temperature compensation spans
Active Replacement Electrode for Electrodes Listed in Table 1 and Table 2
Obsolete Electrode Available Replacement Obsolete Electrode Available Replacement
8202BN
8102BNUWP, 8102BN
9202BN
9102BNWP
8203BN
8103BNUWP, 8103BN
9203BN
9103BNWP
8235BN
8135BNUWP, 8135BN
9206BN
9106BNWP
8256BN
8156BNUWP, 815600
9256BN
9156BNWP
8272BN
8172BNWP
9272BN
9172BNWP
Advanced pH Electrode Diagnostics using LogR Technology
Electrode Troubleshooting Using LogR Technology
Many factors affect the performance of your pH combination electrode. While the majority of
problems seen in electrode performance relate to reference issues, changes over time in the
sensing glass can negatively affect performance. These effects can be monitored using a Versa
Star Pro meter with pH/LogR measurement module. This can save time by helping to identify
cases where cleaning and maintenance will not be able to rejuvenate the pH electrode.
Viewing Electrode Resistance
The pH electrode bulb resistance value can be viewed on the measurement screen when LogR
is selected for the temperature source. For detailed information on selecting and calibrating
LogR temperature, refer to the
LogR Temperature Calibration
section of this user manual.
