Table 1.
Specifications for the pH Sensors used in this study.
| BP | CCA | STR EP | SU EP | SU OPT | |
|---|---|---|---|---|---|
| Method | Electrochemical | Electrochemical | Electrochemical | Electrochemical | Optical |
| Location | At-line | At-line | In-line | In-line | In-line |
| Reusable/Single-Use | Reusable | Single-use | Reusable | Single-use | Single-use |
| Measurement Range | 0–14 | 5.0–8.0 | 0–14 | 2–8.5 | 4.5–8.5 |
| Control Range | NA | NA | NP | NP | 6.0–8.0 |
| Measurement Accuracy | ±0.01 pHa | ±0.05 pH | ±0.01 pHa | ±0.02 pH | ±0.05 pH when within ±0.25 pH from offset calibration; ±0.1 pH when within 0.25–0.5 pH from offset calibration |
| Control Accuracy | NA | NA | NP | NP | ±0.05 pH |
| Temperature range | 0–100 °C | Approximately 37 °Cb | 0–140 °C | NP | NP |
| Probe material | HA glass | NA | Hamilton Type PHI glass | NP | Luminophore dye attached to a polycarbonate backing |
| Diaphragm | Ceramic | NA | Ceramic (HP-Coatramic) | NP | NA |
| Electrolyte | 3 M KCl | NP | Pressurized Phermlyte | NP | NA |
| Reference System | ARGENTHAL™ with Ag+-trap | NP | Hamilton Everef-F Ag+ system | NP | NA |
| Autoclavable | NP | NA | Yes | NA | NA |
| Steam sterilizable | NP | NA | Yes | NA | NA |
| Gamma irradiated | NA | NA | NA | Yes | Yes |
NA: Not applicable.
NP: Not provided within manufacturer specifications.
a
Based on uncertainty of RICCA pH standards 4.0, 7.0, and 10.0 used for probe calibrations.
b
Samples loaded onto the CCA are kept at or warmed to 37 °C prior to pH measurement.