| Specification |
| Model |
Orion 4-Star Plus pH/Conductivity Benchtop Multiparameter Meter |
| pH Mode |
| Range |
-2.000 to +19.999pH |
| Resolution |
0.1/0.01/0.001pH |
| Relative Accuracy |
±0.002pH |
| Calibration Points |
AUTO-CAL* and/or Manual Calibration; 1 to 5 points; US/NIST, DIN, and custom buffers recognized |
| mV/RmV/ORP Mode |
| Range |
±1999.9mV |
| Resolution |
0.1mV |
| Relative Accuracy |
±0.2mV or 0.05%, whichever is greater |
| Calibration Points |
EH autocalibration to standard hydrogen electrode for ORP measurements |
| Conductivity Mode |
| Range |
0.000 to 3000mS/cm, auto resolution with cell constant dependence |
| Resolution |
4 signi?cant digits down to 0.001µS/cm, cell constant dependent |
| Relative Accuracy |
±0.5% ± 1 digit or 0.01µS/cm, whichever is greater |
| Cell Constants |
0.001 to 199.9cm-1 |
| Cell Compatibility |
Planar Conductivity Cell; pH glass membrane; ISFET solid-state electrode |
| Calibration Points |
DirectCal*/AUTO-CAL*: 1 to 5 points/1 to 3 points |
| Resistivity Mode |
| Range |
0.0001 to 100Megohm |
| Resolution |
Autoranging |
| Relative Accuracy |
±0.5% ± 1 digit |
| Salinity Mode |
| Range |
0.1 to 80.0ppt NaCl equivalent; 0.1 to 42ppt practical salinity |
| Resolution |
0.1ppt |
| Relative Accuracy |
±0.1ppt ± 1 digit |
| TDS Mode |
| Range |
0 to 19,999mg/L |
| Resolution |
1mg/L |
| Relative Accuracy |
±0.5% ± 1 digit |
| Adjustable TDS Factor |
0.00 to 10.00% |
| Reference Temperature |
5°C, 10°C, 15°C, 20°C or 25°C (default); autoranging |
| Temperature Mode |
| Range |
-5° to +105°C |
| Resolution |
0.1°C up to 99.9°C, 1.0°C over 99.9°C |
| Relative Accuracy |
±0.1°C, ± 1 digit |
| Temperature Compensation |
Conductivity, nLF, linear; pH, auto/manual -5° to +105°C |
| Display |
Custom LCD; simultaneous display of selected measurement and temperature, pH calibration points, and current electrode condition |
| Inputs/Outputs |
| Inputs |
8-Pin Mini-DIN Locking for Conductivity or ATC probe; BNC for pH or ORP electrode; Pin tip for separate reference electrode; Phono jack for stirrer |
| Sensor Types |
2 Cell, 4 Cell, or Planar Conductivity Cell; pH or ORP electrode |
| Outputs |
Bidirectional RS-232, stereo jack, optional USB interface cable |
| Data Management |
GLP Electrode Veri?cationSaves 750 points by time, stability or manual read with time/date stampCalibration log of last 10 calibrationsUser method storage for 10 proceduresAdvanced self-test and diagnostics routinesPassword protectionDownloadable software and methods updates via Internet |
| Compliance |
Meets all U.S. Pharmacopeia (USP) requirements; 21 CFR Part II Compliant with optional software |
| Certifications |
CE, CSA, UL, TUV, FCC Class A limits |
| Environmental Operating Conditions |
| Ambient Operating Temperature |
5° to +45°C |
| Relative Humidity |
5 to 85% noncondensing |
| IP Rating |
IP54 compliance: splashproof and dustproof |
| Stability |
SMART STABILITY* and SMART AVERAGING*: Resolution dependent/automatic |
| Power Supply |
Universal AC power adapter or 4 x 1.5V AA (optional) |
| Warranty Period |
Three years from date of purchase |
