| Specifications |
| Model |
Orion 4-Star Plus pH/mV/Conductivity Portable Multiparameter Meter |
| pH Mode |
| Range |
-2.000 to +19.999pH |
| Resolution |
0.1/0.01/0.001pH |
| Relative Accuracy |
±0.002pH |
| Calibration |
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 |
| ORP Calibration |
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 |
| Celll Compatability |
2 Cell, 4 Cell, or Planar |
| Calibration |
DirectCal*/AUTO-CAL*: 1 to 5 points/1 to 3 points |
| Reference Temperatures |
5°C, 10°C,15°C, 20°C or 25°C (default); autoranging |
| 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 |
±0.5% ±1 digit |
| TDS Mode |
| Range |
0 to 19,999mg/L |
| Resolution |
1mg/L |
| Relative Accuracy |
±0.5% ±1 digit |
| Adjustable TDS Factor |
0.0 to 10.0% |
| 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°, ±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 |
Waterproof 8-Pin Mini-DIN Locking for Conductivity or ATC; waterproof BNC for pH or ORP electrodes; Pin tip for separate reference electrode; Phono jack for stirrer |
| Sensor Types |
2 Cell, 4 Cell, or Planar Conductivity cell; pH or ORP electrodes |
| Outputs |
Waterproof bidirectional RS-232, stereo jack, optional USB interface cable |
| Data Management |
GLP Electrode Veri?cationSaves 500 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 |
| GLP Compliance |
21 CFR Part II Compliant with optional software |
| Regulatory and Safety Compliance |
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 |
IP67 Waterproof |
| Stability |
SMART STABILITY* and SMART AVERAGING*: Resolution dependent/automatic |
| Power Supply |
4 x 1.5V AA batteries |
| Warranty |
Three years from date of purchase |
