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Orion Star™ A221 Portable pH Meter



Record accurate and reliable pH, mV, ORP and temperature measurements with the Thermo Scientific™ Orion Star™ A221 Portable pH Meter. This meter is ideal for a wide range of applications and advanced pH analysis in the field. Perform up to a 5 point pH calibration, log up to 1000 data point sets with time/date stamp and easily transfer calibration and data logs via USB or RS232 to a printer or computer with free downloadable Orion Star™ Com software. Waterproof meter ensures durable, rugged performance in outdoor environments with an IP67-rated housing.


AC Adapter Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
Accuracy (mV) ±0.2 mV or ±0.05% of reading whichever is greater
Accuracy (pH) ±0.002
Alarm Output Calibration due alarm (fixed 12 hour)
Backlight Option Yes, selectable
Battery Life 800 hr.
Battery Type 4 x AA
Calibration pH, relative mV (RmV), ORP and temperature
Calibration Points 1 point relative mV (RmV) mode, 1 point ORP mode
Certifications/Compliance CE, TUV 3-1, FCC Class A
Data Management Details Transfer single, range or all data points to printer or computer
Data Points 1000 with date and time stamp
Description Orion Star A221 pH portable meter
Channels 1
Display Type LCD Graphic, Backlit
IP Rating IP 67
Measurement Modes pH, mV, relative mV (RmV) or ORP with temperature
Outputs USB, RS-232
Range (mV) ±2000.0 mV
Range (pH) -2 to 20
Resolution (pH) 0.1/0.01/0.001
Temperature Range (Metric) -5.0°C to +105.0°C
Includes Star A221 pH meter, 4 AA batteries, computer cable
Inputs BNC (pH or ORP electrode), pin-tip (reference electrode), 8 pin MiniDIN (ATC temperature probe)
Isopotential Point 7.000pH
Keypad Comprehensive with menu-specific function keys and dual purpose scroll/shortcut keys
Languages English, Spanish, French, Italian, German and Chinese; Portuguese and Korean available with software update
Log Function Type Automatic data logging with Auto-Read measure mode; manual data logging with Continuous measure mode
Memory Non-volatile memory preserves data log, calibration log and meter settings
Methods 10 per channel with password protection
Model Orion Star A221 pH/mV/RmV/ORP/Temperature Portable Meter
Power Supply Universal AC adapter (included) or 4 AA batteries (sold separately)
Probe Type pH electrode, ORP electrode, reference half-cell electrode, ATC temperature probe (purchase separately)
Range (ORP) ±2000.0 mV
Range (Relative mV) ±2000.0 mV
Relative Humidity Range 5 to 85%, non-condensing
Resolution (mV) 0.1mV
Stability Smart Stability and Smart Averaging
Temperature Accuracy ±0.1°C
Temperature (English) Operating 41°F to 113°F (ambient)
Temperature (Metric) Operating 5°C to 45°C (ambient)
Temperature Probe Calibration 1 point temperature offset calibration
Temperature Range (English) 22.0°F to 221.0° F
Temperature Resolution 0.1°C, 0.1°F
Temperature Selection Manual or automatic with ATC temperature probe
Warranty 3 Year Meter
Dimensions (L x W x H) 24cm x 10cm x 6.5cm (9.5 in. x 3.9 in. x 2.6 in.)
Weight (English) 1.2 lb.
Weight (Metric) 0.5 kg
Unit Size Each


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