YSI 550A oxygen meter

YSI 550A Instrument General Specifications

Cables	12, 25, 50, or 100- foot lengths
Calibration	Push-button, built-in calibration chamber
Certifications	CE, IP-67, High-impact resistance
Dimensions	11.9 cm width x 22.9 cm length (4.7 in x 9 in)
Display	Large, backlit
Medium	Fresh, sea, or polluted water
Parameter Compensation	Automatic temperature compensation for dissolved oxygen Automatic salinity compensation with manual salinity input from 0-70 ppt for dissolved oxygen Altitude compensation for calibration
Power	4 alkaline C-cells; Over 2000 hours at 25°C; Low battery indicator on display
Warranty	3-year instrument; 1-year DO module
Weight with Batteries	0.91 kg (2 lbs)

YSI 550A System Specifications (Instrument with Cable & Probe)

	Sensor Type	Range	Accuracy	Resolution
Dissolved Oxygen (%)	Steady-state Polarographic	0 to 500% air saturation	0 to 200%: ±2% of reading or 2% air saturation, whichever is greater; 200 to 500%: ±6% of reading	0.1% air saturation or 1%; selectable
Dissolved Oxygen (mg/L)	Polarographic	0 to 50 mg/L	0 to 20 mg/L: ± 0.3 mg/L or 2% of reading, whichever is greater; 20 to 50 mg/L: ±6% of reading	0.01 mg/L or 0.1 mg/L; selectable
Temperature	Thermistor	-5 to 45°C	±0.3°C	0.1°C