True Field Performance
Looking for a rugged, field-worthy instrument for measuring dissolved oxygen? The new YSI 550A DO features a waterproof IP-67, impact-resistant case and innovative field-replaceable DO electrode modules. Measure dissolved oxygen and temperature simultaneously using YSI’s proven polarographic technology for oxygen and YSI Temperature Precision TM thermistors, the worldwide standard for accuracy.
Packed With Features
Measurements are fast and easy with one-hand operation, an easy-to-use backlit display, automatic push-button calibration, and a weighted, quick-sinking probe. The YSI 550A DO has a built-in calibration chamber, low-battery indicator, direct salinity, and altitude compensation. The instrument provides simultaneous readings of oxygen and temperature. Dissolved oxygen readings are automatically compensated for temperature.
Medium: | Fresh, sea or polluted water |
Dissolved Oxygen Sensor: | Steady-State Polarographic |
Dissolved Oxygen Probe: | Field-replaceable module |
Accuracy: | 0-20 mg/L; +0.3 mg/L or +2% of reading, whichever is greater |
20-50 mg/L; +6% of reading | |
0-200 %; +2% air saturation or +2% of reading, whichever is greater | |
200-500%; +6% of reading | |
Range: | 0-50 mg/L |
0-500 % air saturation | |
-5°to +45° C temperature | |
Resolution: | 0.01mg/L or 0.1 mg/L, user selectable |
0.1% air saturation or 1%, user selectable | |
0.1°C temperature | |
Temperature Units: | Celsius or Fahrenheit, user selectable |
Temperature Specifications: | Accuracy: +0.3°C |
Range:-5°to +45° C | |
Resolution: 0.1°C | |
Altitude Compensation: | Yes |
Salinity Compensation: | Automatic (0-70 ppt) |
Temperature Compensation: | Automatic |
Power: | 4 alkaline C-cells |
Size: | 4.7 in. width; 9 in. length (11.9 cm x 22.9 cm) |
Weight with Batteries: | 2 lb. (0.91 kg) |
Battery life: | Over 2000 hours at 25°C |
Cables: | 12, 25, 50, or 100-foot lengths |
Other Features: | Waterproof to IP-67 |
High impact resistance | |
Push-button calibration | |
Built-in calibration chamber | |
Large, backlit display | |
Low battery indicator on display | |
CE compliance | |
Warranty: | 3-year for the instrument |
1-year for the DO module |
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