YSI 550A: Dissolved oxygen meter
The YSI 550A dissolved oxygen meter features a waterproof, 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 Precision TM thermistors, the worldwide standard for accuracy. 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 meter has a built-in calibration chamber, low-battery indicator, and salinity and altitude compensation. The new PE membranes are standard with the 550A and provide greatly reduced stirring dependence and faster response times. Additional options with the 550A include 50 and 100' cables and measurement ranges up to 50 mg/L (500% saturation).
Features:
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Measures dissolved oxygen and temperature
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Field-replaceable DO electrode
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Easy-to-use, screw-on PE cap membranes
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Over 2000 hours of battery life
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Calibrate in either mg/L or % saturation
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User-selectable temperature units (°C or °F)
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Meets IP-67 water tightness requirements, submersible to 3 feet
For complete specifications view the YSI 550 Specification Sheet in PDF format (10.4 KB).
YSI 550A Dissolved Oxygen Specifications
| 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 |
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20-50 mg/L; + 6% of reading |
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0-200 %; + 2% air saturation or + 2% of reading, whichever is greater |
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200-500%; + 6% of reading |
| Range: |
0-50 mg/L |
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0-500 % air saturation |
|
-5 °to +45° C temperature |
| Resolution: |
0.01mg/L or 0.1 mg/L, user selectable |
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0.1% air saturation or 1%, user selectable |
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0.1 °C temperature |
| Temperature Units: |
Celsius or Fahrenheit, user selectable |
| Temperature Specifications: |
Accuracy: + 0.3 °C |
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Range: -5 °to +45° C |
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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 |
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High impact resistance |
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Push-button calibration |
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Built-in calibration chamber |
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Large, backlit display |
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Low battery indicator on display |
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CE compliance |
| Warranty: |
3-year for the instrument |
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1-year for the DO module |
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