550A Dissolved Oxygen Instrument

550A Dissolved Oxygen Instrument

YSI model 550A Dissolved Oxygen Meter.

Price$875.00 (US Only)

Option

SKU550A-12


In Stock 5

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The 550A dissolved oxygen instrument will be discontinued on December 23, 2016. YSI will continue to support existing 550A's for the next 5 years. The Pro20i handheld instrument is a suitable replacement.

Looking for a rugged, field-worthy instrument for measuring dissolved oxygen? The YSI 550A dissolved oxygen meter features a waterproof IP-67, impact-resistant case and innovative field-replaceable DO electrode modules.

Instrument, cables, probes/sensors included. Replaceable electrodes sold separately. 

Free Carrying Case with purchase of a 550A!  Add a 550A and 655100 to your cart and use discount code - 550ACase at checkout!

  • Overview

    Measure temperature and dissolved oxygen simultaneously using highly accurate thermistors and YSI's proven polarographic technology for dissolved oxygen. The fastest DO response times on the market using the Polyethylene (PE) Membrane.

    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.

    Screw-on cap membranes make membrane changes easier than ever. The PE membranes are also faster responding and require far less flow dependence. 

    The replaceable electrode decreases any down time due to old or damaged electrodes. Simply unscrew the old electrode, replace it with a new one, and calibrate! No need to send it in or to replace the whole cable assembly. The cables are now even stronger!

    Instrument, cable, probe, and 5908 cap membrane kit included. Optional carrying case available. If you're interested in dissolved oxygen measurements please take a look at our NEW Professional Series products Pro20 or optical DO handheld ProODO.

    Features:

    • Field-replaceable DO electrode modules
    • Screw-on cap membranes
    • IP-67 case
    • Over 2000 hours battery life
    • Calibrate in either mg/L or % saturation

    Please visit our extensive dissolved oxygen resource page to learn about all things DO and BOD related.

    You can also download The Dissolved Oxygen Handbook - the definitive guide on all things DO.

  • Specifications
    Certifications High-impact resistance, CE, IP-67
    Graphic Display Graphic
    Measurement Range Dissolved Oxygen-0 to 500% air saturation/0 to 50 mg/L, Temperature--5 to 45°C
    Multiparameter Yes
    Parameters Measured Dissolved Oxygen, Temperature
    Power Over 2000 hours at 25°C, Low battery indicator on display, 4 alkaline C-cells
    Sampling Yes
    Unit of Measure mg/L, Dissolved Oxygen-% air saturation, Temperature-°C
    User Calibratable Yes
    User Replaceable Yes
    Warranty 3-year instrument; 1-year DO module
    Waterproof IP-67 (even with the battery cover off), floats
  • Accessories

    Cap Membrane Kit 1.25 Mil PE

    Cap Membrane Kit 1.25 Mil PE (6 each), includes electrolyte (yellow cap)

    DO Replaceable Probe

    DO Replaceable Probe

    Probe Reconditioning Kit for 5239, Model 550A

    Probe Reconditioning Kit (400 grit sanding discs and sanding tool)

    Carrying Case, Small Soft-sided (instrument & cable)

    Carrying Case, Small Soft-sided (instrument & cable), Pre-cut foam/Nylon fabric (11.5 x 14.5 x 6)

  • How to Order

    Step 1: Order Instrument and Cable/Probe Assembly

    SKU Description
    550A-12, 25, 50 or 100 Instrument with 12, 25, 50 or 100-foot cable and probe
    550A-12CC, 25CC, 50CC, or 100CC Instrument with 12, 25, 50 or 100-foot cable and probe with carrying case

    Step 2: Order Accessories

    SKU Description
    5908 Membrane kit, 1.25 mil PE (6 caps and bottle of KCl)
    559 User-replaceable DO electrode
  • Video

    550A Dissolved Oxygen Instrument

    YSI model 550A Dissolved Oxygen Meter.

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