550A Dissolved Oxygen Instrument

YSI model 550A Dissolved Oxygen Meter.

PriceDiscontinued

Option

SKU550A-12

The 550A dissolved oxygen instrument has been discontinued. YSI will continue to support existing 550A's through 2020. We recommend the Pro20i as a direct replacement. The Pro20 and ProSolo handheld instruments are also suitable replacements.

Overview
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
Do you have an old meter such as the 550A that you'd like to trade in for a discount on a new ProSolo ODO/T system? Check out the Pro Series Trade-In Promotion going on now (U.S. only).

Be the envy of your co-workers by winning a ProSolo ODO/T system! Enter to win a ProSolo optical DO system.

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, IP-67, CE
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	Low battery indicator on display, Over 2000 hours at 25°C, 4 alkaline C-cells
Sampling	Yes
Unit of Measure	Dissolved Oxygen-% air saturation, Temperature-°C, mg/L
User Calibratable	Yes
User Replaceable	Yes
Warranty	3-year instrument; 1-year DO module
Waterproof	floats, IP-67 (even with the battery cover off)

Accessories

Cap Membrane Kit 1.25 Mil PE

Cap Membrane Kit 1.25 Mil PE (6 each), Polarographic, 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)

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