600OMS V2 Optical Monitoring Sonde

6-Series Legacy Sondes

View YSI 6-Series water quality sondes being used in a variety of water environments for long-term underwater monitoring and spot sampling.




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Single-Parameter, Low-Cost Optical Monitoring System

Measure optical dissolved oxygen, chlorophyll, blue-green algae, rhodamine, or turbidity in combination with temperature, conductivity and depth.

Instrument only. Cables, probes/sensors, and accessories sold separately.

  • Overview

     6-Series sondes are going away. Read about the discontinuation at  YSI.com/6-series
    Designed for use in fresh, sea or polluted waters, the 600OMS V2 utilizes the field-proven YSI sensors and incorporates innovations in sensor configuration such as a conductivity and temperature module that fits into the sonde body.

    Parameters available for the 600OMS V2 include:

    • Temperature
    • Conductivity
    • Salinity
    • Specific Conductance
    • Depth
    • TDS
    • Shallow Vented Level
    • Optical Dissolved Oxygen, Blue-green Algae, Turbidity, Chlorophyll or Rhodamine

    The 600OMS V2 is available with or without internal power. Its small size is perfect for applications such as turbidity or oxygen monitoring.


    • Fits down 2-inch wells
    • Easily connects to data collection platforms
    • Compatible with the YSI 650 MDS
    • Wiped optics prevent biofouling​

  • Specifications
    Certifications CE, FCC, Assembled in the USA, WEEE, and MCERTS, IP-67, EU Battery Compliance
    Connectivity / Communications RS-232, SDI-12
    Desktop Software Compatible EcoWatch®
    Medium Fresh, sea or polluted water
    Monitoring Yes
    Multiparameter Yes
    Operating Temperature -5 to +50°C
    Parameters Measured temperature/conductivity, dissolved oxygen, turbidity, chlorophyll, blue-green algae, rhodamine
    Power 25 to 30 days at 15 minute sampling interval at 25°C, 4 AA Alkaline cells
    Sampling Yes
    Storage Temperature -10 to +60°C
    User Calibratable Yes
    Waterproof IP-67
    General Sonde Specifications  
    Medium Fresh, sea or polluted water
    Temperature - Operating -5 to +50°C
    Temperature - Storage -10 to +60°C
    Communications RS-232, SDI-12
    Software EcoWatch®
    Diameter 1.65 in, 4.2 cm
    Length 21.3 in, 54.1 cm
    Weight 1.3 lbs, 0.6 kg
    Weight with Batteries 1.4 lbs, 0.7 kg
    Power - External 12 V DC
    Power - Internal (optional) 4 AA Alkaline cells, 25 to 30 days at 15 minute sampling interval at 25°C
    Certifications CE, EU Battery Compliance, FCC, IP-67, WEEE, and MCERTS; Assembled in the USA
    Sensor Specifications Range Resolution Accuracy
    Optical Dissolved Oxygen•
    % Saturation
    0 to 500% 0.1% 0 to 200%: ±1% of reading or 1% air saturation, whichever is greater;
    200 to 500%: ±15% of reading
    Optical Dissolved Oxygen•
    0 to 50 mg/L 0.01 mg/L 0 to 20 mg/L: ± 0.1 mg/L or 1% of reading, whichever is greater;
    20 to 50 mg/L: ±15% of reading
    Conductivity••​ 0 to 100 mS/cm 0.001 to 0.1 mS/cm
    (range dependent)
    ±0.5% of reading + 0.001 mS/cm
    Salinity 0 to 70 ppt 0.01 ppt ±1% of reading or 0.1 ppt,
    whichever is greater
    Temperature​ -5 to +50°C 0.01°C ±0.15°C
    Depth - Medium 0 to 200 ft, 61 m 0.001 ft, 0.001 m ±0.4 ft, ±0.12 m
    Depth - Shallow 0 to 30 ft, 9.1 m 0.001 ft, 0.001 m ±0.06 ft, ±0.02 m
    Vented Level 0 to 30 ft, 9.1 m 0.001 ft, 0.001 m ±0.01 ft, 0.003 m
    6136 Sensor‡
    0 to 1,000 NTU 0.1 NTU ±2% of reading or 0.3 NTU,
    whichever is greater**
    Rhodamine• 0-200 μg/L 0.1 μg/L ±5% reading or 1 μg/L,
    whichever is greater
    Blue-Green Algae Sensor Specifications Range Detection Limit Resolution Linearity
    Blue-Green Algae
    ~0 to 280,000 cells/mL†
    0 to 100 RFU
    ~220 cells/mL§ 1 cell/mL
    0.1 RFU
    R2 > 0.9999**
    Blue-Green Algae
    ~0 to 200,000 cells/mL†
    0 to 100 RFU
    ~450 cells/mL§§ 1 cell/mL
    0.1 RFU
    R2 > 0.9999***
    6025 Sensor‡​
    ~0 to 400 μg/L
    0 to 100 RFU
    ~0.1 μg/L§§§ 0.1 μg/L Chl
    0.1% RFU
    R2 > 0.9999****

    • Maximum depth rating for optical probes is 200 feet, 61 m. Turbidity, Rhodamine, Blue-Green Algae (PC & PE) and Chlorophyll are available in a Deep Depth option (0 to 200 m). Anti-fouling optical probes have depth rating of 200 m.
    •• Report outputs of specific conductance (conductivity corrected to 25° C), resistivity, and total dissolved solids are also provided. These values are automatically calculated from conductivity according to algorithms found in Standard Methods for the Examination of Water and Wastewater (ed 1989).

    *In YSI AMCO-AEPA Polymer Standards.
    **For serial dilution of Rhodamine WT (0-400 ug/L).
    ***For serial dilution of Rhodamine WT (0-8 μg/L).
    ****For serial dilution of Rhodamine WT (0-500 ug/L).

    RFU = Relative Fluorescence Units ​
    † Explanation of Ranges can be found in the ‘Principles of Operation’ section of the 6-Series Manual, Rev D.
    ‡​ Sensors with listed with ETV logo were submitted to the U.S. EPA ETV program on the YSI 6600EDS. Information on performance characteristics of YSI water quality sensors can be found at www.epa.gov/etv, or call YSI at 800.897.4151 800.897.4151 for the ETV verification report. Use of ETV name or logo does not imply approval or certification of this product nor does it make any explicit or implied warranties or guarantees as to product performance. 

    § Estimated from cultures of Microcystis aeruginosa.
    §§ Estimated from cultures Synechococcus sp.
    §§§ Determined from cultures of Isochrysis sp. and chlorophyll a concentration determined via extractions. 

    Specifications indicate typical performance and are subject to change.

  • Reviews
    Write a review

    Javier Rodriguez10/13/2016

    Good day. I'm writing to you for consultation by the value of V2 600OMS Optical Monitoring Sonde and MDS 650 Multi-Parameter Display System. I have thought to use this equipment for monitoring a small streams in Santa Marta - Colombia, so I consulted you, if I must purchase other accessories to make basic measurements with this sonde. Thank you very much for your advice. Javier Rodríguez.


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