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Hobo W-DO Dissolved Oxygen Sensor

The conductivity sensor is an interchangeable accessory designed for use with the HOBO MX800 Series Water Loggers, enabling them to measure conductivity and temperature. When connected to a HOBO MX800 Series Water Logger, this sensor also allows the device to calculate specific conductance, salinity, and total dissolved solids (TDS).

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The dissolved oxygen sensor is an interchangeable sensor that works with HOBO MX800 Series Water Loggers to measure dissolved oxygen and temperature.

The DO sensor can be attached directly to the fully submersible MX801 model, or attached via cable to the direct read MX802 model, which doesn’t require having to pull the sensor out of the water to download data.

When this sensor is connected to a HOBO MX800 logger that also has a conductivity or CTD sensor attached, the logger can record salinity-adjusted DO directly. With this sensor attached to the HOBO MX802 direct read model, the logger can calculate DO percent saturation directly. When used with fully submersible HOBO MX801 model, a barometric logger data file (from either an MX802 or MX2001 logger) is needed to calculate DO percent saturation, for post-processing in the HOBOconnect app. In waters with changing salinity, the logger must also have a salinity sensor attached or you will need an MX800 salinity data file to get DO percent saturation.

Features

User-replaceable DO cap lasts 2 years or more
High accuracy measurements, even without calibration
Get salinity-adjusted DO directly when used with conductivity sensor (W-CT or W-CTD), no need for post-processing
Direct DO percent saturation data, no need for post-processing (when used with MX802)
Easy calibration with included calibration boot – saves time
1” diameter for use in narrow wells (with cable to MX802 above the well)
PVC housing holds up in saltwater

Technical specifications

Dissolved Oxygen

Optical Sensor

(dynamic luminescence quenching)

Measurement Range

0 to 60 mg/L; 0-600% Saturation

Accuracy

Out-of-box: ±0.2 mg/L (typical) over the range of 0 to 20 mg/L

±4% over the range of 20 to 60 mg/L

With user calibration: ±0.1 mg/L over the range of 0 to 20 mg/L; ±2% over the range of 20 to 60 mg/L

Resolution

0.01 mg/L

Sensor Drift

Accuracy is maintained for 2 years; aside from the effects of fouling

Response Time

To 90% in less than 45 sec

DO Sensor Cap Life

2 years; after this the sensor will continue operate, but possibly with less accuracy

Temperature

Temperature Measurement/Operating Range

-5 to 50°C (23 to 104°F), non-freezing

Temperature Accuracy

0.15°C (0.27°F)

Temperature Resolution

0.01°C (0.04°F)

Response Time

To 90% in less than 15 minutes

Logging Rate

When using this sensor, the maximum logging rate is 1 min

Depth Rating

IP-68, waterproof to 100 m (328 ft) - must be attached to logger and have DO sensor cap installed

Wetted Materials

Black Delrin®, PVC, EPDM o-rings, rated for saltwater use

Size

To Be Determined

Jeroen Smits

Manager Product- en Sector Specialists

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Hobo W-DO Dissolved Oxygen Sensor

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Jeroen Smits

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