Dissolved Oxygen Probes

Photo of Thermo Scientific Orion Dissolved Oxygen Probe Maintenance Accessories

Thermo Scientific® Orion™ supplies kits and accessories necessary for maintaining your Orion DO Probe in top operating condition. Convenient Membrane Caps are available for all Orion Probes.

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Photo of Thermo Scientific Orion™ Dissolved Oxygen Probes for Field or Lab Use

These Thermo Scientific™ Orion™ DO Probes for Lab or Field are durable and accurate. They feature automatic temperature compensation and convenient screw-on membrane caps. All models have a 9 pin MiniDIN connector.

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Photo of DO Field Probe for YSI 50 Series Meters

YSI 50 Series Meters. YSI 5239 A rugged, field DO probe with easy-to-replace cap membranes, the YSI 5239 DO and temperature sensor is compatible with YSI 50 Series meters (except the YSI 55). Weighted and protected by a heavy-duty guard, the YSI 5239 is optimized for YSI microprocessor-based systems.

Photo of Membranes and Service Parts for YSI Oxygen Probes

YSI standard 1-mil membranes are perfect for most applications. If you're measuring below 15C or at low DO levels, use the high-sensitivity 0.5-mil PTFE membranes. To measure very high DO levels or for longer term monitoring, use the 2-mil membranes in the YSI 5685 membrane kit. They're less affected by biofouling and reduce DO sensitivity.