YSI Professional Series Pro20i Dissolved Oxygen Instrument

Accuracy and Durability in the Field: YSI Pro20i Dissolved Oxygen Meter

With a rugged design, interchangeable sensors, and instant calibration, the YSI Pro20i is the ideal tool for reliable dissolved oxygen measurements in demanding conditions.

The YSI Pro20i is a portable meter for dissolved oxygen (DO) and temperature, designed to deliver accurate field measurements with a durable and easy-to-use interface. Unlike other models, the Pro20i features an integral (non-detachable) cable available in 1, 4, and 10 meter lengths. Users can choose between polarographic or galvanic DO sensors, both of which are user-replaceable, to meet various measurement needs. Its rubber over-molded housing, military-spec connectors, and backlit display make it ideal even in harsh environments.

Key Features:

• One-step calibration: One Touch Cal function allows calibration in under 3 seconds.
• Integrated cable: Available in 1, 4, and 10-meter lengths, with interchangeable DO sensors.
• Built for the field: Waterproof (IP-67), drop-tested from 1 meter, with a non-slip rubber casing.
• Interchangeable sensors: Choice of polarographic (1-year warranty) or galvanic (6-month warranty) sensors.
• Internal barometer: Ensures greater DO measurement accuracy.
• Fast response: 95% response time in just 8 seconds with standard membrane.
• Outdoor-readable display: Graphic backlit display and glow-in-the-dark keypad, readable even with polarized sunglasses.
• Internal memory: Stores up to 50 data sets to ensure data integrity.
• Multilingual interface: Available in English, Spanish, French, and German.
• Long battery life: Up to 400 hours of operation with 2 C-cell batteries (without backlight).

• Specifications
• In the Box
• Required Items
• Optional Items
• Documents

• Parameter	Detail
  Cable	Integrated, available in 1, 4, and 10 meters
  Compatible Sensors	Polarographic (1-year warranty) / Galvanic (6-month warranty)
  Calibration	One Touch Cal (fast, in 3 seconds)
  Memory	50 data sets
  User Interface Language	English, Spanish, French, German
  Display	Graphic, backlit, visible with polarized sunglasses
  Power Supply	2 alkaline C-cell batteries (~400 h without backlight)
  Certifications	RoHS, CE, WEEE, IP-67, 1-meter drop test
  Response Time	95% in 8 seconds

• • YSI Pro20i with integrated cable
  • Dissolved oxygen sensor with membrane cap kit
  • User manual
  • 2 C-cell batteries
• • Dissolved oxygen calibration solution (optional for best results)
  • Appropriate environmental conditions for field use
• • Additional galvanic or polarographic sensor
  • Membrane maintenance kit
  • Padded carrying case
• • Specification Sheets
  • User Manual
  • Technical Notes