YSI 550A Portable Dissolved Oxygen Meter User Manual

About this manual

The YSI 550A is a portable dissolved oxygen instrument powered by four No. 3 alkaline batteries, offering approximately 2000 hours of operation on a full set. The device features a waterproof housing that should not be opened by unauthorized personnel to maintain the factory seal. It includes a convenient calibration/storage chamber with a sponge for creating a 100% water-saturated air environment for probe storage and calibration. This manual is written in Chinese.

What's inside

• Battery
• Calibration/Storage Chamber
• Hand Strap
• Working Principle
• Probe Preparation
• Film Maintenance
• Dissolved Oxygen Calibration
• Probe Operation
• Sensor Maintenance
• Replacing Dissolved Oxygen Electrode

Frequently asked questions

How long does a new set of alkaline batteries last in the YSI 550A?

A new set of alkaline batteries can power the instrument for approximately 2000 hours.

What is the required stirring speed when calibrating the YSI 550A in mg/L mode?

The probe must be stirred or agitated in the sample at a frequency of at least 1/2 foot per second.

How often should the membrane be replaced under normal conditions?

The average replacement cycle for the membrane is 4 to 8 weeks.