Overview :
The DO-66 Portable Dissolved Oxygen Analyser (hereinafter referred to as the instrument) is designed to be
portable to the user for on-site operation. The instrument can be divided into two parts: the sensor and the
electronic unit. The sensor uses a thin-film dissolved oxygen electrode. The electronic unit is an integrated
op-amp + microcomputer chip with automatic temperature compensation.

·The instrument is compact and lightweight.
·The self-contained carrying case makes it easy to carry and store instruments. The suitcase is made of PP
plastic, which is tough, impact resistant and durable.
Power durability
·Two AAA batteries (2*1.5V) provide a longer-lasting power and up to approx. 600 hours of continuous use.
·The instrument is more user-friendly with a low voltage alert. An alert appears on the screen when the
battery is about to run out to remind the user to pay attention to the power level and replace the battery in
3time.
Waterproof
·The entire body is waterproof except for the battery compartment, which better protects the internal
circuitry.
Automatic calibration
·A two-point automatic calibration button for "0%" and "100%" makes calibration easy.
automatic temperature compensation (ATC )
·Automatically recognises and converts the values corresponding to the difference between the actual
solution temperature and the standard temperature, ensuring more accurate measurement results.

3.2 Calibration
*The instrument is calibrated using a two-point calibration method: one with "0%" oxygen-free water and
one with "100%" saturated dissolved oxygen water.
Supplies: one cup of oxygen-free water, one cup of saturated dissolved oxygen water, magnetic stirrer
(See 3.1.2 for preparation of oxygen-free water and saturated dissolved oxygen water; a magnetic mixer is
preferable, otherwise manual mixing is used.)
1."0%"calibration (zero calibration for oxygen-free water)
1)Clean the electrode in deionised or distilled water and wipe the water from the electrode.
2)Press“ ”to switch on the machine. Place the anaerobic water on a magnetic mixer (or agitate it
manually) and gently agitate the solution continuously, immersing the electrode in the zero-oxygen solution
for at least 3 minutes until the displayed value is stable.
3)Press and hold the " " button for 5 seconds and the word ""CAL"" will appear on the screen, entering
the calibration mode. Continue to gently shake the electrode, and when the displayed value is stable, press
the " " button, the DO value will be displayed at 0% and the word "CAL" will disappear, completing
the zero calibration.
2."100%"calibration. (Percentage correction of saturated dissolved oxygen water)
9
1) After completing the "0%" point calibration, clean the electrode in deionised or distilled water and dry
the electrode.
2) Place the dissolved oxygen water on the magnetic stirrer and stir continuously.
3) Press and hold the " " button for 5 seconds, the word ""CAL"" will appear on the screen and you
are in calibration mode. Immerse the electrode in dissolved oxygen water and continue to shake the
electrode gently (keeping the water continuously stirring), when the displayed value is stable, press the
" " button

Shenzhen Yieryi Technology Co., Ltd Company Profile

Company Overview

Shenzhen Yieryi Technology Co., Ltd was established in 2012 and is located in the Economic Development Zone of Shenzhen City, Guangdong Province. Leveraging our superior geographic location, convenient transportation facilities, outstanding research and development capabilities, exquisite craftsmanship, and comprehensive testing equipment, we are dedicated to providing high-quality measurement instruments and solutions to customers worldwide.

Our Products

As a professional manufacturer of measurement instruments, Shenzhen Yieryi Technology Co., Ltd primarily produces the following products:

· Portable and Digital Refractometers

· Pen-Type and Online Monitoring pH Meters

· DO Meters, TDS Meters, ORP Meters, EC Water Quality Testers

· Soil Testers

· Temperature and Humidity Meters

Our products are widely used in various fields, including beer brewing, liquor production, sugar manufacturing, fruit juice processing, agriculture, aquarium maintenance, hydroponics, environmental protection, food safety, education, military, and technology, catering to the diverse needs of different industries.

Why Choose Shenzhen Yieryi Technology Co., Ltd

Choosing Shenzhen Yieryi Technology Co., Ltd means you will enjoy the following unique advantages:

1. Excellence in Product Quality

· Strict Quality Control: All our products are certified under the ISO9001:2008 quality management system and possess ROHS, CE, and FCC certifications. Some products also hold design patents. Every product undergoes rigorous testing and calibration before leaving the factory to ensure high precision and reliability.

· High-Quality Materials and Craftsmanship: Located in Shenzhen’s Economic Development Zone, we are equipped with advanced manufacturing facilities and an experienced craftsmanship team, ensuring that each product boasts superior durability and performance.

2. Comprehensive Product Line

· Diverse Measurement Instruments: We specialize in manufacturing a wide range of products, including portable and digital refractometers, pen-type and online monitoring pH meters, TDS meters, ORP meters, EC testers, DO meters, soil pH and temperature & humidity meters, among others, to meet the diverse needs of various industries.

· Wide Application Fields: Our products are extensively used in beer brewing, liquor production, sugar manufacturing, fruit juice processing, agriculture, aquarium maintenance, hydroponics, environmental protection, food safety, education, military, and technology sectors, ensuring that you can find suitable solutions across different industries.

3. Technological Innovation and R&D

· Strong R&D Team: We boast a professional technical research and development team that continuously pursues technological innovation. We collaborate with multiple research institutions to develop new products, ensuring that our offerings remain at the forefront of the industry.

· Patent Protection: Some of our products feature unique designs and functionalities protected by design patents, enhancing their competitiveness and market uniqueness.

4. High-Quality Customer Service

· Professional Customer Support: Our customer service team is dedicated to providing timely and effective support, ensuring that you have peace of mind during the entire usage process.

· Personalized Solutions: We offer customized products and services tailored to the specific needs of our clients, accommodating various special requirements.

· Global Logistics Network: With a well-established global distribution system, we ensure that our products are delivered quickly and safely to customers around the world.

5. Reliable Market Reputation

· Stable Global Market Presence: Since starting our export business in 2013, our products have been successfully exported to Europe, America, Southeast Asia, and the Middle East, achieving an annual sales volume of USD 5-10 million. We have earned the trust and praise of customers worldwide.

· Brand Influence: Our brand “YIERYI,” registered in 2016, has consistently focused on the theme of health. With a design that is simple, stylish, and portable, we are committed to bringing health concepts into every home and every corner of the world.

6. Sustained Corporate Spirit

· Unity, Diligence, Exploration, and Innovation: We firmly adhere to the corporate spirit of “Unity, Diligence, Exploration, and Innovation,” continuously striving for excellence, exceeding customer expectations, and building long-term partnerships.

Our Vision

Shenzhen Yieryi Technology Co., Ltd is committed to driving business growth and success for our clients through continuous innovation and exceptional service. We aim to establish the “YIERYI” brand as a globally recognized health technology brand, promoting health concepts into every home and every corner of the world.

Conclusion

By choosing Shenzhen Yieryi Technology Co., Ltd, you will receive high-quality products, advanced technical support, comprehensive customer service, and a reliable partnership. Let’s work together to create a prosperous future and move towards a more prosperous and sustainable tomorrow!