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Portable Dissolved Oxygen Meter with Data Memory | 8403 AZ - AZ Instrument Corp.

We ensure that our Dissolved Oxygen Meter goes through different quality tests to maintain the desired quality standards for our offerings. Alongside innovation, we maintain a great variety of essentials too, tried and tested by our loyal customers. Let AZ Instrument Corp. build the highest performance Dissolved Oxygen Meter for your applications. We can promise that whatever your Dissolved Oxygen Meter problem is, we will find a way to solve it to your satisfaction. If you have any questions regarding any of the services we offer, please don't hesitate to inform us. We look forward to being of service to you.
AZ 8403 handheld dissolved oxygen meter with digital display and probe for precise water quality testing.

8403 AZ EB

Dissolved Oxygen Meter

Welcome to check the Features, Application, Specification, YouTube of 8403 AZ Handheld Digital Dissolved Oxygen Meter with Memory Function as follows
Features :

The AZ 8403 Dissolved Oxygen Meter is developed under high-quality manufacturing processes to ensure reliability and safety:
ISO 9001 Facility: Manufactured in an ISO 9001 certified environment.
CE EN 61326-1 & IEC 61000: Designed and tested to meet European EMC safety standards.
RoHS & REACH Compliant: We provide a Manufacturer’s Self Declaration, ensuring the product meets environmental safety standards for hazardous substances.

8403 AZ Dissolved Oxygen Device features:
* Big LCD with D.O. & Temperature value display and stability indicator
* Easy 100% Dissolved Oxygen Value calibration
* Dissolved oxygen sensor is the most cost effective Clark type electrode
* 8403 DO probe does not need refill electrolyte often as galvanic electrode
* Accurate dissolved oxygen measurement
* Manually salinity and barometric pressure compensation
* Stores and recalls 99 data with temperature readings
* Real time clock for each memory data
* USB interface + IrDA interface

Application :

Application of 8403 AZ Dissolved Oxygen Detector:
The portable 8403 AZ DO meter can measure the value of Dissolved Oxygen with unit of % or ppm or mg/l in liquid, which had been widely operation in the Water Quality Testing applications. It has the big LCD which can display the D.O. (Dissolved Oxygen) value and the temperature.

The salinity and barometric pressure could affect the DO measuring accuracy, and that could be adjustable in 8403 AZ Digital DO Device, which could help user to get the accurate Dissolved Oxygen value.

The 8403 AZ Digital DO Device can calibrate easily in the ventilation environment, welcome to refer the DO calibration procedure video from the following YouTube link.

The measuring Dissolved Oxygen data could transmit to the 9680 IrDA Printer to printout. The 8403 AZ Dissolved Oxygen Meter could link to PC via USB cable to capture the on-line data, and display the Dissolved Oxygen readings with real-time output. User can retrieve file, save the data for operating data analysis, record statistics....versatile functions according different purposes.

The 8403 AZ Digital DO Device could be the best Water Quality tester for all professional measuring purposes, including the LAB, water treatment business, Aquaculture, Aqua farm, swimming pool or other related industry.

The 8403 AZ Dissolved Oxygen Detector was being designed and manufactured by AZ Instrument, a well experienced manufacturer for Environmental Measuring Instrument.

Specification :

Specification of 8403 AZ Dissolved Oxygen Meter:

Model 8403
DO Measuring Range 0~199.9 (in %)
DO Accuracy ±1.5% F.S (in %)
DO Resolution 0.1% (in %)
DO Measuring Range 0~19.99 (in ppm or mg/l)
DO Accuracy ±1.5% F.S (in ppm or mg/l)
DO Resolution 0.01 (in ppm or mg/l)
Temperature Measuring Range 0~50.0℃
Temperature Accuracy ±0.3℃
Temperature Resolution 0.1℃
Manual Compensation Included
Salinity Adjustable Range 0.0~50.0 ppt
Salinity Resolution 0.1 ppt
Barometric Pressure Adjustable Range 500~1499 mmHg/66.6~199.9 Kpa
Barometric Pressure Resolution 1 mmHg/0.1 Kpa
Coefficient of membrane Adjustable
Memory 99 Points
IrDA Port Included
Real Time/Recall Included
LCD Size 44(L)*26 (W) mm
Operating Temperature 0~50℃
Operating RH% Humidity <80%
Storage Temperature 0~60℃
Storage RH% Humidity <90%
Sensor Life Time >6 months (with good maintenance)
Meter Size 175(L) * 70(W) * 33(H) mm
Weight ~150g
Battery AAA *4 PCS
Standard Package Meter, Batteries, Dissolve Oxygen (D.O.) Probe (840PAZ),
Manual, Carry Case, Electrolyte, Syringe, Membrane, O-ring
Optional Accessory USB Cable & Software

Youtube :

Welcome to learn more about the 8403 AZ Handheld DO Meter Calibration Procedure from the following YouTube video.


8403 AZ DO Probe Maintenance Procedure Video

AZ 8403 DO Meter Unboxing Video

FAQ :

【FAQ of AZ 8403 Handheld Dissolved Oxygen Meter with Memory】


Q1: How often should I calibrate the AZ 8403?
A: For optimal accuracy, calibrate before each use or daily. You should also recalibrate after replacing the membrane or when there are significant changes in temperature or altitude.

Q2: When should I replace the DO probe membrane and electrolyte?
A: Replace them if you notice unstable readings, slow response, or difficulty calibrating. Regular maintenance is recommended every 3–6 months, or immediately if the membrane is torn, fouled, or dry.

Q3: Can I use the AZ 8403 for BOD testing?
A: Yes. But please notice that while the AZ 8403 provides high-accuracy DO readings, it does not have a built-in BOD calculation mode. Users must design their own testing protocol to manually calculate the BOD value based on the results.

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AZ Instrument Corp., is one of the most reputable Dissolved Oxygen Meter manufacturer in Taiwan and the Asia Pacific region. We use high grade quality raw materials for processing our Dissolved Oxygen Meter. We also customize these products in various dimensions as per the client's specified requirement and detail. Providing the end user with supply quality Dissolved Oxygen Meter. We have always been committed to reaching new heights in innovation, leadership and customer satisfaction. When you submit a request from this page, our best expert will respond to your question in a timely manner.