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A Story of Quality Assurance by W771-DOZ1.2MA2 in the Bottled Water Filling Industry

In bottled water production, "purity" is the lifeline. Every step, from water source treatment to filling and capping, requires strict control. Among these, the residual control in the ozone disinfection process is particularly critical—it must completely eliminate microorganisms in the water while preventing excessive ozone residues that could affect taste and safety. The W771 instrument from North Measurement & Control, paired with the Germany made OZ1.2MA2 ozone sensor, has become an "invisible guardian" for bottled water enterprises to protect quality with its precise monitoring and intelligent control capabilities.

Industry Pain Point: The Dilemma of Balancing Ozone Residues

The bottled water industry has strict standards for ozone usage: According to Packaged Drinking Water (GB 19298-2014), the ozone residual in finished water must be ≤ 0.05mg/L (i.e., 0.05ppm). Excess ozone can cause the water to have an irritating odor and even damage water quality stability; insufficient disinfection, on the other hand, may lead to excessive total bacterial count (standard requirement: ≤ 20CFU/mL), posing the risk of product recall.

In traditional production, ozone concentration monitoring relies on manual sampling and testing, which has two major drawbacks: First, lag—it takes more than 30 minutes from disinfection to the release of test results, during which unqualified water may have already entered the filling process. Second, insufficient accuracy—test strip methods or offline testing have large errors, making it difficult to capture subtle fluctuations at the 0.01ppm level, often resulting in the dilemma of "over-disinfection" or "insufficient disinfection."

Solution: The "Synergistic Combination" of W771-DOZ1.2MA2

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Targeting the precise monitoring needs of the bottled water industry, the monitoring system composed of the W771 instrument and OZ1.2MA2 ozone sensor provides full-process protection from "detection" to "control":

OZ1.2MA2: The "Sharp Eyes" for Capturing Subtle Ozone Changes

As a sensor specially designed for low-concentration ozone monitoring, the DOZ1.2MA2 has three major advantages:

High-Precision Capture: With a measurement range of 0.005~2.000ppm and a resolution of 0.001ppm, it accurately identifies the critical range of 0.03~0.05ppm, perfectly matching the bottled water residual standard.
Rapid Response: The T90 response time is only 15 seconds. When the disinfected water flows through the detection point, it instantly feeds back the ozone concentration, avoiding quality risks caused by lag.
Environmental Adaptability: It has a wide adaptability with a pH range of 2~11 and a water temperature range of 0~45℃, tolerating common water quality fluctuations in bottled water production. The membrane cap and electrolyte design support long-term stable operation, and replacement once a year meets maintenance needs.

W771 Instrument: The "Nerve Center" for Intelligent Control

The W771 instrument features humanized design and powerful functions, making monitoring and control more efficient:

Intuitive Control: The LCD screen displays ozone concentration and sensor working status in real-time, allowing production personnel to quickly judge water quality status without professional knowledge.
Flexible Adaptability: The measurement range can be freely set (e.g., setting the alarm threshold to 0.04ppm to reserve safety margin). Equipped with 4-20mA current output and RS485 communication, it can be easily connected to the workshop PLC system to realize remote data monitoring.
Proactive Early Warning: The high/low over-limit alarm function immediately triggers sound and light reminders when the ozone concentration approaches 0.05ppm. Three groups of relay control switches link with the ozone generator to automatically reduce the dosage and prevent exceeding the standard.
Simplified Operation & Maintenance: It supports multiple automatic electrode calibration methods, enabling calibration without stopping production. The adjustable hysteresis function reduces equipment wear caused by frequent start-stop and lowers maintenance costs.

Scenario Implementation: Full-Link Protection from Disinfection to Filling

In the application of a large bottled water enterprise, the W771-DOZ1.2MA2 system is deployed at two key nodes to build a quality defense line:

Water Monitoring After Disinfection

At the outlet of the ozone disinfection tower, the DOZ1.2MA2 monitors the ozone concentration in real-time. When the system detects that the concentration rises to 0.045ppm (preset upper limit), the W771 immediately triggers an alarm, and the relay reduces the power of the ozone generator. Within 30 seconds, the concentration is stabilized at 0.03~0.04ppm, ensuring the disinfection effect (total bacterial count is stably maintained at 5~10CFU/mL) while reserving a safety margin.

Final Detection Before Filling

In the buffer water tank before the filling line, the system conducts a secondary re-inspection. If the ozone concentration rises abnormally due to pipeline residues (e.g., a sudden rise to 0.055ppm), the RS485 signal of the W771 is immediately transmitted to the filling equipment, triggering shutdown protection to prevent unqualified water from entering the bottles. This reduces quality risks by 90% compared with traditional manual inspection.

Value Presentation: Making Every Bottle of Water Stand the Test of "Purity"

After applying the W771-DOZ1.2MA2 system, the enterprise has achieved three major improvements:

Compliance Upgrade: The qualification rate of ozone residues has increased from 95% to 100%. It has passed the unannounced inspections by market supervision departments three times in a row, with zero over-standard microbial indicators.
Quality Optimization: "Odor complaints" caused by excessive ozone have decreased by 80%, and consumer satisfaction has increased to 98%.
Efficiency Improvement: Automatic control reduces manual intervention, the ozone consumption per ton of water is reduced by 15%, the annual cost savings on consumables exceed 120,000 yuan, and equipment maintenance time is shortened by 60%.

In today's highly competitive bottled water industry, "purity" is not only a standard but also a reputation. With precise monitoring and intelligent control, the W771-DOZ1.2MA2 helps enterprises hold the quality bottom line, making every bottle of water carry "peace of mind" and "trust" and become an invisible business card to impress consumers.

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