How to Choose the Measurement Range of Online Ozone Detector?

The range of an online ozone monitor directly determines the accuracy of monitoring data, the device's lifespan, and its adaptability to specific scenarios. If the range is too large, low ozone concentrations may not reach the device's detection threshold, leading to data distortion. If the range is too small, high ozone concentrations may exceed the device's upper measurement limit, resulting in not only an inability to read the reading but also possible sensor damage. Zetron Technology recommends a comprehensive selection process based on three key factors: actual scenario requirements, industry standards, and device performance characteristics. The following is a detailed selection guide:

I. Clarify Two Key Prerequisites

Don't Blindly Pursue a Large Range: Some users believe that a larger range for an online ozone monitor is more versatile. However, devices with large ranges have lower low-concentration resolution. If used for low-concentration monitoring in scenarios like indoor air or laboratories, this can result in significant data errors, rendering the monitoring useless.

Don't Ignore Peak Concentrations: Consider both the typical and peak ozone concentrations in the scenario. For example, concentrations spike during the initial startup of disinfection equipment or during the initial stages of a pipeline leak. The range should cover 1.2-1.5 times the peak concentration to avoid peak values exceeding the range, which could overload the device, damage the sensor, or trigger false alarms.

II. Five Typical Scenarios

Online ozone detectors have widely varying applications across different industries, resulting in significantly different concentration ranges, necessitating targeted selection.

1. Indoor Air/Public Space Disinfection

In these scenarios, online ozone detectors are primarily used for air disinfection. They must comply with the "Indoor Air Quality Standard," which requires controlling residual concentrations within a safe range after disinfection. The measuring range must monitor both the concentration during disinfection and the residual concentration after disinfection to avoid inaccurate identification of low-concentration residual data due to a wide range. Recommended ranges: 0-1ppm or 0-5ppm.

2. Food/Pharmaceutical Workshop Disinfection

Online ozone detectors used in food and pharmaceutical factories must comply with industry standards such as GMP. They must ensure uniform disinfection concentrations meet standards and monitor residual concentrations after disinfection to prevent product contamination, requiring high accuracy. Recommended range: 0-5ppm.

3. Industrial Production Processes (e.g., Chemical Oxidation, Water Treatment)

In chemical oxidation reactions and industrial wastewater treatment, ozone is used as an auxiliary process. Its concentration fluctuates with process parameters. The measurement range should be determined by multiplying the process peak concentration by 1.2 to avoid process parameter loss due to insufficient measurement range, which could affect production efficiency. Recommended range: 0-20ppm or 0-50ppm.

4. Ambient Air Monitoring (Outdoor/Industrial Parks)

Online ozone detectors for outdoor or industrial parks primarily monitor ambient background concentrations. The core requirement is to capture minute concentration changes to meet environmental quality assessment requirements. Select low-range, high-resolution equipment to avoid wide ranges that reduce sensitivity and affect the accuracy of environmental monitoring data. Recommended range: 0-1ppm (low-range, high-precision model). 5. Ozone Generator Exhaust Treatment Scenario

Ozone generator exhaust gas concentrations are high, and if the exhaust treatment system malfunctions, the concentration could rise sharply, posing a safety risk. The measurement range must cover both typical exhaust gas concentrations and sudden leak peaks. Furthermore, the equipment must be explosion-proof to prevent damage or accidents caused by high exhaust gas concentrations. Recommended ranges: 0-100ppm or 0-200ppm.

Note: The above ranges are recommended; specific customization recommendations are subject to actual investigation by the online ozone detector manufacturer.

III. Commonly Overlooked Selection Details

When selecting an online ozone detector, the compatibility of sensor type and range is crucial. Electrochemical sensors, due to their high precision, are suitable for low-range applications such as indoor disinfection and environmental monitoring. However, long-term exposure to high ozone concentrations can cause "poisoning," shortening their lifespan. UV absorption sensors, on the other hand, are more suitable for medium- to high-range applications such as industrial processes and exhaust gas treatment. Their high-concentration shock resistance, long lifespan, and strong stability make them outstanding in this field. Furthermore, considering the possibility of future production process adjustments or expanded monitoring scenarios, to avoid the increased costs associated with repeated purchases due to fixed ranges, it is recommended to prioritize equipment that supports range customization or module upgrades, leaving room for range expansion in advance and preparing for future changes.

In short, selecting the range of an online ozone monitor requires a comprehensive assessment based on scenario requirements, industry standards, and device characteristics. First, determine the scenario concentration fluctuation range. Then, based on industry standards, clarify accuracy and safety requirements, and select the appropriate sensor and scalability. If there are concerns about concentration determination or device parameters during selection, it is recommended to consult the manufacturer for a customized solution that meets current monitoring needs and adapts to future changes, truly achieving one-time selection and long-term adaptability.