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    Portable Ozone (O3) Gas Detector, 0 to 10/20/50 ppm

    5 out of 5 based on 12 reviews | Write a review
    Portable Ozone gas detector, applied for the O3 gas detection with high accuracy and fast response, measuring range from 0 to 10ppm / 20ppm / 50ppm for options, real-time LCD display, give sound, light & vibrating alarm, small & light O3 detector at affordable price, handheld design, convenient to carry around.
    Availability: In stock
    Free Shipping Worldwide
    Delivery date: 2-12 days

    Portable O3 gas detector with alarm is suitable to monitor the Ozone concentration in range of 0 to 10/20/50/100ppm with high precision sensor and economical price.


    • LCD dot matrix display, direct readout of gas type, unit, concentration, local time, etc.
    • Support English/Chinese operation, easy to shift.
    • Gas concentration unit PPM and mg/m3 can be shift quickly.
    • Built-in micro-sampling pump, 10 grades of suction are available.
    • Explosion-proof certification

    Gas Detector Functions

    • With self-calibration and zero calibration functions, makes the detection more accurate and reliable.
    • One key to restore factory setting, free from maloperation.
    • With temperature and pressure compensation, able to realize the compensation for the gas concentration under different temperature and pressure environments.
    • Two-stage alarm with sound and light, and alarm point is settable.
    • Rechargeable lithiumpolymer battery with large capacity.
    • High-strength special engineering plastic housing, with anti-slip, waterproof, dustproof and explosion-proof.


    Model ATO-GAS-O3
    Sampling Method Pump suction type, flow rate can be up to 750ml/min
    Detection Principle Electrochemistry
    Gas Ozone (O3)
    Range (Optional) 0 to 1 ppm, 0 to 10 ppm, 0 to 20 ppm, 0 to 50 ppm, 0 to 100 ppm, 0 to 500 ppm, 0 to 1000 ppm
    Resolution 0.001 (0-1ppm), 0.01ppm (0-10/20/50/100ppm), 0.1ppm (0-500ppm), 1ppm (0-1000ppm)
    Accuracy ≤±3% F.S.
    Responce Time ≤10s
    Repeatability ≤±1%
    Recovery Time ≤10s
    Linearity Error ≤±1%
    Zero Shift ≤±1% (F.S./year)
    Data Logging (Optional Function) High speed data transmission by USB, available for data downloading and printing (The built-in IC card has about 2G memory, which can record 100,000 sets of data.)
    Alarms Sound, light and vibration
    Display LCD dot matrix display
    Language Chinese/English
    Battery 3.7V rechargeable lithium battery, 3.7 Watt
    (Charger included: Input AC 100-240V 50/60Hz with optional USA, Europe or UK plug)
    Operating Time 100h (Pump off)
    Communication Mini USB interface supports standard MODBUS communication protocol
    Explosion-proof Grade Ex ia llC T4 Gb
    Case Material ABS+PC
    Protection Grade IP66
    Certification CE, ATEX
    Operating Temperature -20℃~50℃
    Operating Humidity 0~95%RH (non-condensing)
    Operating Pressure 0.8~1.2bar
    Dimension 205*75*32mm
    Weight 300g
    Warranty 12 months

    * If you need a O3 gas detector with other measuring ranges unlisted in above table, please contact us to inform your operating environment, so as to help you choose an appropriate one for your application.
    * We also provide other common gas detectors, and you can refer to ATO Gas Detector Catalog to get the specific gas type and measurement range. If you have any questions, please feel free to contact us.


    Handheld Ozone gas detector is widely used for O3 gas measurement in the clean area, pharmaceutical factory, food factory, cosmetics factory, laboratory and so on.

    Ozone O3 Gas Detector Applications

    Tips: Use Case - Ozone (O3) Detector in Pharmaceutical Factory

    A pharmaceutical factory, specializing in research, production and sales of various chemical API, requires testing whether ozone disinfection in the workshop reaches the effect of sterilization.

    Separate sterilization is required in the workshop of pharmaceutical plant. Ozone generator with a certain concentration, which is selected according to the size of the room space, is directly installed in the room. And the disinfection time is also set as required. The ozone generator will automatically shut down after the disinfection finishes. Then, it need to check whether the room disinfection has achieved the effect. The pharmacy manager said that there is a hundred-level workshop, and about 20ppm ozone concentration can achieve the standard for disinfection. In additions, there are no workers in the room to monitor ozone levels during disinfection.

    According to the requirements of the manager of the pharmaceutical factory, the ozone concentration is not up to the standard until it reaches 20ppm. The ozone (O3) gas detector ATO-GAS-O3 is recommended, with measuring range of 0-50ppm and data storage and export functions. In this way, the ozone detector can be set the storage interval, such as 5 seconds to store a data. Before disinfection, put the detector in the disinfected room. After disinfection, take out the O3 detector and export the data to an Excel sheet in the computer via USB. Thus, the data can also be printed out for checking. This model of ozone gas detector has a sampling pump inside, which will draw the gas into the instrument for detection. The gas detector has fast response and high accuracy. Because ozone is toxic, it is better to choose pump suction type to avoid ozone poisoning.

    Basic Settings of Portable Gas Detector

    This video will show you the basic settings of ATO portable gas detectors including high/low alarm setting, language setting and time setting.

    Calibration of Portable Gas Detector

    This video will show how to calibrate the ATO portable gas detectors.

    Calibration of Fixed Type Gas Detector

    This video will show the calibration procedures of the ATO fixed type gas detectors.

    Existing reviews of Portable Ozone (O3) Gas Detector, 0 to 10/20/50 ppm
    Does your O3 gas detector come pre-calibrated?
    Does your O3 gas detector come pre-calibrated?
    From: Jack | Date: 27/06/2019
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, it is well calibrated before shipping.
    Charging time of portable ozone detector
    How long does it take to get your O3 gas detector to be fully charged?
    From: Ryan | Date: 11/11/2019
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Hi, Ryan. It takes about 5-6 hours for the O3 detector to be fully charged.
    Ozone gas detector internal pump
    For your ozone gas detector, does the internal pump work continuously? And what is the pump flow speed?
    From: Rahul | Date: 02/12/2019
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Hi, Rahul. As long as the gas detector is detecting, the pump must be on, and the flow speed of the pump is 700mg/min.
    Can you provide 1m long air hose?
    We shall buy your O3 gas detector, can you provide 1m long air hose?
    From: Stephen | Date: 26/04/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, we can provide 1m long air hose free of charge. Just remind us after ordering, so we can take care about this requirement.
    Portable Ozone Gas Monitor 0-500ppm
    Can you provide digital Portable Ozone Gas Monitor with 0-500ppm measuring range?
    From: Jim | Date: 06/05/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Hi, Jim. We can provide O3 deector with 0-500ppm measuring range and 0.1ppm resolution.
    Factory calibration certificate for your portable ozone (O3) gas detector
    Can you provide standard factory calibration certificate for Portable Ozone (O3) Gas Detector? What is the price?
    From: Barry | Date: 08/06/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, we can provide standard factory calibration certificate free of charge.
    We need to use your O3 gas detector in a closed loop system...
    Hi. We need to use your O3 gas detector in a closed loop system and a PC will have to interface with our controller, not a person.
    What we need is to be able to read the data from your O3 detector in real time, and to send these data to our system by means of a PC.
    Could you please kindly provide us with the communication protocol so that we may interrogate the O3 detector on the measurement it’s taking in real time?
    From: Roman | Date: 30/06/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Hi, Roman. Just note that our Portable Ozone (O3) Gas Detector only has the data logging function. But if you want to communicate your PC via RS485 and view data in real time, it is recommended to use our Fixed Gas Detector with RS485 output (optional), and we can provide RS485 protocol for such purpose.
    I have a couple of questions about the Portable Ozone (O3) Gas Detector...
    I have a couple of questions about the Portable Ozone (O3) Gas Detector, 0 to 10 ppm to be used for ambient Ozone detection:
    - Is calibration required for the device? How often is it required to be calibrated?
    - We are going to use this device to detect Ozone gas in our lab environment. What is its detection board? Can it detect the ozone gas from 5m distance? or we should be very close to the area with high ozone concentration?
    - Is it a directional device? it means can device detect the ozone gas in all directions or it should be held in a specific direction to detect the gas?
    From: Dominic | Date: 08/09/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Hi, Dominic. For your questions, please check below:
    - The gas detector will be well calibrated before leaving the factory, and you can re-calibrate after 6 month or 12 month based on your usage.
    - The detection range is 15 meter, so there will not be a problem for 5 meters.
    - The gas detector has a suction pump, so it automatically absorb the surrounding gas, so the device detects the ozone gas in all directions.
    Ozone gas detetcor measuring principle
    Is your Ozone gas detetcor measuring principle UV absorption?
    From: Ana | Date: 24/11/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    No,  the measurement principle of our O3 detector is electrochemical, not the UV absorption.
    Questions and answers about ozone gas detector
    We are interested in purchasing some of your ozone devices that have the 0-10 ppm range. We have a bunch of questions though:
    What is the resolution?
    From: Yoder | Date: 12/10/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    How low can it accurately read?
    Is there traceability/calibration?
    1. For ozone measuring range in 0-10 ppm, the resolution is 0.01 ppm, and the lowest accurate detection limit is 0.2 ppm.
    2. We will calibrate the gas detector before leaving the factory, using ozone generator 1:1 to calibrate, and provide the factory standard calibration report for your reference.
    This is an item worth repurchasing
    When I encounter problems in the experiment, ATO engineers will patiently and timely answer my doubts, which improves my favorability of this detector, and my colleagues also say that this is a good ozone gas detector.
    From: Ezra | Date: 19/04/2022
    Was this review helpful? Yes No (0/0)
    delivery time
    If I order a O3 sensor, how long it can arrive (within US)?
    From: Alian | Date: 29/07/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    3~4 days to the United States. If the calibration kit is added, it will take about a week.
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