Resolution of D16 PortaSens III Portable Detector with Ozone 00-1009 Sensor

The D16 PortaSens III Handheld Monitor with the Ozone Sensor part number 00-1009 can have the detecting range set by the user at any range from 0-5 ppm ozone up to 0-200 ppm ozone. The resolution is 0.1 ppm ozone at any range from 0-5 ppm up to 0-49.9 ppm ozone. The resolution of the readout on the screen is 1 ppm ozone when set at the range of 0-50 ppm up to 0-200 ppm. The standard range for this sensor is 0-20 ppm ozone, which has a resolution of 0.1 ppm.

Purchase D16 Handheld Monitor with O3 Sensor 00-1009 here:

If you already have a C16 or D16 PortaSens monitor and need only the replacement ozone sensor, you can purchase just the sensor cartridge PN# 00-1009 here:

Watch Video Showing Resolution at Various Range Settings:

Video Showing How Resolution of Sensor 00-1009 Increases with Lower Range Settings

How to Wire OS-6 Ozone Monitor to Remote Alarm Panel for O3 Safety Monitoring

The EcoSensors OS-6 Ozone Monitor has a safety control relay built in that is set to activate above the ozone human safety limit of 0.1 ppm. When this relay is wired to the Remote Alarm Panel (RAP-1), a loud audible alarm and flashing light will activate when ozone levels go above 0.1 ppm. This blog explains how to wire the RAP-1 to the safety control relay on the OS-6 Ozone Monitor.

Step 1: Remove the front panel on the OS-6.
Step 2: Insert tip of RAP-1 free cable through one of the nipples on the bottom of the OS-6 monitor.
Step 3: Locate the control relay labeled “ABOVE 0.1 PPM.” Connect the red wire to the Normally Open (N/O) terminal and the black wire to the Common (COM) terminal.
Step 4: Replace the OS-6 front panel.

The OS-6 is now wired to the RAP-1. When mounted on a wall and powered on, an audible and visual alarm will now activate when the ozone levels are above the human safety limit of 0.1 ppm.

Ozone Levels Below 0.1 PPM – Alarm Not Activated
Ozone Levels Above 0.1 PPM – Alarm Activated

Purchase OS-6 Ozone Safety Monitor Here:
Purchase RAP-1 Remote Alarm Panel Here:

Watch video showing how to wire OS-6 Ozone Detector to RAP-1:

Ozone alarm in use, audible and visual

Remote Audible Alarm Panel (RAP-1) is Activated by OS-6 Monitor Relay when Ozone is above 0.1 PPM

RAP-1 Audible and Visual Alarm Activates when Ozone Levels are above 0.1 PPM

In this video the RAP-1, which is a remote audible / visual alarm, is wired to the safety relay switch in the OS-6 Ozone Monitor, which is set to trigger above a 0.1 ppm ozone level. According to OSHA, the exposure limit for workers is 0.1 ppm for 8 hours per day. This relay is permanently programmed to always activate above 0.1 ppm ozone levels.

The decibel levels on the RAP-1 range from 92-103 dBA. The volume can be adjusted by turning the little black dial on the RAP-1 (shown in the video). The RAP-1 light and audible alarm are activated the entire time the OS-6 reads above 0.1 ppm ozone. As the ozone levels drop, the readings drop and result in the flashing light and audible alarm stopping after the reading goes below 0.1 ppm ozone.

Both devices can be purchased through our website. Each product is linked to below:

The RAP-1 Remote Audible Alarm Panel can be purchased here:

The OS-6 Ozone Monitor can be purchased here:

Introduction to the EZ-1Z Handheld Ozone Detector

We created a new video about the EZ-1X handheld ozone detector.  This shows the basic functions and what comes in the box with the EZ-1X ozone detector.

The EcoSensors EZ-1X Ozone Detector is a portable detector used for personal safety in the workplace. It responds instantly to ozone in the air, with an LED readout that goes from zero to 0.14 PPM. 0.14 PPM ozone is the OSHA recommended safety level for an 8-hour shift. The LED lights go from green, to yellow, to red indicating the upper OSHA ozone limit is being reached.

EZ-1X handheld ozone sensor

Purchase the EcoSensor EZ-1X Ozone Safety Detector here

Included in the package for the EZ-1X Ozone detector is the monitor itself, the calibration certificate, and the charging cord. The calibration certificate includes the serial number of the unit, data about the calibration process, and the date of calibration. This document needs to be kept for your records, as the ozone monitor should be recalibrated yearly. The EZ-1X ozone detector should be plugged in and fully charged before being used for a work shift. Once fully charged, the EZ-1X detector has a battery life of 8 hours. The monitor needs to go through an initial warmup phase – plugged in and powered on for at least 24 hours before first use. This allows the oxidation to burn off the ozone sensor, allowing the sensor to read ozone levels accurately. The green LED light will automatically light up when the EZ-1X ozone detector is plugged in, indicating that the meter is powered on while also charging. The switch should be in the “AC Power and Bat Chg” position while this ozone detector is plugged in.

When the EZ-1X is plugged in, and the green light is ON it is actually ON and sensing ozone, and can be left that way indefinitely.

The EZ-1X detector reads ozone from 0 – 0.14 ppm and indicates ozone levels with LED bars that illuminate as the ozone levels. 0.1 ppm is the 8-hour OSHA exposure limit for ozone making the EZ-1X an ideal monitor for measuring low-range ozone levels for safety.

Ozone Sensor SM-X

The SM-X ozone sensor was a replacement sensor for the OS-4, OS-6, and A-22.  However, the SM-X is no longer in production and is now obsolete.

SM-X Replacement Sensor

The SM-6 also used the SM-X as a replacement sensor and also no longer available for purchase.

SM-6 with SM-X

The replacement ozone sensor SM-X (also known as the SM-X-20 or SM-X-2) was paired with EcoSensors OS-4 Ozone Switch, OS-6 Ozone Controller, and A-22 Ozone Monitor. The following options are now available instead:

A-22 Ozone Monitor

A-22 Ozone Monitor

The A-22 is obsolete and there is no replacement sensor option available.  We recommend the following as comparable ozone monitor options to replace your A-22:
D-16 with Ozone 0-20 ppm –
S-300 with EOZ 0-10 ppm –

OS-4 Ozone Switch & OS-6 Ozone Controller

OS-4 Ozone Switch

OS-6 Ozone Controller

The OS-4 and OS-6 Ozone Detectors can be upgraded to use the SM-7/SM-EC electrochemical sensor as an ozone replacement sensor to the SM-6/SM-X.  The new SM-7 will need to be connected to the OS-4 and OS-6 via the wired cable.

SM-7/SM-EC Ozone Sensor

There are two range options for the new SM-7/SM-EC sensor: 0-20ppm or 1-50ppm.  Both range options can be used with the OS-6, but only the 0-20ppm can be used with the OS-4. After you have upgraded to the SM-7/SM-EC then only replacing the SM-EC sensor that’s inside of the SM-7 needs to be done for future sensor replacement.

SM-EC sensor module

The SM-7/SM-EC ozone sensors should be replaced annually as the sensor calibration is good for up to 1 year.

Feel free to contact us with any questions that you have about the SM-X ozone sensor being discontinued.

Aeroqual Ozone Detectors


aeroqual ozone monitor
Aeroqual Ozone Detectors can detect many environmental air quality gasses beyond ozone

Aeroqual ozone detectors are the perfect solution when high accuracy, low-level detection of ozone is required.  Aeroqual provides ozone monitors in handheld or fixed mount versions that measure ozone as low as 1 ppb with reliable and consistent accuracy.  The Aeroqual ozone detector is the only sensor based technology that can accurately measure ozone at low levels, every other technology uses the much more expensive UV based photometer technology.  Aeroqual allows for small footprint and economical cost.

Aeroqual ozone detectors can also be used to measure a wide variety of other gasses.  Sensor heads can be purchased and placed on the Aeroqual Ozone Monitor to measure those gasses with only a short warm-up period between gas detection.  Accessories, such as a carry case, remote mount kit, and wall bracket are also available to further add to the function of the Aeroqual Ozone Detector.

Not sure what device is right for you?  Give a call, we would love to help.



B12 Ozone Sensor is cost effective solution

The B12 ozone sensor was recently added to our website with options for an ozone sensor or oxygen sensor for ambient oxygen levels.  The B12 is a basic sensor offering a display, 4-20 mA output, XP rating, and remote sensor options.

B12 with a display
B12 Ozone Sensor with display

Starting at only $600, the B12 is a very cost effective option for basic ozone monitoring.  The reliability of ATI at a price point of much lower cost options!

Dimensions of B12 ozone gas sensor
B12 Ozone Sensor dimensions

For more ozone gas detection options check our our full list of ozone monitors HERE.

Ozone Sensor Calibration Information


Ozone Sensor Calibration Information

All Ozone Sensors will require periodic calibration to ensure your gas measurements are accurate and correct.  Different gasses, and sensor manufacturers will have differing requirements and methods for calibration.  This page will serve to provide general calibration information and links to specific calibration procedures from the sensor manufacturers we represent.

Should you have any questions about sensor calibration, or would like us to help you with your calibrations please contact us.


Most sensor manufacturers will recommend calibration annually.  This would be the longest interval Ozone Services would recommend for ozone sensor calibration.

The frequency of calibration will be depending upon the gasses measured, sensor type, and purpose of the ozone sensor.

Our general recommendation would be to perform a bump-test of the sensor at least monthly.  Perform a field or factory calibration or sensor check every 6-months, and a factory calibration or sensor replacement every 12-months.



Have you ever wondered who ensured 1 pound is exactly 1 pound?  and 1 meter is precisely 1 meter? The NIST is the answer.  this is the governing board that will hold the standard of measurement.

Every gas measurement calibration standard must be directly traceable to the NIST to ensure your sensors calibration is accurate.  When you are reviewing your calibration certificate it must be clearly stated that the calibration standard used to calibrate your sensor is NIST traceable.  If necessary, you can, and should request the proper documentation to validate that traceability.

Calibration gasses can also be NIST traceable The NIST has set-up specific protocols for manufacturers of calibration gasses to follow to ensure your cal gas can be provided with NIST traceability.



Calibration gasses are used to calibrate many gas sensors.  Known quantities of gas can be mixed with air to provide a span calibration gas to be used for calibration.  For example. if you are calibrating a chlorine sensor and would like to perform a span gas calibration at 5 ppm, you would purchase a cylinder of air mixed with exactly 5 ppm of chlorine.  This gas can be used according to the manufacturers specifications to perform a span gas calibration.

Ozone is a gas that must be produced on site in known quantities to perform calibration.  The only option for precise ozone gas sensor calibration is sending your sensor to a facility that has a specially build calibration chamber.


Field calibration is just what it indicates.  Any calibration of a sensor performed in the field, or where the sensor is currently installed.  This can be performed with calibration gasses, or with devices designed to produce gasses that will react properly to ensure calibration is accurate on your sensor.

Field calibration is convenient for applications where many sensors are installed and would be challenging or inconvenient to send away for calibration.  Field calibration of your sensors can be performed by Gas Sensing, and many other service companies that will calibrate, and repair your sensors.



When you want to know if your sensor is responding a bump test is a great option.  This is simply a test that exposes the sensor to the specific gas it is intended to measure and ensure that the sensor does indeed respond.  While not a precise process, this does ensure that the sensor is indeed responding and can respond in a critical situation where human safety is critical.

ATI offers an Auto-Test generator for many of the sensors used on the D12 and F12 monitors.  This auto-test generator will produce a gas that causes the proper sensor to react.  A test is run on a pre-set schedule if the gas sensor does not respond as expected an alarm will come on indicating the sensor has failed.  This is a great option for gas sensing is critical applications.

Note: A bump-test is not an acceptable replacement for sensor calibration



Bump testing is a great method to ensure your sensor is responding to the gas it is intended to measure.  Bump testing is not a replacement for calibration.

Calibration verifies that the sensor is accurate and providing correct measurements.



Zero calibration ensured the sensor is reading an accurate 0, or pure air situation.  Most sensors have an easy way to reset the zero in the event that it drifts over time.



Span calibration is ensuring the actual measurement of gas is accurate.  The span should be done at a level of gas that would normally be measured.  Create a known amount of gas at a specific level and verify the sensor displays the same level of gas.



A calibration certificate is provided by the manufacturer when you purchase a sensor.  The calibration certificate provides you with the necessary information to prove that the sensor was calibrated to an NIST standard.  The Calibration Certificate will provide the date the sensor was calibrated, and the date calibration should be done again.

Click here to see a visual explanation of the contents of a typical calibration certificate.



Calibration information on ATI sensor

ATI Sensor Calibration Information



Aeroqual handheld sensors, and fixed mount sensor heads can be calibrated using the Series-300, or Series-500 base and R42 Calibrator.

Aeroqual Sensor Head Calibration Information



EcoSensors devices have a variety of options for calibration.  We provide necessary information at the link below:

EcoSensors Calibration Information

New EcoSensors SM-7 Ozone Sensor

EcoSensors recently released the new SM-7 Ozone Sensor for sale.  This is the first Electrochemical based ozone sensor available from EcoSensors (previous sensors were all HMOS).  This sensor reliably and accurately detects ozone from 0-50 ppm.

SM-7 Sensor with SM-EC

The SM-7 can be used as a stand alone sensor transmissiting module using RS-232 communications.  Or, it can be used with either the OS-6 or OS-4 remote mount sensors from EcoSensors.

OS-6 Ozone Controller
OS-6 Ozone Controller


OS-4 Ozone Switch
OS-4 Ozone Switch

Typical Applications:

  • Laundries using ozone.
  • Large noisy factory environments.
  • Casinos and other ozonated public areas.
  • Agricultural storage areas.
  • Farms.
  • Food processing plants.


  • 25ppb sensitivity with 5ppb resolution.
  • Wide operating range (.02-50ppm).
  • Electrochemical Sensor
  • Wide detection range
  • Low Power
  • Low Maintenance
  • Uses easily available 8-24 VDC power.
  • Small enough to mount almost anywhere.

The SM-EC is an electrochemical ozone sensor module for use with our OS-6 digital instrument. This new technology from Eco Sensors provides accurate ppb-level detection and resolution over a wide (.2-50 ppm) concentration range. The sensor module is compensated for temperature and humidity effects, with little to no cross sensitivity to VOC’s. The SM-EC makes our digital instruments more accurate at both ppb and high ppm levels of ozone, enabling improved monitoring and control for our users.

For more info on this sensor, or any other ozone sensor contact us, we would be glad to put our experience to use for you.


Aeroqual Series-300 Ozone Monitor

We have updated the options and online ordering for our Series-300 Ozone MonitorAeroqual Series-300 with sensors

If you have not looked at the Aeroqual Handheld Monitor line it is time you do.  There are a variety of great updates to these monitors.

Aeroqual Series-300

Remember that The Series-300 can measure a variety of gasses.  This means one device can use multiple sensors to save you money.

Large carry case for Aeroqual handheld monitorsNew Large Heavy Duty Carry case


Replacement & Add-On Sensors:

Replacement (or additional) sensor heads are available for all of the gases listed above. You can find their details and pricing on our Replacement Sensors page!


The Series-300 includes all the features of the popular Series-200 handheld but adds features like, controls, alarms, calibration capabilities, and analog outputs.  The Series-300 is highly functional as it can be used as a handheld, but also as a safety monitor mounted to the wall, or even controlling your ozone system system.



Series 300 Product Spec Sheet

Series 300 Quick Guide

Series 300 Product Manual

Links to more info:

Calibration information

Tech info and Specivications on each available Gas Sensor