Ozone Monitor Calibration
Most ozone sensor manufacturers will recommend calibration annually. This would be the longest interval Oxidation Tech would recommend for ozone sensor calibration.
Frequency of calibration will be depending upon the sensor type, and purpose of the gas 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.
To accurately calibrate any gas sensor a known amount of calibration gas must be produced and exposed to the gas sensor. As ozone has a very short half life there is no option of using bottled calibration gas as would normally be used for most gas sensor calibrations. Therefore a device or system is required to calibrate your ozone sensor.
Oxidation Tech uses a calibration chamber with a dual beam ThermoFichsher Ozone Analyzer to create and measure ozone levels. This chamber is used for all in-house ozone sensor calibrations. It is not practical for customers with only a few ozone sensors on-site to own or maintain an ozone analyzer chamber for ozone sensor calibration. Due this most ozone sensor calibrations are performed in-house at our facility.
Field calibration is just what it indicates. Any calibration of a sensor performed in the field, or where the ozone sensor is currently installed. This can be performed with a calibration kit designed specifically for your ozone sensor.
The A23-14 is a commonly used calibration kit for field calibration of ozone sensors. Click image below to view details on this device. The ATI A23-14 is available for sale or rent. Should you have questions if this kit can be used with your sensors, or for the device that is right for you, please contact our office.
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 ozone sensors can be performed by Oxidation Tech, 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 a small amount of ozone gas, or other gas that create a response for your specific ozone sensor. While not a precise process, this does ensure that your ozone sensor is indeed responding and can respond in a critical situation where human safety is critical.
ATI offers an Auto-Test generator for the ozone sensors used on the D12, F12 and A14 monitors. This auto-test generator will produce a small amount of ozone gas that will cause the sensor to react. A test is run on a pre-set schedule, if the ozone sensor does not respond as expected an alarm will come on indicating the sensor has failed. This is a great option for gas sensing in critical applications.
Bump testing is a great method to ensure your sensor is responding ozone when necessary. Bump testing is not a replacement for calibration.
Calibration verifies that the sensor is accurate and providing correct measurements of ozone gas.
Zero calibration ensured the sensor is reading an accurate 0, or pure air situation. Most ozone monitors have an easy way to reset the zero in the event that it drifts over time.
Span calibration is ensuring the actual measurement of ozone gas is accurate. The span should be done at a level of ozone that would normally be measured. Create a known amount of ozone gas at a specific level and verify the sensor displays the same level of ozone.
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.