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Oizom Multi- Level Calibration System For Environment Monitoring Solution
In laboratory calibration, assembled Oizom devices POLLUDRONE, DUSTROID, ODOSENSE, WEATHERCOM are calibrated with pure air and calibration gases with high range concentrations. In a laboratory setting, zero and span calibration are performed in order to validate the manufacturer’s sensor calibration and determine the sensor offset or gain error if any. In order to perform zero and span calibration, the device is exposed to known concentrations of gases delivered from gas cylinders of NIST (National Institute of Standards and Technology) traceable calibration gas standards in a clean and controlled lab environment. The sensor drift and sensitivity are adjusted (if required) such that the device measures the concentration of the gases passed.
All the sensors are calibrated at Oizom factory before dispatching the equipment to check their functioning. It is basically a Bump Test performed to verify that the sensor is working properly for each parameter. All the parameters in which the equipment is capable of monitoring like particulate concentration gaseous contaminants, noise, odor, temperature, humidity, pressure, light intensity, etc. are tested here.
The sensors are calibrated against a reference station before installation to test their performance in the ambient condition. These reference stations are generally situated near the target locations to calibrate under the required ambient conditions. Around 1000 data points collected at the same time interval is sufficient to calibrate the system. This is an optional calibration and depends on the customer’s requirement.
Through spot calibration, the equipment is calibrated over the cloud, reducing onsite manpower and maintenance cost. It is a periodic calibration performed quarterly or bi-annually depending on the air quality. Oizom uses a recently calibrated sensor-based system or a third-party system trusted by the client as a reference. The reference system should be a continuous monitoring system. Around 150 data points are collected at the same time-interval to re-calibrate a system on the spot.
Oizom equipment is calibrated in the National Accreditation Board for Testing and Calibration Laboratories (NABL) to ensure data accuracy and eliminate cross-sensitivity among the sensors. Calibration is carried out for all the parameters like PM, noise, temperature, humidity, pressure, odor, UV radiations, etc. Gas calibration is done with pure air and calibration gas, at a high concentration range of 1-10 PPM and a flow rate of 0.5L/min.