VOC detector is a very sensitive detection instrument, which can detect the concentration of VOC gas at ppm or even ppb level. In order to ensure the accuracy of the ground data, we need to calibrate the VOC detector before and during the use. Usually, the purpose of the VOC detector is to determine the background signal of the presence of important gases. The zero-point signal includes an electronic blank signal and a signal of zero-corrected ambient fresh air. Theoretically, in the zero calibration process, including the electronic blank signal and the zero calibration environment fresh air signal should be canceled. Therefore, fresh air should be used as the zero gas for zero calibration. How often should the VOC detector be calibrated? The following is a brief introduction by yi yun Tian:

Calibration time of VOC detector:

The general calibration cycle of VOC detector is once in January.

If the VOC detector is not used frequently, this maintenance is not required. In this case, calibration can be performed before each use, and it is recommended that the interval between the calibration date and the use date should not exceed 1 month. In addition to calibration, a functional test is recommended before each use to ensure proper instrument response to gases.

For custom calibration, the parameters should be set first. The microprocessor of the VOC detector can automatically store and use CF of many gases. In this way, we can preset these parameters so that the instrument automatically reads the concentration of the gas to be measured.

The correction coefficient directly obtains the concentration of the gas to be measured by comparing it with the correction gas. For example, the sensitivity of benzene is about the common correction gas (CF = 1. 00), in this way, when we measure PPM benzene with an instrument calibrated by iso-J ene, we can have the following suggestions: multiply the reading directly by 0.53, and we will get the actual benzene concentration of 2ppm. In addition, we can also set the correction coefficient of the instrument directly to 0.53, so as to directly obtain the concentration of benzene.

The VOC detector can be used for custom calibration with any gas concentration higher than 10ppm.Please prepare a bottle of the selected gas for each concentration, and recommend using a demand flow regulator. The flow rate of each flow regulator should be adjusted to 0.3L per minute. A flow adapter should also be used to avoid over-pressurization of the instrument. Prepare the gas cylinder, regulator and zero carbon filter before starting the calibration procedure. In addition, a clean source is used as the zero value gas. Please make sure you are familiar with the whole calibration process before calibrating the VOC detector.

regarding how long the VOC detector should be calibrated, today yi yun Tian xiaobian will introduce it to you. In the process of use, even if the VOC detector is not used for a long time or is often used, it needs to be calibrated and tested every certain cycle time. Because when the VOC detector is used for a long time, its accuracy is bound to decline due to the loss of the sensor, the use environment or the interference gas of the instrument itself. At this time, in order to ensure the accuracy of the VOC detector, the testing and calibration of the VOC detector is very necessary.