Problems in the application of portable VOC gas detectors
What is the reason for the inconsistency between the portable VOCs gas detector and the online VOC gas detector?
There are errors in the two instruments, and it is impossible for every machine to be exactly the same. In the actual situation, even a machine cannot guarantee that the results are exactly the same every time! If you still have doubts about the test results, you can use a special standard gas to calibrate the meter, which can make the test value of the meter closer to the real.
The value of the meter rises or takes a long time to recover during the detection process, how to solve it?
The speed of the meter sampling pump can be set to a high speed, which can effectively improve the reaction time of the meter
The sampling distance of the portable VOCs gas detector is 10 meters, is 30 meters ok?
As a portable gas detector, it is mainly convenient and practical. In fact, the sampling distance of 30 meters is also possible, but it will prolong the sampling time, and the internal resistance of the sampling pipeline will increase, resulting in data lag. If the sampling pipeline is too long, there is not much practicality. significance.
What gas is used for calibration of the portable VOCs gas detector?
Calibration means calibration to ensure the linearity and accuracy of the instrument.
TVOC detectors generally use the principle of PID photoion now, and TVOC contains too many gas components, and only one of the gases with stable chemical properties can be used as the standard gas, so isobutylene is selected as the standard gas.
Can the portable VOCs gas detector be applied to the detection of high temperature conditions?
This kind of instrument cannot be directly used in high-temperature working conditions, and a sampling pipeline of about 10 meters can be used to connect the instrument, and the sample gas can be introduced into the instrument for testing by using natural cooling
How often should the disc filter of the portable VOCs gas detector be replaced?
The appearance of the disc filter is transparent, and the degree of pollution is based on visual inspection of whether the dust particles cover a large area of the diaphragm. If so, it should be replaced.
What's the difference between blue and yellow gauges?
There is no substantial difference, and the color can be selected according to the user's preference. The portable instruments of the two colors have explosion-proof and non-explosion-proof models.
What are the consequences of using the portable VOCs gas detector beyond the standard?
It will cause high-concentration VOC gas to adhere to the disc filter, sampling probe, filter assembly, sensor lamp, etc., resulting in inaccurate detection data, excessive alarms, and false alarms. The value is very high at the beginning of the startup and then the value goes down.
How to deal with the portable VOCs gas detector after being polluted by ultra-high concentration VOC gas?
The sampling probe part can be purged with nitrogen for about 30 minutes. The sensor needs to be disassembled and the sensor light should be wiped. After cleaning, re-calibrate the zero point and span for backup.
