Several Points to Master Regarding Precautions for Toxic Gas Detectors
① Perform regular calibration and testing.
Like other analytical instruments, toxic and harmful gas detectors adopt the relative comparison method for measurement.
The instrument is first calibrated with zero gas and standard-concentration gas, and the standard curve is stored inside the device.
During measurement, the instrument compares the electrical signal generated by the target gas with that of the standard gas to calculate the accurate gas concentration.
Therefore, zeroing the instrument at any time and carrying out regular calibration are essential to ensure measurement accuracy.
It should be noted that many gas detectors support replaceable sensors, but this does not mean one detector can be freely fitted with different sensor probes.
Whenever the probe is replaced, the sensor requires a certain activation period, and the instrument must be recalibrated.
In addition, it is recommended to conduct a response test with standard gas before using the instrument to ensure reliable protection.
② Pay attention to the concentration measuring range of the detector.
All types of toxic and harmful gas detectors have fixed detection ranges. Accurate measurement can only be guaranteed within the specified range.
Long-term measurement beyond the detection range may cause permanent damage to the sensor.
For example, an LEL detector may suffer complete sensor burnout if used in an environment above 100% LEL.
Similarly, toxic gas detectors will be damaged under prolonged exposure to high gas concentrations.
Accordingly, if a fixed instrument triggers an over-range alarm, the measurement circuit shall be shut down immediately to protect the sensor.
