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The difference between the measurement result of the recalibrated gas detector and the measured gas concentration is usually less than 10%, so the instrument can be used without calibration. For example, the ammonia gas detector detects 50 ppm standard ammonia gas. If the measurement result of the instrument is 46ppm, 46ppm is 50±10%X50, and the result is 45~55ppm, it can be considered that the detection accuracy of the ammonia detector can be certified without recalibration. I will. Similarly, if the detection result of this ammonia gas detector is 44ppm, it must be recalibrated before using this detector.
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