This PID pre-filter tube is for selective determination of benzene in air containing a mixture of volatile organic compounds (e.g., toluene, xylene, ethyl benzene, octane, etc.). Variants of the tube are available for use with PID instruments, such as the Tiger Select by Ion Science and the UltraRAE 3000 by RAE Systems. The measuring range for benzene using the PID pre-filter tube is 50 ppb to 200 ppm.
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