用读数保持电路记录压力变化，较直接读取刻度值更加准确，可靠。
More precise and reliable recording is achieved by reading-keeping circuit compared with the original gauge-reading.
通过实验验证，该系统有效地提高了便携式甲烷报警仪的发放速度，并可以更加完整的、准确的记录了便携式甲烷报警仪的发放信息。
Experimental results showed: System increased the efficiency of the sending of alarm instruments and completely record the information of alarm instruments sending and receiving.
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