Sensitive element is one of the important to measure the concentration of mathane , and it " s export is a little voltage signal , little signal amplify circuit is to transform the analogue signal to digital signal , display circuit is to display the concentration of mathane , monitoring circuit is to monitor the overstep limit of mathane concentration . the feature is new design , accurately measure parameter , convenient to operate and so on 其中cpu是监控仪的核心，完成数据采集、处理、输出、显示等功能；敏感元件是准确检测甲烷气体含量的主要元件之一，其输出是与甲烷浓度相对应的电压信号；小信号放大电路则是用来放大敏感元件输出的电压信号； a d转换电路把放大了的电压信号由模拟信号变为数字信号送入cpu ；显示电路则显示实时甲烷浓度；报警电路对超限甲烷浓度进行报警。
Major products : water quality testing monitoring instrument : ph meter , conductivity meter , tds meters , orp meter ; pna meter , salt meter ; rotary speed measurement of the machinery manufacturing equipment : many functions tachometer ; air quality testing instrument : thermometer , hygrometer ; others : refractometer , water pump 主要产品：水质检测监控仪： ph酸度计ec电导率仪tds计orp氧化还原计钠度计盐度计机械制造设备转速测量：多功能转速表光电转速表空气质量检测仪：数字温度计温湿度表光学检测仪器：折射仪以及污水潜水泵。
In light of cheng ' s balance container for measuring boiler barrel water - level , a new type instrument is introduced from its principle , characteristics and system composition etc . . this new instrument has self - correcting funcion of water - level based on drum pressure ; and is of a high precision instrument for monitoring water - level of boiler barrels 摘要针对成氏平衡容器，从工作原理、特点、系统组成等方面，介绍了一种新型的汽泡水位测控仪，它具有汽包水位压力自动校正功能，是一种高精度的汽泡水位监控仪。
