故障现象点火后,用蒸馏水调零时,表头读数基本正常,而在测标准溶液时,每次所得的读数偏差很大,有时竟超出表头量程。故障分析检修造成该仪器读数不稳定的原因通常为:①吸液管或雾化器阻塞不畅(该机吸液情况正常,该原因可排除);②供电电源电压波动过大(该仪器接稳压电源,故此原因可排除);③煤气质量不好或减压阀不稳定(该机使用的是优质煤气,减压阀也不 Fault phenomenon After ignition, when using distilled water to zero, the meter reading is basically normal, and when the standard solution is measured, the readings obtained each time have a large deviation, sometimes exceeding the meter range. The reasons for the unstable reading of the instrument caused by fault analysis and overhaul are usually as follows: (1) The suction pipe or atomizer is not congested (the suction condition of the machine is normal, and the reason can be eliminated); (2) The power supply voltage fluctuates too much (the instrument is connected Regulated power supply, so the reasons can be excluded); 3 The gas quality is not good or the pressure reducing valve is unstable (the machine uses high quality gas, and the pressure reducing valve is not