碳化塔作业时,塔内液位高度控制如何,对碳酸氢氨的生产是一个重要因素。对于自动化程度还不高的碳化系统来说,碳化塔液位信号是必要的。由于塔内信号电极棒容易附着结晶碳氨和塔内液体,具有较大直流电阻以及随着液体浓度变化引起该直流电阻变化,因此利用液体与电极棒的接触与断开作为24V信号灯开关或用一般共电共射晶体管电路继电器来控制信号灯的方法,难于使液位信号准确可靠。最近我们用晶体管共基电路和共射分电路继电器来控制液位信号,通过三个月的应用证 Carbonation tower operation, the tower level control of how the level of ammonia bicarbonate production is an important factor. Carbonization tower level signals are necessary for carbonation systems that are not yet automated. Because the tower signal electrode stick easily attached to the crystallization of carbon ammonia and tower liquid, with a larger DC resistance and as the liquid concentration changes caused by the DC resistance changes, so the liquid and the electrode rod contact and disconnect as a 24V light switch or General common-emitter transistor circuit relays to control the signal light method, it is difficult to make the signal level is accurate and reliable. Recently, we used transistor-based common-base circuit and sub-relay circuit to control the level signal relay, through the three-month application certificate