In the waste gas treatment systems of chemical, pharmaceutical, metallurgical, electronic and other industries, the waste gas absorption tower is the core equipment for purifying acidic waste gas, and the concentration of alkali solution is the "lifeline" that determines the purification efficiency. Traditional manual sampling and testing methods (such as titration) have problems such as response lag (single testing takes more than 30 minutes), data interruption (only 2-3 times a day), and large errors (± 1% -2%), which can easily lead to excessive exhaust emissions caused by low alkaline concentration, or waste of raw materials and secondary pollution caused by high concentration. The Shanghai Xuantian SJT-6000A online alkali concentration meter, with its characteristics of "second level response, continuous monitoring, and precise feedback", effectively solves the pain points in this industry and has become a key supporting equipment for the stable operation of waste gas absorption towers. Here is a detailed introduction:

The core advantage of an online alkali concentration meter lies in its real-time performance, which enables uninterrupted monitoring of alkali concentration through the integration of sensors, signal processors, and data transmission modules. The instrument can achieve a data update frequency of 1-5 seconds per time, convert concentration changes into digital signals in real time, and display real-time alkali concentration on the screen. It also supports setting upper and lower limit alarm thresholds. Once the concentration is abnormal, it will immediately trigger an audible and visual alarm or send a control signal to the PLC/DCS system.

This real-time monitoring capability brings multiple values to the operation and management of exhaust gas absorption towers. From the perspective of environmental compliance, online alkali concentration meters can avoid "hidden exceedances" caused by manual testing intervals - for example, a chemical enterprise once faced environmental penalties for excessive discharge of acidic waste gas due to the long manual testing interval, where the alkali concentration dropped below the effective absorption threshold for 4 hours without being detected; After installing the online instrument, if the concentration is lower than the set value (such as NaOH 8%), an alarm will be immediately triggered, and the alkali replenishment system can respond within 10 minutes, effectively eliminating such risks. From the perspective of cost control, real-time monitoring can accurately control the amount of alkali replenishment. Compared with traditional "empirical alkali replenishment", it can reduce alkali loss by 15% -30% and lower the cost of wastewater treatment caused by excessive alkali.

In response to the harsh working conditions of the exhaust gas absorption tower, the Haixuan Tian SJT-6000A online alkali concentration meter also has strong environmental adaptability. The sensor is made of polypropylene or PP anti-corrosion material, which is resistant to acid and alkali corrosion, with a protection level of up to IP68, and can withstand high temperature environments below 90 ℃.

With the increasingly strict environmental regulations and the upgrading of industrial intelligence, online alkali concentration meters have changed from "optional equipment" to "mandatory equipment". It not only meets the real-time monitoring requirements of the exhaust gas treatment system in the Comprehensive Emission Standards for Air Pollutants, but also can be linked with the enterprise environmental protection online monitoring platform and production DCS system through 4-20mA standard signal or RS485 communication interface, achieving closed-loop management of "concentration monitoring automatic alkali replenishment data traceability".