The 14th China Enzyme Engineering Academic Symposium was successfully held in Hangzhou, Zhejiang from August 18th to 20th. Academician Zheng Yuguo, academician of the CAE Member and director of the Academic Committee of Zhejiang University of Technology, attended the meeting and was invited to give a special report. Zheng Huajun, Vice President of Zhejiang University of Technology, Wu Bian, Director of the Specialized Committee of Enzyme Engineering of the Chinese Society of Microbiology, and the Institute of Microbiology of the Chinese Academy of Sciences attended the meeting and delivered speeches successively. More than 550 renowned experts, professors, scholars, and entrepreneurs in the field of enzyme engineering from universities, research institutes, enterprises, and institutions across the country attended the conference. The opening ceremony of the conference was presided over by Zheng Renchao, Dean of the School of Bioengineering at Zhejiang University of Technology

At this conference, Changsha Sichen Instrument Technology Co., Ltd. presented a pH automatic control liquid addition system that is widely used in enzyme engineering experiments

[Instrument Overview]

The SC-100ApH automatic control liquid addition system (single pump) is a new type of automated control equipment that integrates real-time online or static pH control, measurement, and automatic acid and alkali addition adjustment. High pH accuracy and good stability. Widely used in universities, research institutes, laboratories, pilot workshops, industrial production processes for the preparation of specific pH solutions, and other places where pH values need to be detected, controlled, and adjusted in production processes.

[Scope of Application]

◆ Laboratories of higher education institutions and research institutes: Preparation of specific pH solutions for tissue culture and automatic pH titration.

Pharmaceutical, biochemical, chemical, spraying, and electroplating factories: pH adjustment and control of liquid addition in reactors, reaction tanks, reaction kettles, and solution tanks.

◆ Bioengineering reactors and food fermentation factories: preparation of pH buffer solution and control of cultivation process adjustment.

◆ Plant Extract Workshop: Acid base washing regulation and control of ion exchange columns.

◆ Hospital analysis room: adjust and control pH value during preparation and inspection.

Environmental protection power generation, circulating water, tap water purification, pH control in industrial wastewater and municipal sewage treatment processes.

[Technical Parameters]

1. Working power supply: AC220V ± 10%, 50Hz

2. Control range: 0-14 pH

3. Measurement accuracy: ± 0.05 pH

4. Resolution: 0.01 pH

5. Pump head speed: 0.1-300 revolutions per minute infinite speed regulation

6. Speed display: OLED high-definition LCD window display

7. Liquid addition rate: 0.12-190ml/min (tap water)

8. Liquid filling pump head: single pump

9. Measuring electrode: pH triple composite electrode or glass electrode

10. Temperature compensation: Automatic temperature compensation (PT1000)

11. PH controller: high-precision intelligent controller

12. PH electrode suitable temperature: 0-80 ℃

13. PH standard solution: 6.86/4.00

14. Dimensions: 330 * 310 * 230mm

15. Environmental temperature: Room temperature~40 ℃ Relative humidity:<80%

16. Whole machine weight: approximately 8kg

[Control Method]

Control mode: automatic, manual, stop

A: Automatic mode: The instrument will automatically start/stop adding acid (alkali) and adjust the pH value to the set range based on the real-time detected pH value and the set value.

B: Manual mode: not controlled by the pH controller, continuously rotating, manually starting/stopping acid (alkali) addition, adjusting the pH value to the set range. It can also be used for quick adjustment, or to drive away bubbles inside the tube, or for the transportation of other liquids

C: Stop: Stop the liquid addition action, but the pH value is detected and displayed in real-time; Used for standby or adjustment purposes, it can also be used as an online pH measurement display terminal.

[Performance Characteristics]

◆ High precision intelligent pH controller, with a large LCD screen displaying dynamic pH and temperature values in real-time, and an alarm for exceeding the range.

◆ Multiple control measurement modes: automatic, manual, stop, can be freely switched, achieving multiple uses for one machine.

Single pump for adding acid or alkali, suitable for using only one liquid (acid or alkali) to adjust and control the pH value.

◆ Adopting OLED high-definition LCD window, it displays the current motor speed and working status separately, and the liquid addition rate can be infinitely adjusted.

The upper and lower limits of pH value can be freely set, and the set value and measured value are displayed simultaneously.

The pH electrode can be calibrated at one or two points, and the pH value and temperature can be automatically measured. The pH value can be automatically calibrated according to temperature.

◆ Adopting a stepper motor to control the peristaltic pump for liquid addition, the liquid contacts the inlet pump tube without touching the pump body, resulting in no pollution.

◆ Choosing different forms of pH precision composite electrodes, as well as electrode sheaths and extension rods made of PTFE material, can be used to monitor and adjust pH values in special containers at high temperatures, reaction vessels, and reactors.