In a district of Bangkok, there is the brewery "Pathumthani Brewery Co. Ltd.“. Since more than 10 Years, the brewery was built by a German company. The chief engineer of that time is now married in Bangkok and advises the royal company today. In addition to the beer money is made with water bottles. Just prior to packaging, the water is mixed with traces of ozone.
Description
The well water is conveyed and processed via closed sand filter. This water, the bottling plant is supplied. In ca. 20 Meters is an ozone generator from I-Born. The generator itself is a development of I-Born. The ozone is produced in the generator, admixed with an injector a small partial flow of the water. The partial volume flow is mixed with the main flow just before the bottling plant. After mixing, a measurement is carried out, which is to provide a controller.
Measurement
My first visit to Bangkok was exclusively for the Measurement. The customer gave the information, that the display of the transmitter on 0,01 ppm should show exactly. The transmitter has been electronically adapted to this desire and I should train employees in the use of sensors and the transmitter.
At this point the ozone plant was still in a programming- and test phase. Therefore, it was not known, with which desired values the system should operate. The hint, that you can adjust the concentration of ozone very hard over a two-point control, was not taken seriously by the Thai programmers. Nevertheless, he gave the software in the Siemens S7 controller a PID controller module. This block proved 1 Year later than helpful.
The reason for the second visit in November 2016 were the problems of stabilizing the ozone concentration and the calibration of the sensor. They had tried, a sensor having 0 ... 2.0 mg / l to operate at a nominal value 0.05 mg / l and calibrate in this area. Even the reference measurement for this value has not been possible, since the user's individual errors are higher. See Tutorial Calibration.
control
The generator finally the PID block was used. I advised to, the volume flows with two flow measurements at a fixed ratio 1/9 and adjust and regulate the partial flow to a desired value 0.5mg / l. Whether this advice was implemented, I can not say it. But the plant filled since that time Water Bottles.
Of course you have the national drink, the green iced tea, once measure the concentration of ozone:
The object is located here:
Display of localization in the external Link.
My services:
- Training of staff in Metrology and Calibration,
- Advice on regulating the ozone concentration,
- Commissioning of sensors and controllers,
My client:
- DOSATRONIC GmbH, Ravensburg
- I-Born Supply & Service Co. LTD,
Sources:
-
-
- Own recordings
-
Leave a Reply
You must be logged in to post a comment.