Monitoring underground water resources in Brasil
The Coca-Cola FENSA plant in Mogi das Cruzes is responsible for bottling mineral water supplied from two ground water sources. The plant is a benchmark for environmental sustainability projects. With this pioneer projct the Mogi das Cruzes plant was the first of the Coca-Cola FENSA Group to install an online analysis monitoring.
OTT PLS
Sonde de pression à cellule de mesure en céramique OTT PLS pour la mesure du niveau et de la température des eaux souterraines et des eaux de surface
OTT PLS est une solide sonde de pression à cellule de mesure en céramique avec sortie SDI-12 ou 4 à 20 mA. Cette sonde de pression mesure précisément et avec fiabilité le niveau et la température des eaux souterraines et de surface.
- Eau de surface Eau souterraine
- Sonde de pression avec cellule de mesure céramique
- Niveau d'eau/pression, température de l'eau
- Niveau d'eau et mesure de la température de l'eau - Raccordement à une station d'acquisition et de transmission externe
- 0 à 4, 10, 20, 40, et 100 m
- ± 0,05 % de la valeur finale de la plage de mesure
- Oui
- SDI-12, RS-485 (protocole SDI-12) ou 4 à 20 mA
Monitoring of level, temperature, pH and conductivity at two underground, Coca-Cola - mineral springs in Mogi das Cruzes - Brazil, with remote transmission of data
The Coca-Cola FENSA plant in Mogi das Cruzes is responsible for bottling mineral water supplied from two ground water sources. The plant is a benchmark for environmental sustainability projects. With this pioneer projct the Mogi das Cruzes plant was the first of the Coca-Cola FENSA Group to install an online Level, Temperature, pH, and Conductivity analysis monitoring. The system had to comply with with ordinance 374 article 4.3.2 of the National Department of Mineral Production (DNPM).
Monitoring Solution
The monitoring system consists of a level and temperature probe with a ceramic capacitive pressure sensor. It is fitted with a vented cable to compensate for barometric pressure, a digital conductivity sensor, a combined digital pH electrode, and Digital SC200 controller to connect the pH and conductivity sensors via a plug & play type digital interface with a bright LCD display, a OTT Duosens datalogger with SDI12 interface, and analog extension to interface with the SC200 controller, and GSM / GPRS modem.
The level sensor was installed in a 1" tube at a depth of 150m, the pH and conductivity sensors were installed in a flow cell through ½" hole made in the main pipe. All sensors were connected to an
OTT Duosens datalogger with a GSM / GPRS modem, transmitting data hourly to the Coca-Cola FENSA FTP server.
The SDI-12 serial communication reduces power consumption and enables simultaneous monitoring of the water temperature.
The use of a ceramic capacitive level sensor with a ventilated cable, reduces the cost of maintenance since it is mechanically robust, has excellent long-term stability, and real compensation of the variation in water density of the water column, as a function of temperature.
The Kevlar coated cable does not loop and therefore does not generate the misleading impression that the water level is rising with time.