The OTT CBS uses the drift-free measuring principle and covers a measurement range of up to 30 m. An integrated compact piston pump produces the necessary bubbling pressure for the indirect measuring principle. Through a connected measuring tube the compressed air will be blown out in the water via a bubble pot. After the process of blowing the pressure between the measuring tube and the water pressure at the bubble pot is equalised. A pressure measuring cell in OTT CBS measures the air pressure and the prevailing measuring tube pressure successively. By taking the difference between both signals the exact water level will be calculated compensated by drift. The measuring results can be transmitted via SDI-12 interface or a 4...20 mA analog signal. The measurement and pumping procedures is carried out at adjustable measuring intervals. After a measurement the OTT CBS is being switched off automatically until the next measurement cycle (standby mode). |