ABB 266CSH - Fill Level Measurement on Closed Tanks; Fill Level Measurement on Open Tanks with Fluids

266CRH / 266CRT, 266CSH / 266CST MULTIVARIABLE PRESSURE TRANSMITTER | OI/266CXX/MODBUS-EN REV. A 29
Fill level measurement on closed tanks
Non-condensing measuring medium (dry leg)
H High pressure sid
L Low pressure side
1 Gas
2 Liquid
3 Condensate trap
Figure 20: Level measurement on closed tanks (dry leg)
• Mount the transmitter at the same height or below the
lowest level to be measured.
• Connect the high pressure side ‘+’ of the transmitter to the
bottom of the tank.
• Connect the low pressure side ‘Æ’ of the transmitter to the
top of the tank, above the maximum level.
Fill level measurement on open tanks with fluids
H High pressure side
L Low pressure side
1 Liquid
Figure 21: Level measurement on open tanks
• Mount the transmitter at the same height or below the
lowest level to be measured.
• Connect the high pressure side ‘+’ of the transmitter to the
bottom of the tank.
• Leave the low pressure side ‘–’ of the transmitter open to the
atmosphere.