ABB 266 MODBUS - Liquid Level in a Closed Tank (Dry Leg); Figure 56: Level Measurement on a Closed Tank with Dry Leg

Appendix D Additional mounting examples
96 | 266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB
D.2 Liquid level in a closed tank (dry leg)
The installation guidelines for liquid level measurement in a closed tank with non-condensable fluids (dry leg) are:
1. Mount the transmitter at the same height or below the lowest level to be measured (Figure 56).
2. Connect the + (H) side of the transmitter to the bottom of the tank.
3. Connect the - (L) side of the transmitter to the upper part of the tank, above the maximum fill level of the tank.
Where:
H = High pressure flange
L = Low pressure flange
Figure 56: Level measurement on a closed tank with dry leg