ESM-11V seepage measurement system consists of a submersible cylinder and level sensor to monitor the water head developed over the V-notch weir. Change in level changes the buoyancy on the cylinder that is measured by a highly sensitive vibrating wire sensor. V-notch weirs are additionally available on request if specifically asked for.
| Level Sensor | |
| Range (mm wc) | 300, 600, specify |
| Accuracy | ± 0.1 % fs |
| Non-linearity | ± 0.5 % fs |
| Temperature limit | -20° to 80°C |
| Thermistor | YSI 44005 or equivalent |
