Users’ Manual
ESM-12S Digital seepage monitoring system
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1 INTRODUCTION
1.1 ESM-12S seepage monitoring system
The Encardio-rite model ESM-12S seepage monitoring system is designed for precision measurement and
monitoring of water level in weirs, tanks and reservoirs and seepage in dams.
Quantity of water seeping through, around or under a dam is of great importance in analysing structural
behaviour of a dam. For measuring seepage, the drain water is taken through collection channel(s) for
discharge into the downstream of dam. The collection channel/channels are terminated in a collection
chamber where the discharge is accurately measured with a ‘V’ notch and a water level measurement
system.
In order to measure discharge over the weir accurately, the head over the weir is measured with model
ESM-12S seepage monitoring system. The system mainly consists of a low range digital pressure sensor
(with SDI-12 interface or Modbus output) inside a perforated pipe. The pressure sensor has a vented cable
and a signal cable. The vent tube is terminated in a moisture trap. The vent being open to atmosphere
helps to compensate the barometric fluctuations automatically.
To monitor water head, the pressure sensor position is kept submerged in water lower than the vertex of
weir. Any change in water level results in change in water head, which is measured by the pressure sensor.
To avoid water level variations caused by waves, turbulence or vibration, the water level head should be
measured in a stilling well-constructed upstream of the weir in the collection channel.
The digital pressure sensor is connected to Encardio-rite model ESDL-30 datalogger directly for remote
online monitoring. ESDL-30 datalogger is a compact datalogger that can be mounted easily near the sensor
or in a control room in close vicinity. The system can also be directly connected to RF nodes and gateway
communication network for wireless data transfer.
The configuration of the system with datalogger as well as with node and gateway is user friendly, which
makes the commissioning of digital seepage monitoring system quite easy and fast. Data from the
datalogger or from gateway can be transmitted remotely to a central/cloud server via mobile network.
Real-time seepage data helps in observing the behaviour of leakage in dams, especially after construction,
and indicates potentially dangerous conditions that may adversely affect stability of the structure. The
authorities can learn instantly from the alerts, in case any value crosses pre-defined limits. This allows one
to take timely decisions, increase safety and save costs.
Encardio-rite seepage monitoring system can be supplied with a stainless steel V-notch weir, if ordered
separately, to monitor rate of flow of water.
1.2 Conventions used in this manual
WARNING!
Warning messages calls attention to a procedure or practice, that if not properly followed
could possibly cause personal injury.
CAUTION:
Caution messages calls attention to a procedure or practice, that if not properly followed may
result in loss of data or damage to equipment.
NOTE:
Note contains important information and is set off from regular text to draw the users’ attention.
1.3 How to use this manual
This users’ manual is intended to provide you with sufficient information for making optimum use of vibrating
wire sensor in your application.
To make this manual more useful we invite your valuable comments and suggestions regarding any
additions or enhancements. We also request you to please let us know of any errors that you may find
while going through this manual.
