Users’ Manual
ESM-40S High sensitivity settlement monitoring system
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4.7 Connecting the air vent line
Each settlement sensor also has quick fitting connectors (straight, bottom ones) for connecting the air vent
tube. An 8 mm od tubing is used as the air vent tube, connecting all the sensors and finally vented to
atmosphere near the fluid reservoir through a desiccant (moisture trap) so that only dry air can enter the
sensor vent line. The moisture content in air in the transducer vent line can, in course of time, coalesce to
form water droplets and can damage the inside of the transducer
Cut the desired length of tubes and connect them to the respective quick fittings on the sensor and finally
to the moisture trap.
NOTE:
It is recommended to fix the fluid and drain tubes to the walls to prevent damage. This will
also ensure that the tubes are always below the top quick connector (bent one for fluid line).
NOTE:
Ensure to keep the drain valve of the sensors closed.
4.8 Filling the fluid in reservoir, fluid line and sensors
Once the complete system is installed, fluid will be filled into the reservoir, fluid line, reference settlement
sensor and all the installed settlement sensors.
It is recommended to use a pressure vessel and air-pump (compressor) to fill in the fluid. A typical
installation set-up is shown in figure 4-5.
1.
Fill the pressure vessel with de-aired fluid from valve (4) of the pressure vessel.
2.
Close both the valves of the pressure vessel. Place it upside down.
3.
Connect the pressure vessel to the reservoir with required length of fluid tube through outlet valve
(4).
Figure 4-5 Typical installation scheme of ESM-40S settlement system
Fluid tube
Deaired water
reservoir
Settlement
sensor #N
R
ef
er
en
ce
lev
el
h
ead
Lev
el
h
ea
d
#2
Lev
el
h
ea
d
#N
Reference
sensor
Datalogger
ESDL-30
Digital signal cable
Air vent tube
Settlement zone
Fluid reservoir level
Settlement
sensor #2
Settlement
sensor #1
T connector
Bleed screw
Air compressor
Air pipe line
2
3
Stable zone
4
5
Pressure gage with
pressure regulator
Air vent
Isolation valve
Inlet valve
Outlet valve
6
7
Vent to atmosphere
(Pressure release valve)
Pressure
vessel
Water filling system
1
Dessicant
Hydrophobic Filter
0
2
4
6
8
10
12
7
