Magnetostrictive static level PT500-szy20 settlement monitoring
Magnetostrictive static level is a kind of precision instrument based on the principle of connecter. By measuring the relative changes between the liquid level of several interconnected liquid tanks installed at the measured point and
the liquid level of the liquid tank at the measuring base point (fixed point), it deduces the settlement changes of the relative positions of the installation positions of each liquid tank.
Settlement is a slow process. In any short period, the change reflected in the liquid level of the liquid storage tank will be very subtle. Whether this small change can be detected in real time and accurately, reflecting the small
settlement of the foundation, and achieving prevention is the key to measuring the quality of a static level product, which is the reality of the liquid level sensor integrated in the system Timeliness and precision put forward extremely
high requirements. As it is installed outdoors, the temperature coefficient, water resistance and lightning protection of the liquid level sensor are key technologies. In addition, the installation size and replaceability of the static
level are also important technical indicators.
Problems of traditional liquid level gauge Due to the limitations of traditional measurement technology, in the past, most static level instruments used inductive level meters based on LVDT principle (and a few products used expensive
optical solutions based on CCD camera), but inductive level meters have a series of defects, such as low sensitivity, low measurement accuracy, large temperature coefficient, large installation size, and difficult to replace.
Advantages of magnetostriction Technology:
High sensitivity, high precision, good repeatability, high reliability, high protection, minimal temperature coefficient, small and compact installation size, easy installation, strong anti electromagnetic interference ability, cost-
effective and durable.
Pt500-szy20 magnetostrictive static level is mainly used:
Settlement monitoring of rail transit subgrade and subway support wall;
Monitoring the settlement of mountains and buildings on the upper part of the tunnel;
Settlement monitoring of subgrade, slope and pier of expressway;
Settlement monitoring of foundation pit, nuclear power plant and hydropower station;
Foundation settlement monitoring of dams, water conservancy projects and high-rise buildings;
Safety management of bridges, foundations and tunnels;
Master the environment, traffic, structural stress, deformation and other parameters of the monitored object;
Real time evaluation of bridge working conditions and prediction of bridge function changes;
Evaluate the signs and trends of structural performance degradation, so that the management and maintenance unit can take maintenance measures in time;
Measure the sinking state of the support and the change of the expansion joint; Measure the displacement of anchor plug body;
Measurement principle and installation:
The static level system, also known as the connecting pipe level, is composed of at least two observation points, and each observation point is equipped with a set of static level. The liquid storage containers of the static level are
completely connected with each other with liquid pipes, and inert liquid is injected into the liquid storage container. When the liquid level is completely static, the liquid level in all connected containers in the system should be on
the same geoid. At this time, the liquid level of each container is measured by the sensor, that is, the initial liquid level values are H10, H20, H30, H40 respectively
As shown in the figure:
Settlement calculation:
Assuming that measuring point 1 of the measured object is used as the reference point, the foundation of measuring point 2 sinks, the foundation of measuring point 3 rises, the foundation of measuring point 4 remains unchanged, etc. when
the liquid level in the system reaches equilibrium and stands still, a new level vi0 is formed, then the new liquid level values in the connecting container of each measuring point are: H1, H2, H3, H4, and the liquid level changes of
each measuring point are calculated as:
△h1=H1-H10 △h2=H2-H20
△h3=H3-H30 △h4=H4-H40
If the fixed measuring point 1 is selected as the reference point, the vertical displacement (settlement) of other measuring points relative to the reference point is:
△H2=△h1-△h2 △H3=△h1-△h3 △H4=△h1-△h4
As shown in the figure:
