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Magnetostrictive static level SZY20
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 displacement of anchor plug body
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  • Product parameters
  • Specification parameter
  • Ordering considerations
  • Precautions for use
  • Common problem
  • Proposal

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:


Application fields:
  • Water level measurement and monitoring of tunnel and Bridge

  • Water level measurement and monitoring of fire wells and pools

  • Intelligent fire control

  • Smart city

  • Reservoir dam

  • Agricultural irrigation

Model designation:
PT500-SZY21-100mm-RS485
PT500: general quantity category
Szy21: Specification and model
100mm: displacement range
RS485: output signal


Main technical parameters of pt500-szy20 magnetostrictive static level:
Range: 0 ~ 100mm; 200mm; 300mm;
Comprehensive precision: ± 0.1mm;
Nonlinear: ≤ 0.05% FS
Repeatability: ≤ 0.002% FS (min ± 1 μ m)
Output signal: rs485-rtu
Update frequency: 10Hz
Power supply voltage: 24VDC (9 ~ 30VDC)
Working current: <50ma (varying with range)
Service life: ≥ 1million times
Insulation impedance: ≥ 1000 m Ω /100vdc
Ambient temperature: -40 ~ 70 ℃
Humidity / dew point: humidity 90%, no condensation
Temperature coefficient: <30pp/c
Electrical connection: M12 waterproof electrical connector
Process connection: 10mm liquid pipe quick connector
Protection grade: IP67
Connecting cable: five core shielded cable, standard length: 1m
Overall dimension: 80*80*275
Float specification: 304 stainless steel, 52 diameter large floating ball
Applicable medium: water or antifreeze and other random liquids (depending on the ambient temperature of the application installation area, ensure that the liquid does not freeze)

Product structure size:
Product power supply 24VDC (range: 9-30vdc);
It is strictly forbidden to remove the outer tube of the product (since the outer tube and the lower seat are sealed with sealant, it is possible to install liquid leakage after removal);
The power and signal wires shall be wired correctly according to the specifications of the ordered products;
The unused end of the electrical connector must be screwed with a cap;
The range of liquid level height must be within the range of measuring range;
During on-site installation, it is recommended to use metal or plastic pipe protection for cable and liquid pipe protection;
If there is no liquid in the product, please replenish it in time;
Horizontal installation of products;
For outdoor installation, it is recommended to install the product in the protective box;

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