Application Fields: Locations where magnetic resonance imaging (MRI) scanners may be affected by interference.
Performance Specifications:
( Tested in accordance with GB/T 12190-2021 standard )
Insulation Resistance: > 3000 Ω
Ground Resistance: ＜1Ω
Relative Humidity: ≤80%
Atmospheric Pressure: 86～106 KPa
Luminosity: 100~150 lx
Shielding Performance: 10MHz～100MHz >100dB; Test method according to GB 12190-90.
Under test circuit conditions for 1000pF coupling capacitors, the background noise is <2pC.
Lighting Power Supply Filters: 25A/220V, 2-way
Shell mechanical properties: Shielding body flatness ≤ 4 mm/M², verticality ≤ 6 mm
Two-year deformation degree: Top indentation ≤8mm, Bottom indentation ≤3mm
Shielded Housing
The lifespan of the shielding body is 20-30 years, and the seismic rating of the shielding shell is calculated at level 8. Considering the influence of the magnetic field.
Easy to assemble and disassemble, featuring a copper plate modular design.
NMR shielding room bottom design:
Shielding room requirements for the placement of the NMR instrument: trench size: 2.8m x 2.8m x 0.9m, other areas inside the room to be excavated: 55
3 feet below grade, use C25 concrete for pouring. Level off the poured foundation with cement sand mortar, and apply double-layered SBM waterproofing.
Treat and lay high-intensity insulating flooring, followed by the creation of a shielding ground body.
Shielding Room Shell Design: The shielding body is assembled from 0.35mm copper plate and high-quality pine wood frames (coated with fire-resistant paint). The assembled modules are interconnected...
Multi-layer copper mesh pads, secured with M6*100 stainless steel bolts.
Manual single-leaf shielding door, size: 1.2m wide x 2.1m high (external swing type)
Based on the on-site characteristics of the shielding room, a single-outer-opening shielding door is adopted. The shielding room door affects the overall shielding effectiveness of the shielding room.
The most critical component is the weakest link in maintaining the overall performance of the shielding system, and it is also the only movable part within the system.
Therefore, maintaining the stability of the shielding door's shielding effectiveness is particularly important. The door structure is a single-leaf swing door, with the door panel made of copper plate,
Wooden joists and stainless steel frames are welded together, with the door frame edges sealed using finger-type beryllium copper spring strips, and magnetic-free locks are used.
Observation Window: The observation window is lined with double-layered shielded glass and 30-mesh copper wire. The distance between the two copper mesh layers is 5-6 centimeters to enhance shielding.
Performance, guaranteed high clarity.
Grounding System: The grounding system of the shielding room employs a separate power grid grounding system, which utilizes insulated flooring to isolate and connect to the system's zero potential.
Ground (using a grounding filter), the grounding resistance shall not exceed 1Ω.
The waveguide windows of the balanced ventilation system in the shielding room of Poduct use fully welded stainless steel mesh for ventilation, with insertion loss consistent with the shielding room.
Refrigeration pipes and superheat relief tubes entering and exiting the isolation room are treated with stainless steel welding and tightness.
Electrical design and construction: Select power cables with appropriate wire diameters and power supply filters of various capacities based on the electrical load of each equipment.
Select a power filter with low leakage current, ensuring its insertion loss matches the overall performance of the entire shielding room; the power supply within the room is
Use conduit wiring to install power outlets according to specified locations. The power connection can output 220V voltage, accommodating the needs of various equipment. The power supply passes through a filter and enters the shielded room, requiring passage through the room's walls. At the top of the shielded room, there are electromagnetic interference-free DC LED lighting fixtures, with an illuminance of 300 lux. The illumination depends on the installation height.
Determine the spacing of lighting fixtures reasonably. Ensure uniformity of light shielding within the room. To prevent interference from lighting equipment, the fixtures are powered by a power filter in the shielding room.
Installation Specifications:
1. The moisture-proof layer is焊接seamed, with the second layer placed over the center of the first layer's seam.
2. Ground PVC boards should be laid flat, neat, free from defects, and seamless.
3. Enclosure module assembly, the dimensions must match the drawings exactly, with the wall perpendicularity error not exceeding 6mm.
4. Shield doors, observation windows, and conductive plates (with two-way suspension cables) must have a verticality error not exceeding 2.5 mm.
5. Interior wall finishes are smooth and aesthetically pleasing, with wall flatness not exceeding 4mm and wall perpendicularity not exceeding 5mm.
6. Indoor lighting circuit shielding must be constructed strictly according to the drawings; all lines must be routed through conduit, with both AC and DC entering the distribution box.
The electrical box should be clearly separated and labeled, with the red, black, and green wires for live, neutral, and ground clearly distinguished. No wires are allowed to pass through the magnet.
Pass above.
7. Equipment import must not be less than 2.8m (width) * 2.8m (height) with the bottom opening at 0 level for easy entry of the magnet.
The body should be precisely located according to the drawings.
8. Ground wire channels for non-submersible floors can be installed as exposed wire channels.
9. Shielded insulation resistance less than 1KΩ.
10. Operate strictly in accordance with the customer's construction progress and quality standards.
Decorating Plan
The ceiling is constructed with micro-perforated aluminum ceiling tiles (600*600), both the main and secondary rafters are made of aluminum, and they are not magnetic.
2. The walls are finished with porous wooden sound-absorbing panels, offering both noise reduction and aesthetic appeal.
3. The ground is first treated with an epoxy self-leveling compound to ensure flatness, durability, and strength. Subsequently, plastic (PVC) is then laid down.
Trimming for skirting boards。
