Product Introduction:
The gate opening (Hall magnetic grating) displacement sensor is one of the varieties of the gate opening instrument series products of Hubei MIRAN Technology Co., Ltd. The gate opening (Hall magnetic grating) displacement sensor is an external installation, mainly composed of Hall sensors and measuring rods. The Hall sensor is 1300mm long and equipped with a guide sleeve. The cable is led out from the rear, and the guide sleeve is fixed and installed on the oil cylinder using a clamp type mounting seat; The measuring rod is installed inside the guide sleeve, with a length slightly larger than the measurement stroke. The front of the measuring rod is connected to a universal joint bearing and a measuring rod mounted on the lifting ear at the front end of the oil cylinder. As the oil cylinder expands and expands, the measuring rod also moves correspondingly inside the guide sleeve. The Hall sensor senses the gate opening signal. According to the convention of hydraulic engineering, when the piston rod is fully extended, the opening is "0" millimeters, and when the piston rod is fully retracted, the opening is "biggest".
Application fields and characteristics of gate opening (Hall magnetic gate) displacement sensors:
Suitable for measuring the opening of various gates and displacement of oil cylinders in the water conservancy industry
Suitable for working environments with vibration and motion
● Highly waterproof and sealed, with a protection level of IP68 ● Resistant to harsh environments and strong corrosion resistance
● Absolute value output ● Multiple signal outputs available for selection
● Anti polarity selection, anti static, anti lightning, anti surge, anti corrosion, anti vibration, strong anti-interference ability
Technical parameters and installation dimensions:
| Model | MKD | Working stroke | 0-15000mm |
| Resolution | 1mm | Full process linearity | ≤0.01%FS |
| Repeatability accuracy | ≤0.01%FS | Power supply | DC24V，≤100mA |
| Output | 4-20mA, RS485,SSI Serial synchronous digital model | Lightning protection | can be offered |
| Working Current | ≤50mA | Polarity protection | ≤-30VDC |
| Overpressure protection | ≤36vdc | Insulation protection | DC500V(Housing grounding） |
| working temperature | -30℃~+85℃ | Storage temperature | -45℃~90℃ |
| IP | IP68 | Vibration shock | Omnidirectional radiation±5mm,5-250HZ,50G |
| Installation direction | Vertical, inclined, horizontal | Installation method | Hoop installation (customizable size) |
| IP | IP68 | Vibration shock | Omnidirectional radiation±5mm,5-250HZ,50G |
| Material | 304 Stainless steel (fresh water); 316 stainless steel (seawater) | ||
| Electrical connectors | Waterproof joint straight lead, cable standard length 10m (length can be customized) | ||
Installation diagram of gate opening (Hall magnetic gate) displacement sensor:
Installation precautions for gate opening (Hall magnetic gate) displacement sensor:
1. Before installation, check the physical object according to the assembly drawing, familiarize yourself with the names, installation positions, and installation points of each installation component, and then refer to the drawings and installation instructions for installation. The following installation steps are routine steps. Due to different on-site environments, the installation steps and methods can be flexibly adjusted according to the actual situation;
2. If conditions permit, the gate can be opened and closed to the appropriate position for installation. Generally, fully open the gate is the best installation position. According to the installation drawings, weld the measuring rod connecting bracket to the piston rod lifting ear, and install the guide sleeve onto the oil cylinder. According to the actual situation, the installation position of the clamp does not need to be strictly installed according to the positions indicated in the drawings, but should be evenly distributed, subjected to force, and easy to install. However, the position of the guide sleeve relative to the oil cylinder cannot be changed, otherwise it will cause the sensor to be in a reading blind zone when the gate is fully closed, or the sensor will have too much reading stroke, which cannot reach the design measurement stroke after resetting;
3. Choose the installation steps based on the actual situation on site. During installation, you can first assemble the guide sleeve and clamp (use the guide sleeve clamp to assemble the guide sleeve and clamp), and then lift both onto the oil cylinder together. Alternatively, you can first install the clamp on the oil cylinder, lift the casing onto the oil cylinder, and then assemble it with the clamp. Generally, you choose to assemble it first and then lift it. When installing and lifting clamps, the opening should be oriented towards the side that is convenient for installation and fixation. Before determining the position of the clamp, do not tighten the screw. Wait until the guide sleeve is adjusted to be directly above the oil cylinder and in a straight line before fixing the screw.
4. Installation precautions: (1) The measuring rod should be marked with the "working surface" label, and the side with multiple magnetic segments should be the working surface (metal can be adsorbed). If the measuring rod is removed, it must be restored with the sensing surface facing the Hall sensor; (2) Due to the smoothness of stainless steel pipes, the ropes must be firmly fixed during lifting to prevent them from falling off;
5. After fixing the guide sleeve, move the measuring rod to the gate lifting ear. Connect the joint bearing on the measuring rod to the clamp bracket on the lifting ear. Note that the clamp on the measuring rod must be in a straight line with the guide sleeve;
6. If the gate is in a fully open or fully closed state during installation, when connecting the measuring rod, you can check whether the "full range marking line" (check when fully open installation) or "zero point marking line" (check when fully closed installation) on the measuring rod is at the pipe mouth. The marking line can slightly enter the pipe (generally within 20mm into the pipe, not too much to prevent insufficient travel), but it cannot be exposed. If the marking line is exposed at the pipe mouth, the measuring rod or guide sleeve should be adjusted so that it is not outside the pipe mouth (under the premise of ample space, adjusting the connecting clamp of the measuring rod is simple). This operation is to prevent the measuring rod from being in the blind spot position of Hall sensor detection when fully closed; If the gate is not fully open or fully closed during installation, please install according to the position marked on the drawing, align the guide sleeve with the oil cylinder installation seat, as shown in the installation drawing, and adjust the position of the clamp appropriately according to the situation;
7. Install junction boxes in appropriate locations for easy installation and wiring, and effective protection. The Hall sensor and proximity switch cables are threaded through pipes and connected to a junction box (the terminals inside the junction box are defined), and then connected to the electrical control cabinet;
8. Connect the cables to the corresponding terminals inside the control cabinet according to the installation instructions.
Gate opening (Hall magnetic gate) displacement sensor PLC debugging:
1. After the PLC is set up, the sensor can be put into use. When the gate is fully closed, the sensor usually has an initial value displayed. At this time, the PLC can reset it. When designing the sensor, there will be margin for measuring the stroke, but if the initial value is too much, the reset value may be greater than the margin, and the sensor will be unable to measure the design stroke. If it is found that it cannot measure the full stroke after the gate is fully opened, the measuring rod or sleeve needs to be adjusted to reduce the invalid measurement stroke and enable the sensor to reach the design stroke; If there is no initial value when the gate is fully closed and the data is only read after the gate is opened for a period of time, it indicates that the Hall sensor is in the blind spot position when the gate is fully closed. At this time, the gate should be fully closed. According to the method in item 6 of "Product Installation" above, use the zero point marking line as a reference, adjust the position of the measuring rod or guide sleeve to slightly enter the pipe mouth, or adjust the opening data to within 100mm according to the actual opening display on the PLC, and then reset it to zero on the PLC. Note that when opening the door for the first time, it is necessary to observe the operation status of the measuring rod throughout the entire process. If it is not in a straight line with the guide sleeve or other abnormalities occur, it should be stopped immediately for inspection and adjustment;
2. If there is looseness or replacement of the Hall sensor during installation and debugging, the sensing surface of the Hall sensor (marked on the tube body) must be facing the guide sleeve when restoring it; If the measuring rod is removed, the sensing surface (with multiple magnetic sections) should be facing towards the Hall sensor during restoration.