Tongue And Groove Face Flanges
The Tongue and Groove faces of this flanges must be matched. One flange face has a raised ring (Tongue) machined onto the flange face while the mating flange has a matching depression (Groove) machined into it's face.
Tongue-and-groove facings are standardized in both large and small types. They differ from male-and-female in that the inside diameters of the tongue-and-groove do not extend into the flange base, thus retaining the gasket on its inner and outer diameter. These are commonly found on pump covers and Valve Bonnets.
Tongue-and-groove joints also have an advantage in that they are self-aligning and act as a reservoir for the adhesive. The scarf joint keeps the axis of loading in line with the joint and does not require a major machining operation.
General flange faces such as the RTJ, TandG and the FandM shall never be bolted together. The reason for this is that the contact surfaces do not match and there is no gasket that has one type on one side and another type on the other side.
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1, power interference: power interference often appears in the form of surges, such as lightning or power line induced charge. It can cause the fuse to break, damage the printed circuit board, damage the bridge rectifier, etc. A complete grounding system provides good protection against power disturbances. Good grounding system can reduce the loss caused by the failure. System grounding can effectively prevent such failures. 
2. AC interference: AC interference may damage components and microprocessors. For AC power, the voltage between the neutral and ground should not exceed 02V, and its ground should be connected to the grounding pile. The best approach to this type of interference is good grounding and the use of a regulated source that filters noise.
3. Inductive interference: Inductive interference is caused by an inductor destroying the magnetic field. This interference occurs in the form of a sharp high voltage, which is much higher than the original voltage. This sharp voltage can cause various faults and cause permanent damage to the equipment. Sexual hazards. It mainly presents three forms of capacitive coupling, inductive coupling, and electromagnetic field radiation, which mainly cause common-mode interference to the circuit. The most effective way to overcome electric-field coupling interference is shielding. When shielded electric field coupling interference occurs, it is best not to connect the shield of the conductor to the local line at both ends, because in the presence of ground loop current, this will form a magnetic field in the shield and interfere with the shielded conductor. The shielding layer should be grounded at one point, and generally it should be grounded at either end. The method of suppressing the magnetic field interference is to shield the interference source. However, it is difficult to do so by shielding them with a magnetically permeable material. Therefore, it is only possible to use some passive suppression techniques to keep away from the sources of interference, and to avoid parallel lines as much as possible.
4. Radio Frequency Interference: Radio frequency interference may cause the electronic weighing device to display inaccurately. At this time, it is necessary to check whether the grounding equipment uses long and thin wires, whether the wire shielding is good and whether the filter works normally.
Electrostatic interference: Electrostatic interference is more destructive than radio frequency interference. Electrostatic interference occurs when the device is wet, and this type of interference is more common. Obvious static interference may damage the sensor and sensitive components, causing the device to shut down and show confusion. The best way to overcome this interference is equipment grounding, signal line shielding, and so on.
solution:
1. Provide a low impedance connection between the device and nearby objects to reduce the risk of personal shock.
2. Provide a low-impedance path for the return-to-power supply to the ground-fault current to allow the fuse or circuit breaker to operate.
3. Provide a low-impedance ground discharge path for lightning induced currents. 4. Provide ground discharge paths for electrostatic charges to prevent sparks or arcing. One of the grounding anti-interference techniques is to avoid the ground loop current interference, and the second is to reduce the coupling interference of the common ground impedance.
How to cut off the interference source of electronic scales
The main disturbances of electronic scales are: