A, pressure gauge without RF connector instructions. Reason: 1, the cut-off valve of the pressure tube not open; 2, guide pressure pipe plugging; 3, spring too much dirt deposition and blocked inside pipe joint; 4, spring pipe crack; 5, center and fan tooth wear too much, that don't mesh.
Second, the pointer jitter. Reason: 1, the pressure measured medium; 2, pressure gauge, the installation position of vibration.
GPS antenna Third, pressure gauge pointer is to beat or dull phenomenon. Reason: 1, the pointer into the surface of glass or scale friction; 2, center shaft bending; 3, two gear mesh with dirt; 4, connecting rod between the fan gear and the activities of the screw is not flexible.
Four, after the pressure is removed, Pointers can't return to zero. Reason: 1, pointer DaWan; 2, short hair spring force is insufficient; 3, a pointer is loose; 4, there is a friction drive gear.
Five, the non-uniform pressure indication error. Reason: 1, spring tube deformation failure; 2, spring tube free end and sector gear, connecting rod transmission ratio improper adjustment.
Six, transmission ratio imbalance.
Seven, directives on the low side. Reason: 1, the transmission ratio imbalance; 2, spring tube leakage; 3, pointer, or have a friction drive mechanism; 4, guide pressure pipeline leak.
Eight, pointer cannot be instructed to limit scale. Reason: 1, the transmission ratio is small; 2, the inappropriate position of movement fixed to the frame; 3, the inappropriate position of spring tube welding.
Pressure gauge calibration:
Company adopts piston type pressure gauge to do calibration tools, will be the school pressure gauge and standard pressure gauge at the same pressure compare their instructions, absolute error of the chosen standard table shall generally be less than 1/3 of the calibrated instrument are absolute error, so the error can be ignored, that standard meter reading is a real pressure values. If the calibrated instrument for a standard instrument are reading error is not RF cable assembly reater than the school, the provisions of the instrument error is considered calibrated instrument are qualified.
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