Indication error occurs when the pressure gauge readings do not match the actual values. There are two main types: linearity error and nonlinear error. Linearity error can be caused by misalignment of the pointer or a change in gear ratio. If the error remains consistent across all pressure levels, it's likely due to the pointer being off. To fix this, remove the pointer and reposition it accurately under a known pressure value. However, if the error increases proportionally with pressure, the issue is likely related to the gear ratio. Adjusting the indication adjustment screw can correct this. If the error grows as pressure increases, move the adjustment screw to the right (down) to increase the short arm length of the sector gear, thus reducing the transmission ratio. If the error decreases, reverse the direction to increase the ratio.
Nonlinear error, also known as curve error, occurs when the reading doesn’t follow a proportional relationship with the applied pressure. Instead, the error may shift from positive to negative or vice versa. This typically happens when the pointer’s rotation angle during full stroke differs from the scale angle on the dial. To correct this, adjust the angle between the connecting rod and the sector gear. Rotating the mechanism clockwise or moving the free end outward can increase the angle, while rotating counterclockwise or pulling the free end inward reduces it. These adjustments help align the pointer more accurately with the scale.
Irregular errors occur when the pressure gauge shows random positive or negative deviations. These are often caused by damaged internal components or a deformed spring tube. In such cases, replacing the affected parts or the entire spring tube is necessary. Proper diagnosis and targeted repairs are essential for accurate readings. When adjusting a spring tube pressure gauge, it's crucial to analyze the root cause and apply the appropriate solution for optimal performance.
Calibrating a spring tube pressure gauge is vital to ensure accurate and reliable pressure measurements. Pressure gauges used in industrial processes must meet quality standards, and any unqualified units should be discarded. Calibration must follow the verification procedures outlined in the "Verification Procedure for General Spring Tube Pressure Gauges" (JJG52-1999) issued by the State Administration for Market Regulation. This article focuses on two key aspects of the calibration process.
The allowable absolute error is calculated based on the accuracy class of the pressure gauge. It is determined by taking a percentage of the measurement range. For example, a 1.5-grade pressure vacuum gauge with a range of -0.1 MPa to 0.6 MPa has an allowable absolute error of (0.1 + 0.6) × 1.5% = 0.0105 MPa. This helps determine whether the gauge meets the required precision standards.
Soft starters are widely used to improve motor starting performance. Their primary goal is to reduce starting current while maintaining sufficient torque, ensuring a smooth and energy-efficient start-up. Modern soft starters, such as the all-digital AC motor soft starter from American AB Company, offer digital control, modular design, and multiple functions. They are suitable for a variety of applications and work well with peripheral power meters. The range settings, such as 4/3 or 3/2, should be carefully checked to ensure compatibility.
In conclusion, spring tube pressure gauges are compact and cost-effective, but they play a critical role in industrial operations. Despite their small size, they require careful selection, regular inspection, and proper calibration to maintain safe and efficient production. Paying attention to these details ensures accurate measurements and prevents potential failures that could impact the entire system.
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