Analyze the common faults of pressure gauges and their main reasons.

At present, pressure gauges are widely used in the instrument industry, and can be applied to different products in almost every field. With the expansion of the market, we produce a variety of products, and we will study the types of products needed by our customers one by one, thus increasing the types of products and customer needs. With the increase of product types, instruments and meters in use often have some minor faults. Today, we will analyze the common faults of pressure gauges and their main reasons.

A, pressure gauge instructions are not allowed.

1. Due to the influence of temperature, the trap tube is not installed, and high-temperature steam or high-temperature liquid directly enters the spring tube. Besides being under pressure, it is still elongated due to temperature, which increases the spring action and the error.

2. One of the effects of vibration is the vibration of the measured gas, liquid or the measured mechanism; One is the vibration of the internal mechanism of pressure gauge. As a result of vibration, the gear of the pressure gauge is worn and deformed, the hairspring is disordered, the pointer is loose, the bearing is damaged, etc., so that the pressure gauge loses accuracy and even is damaged.

3. Influence of overload The pressure gauge often indicates a range of more than 2/3 of the dial, resulting in insufficient elasticity or permanent deformation of the spring tube after long-term use, thus affecting the accuracy.

4, other influence pressure gauge into dirt and impurities; Not adjusted and verified; Poor management or damage.

Second, the pointer does not refer to the zero position.

1. The spring bent pipe loses its elasticity (straightness).

2. The hairspring loses its elasticity and falls off.

3. The passage of the three-way cock, the connecting pipe of the pressure gauge or the trap pipe are blocked.

4. The pointer is bent or stuck.

Third, the pressure gauge pointer jitter

1. The hairspring is damaged, and the combination bolt of the connecting rod and the sector gear is not active.

2. The two ends of the central shaft are bent, and the two ends of the shaft rotate eccentrically when rotating.

3. The passage of the three-way cock of the pressure gauge or the trap pipe is partially blocked or covered by the gasket.

Four, the pressure gauge pointer does not move

1. The three-way cock is not opened or the position is incorrect.

2. The three-way cock, pressure gauge or trap channel is blocked.

3. The joint between the pointer and the central shaft may be loose or the pointer may be stuck.

4. The joint of the spring tube and the watch base leaks.

5. The shaft of the sector gear may be loose, disengaged and unable to drive the pinion.

Five, the pressure gauge surface fuzzy or water droplets.

1. There is a leak in the spring elbow of the pressure gauge.

2. The spring elbow is poorly welded with the support, resulting in leakage.

3. There is no rubber gasket or rubber pad on the joint surface between the watch case and the glass plate, which makes the watch case and the glass plate seal badly.

The reason why the measuring pointer in the pressure gauge is interrupted

When the pressure gauge is in use, people sometimes find that the pointer of the instrument suddenly becomes shorter. If you look closely, it turns out that the pointer of the pressure gauge is half missing. The interruption of the pointer is a very serious fault, which makes the pressure gauge lose its basic function-displaying the pressure value.

The pressure gauge pointer is interrupted for the following two reasons:

Generally speaking, the pointer is interrupted because the pointer material is too soft and the rigidity is poor. After a certain impact, the pointer is bent in a light way, but it is interrupted in a heavy way.

Due to improper operation of the field staff, such as excessive pressure relief. So that the pointer hits the nail back at a very fast speed, and the pointer is interrupted after repeated times.

If the pressure gauge pointer is interrupted, the main responsibility should be the manufacturer. The rigidity of the pressure gauge pointer is too poor, or the prompt is insufficient (users should be reminded to install a pressure damper or a pressure overpressure protector when measuring special pressure in a specific environment) and so on.

When the pointer of the pressure gauge is interrupted, the user should first contact the factory to determine the reason for the interruption of the pointer (the reason is determined at this time to ensure the safety of other instruments purchased in the same batch). If it is the manufacturer's fault, the pointers of other pressure gauges should be checked in time. If it is used improperly, the user should correct it in time.

When the pressure gauge manufacturer purchases the pressure gauge pointer material, it must meet the requirements in the drawing design, the brand must be correct, and the mechanical properties must be qualified, especially the rigidity. If the materials in the domestic market can't meet the design requirements, we should use the materials imported from foreign countries, or negotiate with users to select other materials or terminate production. The user of the pressure gauge shall operate in strict accordance with the requirements in the instruction manual of the pressure gauge, and if necessary, a pressure damper or a pressure overpressure protector can be installed to protect the pressure gauge pointer from damage.

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