Classification of accuracy of pressure gauge

Pressure gauge refers to an instrument that uses elastic elements as sensitive elements to measure and indicate the pressure higher than the ambient pressure. It is widely used in almost all industrial processes and scientific research fields. It can be seen everywhere in the fields of heating pipe network, oil and gas transmission, water supply and gas supply system, vehicle maintenance factory and shop. Especially in the process of industrial process control and technical measurement, mechanical pressure gauges are widely used because of their high mechanical strength and convenient production. So, how are the grades of pressure gauges classified? Let Xiaobian show you.

Classification of pressure gauges:

1, whether the pressure gauge is accurate, it will first reflect the data in the table and precision instrument, and then compare. How close the indicated value is to the true value, it is equivalent to comparing the absolute value of the maximum error with the value of the upper limit of measurement again to get a percentage. This is judged according to the errors in the experiment.

2. For general industrial instruments in China, the pressure value is divided into four accuracy grades. Levels 1, 1.6 and 2.5 and 4. The allowable error percentages are not more than 1%, 1.6%, 2.5% and 4%.

3. In 2005, the new pressure gauge verification was introduced, and the value was more refined. On the basis of the original, more detailed data regulations have been made, such as up and down not exceeding 0.01% and 0.02%.

4. If it is necessary to choose a pressure gauge with reasonable accuracy, this requirement must be put forward according to the whole production process, the principle of economy and practicality, and the detection method, and the required accurate grade should be selected according to the allowable error of this minimum value.

What is the reason why the pointer of stainless steel shock-resistant pressure gauge falls off?

Stainless steel shock-resistant pressure gauge refers to the direct indicating pressure gauge filled with liquid in the watch case or the direct indicating pressure gauge filled with liquid and with damper in the watch case.

Reasons for pointer falling off of stainless steel shock-resistant pressure gauge;

(1) after instrument calibration, no nail needle or nail needle is not firm:

(2) The taper of the hole in the needle magazine is inconsistent with the taper of the central axis of the movement, which causes the pin to be not firm;

Shockproof pressure gauge

③ The needle magazine and needle piece are not riveted firmly, and the needle piece and needle magazine are separated due to vibration or impact;

(4) the instrument pressure relief is too fast, and the pointer repeatedly and violently hits the nail stop plate, causing the pointer to fall off;

⑤ The working environment of the instrument has a large amplitude and high frequency, and long-term work causes the pointer to fall off.

Structure principle and verification method of diaphragm pressure gauge

Diaphragm pressure gauge is suitable for measuring the pressure or negative pressure of various fluid media with certain corrosiveness, non-solidification or non-crystallization. The pressure guide system and shell of stainless steel corrosion-resistant diaphragm pressure gauge are all stainless steel, which has strong corrosion resistance. It is mainly used to measure the tiny pressure of gas and liquid in chemical, petroleum and textile industries, especially in corrosive and viscous media (non-solidified and non-crystallized). The stainless steel shock-resistant diaphragm pressure gauge is filled with damping liquid and supporting buffer device, which has good shock-resistant performance. The vibration-resistant diaphragm pressure gauge can be used to measure stably when the pressure of the measured medium has a strong pulse change or pressure shock and is often suddenly unloaded in the production process, as well as in places with large environmental vibration. The corrosion-resistant and shock-resistant diaphragm pressure gauge has the characteristics of both corrosion-resistant and shock-resistant diaphragm pressure gauges.

Diaphragm pressure gauge is mainly composed of lower connector, upper connector, elastic diaphragm, connecting rod, movement, pointer, dial and so on.

Under the pressure, the measured working medium directly acts on the elastic diaphragm, and the diaphragm elastically deforms upward (measuring positive pressure) or downward (measuring negative pressure), and the gear shaft of the movement is driven to rotate by the connecting rod mechanism fixed in the center of the diaphragm, so that the pointer indicates the measured pressure value on the dial.

calibration method

1. Verification method of indication error: The indication verification of pressure gauge shall be carried out according to the graduation line marked with numbers, and the pressure shall be gradually and steadily increased (or decreased) during verification. When the indication reaches the detection upper limit, the pressure source shall be cut off, and the pressure shall be kept for 3MIN, and then the pressure shall be steadily decreased (or increased) in reverse order according to the original verification point.

2. Return error, which is the absolute value of the allowable error in accordance with the regulations during the step-up (or step-down) and step-down (or step-up) verification for the same spot check.

3. Tap the displacement. For each point of verification, during the step-up (or step-down) and step-down (or step-up) verification, the indicated value change caused by the light watch case is not more than 1/2 of the absolute value of the specified allowable error.

4. Indication error. For each verification point, when boosting (or depressurizing) and depressurizing (or boosting) verification, the difference between the front and rear indications of the lightweight case and the indication of the standard should meet the requirements.

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