Specific operation steps of fine adjustment of pressure transmitter

1. Modulus fine-tuning (sensor fine-tuning)

The main work to be done is complete fine-tuning and zero-point fine-tuning. Complete fine-tuning requires three times the accuracy of the transmitter. Please operate it in the menu of the mobile operator: equipment settings-> diagnosis and maintenance-> inspection-> fine-tuning of the lower limit transmitter.

If the accuracy of the transmitter is 0.25, then the lower limit fine-tuning value is 0.06. In the whole operation process, we only need to follow the instructions provided by the hand operator, and then adjust the upper limit sensor fine-tuning at the same position. Note that the upper limit fine-tuning should not exceed the zui large measuring range of the transmitter.

2, zero fine-tuning

Firstly, the transmitter should be vented to the atmosphere, and connected with the measuring loop by using the hand operator. Then, after equipment setting-> diagnosis and maintenance-> inspection-> sensor fine adjustment-> zero point fine adjustment, zero point fine adjustment should be carried out as prompted by the hand operator.

It should be noted that the transmitter must be within 3% based on zero before it can be fine-tuned at zero.

When fine-tuning, we need to turn OFF the transmitter protection setting. Generally, the transmitter protection setting is a red switch directly in front of the meter, and the state is ON and OFF. If the protection function is turned on, fine-tuning will not succeed.

3, digital-analog fine-tuning (output fine-tuning)

In the operator menu, set the equipment-> diagnosis and maintenance-> inspection-> output fine tuning-> digital/analog fine tuning.

Set the "control loop" to manual mode. Then according to the "connection reference table", connect an accurate reference ammeter to the transmitter, pay attention to the positive and negative terminals, and then select OK. After zui, set the on-site device output to 4ma, and the transmitter output is 4ma at this time. Then record the actual value of the reference table, and input the value in the "input instrument value" prompt, and observe that the output of the hand operator is consistent with the reference table value.

If not, continue to input the reference value and check whether it is consistent with the output of the hand operator;

If they are consistent, change 4ma to 20ma, and then compare the reference value with the output value of the communicator until it is accurate.

The last step is to set the "control loop" to automatic control, and then complete all operations.

Design of pressure switch and sensor

Nowadays, with the rapid development of electronic technology and information technology, pressure measurement and automatic control technology have penetrated into various fields of scientific research and engineering technology. As one of the control methods of pressure, pressure switch is not limited to the on-off two-state control of pressure at a certain point, but on the basis of pressure switch control, it is necessary to distinguish the pressure and set the control points continuously.

The development of pressure switch sensor is to miniaturize and integrate the mechanical pressure switch and pressure sensor with single function, so that they can provide switching signals and continuous electrical signals in the same pressure chamber at the same time. The development of the pressure switch sensor should break through the key technical difficulties such as integrated structure, small sensor design and mechanical pressure switch, and solve the comprehensive technology involving multiple disciplines.

The sensor adopts an integrated structural design, and the small pressure sensor and the mechanical pressure switch are installed in the same pressure cavity, sharing the same pressure interface and signal connector, which can provide step signals and continuous electrical signals at the same time. The pressure switch sensor has compact structure, high accuracy, high overload factor and reliability, small contact action error and temperature coefficient, and its overall performance is higher than that of single functional products.

In order to realize the requirement of integrated structure of mechanical pressure switch and sensor, they must be located in the same pressure cavity. If there are no restrictions on size and weight, the sensor and pressure switch only need to be arranged in parallel. However, in a small structural space, we plan to install the sensor and the pressure-sensitive diaphragm of the pressure switch face to face in the same pressure cavity and share the same pressure interface and signal connector. Can synchronously feel the pressure transmitted from the outside, and provide step-by-step signals and continuous electrical signals at the same time. The shell of the structure is made of stainless steel, and the whole design adopts solid hard connection. The sensor structure has no moving parts by argon arc welding, resistance welding and electron beam connection, which strengthens the sensor's compression, vibration and impact resistance characteristics.

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