1、 Introduction:
Pressure transmitterIt mainly consists of three parts: pressure sensors (also known as pressure sensors), measurement circuits, and process connectors. It can convert the physical pressure parameters of gases, liquids, etc. sensed by pressure sensors into standard electrical signals (such as 4-20mADC, etc.) to supply secondary instruments such as indicator alarms, recorders, regulators, etc. for measurement, indication, and process adjustment.
2、 Main advantages
1Pressure transmitterHas the characteristics of reliable work and stable performance;
2. V/I integrated circuit, with few peripheral components, high reliability, simple and easy maintenance, small size, light weight, and extremely convenient installation and debugging;
3. Aluminum alloy die-casting shell, three end isolation, electrostatic spray protection layer, sturdy and durable;
4. 4-20mADC two-wire signal transmission, strong anti-interference ability, long transmission distance;
5 LED、LCD、 The pointer has three types of indicator heads, making on-site reading very convenient. Can be used to measure viscous, crystalline, and corrosive media;
6. High accuracy and stability. In addition to the imported original sensors that have been laser corrected, fine compensation is provided for the comprehensive temperature drift and nonlinearity of the entire machine within the operating temperature range.
3、 Verification method:
1. InstallationPressure transmitterLoosening often occurs when connecting the transmitter to the three valve group, and the bolts should be tightened diagonally. Generally, they cannot be locked at once. When installing the three valve group, the sealing coil should be encrypted.
2. Correctly connect the receiver operator, set the transmitter content according to requirements, and adjust the zero position.
3. Set the function items of the calibrator. First, reset the calibrator to zero, connect the pressure pipeline, and pay attention to the positive and negative pole connections. Connect the standard resistor. Check the circuit current.
4. Accuracy verification of pressure transmitter: Place the fine adjustment valve in the middle position, close the shut-off valve and the check valve, set the output pressure of the electric pressure inspection table, calibrate the basic error (5 points up and 5 points down), and record the data in a timely manner.
5. For the operation of the three valve group: first open the balance valve and correctly open the high-pressure valve.
6. Equipment reset and organization: deactivate the three valve group, power off, remove circuit connections and related equipment, start and close the pressure control console, open the shut-off valve and check valve.
7. Accurately calculate errors and backlash, provide correct verification conclusions, and provide correct verification conclusions.