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Common faults and handling methods of capacitive pressure transmitters
When it comes to capacitive pressure transmitters, many people may feel a bit unfamiliar. However, if we mention Rosemount transmitters, many people are likely to be more familiar. In fact, Rosemount transmitters are capacitive pressure transmitters. The sensitive components of the measurement part of the capacitive pressure transmitter use a fully welded structure, while the electronic circuit part employs wave soldering and connector installation methods, making the overall structure robust, durable, and with very few failures. However, no matter how good a pressure transmitter is, after prolonged use, it is inevitable that various faults may occur. Today, the technical editor from Shaanxi Huibo Electromechanical will introduce the common faults of capacitive pressure transmitters and their handling methods.
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2022
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Fault issues and solutions for abnormal output signals of Rosemount transmitters.
In the daily production process, we may encounter issues with the output signal of the Rosemount transmitter. For example, when we apply pressure to the Rosemount transmitter, the output does not change; then, when we apply more pressure, the output suddenly changes, and during depressurization, the zero point of the Rosemount transmitter cannot return. This is actually a relatively common fault phenomenon. So why do these problems occur? Today, the technical editor from Shaanxi Huibo Electromechanical will explain the issues related to abnormal output signals of the Rosemount transmitter and their solutions.
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How to install a mass flow meter and what aspects should be noted during installation?
The mass flow meter continuously measures the flow of the medium being tested, and the measurement results are displayed in weight engineering units such as kilograms or tons. The mass flow meter cannot control the flow; it can only detect the mass flow of liquids or gases and output the flow value through simulated voltage, current, or serial communication. However, the mass flow controller is an instrument that can both detect and control.
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Common fault phenomena and treatment methods of industrial thermocouples
Correctly using industrial thermocouples not only allows for accurate temperature readings to ensure product quality but also saves on the material consumption of thermocouples, thus saving costs while ensuring product quality. Besides common errors caused by reversed compensation wires, incorrect usage, and loose connections (solution: correctly use compensation wires and tighten the terminals), incorrect installation, thermal conductivity, and time lag are also major errors encountered during the use of thermocouples.
08
Fault analysis and handling methods of thermistor temperature measuring instruments
Common faults of industrial thermoresistors are open circuits and short circuits. Generally, open circuits are more common due to the fine wire of the thermoresistor. Open circuits and short circuits are easy to identify; using a multimeter set to the "×1Ω" range, if the measured resistance is less than R0, there may be a short circuit; if the multimeter indicates infinity, it can be determined that the resistance element has an open circuit. Short circuits in the resistance element are generally easier to handle, as long as the length and thickness of the resistance wire are not affected, one can locate the short circuit and dry it out to enhance insulation. Repairing an open circuit in the resistance element usually requires changing the length of the resistance wire, which affects the resistance value, so it is better to replace it with a new resistance element. If welding is used for repair, it must be verified as qualified before it can be used.
07
What functions are supported by the Rosemount 644 temperature transmitter?
The Rosemount 644 temperature transmitter is the most cost-effective temperature transmitter in the Rosemount transmitter temperature series. It is versatile and can use HART®, FOUNDATION™ fieldbus, or PROFIBUS® protocols, with options for top, field, or rail mounting styles, as well as various housing options. Today, the technical editor from Shaanxi Huibo Electromechanical will explain in detail what functions the Rosemount 644 temperature transmitter supports.
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In this series, we will introduce the pressure transmitters commonly used in our working conditions.
Pressure transmitters generally refer to pressure transmitters and differential pressure transmitters, mainly composed of pressure sensing elements, measurement circuits, and process connections. They can convert the received pressure signals from gases, liquids, etc., into standard current and voltage signals (4~20mADC) for secondary instruments such as indicators, recorders, and regulators for measurement, indication, and process adjustment. Pressure transmitters can be divided into general pressure transmitters (-100Pa to 120MPa) and micro differential pressure transmitters (0.1 to 1.5kPa) based on the measurement range.
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What is the difference between Rosemount temperature transmitters 248 and 644?
As we all know, Rosemount 248 and Rosemount 644 are both temperature transmitters produced by Rosemount Company, and they have been widely used in various industrial fields. But what is the difference between these two Rosemount temperature transmitters? Today, a technical editor from Shaanxi Huibo Electromechanical will introduce the differences between the Rosemount temperature transmitters 248 and 644. In fact, the most direct difference between them is that the Rosemount 248 does not have a liquid crystal display, while the 644 has a liquid crystal display. This can be directly identified from their appearance.
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