Precautions for installation and use of differential pressure transmitter
The pressure guiding tube connecting the differential pressure transmitter to the source should be as short as possible, typically ranging from 3 to 50 meters. The inner diameter of the tubing must not be smaller than 8 mm. Additionally, the tube should have a slope of at least 1:10, meaning that for every 10 meters horizontally, there should be a vertical difference of 1 meter. This slope is essential for proper drainage and gas venting. When the measured medium is a gas, any condensate formed in the gas should be able to flow back along the tube toward the process piping or equipment. Therefore, it's ideal to install the transmitter at a higher position relative to the pressure source. If this isn't feasible during installation, a liquid trap and drain valve should be placed at the lowest point of the line to prevent accumulation. For liquid media, any gas that forms within the liquid must also be directed back to the process piping or equipment. To achieve this, a gas trap and bleed valve should be installed at the highest point of the pressure guide. In such cases, the transmitter should be positioned lower than the pressure source. Overall, ensuring the correct slope and orientation of the pressure guide tube is crucial for maintaining a single-phase flow—either gas or liquid—within the system. This helps ensure accurate measurements and avoids errors caused by mixed-phase conditions. When dealing with steam, a condensing vessel must be installed in the pressure guiding line to protect the transmitter from damage caused by high-temperature vapor. The condenser should be arranged so that the condensate levels in both lines remain equal over time. Once the condensing vessel is in place, the pressure guiding line should be installed according to the same standards as those used for liquid media. For corrosive media, isolation devices should be included in the pressure guide to prevent damage to the transmitter. In cases where the medium has high viscosity, tends to precipitate, crystallize, or has a low phase transition temperature, additional isolation measures are necessary to avoid blockages in the pressure line. These precautions help maintain the integrity of the system and ensure reliable operation. **Precautions When Using Differential Pressure Transmitters** There are three key points to consider when using differential pressure transmitters: 1. Before use, the transmitter must be recalibrated to check its measurement range, zero drift, accuracy, and static pressure error. 2. After installation, verify the working pressure, temperature, measuring range, and drift of the transmitter against actual conditions. If discrepancies are found, identify the cause and make corrections before commissioning. 3. When starting up or shutting down the system, take care to avoid applying one-sided static pressure to the transmitter. To prevent this, a three-valve assembly is typically installed above the transmitter. It consists of two shut-off valves (one for high pressure, one for low pressure) and a balancing valve. The balancing valve protects the transmitter and allows for easier zero adjustment during startup and shutdown. When starting the transmitter, open the balancing valve first, then slowly open the high and low-pressure valves. Once both are fully open, close the balancing valve. When stopping the transmitter, open the balancing valve first, then close the high and low-pressure valves one by one. This sequence prevents the transmitter from being subjected to excessive static pressure. For transmitters using a sealing fluid or cold gel, this method also helps avoid contamination or damage. By following these guidelines, you can ensure the safe and accurate operation of your differential pressure transmitters, reducing the risk of failure and improving long-term performance.
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