Process Measurement

Answer: The TCF series is designed with advanced signal processing and high-sensitivity measuring tubes, allowing it to accurately capture the low mass flow rates typical of gases like hydrogen. Its robust design also ensures stable performance under high-pressure conditions often required for complex gas applications.

Answer: The flowmeter measures the phase difference between two parallel tubes. Even when there is no flow, false phase differences can occur due to residual pipe stress, temperature variations, or installation stress. Zeroing records this inherent deviation so it can be automatically deducted during operation. Ensure the pipe is completely filled with fluid, valves are fully closed, and the temperature is stable before performing a zero calibration

Answer: Oxygen is a strong combustion-supporter. If high-speed oxygen flows encounter impurities or protrusions inside the pipe, the resulting friction heat can potentially ignite the pipeline itself. For safety, flow velocities must be strictly limited based on the pipe material and operating pressure (e.g., lower limits for higher pressures). Stricter limits apply if the flow directly impacts obstacles like valves or elbows.

Answer: Measuring gases with a Coriolis flowmeter is inherently more challenging than measuring liquids. The TCF series overcomes these challenges and achieves exceptional gas measurement accuracy through an advanced Triple-Compensation System:

• Temperature Compensation: Temperature fluctuations alter the material properties of the measuring tube. The TCF series compensates for this via built-in sensors, and coupled with advanced structural design, it minimizes the temperature effect on accuracy to as low as ±0.00015% of the maximum flow rate per °C.
• Pressure Compensation: Changes in process pressure can cause microscopic variations in the stiffness and shape of the measuring tube. The TCF series allows for fixed or dynamic pressure compensation (e.g., via PLC/DCS) to effectively eliminate these errors.
• Sound Velocity Compensation: This is the most critical factor for gases. Unlike incompressible liquids, gases are highly compressible, meaning the gas's center of mass does not vibrate perfectly in sync with the measuring tube. This causes deviations in vibration characteristics and errors in mass and density readings. Our sound velocity compensation algorithm corrects this phenomenon, drastically enhancing gas measurement precision.

Answer: Electromagnetic flowmeters require a conductive fluid to cut magnetic lines of force. When the pipe is not full, the electrodes are exposed to air and cannot generate a signal, prompting the meter to issue an "Empty Pipe Alarm". This is a protective mechanism indicating that the fluid is insufficient and the current measurement is not reliable.

Answer: No, TVF vortex flowmeters are not suitable for measuring liquid ammonia. The housing of the TVF series is manufactured using a casting process. Cast materials inevitably have tiny internal pores, which limits their corrosion resistance and anti-permeability, making them unsafe for handling special media like liquid ammonia.

Answer: 4-20mA is the foundational analog signal widely used in process control. HART is an enhanced version that superimposes a digital signal on top of the 4-20mA analog loop, allowing for extra diagnostic data transmission without interfering with the analog value. RS-485, on the other hand, is a purely digital communication standard. Practically, 4-20mA and HART are ideal for point-to-point connections, whereas RS-485 is best suited for multi-device bus networks.

Answer: Yes, our products meet rigorous explosion-proof standards, including both Intrinsic Safety (ib) and Flameproof (db) certifications. They are designed to operate safely in explosive gas atmospheres and dust environments, complying with international safety declarations.

Answer: Low-power transmitters should ideally use a two-wire setup, which shares power and signal on the same pair of wires, saving wiring and costs. High-power or analytical instruments require a four-wire setup, which uses separate circuits for power and signal transmission.

Answer: Because poor accuracy can be corrected through calibration (by adding an offset), whereas errors caused by poor repeatability are random and difficult to correct. In custody transfer and process control, stable measurement is more important than absolute accuracy.