Differential Pressure Level Solutions Bulletin 01C25A04-01EN-Y

Differential Pressure Level Solutions Liquid tank level is one of the basic measurements used in process plants but, its importance cannot be overstated. Incorrect high levels can cause the vessel to overflow leading to lost product, a safety hazard, or an environmental problem (or all three). Incorrect low levels can burn out pumps. Incorrect level measurement can cause problems with inventory control. There are many different technologies available, but, the most widely employed is differential pressure. Yokogawa differential pressure level solution uses an easy to understand principle, field...

Benefits of DPharp Sensor Yokogawa's DPharp digital Pressure transmitters set a new standard for high performance, safety and robustness. • High Accuracy • Long Term Stability • Safety as Standard • Multi-sensing • Fast Response Models Yokogawa liquid level transmitters are available with two different performance tiers and three types of process connections. The EJA-E series is Yokogawa's primary product line. An evolution of Yokogawa's original DPharp transmitters, this series provides the performance and ruggedness that is expected from Yokogawa. The EJX series is Yokogawa's premier product...

Typical Applications Level Measurements with Tank Blanketing Density Measurement Incorrect level measurement can cause the tank to overflow leading to lost product, safety hazards, environmental problem, or burn-out pumps, or errors in inventory control. Changes in temperature or variations in composition of the liquid being measured in the tank can cause a change in density. Since density is a critical part of the level measurement, we need to able to measure it. By mounting a pressure transmitter on two fixed position taps on the tank, the density can be calculated. Both tabs would need to...

Challenges and Solutions Ambient Temperature Effects Temperature can have a major impact on the accuracy of pressure transmitters, especially those using diaphragm seals attached via capillaries. As temperature changes, fill fluid in the capillaries change density. This density change causes a Zero Shift leading to an inaccurate level measurement. This effect gets worse as the length of the capillary increases. Yokogawa’s DPharp transmitters have three different solutions, fill fluid density compensation, compensating capillaries, and digital remote sensors to overcome this problem. Fill Fluid...

Digital Remote Sensors Digital Remote Sensor (DRS) Traditional differential pressure measurements using capillaries have reduced performance when the capillaries are longer. There comes a point when the performance of the traditional system is no longer good enough for the measured parameter to be useful. Yokogawa’s DRS can solve this problem. DRS uses two individual pressure sensors; one placed on the high-pressure tap and the second placed on the lowpressure tap. The two sensors communicate via a dedicated communication cable. The system uses the information from the two sensors to derive the...

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