A stilling well may be used along with the transmitter inside the tank. Stilling-well is a pipe external to the sensor probe and float encasing the entire assembly protecting it from surface agitation or from physical damage due to the length of the sensor probe. A depiction of a transmitter with a stilling well is provided below.

Optional Features that are available with the LTM-350 but NOT the LTM-250are:

1.HART Protocol, which enables:

a.A second digital output proportional to an interface level (requires a second float of different specific gravity)

b.A digital temperature output that reflects the liquid temperature.

c.Advanced diagnostics and features highly beneficial for commissioning, troubleshooting or monitoring.

Up to two floats may be used with the LTM-350 only. The second float will typically sense the interface level (the heavier of the two fluids) in the tank. The specific gravity of the second float will be such that it can be totally immersed in the lighter fluid. The drawing below shows a transmitter with dual floats, one for total level and the other for interface level (also available with various process connections).

Figure 4. Transmitter with a Stilling-well

When a stilling well is used, care should be exercised when installing the tube to center it in the chamber so that the float can freely travel the entire length of the probe. Stilling wells are required for transmitters over 10 feet or the instrument cannot be considered under warranty.

Figure 5. Dual Output Transmitter

A dual output transmitter is also available in a gage mount configuration. Consult factory for further details.

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Emerson 350, 250 operation manual Transmitter with a Stilling-well
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350, 250 specifications

Emerson 250 and 350 are cutting-edge products that represent a significant leap in automation technology and process control systems. Designed with a focus on versatility, reliability, and efficiency, these systems are tailored to meet the demands of various industries, including manufacturing, oil and gas, and chemical processing.

One of the standout features of the Emerson 250 and 350 is their advanced control algorithms. These algorithms enable precise control of processes, allowing for enhanced stability and improved operational efficiency. By optimizing real-time decision-making, the systems can adapt to variable operating conditions, thereby reducing downtime and enhancing productivity.

The Emerson 250 and 350 are equipped with intuitive user interfaces that streamline operation and monitoring. These interfaces provide operators with easy access to critical data and insights, facilitating informed decision-making. The systems’ graphical displays and touch-screen capabilities enhance user experience, making it easier to configure settings and respond to alerts promptly.

Moreover, both models are built with robust communication protocols, ensuring seamless integration with existing infrastructure. This adaptability enables businesses to leverage their current investments in technology while expanding their automation capabilities. The systems support various communication standards, including OPC, Ethernet/IP, and Modbus, ensuring they can connect effortlessly to other devices and databases.

Another key characteristic of the Emerson 250 and 350 is their scalability. Designed to grow alongside a business, these systems can be expanded or modified to accommodate increasing operational demands. This flexibility is critical in today's fast-paced industrial environment, where agility and responsiveness are paramount.

In terms of reliability, the Emerson 250 and 350 boast rugged designs that withstand the harsh conditions often present in industrial settings. With features like enhanced environmental resistance and fail-safe mechanisms, these systems ensure continuous operation and minimize the risk of failures, providing peace of mind for operators.

In summary, the Emerson 250 and 350 stand out with their advanced control algorithms, user-friendly interfaces, robust communication capabilities, scalability, and reliability. These characteristics make them ideal solutions for businesses aiming to improve automation and process control while adapting to the ever-evolving demands of the industrial sector.
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