What is the best gauge for measuring liquid level over a small area?

A differential pressure transmitter will work as well; as for which one is better, it depends on the type of medium and also on the type of container

Buoy tanks are generally used, while floating balls are rarely employed. Of course, it still depends on the medium conditions. For ordinary liquids, side-mounted floats can be used when the height is within 2000 mm; they are very effective. For other instruments, differential pressure types, double-flange types, and so on can be used.

Hey there upstairs, float tanks are good, but they require a lot of maintenance; they’re not like floating balls, which are basically maintenance-free. I also think that differential pressure isn’t very suitable, as it requires a lot of maintenance; especially in winter, antifreeze has to be added when using the isolation fluid. When making measurements, it is also necessary to consider whether a positive or negative transfer will occur in reality. Especially since the ones in use now are all new models, it’s very troublesome to carry out the migration. For these same two types of tables, factors such as the medium being measured, the installation location, and the on-site environment also need to be taken into consideration. So I think that where it is appropriate to use a float, it should be used as much as possible. It not only requires little maintenance, but it can also measure any type of medium. Even if it has defects, it is very easy to repair. I think the only real downside is that it’s too heavy, but for us young people it’s not a big deal. I don’t know if everyone agrees with me, but I still want to thank my brothers for their support!

First, it is necessary to consider the medium being measured; second, the accuracy requirements for the measurement; third, whether the tank being measured is sealed; and fourth, the distance over which the signal can be transmitted. For general low-volume level measurement, available options include magnetostrictive level gauges, pressure and differential pressure transmitters, submersible level transmitters, flange-mounted level transmitters, and radio frequency level transmitters. If measuring the liquid level in a sealed tank, use a magnetostrictive level gauge or an RF level transmitter ； If measuring two or more media, a magnetostrictive level gauge should be used, as it can measure the liquid level and the interface ； If measurement is to be carried out in an unsealed tank and the medium has low viscosity, pressure and submersible level transmitters can be used ； If the signal transmission distance is relatively long, it is recommended to use a magnetostrictive level gauge with digital output; other level gauges that utilize the HART protocol will experience signal distortion. Could the original poster please specify the medium to be measured and the requirements? I hope this can help you.

A double-flange differential pressure transmitter with a capillary isolation fluid can be used, resulting in very minimal maintenance requirements.

Sinking cylinders are better than floating balls; once a floating ball breaks, repair can only be carried out after shutting down operations, whereas a sinking cylinder can be repaired as long as the upstream and downstream valves can be closed. The quality of current caissons is also very good, and their performance is stable. For measuring liquid levels over a small area, a weighted tube is more stable than a floating ball.

Differential pressure, ultrasound, and radar are all excellent options, with low maintenance requirements

The liquid level in open containers is generally easy to measure. For low-range liquid levels in sealed containers, I recommend using a threaded double-flange differential transmitter, which can measure down to a minimum of 300 mm of water column. We have been using ROSEMOUNT’s 1151 or 3051 RTW threaded double-flange differential transmitters, which are also easy to relocate.

Torque-type floats work well, and require very little maintenance. :lol:victory::victory:

OP, it seems like you’ve also been working with instruments for a long time. But by providing only information on a limited range of liquid levels and asking others to discuss which measuring instrument would be suitable, do you think such discussions are meaningful? The selection of any instrument is based on certain process conditions. As for what you mean by a small range for liquid level, just how small is this range exactly? What is the measuring medium, and what are the temperature and pressure? Are there any specific requirements for measurement accuracy? None of these conditions are given; how can people make a choice? Even if a choice is given, it doesn’t have much practical meaning.

There are many available products; the client needs to clarify the cost calculations, cost-effectiveness, etc., otherwise it’s difficult to reach a decision