Dry running is a common problem in pumps. It can lead to serious damage to components, especially the rubber parts of the stator. In this blog post, you will learn how our customer, a manufacturer of cavitation pumps, successfully solved this problem by implementing an advanced temperature monitoring system using the JUMO miroTRON electronic thermostat. We explain what dry-running is, the problems caused by rising temperatures in pumps and the benefits of using our solution. Read on to discover how to protect your pumps from thermal damage and avoid downtime and costly repairs!
Dry-running occurs when the pump operates without sufficient fluid. In this situation, internal components such as the impeller continue to move, which generates a significant amount of heat. Normally, the fluid flowing through the pump serves as a cooling medium to dissipate the excess heat. Without cooling, the temperature in pumps quickly rises to levels that can be dangerous to their structure.
Elastomeric winding parts are particularly sensitive to high temperatures. As a result of dry running, the rubber components can degrade, leading to cracking, delamination or complete destruction. Damage to these components not only shortens the life of the pump, but can also lead to sudden pump failure.
Prolonged dry running can also damage other parts of the pump, such as seals, bearings and housings, which are not designed to withstand extreme temperatures. Consequences can include component seizure, fluid leakage and mechanical failure. It is therefore crucial that appropriate safeguards are in place, such as temperature monitoring systems and automatic pump shutdown.
We have implemented a solution at our customer, based on the JUMO miroTRON electronic thermostat with PID function, which effectively protects pumps against dry running. During pump operation, the stator surface temperature is continuously monitored by the protection system. When the temperature exceeds the setpoint, the thermostat sends a signal to the motor controller, which causes the pump to shut down immediately. A temperature rise, caused by dry running, is quickly detected, preventing damage to the impeller and stator. In addition, the system allows a second setpoint temperature to be set, providing additional protection. This is particularly useful during cleaning processes when the temperature of the medium can vary. With this solution, the pumps are protected from thermal damage, which increases their reliability and reduces repair and downtime costs.
For the early detection of drops in the level of water or another medium in the pump, we also recommend a level probe, in particular the JUMO ZELOS C01 capacitive level sensor designed, among other things, to prevent dry running.
Electronic thermostats of the JUMO miroTRON series
My name is Ewelina Szmit and I have been working in content marketing for several years, combining my professional skills with my passion for writing. I am convinced that even the most technical topics can be presented in an interesting and accessible way for everyone. Outside of work, I unleash my creativity by creating newspaper collages. I like to spend my free time being active, walking my dog or running.
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