Monitoring devices for maximum operational safety
Condition monitoring for hermetically sealed pumps
HERMETIC monitoring devices
HERMETIC monitoring devices enable the continuous monitoring of key operating parameters of hermetic centrifugal pumps. They detect critical operating conditions at an early stage and help to prevent damage to the pump and motor, as well as safety risks to people, the environment and the plant.
Thanks to HERMETIC’s ZART® (Zero Axial and Radial Thrust) technology, hermetic centrifugal pumps operate in a hydrodynamically and hydraulically balanced manner and are wear-free when used as intended. However, proper functioning can be compromised by incorrect operation or unforeseen events.
Temperature, rotor position and direction of rotation monitoring systems support early fault detection, enhance operational and process safety, and make a significant contribution to compliance with safety requirements, particularly in hazardous explosive areas.
Advantages
EARLY DETECTION OF PROBLEMS
Anomalies are detected before any damage or failures occur.
GREATER SAFETY
Monitoring safety-related parameters minimises operational risks and enhances process safety.
FEWER DOWNTIME PERIODS
Early warnings help to prevent damage and unplanned plant downtime.
A HOLISTIC PROTECTION STRATEGY
Tailored monitoring solutions for safe and reliable pump operation.
Level monitoring to protect the pump from dry running
For safety reasons, the internal chamber or rotor compartment of a Canned Motor Pump must be filled with the pumped liquid at all times. HERMETIC offers a suitable level monitoring system for every pump, which complies with the explosion protection requirements set out in Directive 2014/34/EU.
However, level monitoring is also recommended for applications without explosion protection requirements. It prevents the pump from running dry and protects against serious damage, for example to the slide bearings or caused by excessively high temperatures resulting from a lack of cooling and lubrication flow.
Equipment used
Temperature monitoring to prevent excessively high temperatures
Temperature monitoring ensures that the pump is switched off if temperatures rise to impermissibly high levels. HERMETIC offers a suitable temperature monitoring system for every pump, which complies with the explosion protection requirements set out in Directive 2014/34/EU.
Monitoring the liquid temperature enables reliable control of the permissible operating range and the required motor cooling. For pumped media with a solidification point above ambient temperature, it can also prevent the pump from being started before the permissible pumping viscosity is reached.
To protect the canned motor, either PTC thermistors or resistance thermometers PT100 are used in the motor winding.
Equipment used
Rotor position monitoring to protect against axial wear
The axial thrust of a pump is influenced by various factors, including the operating mode, the system conditions and the properties of the pumped medium. Rotor position monitoring enables the early detection of critical deviations and monitors the axial shaft position of the rotor during operation in a contactless and hermetic manner.
In combination with fill level and temperature monitoring, it supports efficient early fault detection and contributes to the operational safety of the pump.
Equipment used
Rotation direction monitoring to prevent incorrect phase sequences
With hermetic centrifugal pumps fitted with a canned motor, it is not possible to check the direction of rotation from the outside. An incorrect phase sequence can therefore cause damage to the pump without this being noticed.
To ensure the correct direction of rotation is reliably detected, the pumps are fitted as standard with an electronic direction-of-rotation monitor.
Equipment used
Brochure available for download
You can download the product information on monitoring devices for hermetic centrifugal pumps with canned motors here:
The right solution for your application
Whether you’re setting up a new system, carrying out a modernisation or have a specific project enquiry: our experts will advise you on selecting the right HERMETIC pump for your requirements.