Features and benefits
Proven and versatile
The DMX pump range has proven its worth in dosing applications worldwide. With their robust diaphragm-based design and their high-quality motors, DMX pumps require minimum maintenance and are the best choice for many dosing applications. The DMX range is highly versatile: it covers a wide flow range and offers a variety of dosing head sizes, materials and accessories.
Accurate dosing – all the time
The diaphragm design makes sure that the dosing flow fluctuation and the linearity deviation are very low. This allows very precise dosing of chemicals – as much as necessary, as little as possible.
Smooth and low-pulsation dosing
Sophisticated drive technology and gear kinematics ensure smooth and low-pulsation dosing. This means less stress to all system components, such as tubes and valves, and leads to longer service intervals for the entire system.
Compact design saves money and space
DMX pumps are available in different dosing head sizes. The compact design allows placing several pumps right next to each other in confined spaces. Double-head versions (DMX models 226 and 227) offer a very cost-efficient way to save space or to dose two different chemicals. The extra capacity offered by double-head versions can also be used to gain higher flow rates for a single chemical.
Perfect material selection for housing and liquid-wetted parts
The models DMX 221 have PPE housings offering chemical resistance and all the protection necessary for many applications. The models DMX 226 and DMX 227 have a robust cast-aluminium housing with epoxy coating to meet all application needs. Investment costs and running costs for spare parts are kept low over the years: A wide choice of materials for dosing head, valves and accessories allow selecting exactly the degree of chemical resistance required. All liquid-wetted parts need to be resistant to the chemicals used. The diaphragm is made of NBR and PTFE-coated.
Motors to match application needs
For applications with specific motor requirements, the versatile mechanical dosing pump range offers the following
options:
• Ex-classified or ATEX-certified high-quality motors
• Motors with integrated variable frequency drive (VFD) are available on request.
Mechanical dosing pumps equipped with a motor with factory-mounted integrated VFD provide extended capacity
range and functionality. They include analog inputs and outputs, an integrated potentiometer for precise and easy
setting of speed, control and self-monitoring functions as well as an interface for field bus communication (Profibus,
Profinet).
This option is only available for pumps that are able to run at 100 Hz. See performance data tables.
• Motors with PTC, prepared for operation with external variable frequency drive (VFD).
Mechanical dosing pumps equipped with a motor with PTC, planned to be operated by a VFD, the VFD is not supplied with the pump. The PTC protects the motor against locked-rotor conditions, continuous overload and high ambient temperature.
– Use a VFD that can operate at constant torque. The VFD should have a 150 % overload capacity for 60 seconds.
– Respect the limitations on minimum and maximum operating frequency to prevent gear breakdown or motor overheating. See performance data tables.
This option is not available for pumps selected for ATEX. For more detailed information, please contact Grundfos.
