Milton Roy CENTRAC Series Accurate Metering Pump

CENTRAC metering pumps are engineered to operate with the highest level of performance and accuracy.

Product Description

The CENTRAC series of metering pumps from Milton Roy are designed to provide high accuracy and responsiveness in a variety of applications. The pumps feature a unique constant stroke length drive mechanism and electronic variable speed drive technology, which combine to provide a steady state accuracy of +/- 0.5% over the entire turndown range. This is twice the accuracy of the standard +/- 1% of most metering pumps. Greater accuracy means better control of the treatment process and more efficient chemical usage.


In addition, the CENTRAC pumps offer a 100:1 turndown ratio, which allows them to operate over a wide range of flow rates.


  • Simple but robust design for reliability: The CENTRAC pumps have a simple but robust design that makes them reliable and easy to maintain. All moving parts are submerged in oil, which helps to protect them from wear and tear.
  • Instant response to dosage changes: The CENTRAC pumps are designed to respond instantly to changes in dosage rate, making them ideal for applications where precise dosing is required.
  • Precise feedback signal: The CENTRAC pumps provide a precise feedback signal, which can be used to monitor the pump’s performance and ensure that it is operating correctly.
  • Efficient drive sizing: The CENTRAC pumps are designed with efficient drive sizing, which helps to reduce energy consumption and operating costs.
  • Mates with advanced HPD liquid end for maximum performance: The CENTRAC pumps can be mated with advanced HPD liquid ends for maximum performance. The HPD liquid ends are designed to provide high accuracy and reliability in a variety of applications.
  • Economical duplex configuration availability: The CENTRAC pumps are available in an economical duplex configuration, which can provide redundancy and increased uptime.
  • Compact design with a higher capacity in a small footprint: The CENTRAC pumps have a compact design that takes up very little space.
  • Low maintenance: The CENTRAC pumps require very little maintenance, making them a cost-effective solution for many applications.
  • Self-priming: The CENTRAC pumps are self-priming, which means that they can be started without any priming fluid. This is a convenient feature for applications where priming fluid is not available or is difficult to obtain.
  • Multiple safety features: The CENTRAC pumps are equipped with multiple safety features, such as a low-flow alarm and a high-pressure shutoff valve. These features help to protect the pump and the system from damage.


  1. Capacity range between 0.45 gph minimum to 550 gph maximum
  2. Discharge pressures up to 9,000 psi (CENTRAC S), 1,575 psi (CENTRAC B)
  3. Maximum stroking speed at 162 spm
  4. ± 0.5% steady state accuracy over 100:1 turndown ratio
  5. Simplex or duplex configurations



Water and wastewater treatment. CENTRAC pumps are ideal for water treatment applications because of their proven accuracy, responsive design, and capability to dose a variety of chemicals over a wide range of flow rates. These reliable, low maintenance metering pumps provide efficient dosing and reduce chemical costs.