Qdos Peristaltic Chemical Metering Pumps | Watson-Marlow

Qdos LogoQdos Peristaltic Metering Pumps - Accurate, Versatile Chemical Pumps

Qdos metering pumps offer accurate, linear & repeatable flow under varying process conditions (even fluctuating pressure levels to 7 BAR). Additionally there are no valves, making the Qdos easier to use than most diaphragm metering pumps. Maintaining the pump is simple with the ReNu pumphead, pull the old one out and put the new one in and your done. Calibration is also simple and quick with a digital readout to remove all guesswork from the process.

Qdos, Peristaltic, Chemical, Metering Pumps, Watson-MarlowFlow rates have now doubled in the Qdos range

  • Cut chemical cost through higher accuracy metering

  • Simple drop-in installation eliminates ancillary equipment

  • Reduced maintenance with single, no-tools, component replacement

  • Range expanded to include Qdos 60. Flow rates from 0.1 to 1,000 ml/min (0.001 to 15 USGPH) at 7 bar (100psi)

Cost of ownership is less than that of a diaphragm pump

Qdos pumps deliver flow rates that remain constant right up to 7 bar (100 psi) giving users a unique advantage over diaphragm metering pumps. Designed as a drop in replacement to diaphragm pumps, the Qdos peristaltic metering pump offers long maintenance intervals, reducing the impact of process downtime and lowering the overall cost of ownership.

Qdos, Peristaltic, Chemical, Metering Pumps, Watson-MarlowFeatures

  • Cut chemical cost through higher accuracy metering

  • Simple drop-in installation eliminates ancillary equipment

  • Reduced maintenance with single, no-tools, component replacement

  • Range expanded to include Qdos 60. Flow rates from 0.1 to 1,000 ml/min (0.001 to 15 USGPH) at 7 bar (100psi)

ReNu Pumphead Technology

Revolutionary ReNu pumphead technology is at the core of the Qdos pump. This ensures the delivery of accurate and repeatable flow for fluids of wide ranging viscosities. Process uptime is maximised by facilitating quick, safe and easy pumphead removal and replacement, with no need for tools, no specialist training and no maintenance technicians. The contained pumphead design with integral leak detection reduces wastage and eliminates operator exposure to chemicals.

Eliminate Ancillary Equipment

A diaphragm metering pump often requires a range of high maintenance ancillary items to function. The Qdos pump eliminates ancillary equipment while ensuring accurate, linear and repeatable metering across all process conditions.

  • No backpressure valves

  • No pulsation dampener

  • No degassing valves

  • No foot valves and strainers

  • No float switches

A Host Of Applications


Flocculants can cause clogging in diaphragm pumps, increasing maintenance and process down-time.

Environmental conditions such as temperature affect fluid viscosity also affect diaphragm pump performance.

Qdos peristaltic metering pumps deliver accurate metering even with fluctuating viscosity. The powerful suction capability eliminates the need for a day tank or specialist piping schemes. There are no seals or valves in the flow path to clog or wear, meaning pump performance is never compromised.


Sodium hypochlorite creates gas locking and crystallisation in diaphragm pumps.

Flow rates and pressure changes fluctuate impacting metering accuracy. Diaphragm pumps are often set to ‘over-dose’ to ensure water quality is maintained. This increases chemical usage and secondary treatment to compensate.

Qdos peristaltic metering pumps deliver predictable, accurate metering at variable pressure up to 7 bar (100 psi), even with fluctuating process conditions. Gas locking and crystallisation issues are eliminated.

Mineral processing - Reagent dosing

Reagent metering requires high accuracy to optimise yields.

Qdos peristaltic metering pumps deliver linear and accurate metering across the flow range, improving efficiency of flotation cells and leading to increased mineral yields.

The toxicity of reagents such as sulphuric acid and cyanides are hazardous and can damage pumps. ReNu pumphead technology ensures the safe containment. Rapid no-tools maintenance means an operator can quickly and safely change the pumphead.

pH adjustment - Industrial water treatment

Water pH influences the effectiveness of disinfection.

Accurate pH control is critical to meet water standards and ensure process continuity. Metering alkalis such as Calcium Hydroxide creates issues with clogging and damage. Metering acids carries safety implications and can corrode pipework and equipment.

Qdos peristaltic metering pumps minimise pH ‘overshoot’. Suspended solids are handled with no risk of clogging. Operator safety is ensured with the ReNu pumphead, a single safely-contained component for rapid no-tools maintenance.

Qdos Peristaltic Chemical Metering Pumps Brochure

York Fluid Controls Limited, York, Fluid, Controls, Limited

Liquid Handling Equipment Specialists Since 1960

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Established in 1960, York Fluid Controls Limited is a leading stocking distributor of fluid transfer and process pumps, positive displacement and centrifugal pumps, liquid filtration, valves, mixers and tanks. York offers an extensive range of services, including a complete repair and test centre, an engineering department, custom fabrication, and a machine and assembly shop. York serves organizations of all sizes and from all industries, throughout Canada. Reliability, service excellence, a desire to solve customers' problems and the highest ethical standards underpin this family-owned company and all that it does. Learn More


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