Metering pumps that don't just deliver "approximately"—but dispense with reproducible accuracy
When small to medium flow rates must be precisely delivered at a defined pressure, a standard feed pump is not sufficient. Metering pumps operate with a clearly defined displacement volume, calibratable flow characteristics, and reproducible repeatability. This is precisely why they are used wherever process deviations must not be corrected by “increasing the flow rate.”
Harton Anlagentechnik GmbH therefore designs metering pumps not only based on liters per hour (l/h), but also according to the medium, pressure level, viscosity, valve dynamics, leakage requirements, and maintenance strategy.
Harton Anlagentechnik GmbH therefore designs metering pumps not only based on liters per hour (l/h), but also according to the medium, pressure level, viscosity, valve dynamics, leakage requirements, and maintenance strategy.
Why Choose Dosing Pumps from HARTON Anlagentechnik GmbH?
Our metering pumps are precisely engineered for the specific fluid, pressure, viscosity, and process requirements to ensure accurate, reproducible, and long-term stable metering.
High-quality components, application-specific design, and robust construction ensure reliable operation, long service life, and cost-effective use.
Maintenance-friendly designs enable quick service work and reduce downtime.
What applications are metering pumps designed for?
Metering pumps are used when specific volumes of fluid need to be introduced into a process in a precise, reproducible, and controllable manner.
Typical applications:
Typical applications:
- Additive dosing
- pH adjustment
- Inhibitor addition
- Process injection
- Chemical addition
- Volume-proportional dosing
- Pulse- or batch-based dosing
- Typical industries:
- Chemical
- Water and wastewater treatment
- Energy plants
- Oil & Gas
- Food technology
- OEM Dosing Systems
Why Choose Harton for Metering Pumps?
- Second-generation family-owned business since 1984
- Technical selection by our in-house engineers
- Clear distinction between diaphragm and piston metering pumps
- Focus on dosing accuracy, calibratability, and operational reliability
Our employees do not view dosing pumps as mere accessories, but rather as precise positive-displacement systems whose performance depends on the stroke mechanism, valves, fluid, and installation conditions.
Metering pumps are used when specific volumes of fluid need to be introduced into a process in a precise, reproducible, and controllable manner.
Typical applications:
Typical applications:
- Additive dosing
- pH adjustment
- Inhibitor addition
- Process injection
- Chemical addition
- Volume-proportional dosing
- Pulse- or batch-based dosing
- Typical industries:
- Chemical
- Water and wastewater treatment
- Energy plants
- Oil & Gas
- Food technology
- OEM Dosing Systems
Diaphragm Metering Pumps
In diaphragm metering pumps, the fluid is separated from the drive by a diaphragm. This design is particularly suitable for:
Technical advantage: The pump head remains hermetically sealed from the drive, making it significantly easier to control leakage than with open piston systems.
- corrosive fluids
- toxic media
- Applications with strict leakage requirements
- defined HSE requirements
Technical advantage: The pump head remains hermetically sealed from the drive, making it significantly easier to control leakage than with open piston systems.
Piston Metering Pumps
Piston metering pumps operate using direct piston displacement. They are the preferred choice when:
Technical difference: The sealing design requires more maintenance; however, the pump’s strengths lie in its pressure range and direct piston hydraulics.
- higher pressures are required
- defined high-pressure metering is required
- the medium allows for the seal design
Technical difference: The sealing design requires more maintenance; however, the pump’s strengths lie in its pressure range and direct piston hydraulics.
Single-head and multi-head models
Metering pumps can be designed as:
The dosing capacity is adjusted via:
- Single-head pump
- Multi-head metering pump
- Pump module for multiple dosing
- Pump-side base for dosing stations
The dosing capacity is adjusted via:
- mechanical stroke adjustment
- Speed control
- combined stroke and speed control
The following values are design ranges. In the project, they are narrowed down to the medium, pump head, and pressure range.
| Dosing Capacity | 0.001 to 1,027 l/h |
| Dosing Pressure | 1 to 25 bar in the standard range (diaphragm pressure can be significantly higher depending on the project; piston pressure can also be higher) |
| Media temperature | -20 to +200 °C |
| Ambient temperature | -20 to +60 °C |
| Viscosity | 0.5 to 100,000 mPa·s |
| Dosing Accuracy | typically ±0.5 to ±3% |
| Repeatability | calibrated to approximately ≤ ±1% |
| Stroke frequency | 10 to 300 strokes per minute |
| Gas content | 0 to 5 vol.% |
| Solid content | 0 to 0.05% by weight |
| Power Consumption | Approx. 0.05 to 0.75 kW, depending on the model |
| Pulsation | Included as standard; damping optional |
The values listed apply to lower pump capacities. For higher flow rates, pressure ratings, or special configurations, please request a project-specific design.
Media, Valve Dynamics, and Dosing Behavior
Metering pumps operate accurately only when the fluid and the pump's hydraulic system are compatible. Flow rate alone is not a sufficient selection criterion.
Chemically aggressive media
Acids, alkalis, and oxidizing agents may only be used if their compatibility has been confirmed with:
be designed.
- pump head
- Diaphragm or packing
- Valve seat
- sealing system
be designed.
Solvents and media containing VOCs
Media containing solvents can affect seals, elastomers, and, in some cases, explosion protection. In such cases, an additional ATEX assessment is required.
High-viscosity fluids
Increasing viscosity changes:
As a result, the actual metering capacity shifts if the load condition is not clearly defined.
- Valve opening behavior
- Pressure loss
- Fill level of the pump chamber
- Stroke dynamics
As a result, the actual metering capacity shifts if the load condition is not clearly defined.
Gas Content and Shear-Sensitive Media
Gas-laden media can affect dosing accuracy. Shear-sensitive media require a controlled stroke frequency to prevent product degradation caused by unnecessary stress.
Media containing solids
Solids are generally a major cause of wear in metering pumps. They are permitted only within defined limits, as valves, seating surfaces, and seals are sensitive to them.
Materials and Durability
The choice of materials determines the corrosion resistance, leak-tightness, and service life of metering pumps.
Typical pump head materials:
Typical sealing materials:
Piston and plunger components are designed to be wear- and corrosion-resistant, depending on the pressure level and medium.
For hygienic applications, additional surface requirements can be accommodated on a project-specific basis.
Typical pump head materials:
- PP
- PVDF
- PTFE
- Stainless steel AISI 316
- Typical membrane materials:
- Multi-layer PTFE membrane
- FKM-coated membrane
- Chemically compatible specialty elastomers
Typical sealing materials:
- EPDM
- FKM
- PTFE
- FFKM
Piston and plunger components are designed to be wear- and corrosion-resistant, depending on the pressure level and medium.
For hygienic applications, additional surface requirements can be accommodated on a project-specific basis.
Tightness, Safety, and Interfaces
The major technical difference between diaphragm and piston metering pumps lies not only in the pumping principle, but also in their approach to leakage.
Diaphragm Design
Diaphragm metering pumps achieve a specified leakage target by separating the fluid from the drive. For critical applications, double-diaphragm systems with leakage monitoring can be used.
Piston Design
Piston metering pumps are available with either a packing seal or a mechanical seal. In this context, leakage characteristics, maintenance intervals, and sealing strategies must be explicitly defined.
Protective Features
Safety-related issues include:
- system-level overpressure protection
- Pressure monitoring
- Process-side dry-run protection
- Diaphragm rupture monitoring (for applicable models)
- Vent and calibration ports
Drives, Control, and Automation
In metering pumps, the drive technology determines not only energy consumption but also, directly, the controllability.
Typical drive concepts:
Typical control strategies:
Sensor options:
Typical drive concepts:
- Electric motor with eccentric or crank mechanism
- Servo drive
- Controlled stroke mechanism
Typical control strategies:
- Stroke adjustment
- Speed control
- Combined stroke/speed control
- Interfaces to the control system:
- 4-20 mA
- 0-10 V
- Pulse input
- Fieldbus
Sensor options:
- Pressure monitoring
- Temperature monitoring
- Stroke monitoring
- Power or current monitoring
Installation, Connections, and Peripherals
Dosing pumps must be integrated in such a way that they remain calibratable and accessible for maintenance.
Key points:
Key points:
- Connection standards according to DIN EN, ANSI, or customer-specific
- Defined suction and discharge connections
- Reliable venting and draining
- Adequate access for replacing diaphragms, packings, or valves
- Typical peripherals:
- Pulsation dampener
- Safety valve / relief valve
- Dosing tank
- Agitator
- Level sensor
- Calibration cylinder
- Check valve
- Temperature control and heating systems may be required if viscosity or crystallization behavior are temperature-dependent.
Monitoring, Calibration, and Operational Safety
During operation, metering pumps must not only deliver the desired flow but also maintain reliable, reproducible performance. That is why the combination of monitoring and calibration is crucial.
Typical monitoring functions:
Typical monitoring functions:
- Pressure monitoring
- Temperature monitoring
- Diaphragm rupture monitoring
- Current and power monitoring
- Alarm and Shutdown Logic
- Key Operating Parameters:
- Calibration Intervals
- Stroke count limits
- Temperature range
- Pressure limits
- Availability and control stability depend heavily on whether these values are maintained in the actual process.
Quality, Testing, and Documentation
Dosing pumps are delivered on a project-specific basis along with the necessary documentation.
Typical test points:
Typical test points:
- Functional test
- Dosing accuracy test
- Leak test
- Scope of documentation:
- Data Sheet
- General Assembly
- Spare Parts List
- Operating Instructions
- Conformity documentation
- Ex certifications, if required
- The standard documentation is included in the standard scope of the offer and delivery.
Project Management, Delivery, and Operating Costs
Unlike a purely product-based analysis, the entire life cycle must be taken into account when considering metering pumps.
Project Management
- Coordination with Purchasing, Process Engineering, Maintenance, and Electrical Engineering
- Clarification of interfaces with tanks, piping, sensors, and control systems
- Defined acceptance criteria for pressure, temperature, and dosing deviation
- Risk analysis for overpressure, gas content, valve wear, and leakage
Delivery and Installation
- Assembled, partially disassembled, or packed for shipping
- Commissioning optional
- Replacement parts for diaphragms, valves, packings, and seals
TCO
The main cost drivers are:
- Energy
- Replacement parts
- Calibration costs
- Downtime
- Maintenance Interval
Products
Piston Metering Pumps
Piston metering pumps meet a variety of technical requirements. Depending on pressure conditions, product properties, and hygiene standards, distinct areas of application emerge.
Diaphragm Metering Pumps
Diaphragm metering pumps are particularly suitable when the medium and the drive must remain reliably separated from one another or when corrosive liquids are being pumped. Whether electric or pneumatic—the specific process requirements are always the deciding factor.
Microteeth Ring Metering Pumps
Microteeth-ring metering pumps are the ideal solution for very small flow rates and high repeatability. The technical focus is on precise micro-metering, stable control performance, and exact precision mechanics.
Peristaltic Dosing Pumps
Peristaltic metering pumps offer advantages when the fluid is to come into contact with only one wear part. This effectively reduces the load on the hydraulic system, particularly when handling abrasive or chemically aggressive fluids.
Gear Metering Pumps
Gear metering pumps are suitable for precise pumping applications based on the volumetric principle. Depending on the model, the technical design focuses on pressure characteristics, fluid properties, and lubricity.
Types and Models of Our Dosing Pumps
We offer a wide range of metering pumps for a wide variety of media and applications. Whether diaphragm, piston, chemical, gravimetric, volumetric, or hygienic metering pumps—we provide precise and reliable solutions that are precisely tailored to your process requirements. Our metering pumps are known for high metering accuracy, maximum process reliability, and dependable operation across numerous industries.
Batch Dosing Pumps (Batch Pump)
Batch metering pumps dispense fluids in predefined batches. These pumps are particularly well-suited for processes in which different quantities of various fluids must be mixed with precision. This type of metering is widely used in the food and chemical industries.
| Accuracy | ±0,1 - 1 % |
| Operating Mode | Batch |
| Media | Liquids, Chemicals |
| Temperature | -10 bis +120 °C |
| Controls | Recipe Control, SPS |
| ATEX | optional |
| Dosing capacity | 0,01 - 10.000 l/h |
Chemical Dosing Pumps
Chemical metering pumps are specifically designed for metering corrosive chemicals such as acids and alkalis. They are constructed from durable materials to ensure precise metering under extreme conditions.
| Materials | Stainless steel, PVDF |
| ATEX | optional |
| Dosing capacity | 0,1 - 2.000 l/h |
| Pressure | up to 16 bar |
| Media | Chemicals, corrosive liquids |
| Viscosity | 1 - 200.000 mPa·s |
| Temperature | -10 to +100 °C |
Gravimetric Dosing Pumps
Gravimetric metering pumps measure the weight of the medium being dispensed and adjust the flow rate accordingly. They offer extremely high metering accuracy and are therefore ideal for the pharmaceutical and chemical industries, where precise and reproducible metering is required.
| Dosing capacity | 0,1 - 5.000 l/h |
| Accuracy | ±0,05 - 0,5 % |
| Media | Liquids, paste-like media |
| Temperature | -20 to +60 °C |
| ATEX | optional |
| Operating Mode | Batch |
| Controls | Load Cells, SPS |
Sanitary Dosing Pumps (FDA / EHEDG)
Sanitary metering pumps are designed for the pharmaceutical and food industries, where the highest standards of hygiene and product purity are required. These pumps comply with FDA and EHEDG standards and are CIP- and SIP-capable to ensure that no contamination occurs.
| ATEX | optional |
| Dosing capacity | 0,1 - 2.000 l/h |
| Accuracy | ±0,5 - 1 % |
| Pressure | up to 16 bar |
| Media | Food, Pharmaceuticals |
| Temperature | 0 bis 150 °C |
| Materials | Stainless Steel 1.4404 |
| Cleaning | CIP/SIP |
| Surface | ＜ 0,8 µm |
Piston Metering Pumps (Piston Pump)
Piston metering pumps use a piston mechanism to deliver the fluid precisely and at high pressure. These pumps are ideal for applications that require high flow rates and precision, such as in the pharmaceutical, food, and chemical industries.
| Temperature | -20 to +200 °C |
| Materials | Stainless steel, PTFE |
| ATEX | optional |
| Dosing capacity | 0,1 - 1.500 l/h |
| Pressure | up to 100 bar |
| Accuracy | ±0,2 - 1 % |
| Media | Viskos, Oils, Suspensions |
| Viscosity | 10 - 100.000 mPa·s |
Diaphragm Metering Pumps (Diaphragm Pump)
Diaphragm metering pumps use an elastic diaphragm that separates the fluid from the drive unit. This type of pump is particularly well-suited for the precise metering of corrosive or toxic fluids, as the diaphragm completely isolates the fluid. They are commonly found in the chemical industry and are used for dosing reagents or additives in process systems.
| Media | chemical liquids, aggressive media |
| Viscosity | 1 - 200.000 mPa·s |
| Temperature | -10 to +150 °C |
| Materials | Stainless steel, PTFE, PVDF |
| ATEX | optional |
| Dosing capacity | 0,1 - 2.000 l/h |
| Pressure | up to 40 bar |
| Accuracy | ±0,5 - 2 % |
Mobile / Skid-Mounted Metering Pumps
Mobile metering pumps are designed for flexible use in a variety of applications. They come fully pre-assembled and offer a solution that is quickly ready for use in metering operations on construction sites or in changing processes.
| Pressure | up to 25 bar |
| Media | Liquids, Viskos |
| Controls | integrated |
| Materials | variable |
| ATEX | optional |
| Dosing capacity | 0,1 - 3.000 l/h |
| Mobility | high |
Polymer Metering Pumps
Polymer metering pumps are specifically designed for metering high-viscosity, shear-sensitive, and sticky fluids, such as polymer solutions used in water treatment or the plastics industry. These pumps ensure a precise and controlled delivery of polymer substances.
| Dosing capacity | 0,1 - 1.000 l/h |
| Viscosity | up to 1,000,000 mPa·s |
| Pressure | up to 20 bar |
| Media | Polymers, viscous liquids |
| Temperature | 0 to +60 °C |
| Controls | SPS |
| Materials | Stainless steel |
| ATEX | optional |
Positive-Displacement Metering Pumps
Volumetric metering pumps operate at a fixed volume per stroke or revolution. These pumps are particularly efficient for continuous processes in which the exact flow rate must be maintained at a constant level, such as when metering additives and fillers in chemical production.
| Temperature | -20 to +150 °C |
| Materials | Stainless steel, Plastic |
| ATEX | optional |
| Dosing capacity | 0,1 - 10.000 l/h |
| Accuracy | ±1 % |
| Pressure | up to 40 bar |
| Media | Liquids |
| Viscosity | 1 - 200.000 mPa·s |
Relevance for Engineers and Technical Buyers
A metering pump is designed based on metering capacity, operating pressure, fluid properties, viscosity, temperature, material compatibility, metering accuracy, as well as requirements for controllability, leak-free operation, and maintenance intervals.
When it comes to technical procurement, the key factors include, in particular, the flow range, maximum dosing pressure, materials of components in contact with the medium, dosing accuracy, repeatability, drive type, interfaces, as well as available certifications and spare parts concepts.
Depending on their application, metering pumps must meet the relevant machinery, pressure equipment, and safety requirements; in addition, material-, fluid-, or industry-specific tests and inspections in accordance with customer specifications may be required.
FAQs by Industry
Select an industry
Metering Pumps in Automotive Manufacturing: High-Viscosity Application
Metering Pumps in Chemical Process Engineering: Corrosive Media
Metering Pumps in Pharmaceutical Filling: Sterile Precision
Metering Pumps in Food Production: Hygiene & Flow Rate
Dosing Pumps in Water Treatment: Continuous Dosing
Dosing Pumps in Laboratory Automation: Analysis & Microdosing
Submit a request now!
For personalized advice and customized solutions that meet your needs.
Inquiry Form - Metering Pumps
Request:
Dosing pumps
We will be happy to contact you.
Inquiry form