How to choose the right metering pump

How to choose the right metering pump

A dosing pump is a device that is used to inject a quantity of a liquid in a precise and controlled manner. Metering pumps are used in various applications such as water treatment, the chemical industry, agriculture, foodstuffs, pharmaceuticals and biotechnology.

In order to choose a suitable metering pump, several factors must be considered:

In order to choose a suitable metering pump, several factors must be considered:

Product type

The product to be dosed must be taken into account: the viscosity, density, corrosivity, concentration and temperature of the fluid must be considered.. Some metering pumps are not suitable for corrosive or viscous liquids, so they must be choose pumps that are compatible with the liquid to be dosed.

Required flow rate:

The required flow rate is the quantity of liquid to be dosed per unit of time. A dosing pump must be selected that can provide the required flow rate, taking into account the viscosity and density of the product to be dosed.

Injection pressure required:

The required pressure is the pressure that the dosing pump must overcome to dose the liquid. Dosing can be done by free discharge into a tank or channel (whereby if the maximum level of the dosing tank is above the dosing point, a back pressure valve must be installed to avoid the siphoning problem) or by pressure in a pipeline.

In the latter case, the metering unit must exert the necessary back pressure to overcome the pressure of the liquid in the circuit in which it is to be metered. In both cases, the pressure required to compensate for the pressure drop between the pump and the injection point must be added.

Accuracy required:

The degree of dosing accuracy and consistency required must be assessed, as well as the possibility to regulate and control the pump flow rate. Some applications require very high accuracy, while others may be less critical. It is important to select a metering pump that can provide the required accuracy.

Chemical compatibility:

It is essential that the chemical to be dosed is compatible with the pump materials that are in contact with it. For this purpose, the compatibility tables provided by the manufacturer can be consulted.

Operating conditions:

Operating conditions, such as ambient temperature and pressure, as well as power supply or (or pneumatics in the case of pneumatic motors) also need to be considered when selecting a metering pump. Some pumps may not be suitable for certain operating conditions.

There are different types of metering pumps, such as piston pumps, diaphragm pumps, diaphragm pumps, etc. (electromagnetic or electro-mechanical), pneumatic and peristaltic. Each has its advantages and disadvantages, so the most suitable one must be chosen according to the characteristics of the fluid and the process. See our article "Types of dosing pumps".

Some general recommendations for choosing a suitable metering pump are:

Opt for diaphragm or piston metering pumpsslow, i.e. with few pulses per minute, if the fluid is very dense. Piston and pneumatic pumps are also suitable for these applications, the latter if the chemical contains solid particles.

SEKO KOSMO dosing pump
864,80 € (VAT not included)
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SEKO SPRING MS1 12 V
798,70 € (VAT not included)
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SEKO SPRING PS1 three-phase
412,00 € (VAT not included)
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Opt for piston pumps if the fluid is viscous. (but not corrosive or abrasive) or requires high pressure. As the model Spring PS1

Opt for peristaltic pumps for low flow rates and low pressure. Also if the fluid is dense or corrosive. A suitable model is the pump Kronos

Opt for diaphragm pumps if high precision and low flow rate are required. (up to 20-30 l/h for electromagnetic pumps and 2300 l/h for electromechanical pumps). Link to Pumps

SEKO KOSMO dosing pump
864,80 € (VAT not included)
Rated 0 out of 5
Select options This product has multiple variants. The options may be chosen on the product page
SEKO SPRING MS1 three-phase
468,00 € (VAT not included)
Rated 0 out of 5
Select options This product has multiple variants. The options may be chosen on the product page

See more Electromagnetic Pumps that may be of interest to you.

Select the electronically controlled pumps if flow regulation and monitoring is required.

SEKO SPRING MS1 with Elektra
1.328,60 € (VAT not included)
Rated 0 out of 5
Select options This product has multiple variants. The options may be chosen on the product page
SEKO SPRING PS1 with Elektra
1.345,80 € (VAT not included)
Rated 0 out of 5
Select options This product has multiple variants. The options may be chosen on the product page

Visit our shop and you will find the pump that best suits your needs.

We hope you have found this article helpful in choosing the right metering pump for your application. If you have any questions or comments, please do not hesitate to contact us. For more information, please contact us by email info@prodos.es o in our contact form.