Dosing Pumps, Dosing Systems, Fittings, Dosing Units, Diaphragm Compressors. Single diaphragm pumps. Double diaphragm pumps. Piston diaphragm pumps. Piston pumps. Plunger pumps. Solenoid diaphragm pumps. Automatic dosing units. Polyelectrolyte dissolving units. Dosing screws. Metal diaphragm compressors. Gas pumps. a.o. Applications for the following industries: Drainage water neutralisation, Laboratories, Agriculture, Swimming pool equipment, Environmental technology, Water treatment and other.

About Us


Competence in the dosing, feeding and compression of liquids and gases

Committed to tradition, the name Seybert & Rahier (sera) has been representing quality, innovation, competence and flexibility since the company founding more than 60 years ago in Immenhausen. As an independent family business and one of the worldwide leading German companies in the field of dosing and compressor technology, sera operates as a flexible and reliable manufacturer and system and full range provider.

Whether for waste and drinking water treatment, the food and drinks industry, the paper and textile industry or energy and environmental technology. sera provides efficient, complete solutions optimally customised for the customer for all application cases involving the precise dosing and conveying of liquids and gases.


Suction Lance

sera Suction lance are used for tapping the chemicals out of the drum. The integrated foot valve prevents the back flow of the inducted medium The types SL-02, S-03 and S-04 have an additional level switch (for signal 'empty').


It contains various valves like dosing valve, diaphragm pressure keeping valve, manual ventilation valve, multi-functional valve, check valve, float valve, diaphragm relief valve, foot valve.


Maintenance- and Repair Service

Your installed sera systems are serviced and maintained by our experienced service technicians on request. Cost-effective concepts for modernisation of your systems and pumps can also be developed. sera provides you with maintenance contracts on request as regular maintenance by the specialists increases the operational reliability.

Installation and Commissioning

Experienced sera service technicians are available for the commissioning and installation of your purchased system. On request, the installation can also be carried out  by your skilled personnel under the instruction of the sera service technician. Thus, early start-ups are possible and your personnel are best familiarised with the new system in the course of the installation. Cost-effective concepts for the optimisation or modernisation of the ...


Customer Training

Training courses by sera are held by us at our premises and also at your site on request. Our training courses are both customer as well as application oriented. Thus you always receive the best training matched to your individual requirements so that you have the optimum basis for handling our products.


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ACHEMA 2015, WWETT - Water & Wastewater Equipment, Treatment & Transport Show


Company details

Business Type:

Industry Type:
Water and Wastewater - Chemical Water Treatment

Market Focus:
Globally (various continents)

Year Founded:


Office & Distributor locations:


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