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Dosaggio a tempo-pressione

How can you increase your sample throughput in the laboratory while also ensuring reliable processes? Pressure/time dosing allows you to dose your samples and reagents precisely while protecting them against the introduction of heat.

In-vitro diagnostics need reliable and cost-effective measurements

Measurement equipment is subject to strict requirements in the analysis of blood and urine samples in in-vitro diagnostics. Be it in the field of haematology, clinical chemistry or immunology, precise and error-free test results are needed, as human lives are often dependent on them. On the other hand, laboratories also face economic challenges, requiring high sample throughputs to be able to operate cost-effectively.

How do you dose very small amounts of fluid quickly and precisely without (cross-)contamination? With its pressure/time dosing solution, Bürkert has addressed your fluidic challenge. 

Your solution: Pressure/time dosing system from Bürkert

Bürkert’s pressure/time dosing system meets your need efficiently: 

  • Precisely reproducible dosing of samples, reagents and cleaning agents
  • Precise results 
  • High sample throughput

The pressure/time dosing system is ideal for in-vitro diagnostics. Precise, error-free dosing is an essential factor in identifying diseases by means of urine analysis or bloodwork, allowing diseases such as leukaemia, cancer of the lymph nodes, anaemia, AIDS or cardiovascular diseases to be reliably diagnosed. Precise pressure/time dosing provides optimum assistance in sample preparation and analysis. 

How pressure/time dosing works

Pressure/time dosing involves the medium being transported from the pressurised container through a valve to the dosing needle. Tank pressure, flow resistance, medium viscosity and medium temperature are precisely controlled. The medium is controlled by opening or closing the valve for a defined length of time in each switching cycle. Transporting the medium using pressure instead of a mechanical pump means that no moving parts can interfere with the medium flow.

Diagramm der Druck-Zeit-Dosierung mit Ventil

Bürkert’s solution satisfies the strictest requirements:

✓ Measures miniscule quantities down to the last μl 
✓ Meets hygiene requirements 
✓ Measures reproducibly by the second 
✓ Media can be changed quickly
✓ Flexibly adjustable dosing volume
✓ High sample throughput for cost-effective work
✓ Preventing uncontrolled heat input to ensure medium remains undamaged


Your benefits: Use pressure to measure more cost-effectively

Two factors in particular contribute to your laboratory’s success: A high sample throughput rate and reliable dosing processes. 

✓ Pressure/time dosing has a speed advantage
The tank is pressurised, making the reagent available at all times. When the valve opens, the device commences dosing without a time delay.

✓ Pressure/time dosing has a reliability advantage:
In a system solution all key components fit together like parts of a puzzle. Low production tolerances ensure that all valves switch consistently – even after replacement.

Two more reasons why Bürkert’s system solution is ideal for you: 

1. Bürkert’s valve technology makes the difference

Diagramm zeigt Schaltgeschwindigkeit des Ventils bei verschiedenen Drücken.

Regardless of the pressure used to dose a liquid, the valve opens and closes almost always at the same speed. This allows pressures to be increased or decreased arbitrarily – your valve will continue to work consistently fast and precisely. As the test of the Type 6650 shows, valve always switches after 5ms at each pressure.

2. Preventing heat input, protecting media

In addition, the design of the valve prevents uncontrolled heat input into the medium and helps to achieve accurate test results. 

Blood and urine samples contain proteins that are destroyed at temperatures of 41°C or above. For your dosing process, this makes it necessary to minimise heat input.

Bürkert valves keep heat out reliably:
✓ With low heat absorption
✓ With optimum thermal management

The Whisper Valve Type 6724 is an example of how uncontrolled heat input in the medium can be avoided.

Under the following conditions, we have measured the following in the fluid chamber: Standalone device, coil up, ambient temperature of 21°C, 100 % duty cycle, 26.4 V (10 % overvoltage).

The result of the test: When the medium is stationary the heat input into the medium is 9°C at maximum. The temperature in the fluid chamber is therefore no more than 30°C. This successfully prevents the proteins from being destroyed by temperatures of 41°C or more.

Normally there is a certain amount of flow when the device is switched on, which causes the temperature to drop substantially – this results in virtually no heating during normal operation.

During fluid flows the heat input into the medium caused by the valve is barely measurable:

Graph zeigt die Temperatur, die durch das Ventil Typ 6724 in das Medium abgegeben wird, in Relation zu verschiedenen Durchflusswerten. Bei steigendem Durchfluss ist der Wärmeeintrag in das Medium fast nicht messbar.

Our expertise: Fast, precise and systematic dosing

You want to speed up the dosing process? You want your analysis device to work more cost-effectively? In both cases, our components and system solutions provide you with support for pressure/time dosing:

Tailored solutions for your fluidic challenges

Bürkert is ready to assist you, and not just with well-conceived components. We also develop tailored system solutions for your equipment – with highly qualified engineers and the best production facilities in our Systemhäuser. There, we combine ideas, development, serial concepts, test laboratories and production under one roof. Speak to us about your specific solution needs.


Our products for your pressure/time dosing

Tipo 6650

Elettrovalvola flipper a 2/2 e 3/2 vie con membrana di separazione

Tipo 6650
  • Distanza di soli 4,5 mm per l'allineamento
  • A separazione del fluido, per mezzi aggressivi
  • Ad azione diretta
  • Vuoto fino a 7 bar
  • Commutazione rapida

Tipo 6712

2/2-way Whisper Valve with media separation

Tipo 6712
  • Highest chemical resistance combined with minimum internal volume
  • Compact design with 7 mm installation width
  • DN 0.8 mm (3 bar) and 0.4 mm (5 bar)
  • Switching noise < 36 dB
  • For dosing applications with excellent cleanability

Tipo 6724

Valvola Whisper a 2/2 o 3/2 vie con separazione dei fluidi

Tipo 6724
  • Elevata resistenza chimica
  • Design compatto con una larghezza di 8,9 mm
  • Ampiezza nominale 0,8 mm (vuoto fino a 5 bar) e 1,2 mm (vuoto fino a 3 bar)
  • Commutazione ultraveloce, silenziosa da < 20 dB (A) e consumo energetico molto basso
  • Resistenza elevata alla pressione di ritorno, eccellenti proprietà di lavaggio e durata di inserimento del 100%.

Tipo 6144

Elettrovalvola flipper a 3/2 vie, ad azione diretta

Tipo 6144
  • Ad azione diretta
  • 0 ÷ 10 bar
  • Basso consumo di energia elettrica
  • Standard, versione Ex ia
  • Larghezza di montaggio 10 mm / distanza di 11 mm per l'allineamento

Tipo 7615

Unità di microdosaggio, dosaggio preciso nel range dei microlitri

Tipo 7615
  • Pompa a membrana idonea ai più severi requisiti di resistenza chimica
  • Volume di dosaggio da 5 µl/corsa fino a 8 ml/min in entrambe le direzioni
  • Precisione del dosaggio +/-3,5 %
  • Autoaspirante
  • Elettronica integrata, facile utilizzo

Tipo 8763

Regolatore di pressione per un dosaggio preciso pressione/tempo

Tipo 8763
  • Dosaggio ripetibile e preciso di liquidi all’interno dell’intervallo µl
  • Tempo di risposta in millisecondi e scarico attivo della pressione per le migliori prestazioni di controllo
  • Comunicazione digitale per una facile integrazione nella rete dei bus di campo
  • Funzionalità estese grazie a un ingresso sensore aggiuntivo + uscita attuatore, ad es. per pompa o sensore di pressione aggiuntivo
  • Valvola di sfiato attiva per ridurre al minimo il consumo di costoso gas di trasporto

You want to precisely measure reagents and samples and receive perfect measurement results quickly? If so, get in touch with us.


Our solutions for other dosing principles: