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Dosing pumps R05- Ex

The safe dosing of liquids and gases in potentially explosive atmospheres in Zones 1 and 2

Metering pumps R05 in explosion-proof design

Ex-proof metering pumps Ritmo®05 Ex have the same constructive characteristics and advantages of a metering pump Ritmo®05. They are equipped in full PTFE for all fluid-wetted components, have positively controlled valves and a pulsation-poor discharge process.


Ritmo®05 Ex dosing pumps are designed for use in Zone 1 and 2 hazardous areas. All liquid and gaseous media of gas class IIB may be used, with the exception of class IIC gases, e.g. Hydrogen, acetylene or carbon disulfide are metered.
The explosion protection design is based on the type of protection EEx p according to EC Directive 214/34 / EU.
The R05-Ex consists of a pump housing with independent Ex-e approval, an Ex p control unit with flushing and pressure control function, proportional valve technology with automatic leakage compensation.

The pump head, located outside of the Ex-housing, is decoupled from the Ex housing. Leakage of the membrane or rupture of the membrane does not cause dosing liquid or gas to penetrate into the explosion-proof housing.

Ex II 2G Ex eb mb pxb IIb T4

The explosion protection of the dosing pump Ritmo®05 Ex is ensured by overpressurization of the hermetically sealed pump housing.

The pump housing is designed in IP54 and has an Ex-e approval.

A flushing connection is used to pressurize the Ex housing with an overpressure of 12 mbar. For this purpose, air / compressed air or nitrogen is fed into the housing. The overpressure in the pump housing prevents penetration of explosive atmosphere into the pump housing.

An Ex-p control unit in the pump housing with flushing and pressure control function and proportional valve technology with automatic leakage compensation ensure that the housing overpressure is maintained

Automation capability

The Ritmo®05 Ex dosing pump can be connected to external control units in potentially explosive locations and has a high level of automation capability under explosion protection conditions.
Ex-designed interface relays in a Ex-designed terminal box disconnect the input signals from the pump. It can be operated via Start / Stop, via an analog interface 4-20 mA and via a digital RS232 interface. In addition to setting the dosing rate, the RS232 digital interface can also be used to control additional functions such as "return", "clean", "max" or "cal".

Material features:

All fluid contacting components, i.e. valves, diaphragm and dosing head are made of virgin ultrapure PTFE and with special PTFE modifications to ensure ultimate chemical resistance. Ritmo 05 Ex dosing pumps can therefore dose almost all aggressive fluids and gases, acids, alkalis, solvents.
The consistent PTFE equipment ensures the highest levels of purity, absolute metal freedom down to the ppb range and FDA conformity.


Ritmo®05-Ex dosing pumps differ considerably from diaphragm dosing pumps with commonly used ball valve technology. They work with small valve diaphragms, which are clocked by solenoids and ensure absolutely dense working conditions and high vacuum compatibility.
Positively controlled valves ensure insensitive dosing behavior against gas bubbles in the fluid, outgassing effects on liquids with high vapor pressure or gas leaks due to leaks or empty dosing lines.
Ritmo®05-Ex metering pumps are absolutely self-priming, absolutely leakproof between the suction and discharge side and do not need to be vented, filled or protected against dry running.

Fluid connections

Stainless steel fittings are provided for the fluid connections, taking into account the Ex protection conditions.
For this purpose, special cutting ring fittings with PTFE inserts or our so-called REA-Flex fittings are available.
The cylindrical flex-inlet of the REA-Flex fittings ensures high chemical resistance and the flexible silicone sheath ensures absolute tightness of the screw connection.

Software-options R05 Ex

Software options, which are available for the standard metering pump R05, can also be used for the R05-Ex metering pumps. It include upgrading and expanding the capabilities of a R05 Ex pump with adjustments to specific fluid properties, plant configurations, and control options.

Software equipment Ritmo®05-AK (AK = Antikavitation)
With this software, the user can vary the suction process in 0.5 seconds increased and adapted to its process. This offers itself et al during suction from the vacuum or when dosing viscous fluids or to reduce outgassing effects (fluids with high vapor pressure)

Software equipment Ritmo®05-VD (VD = vacuum on the pressure side)
Behind this software-side equipment is the ability to equqlize the discharge process into a vacuum process (e.g., in distillation columns or thin film evaporators) by the permanent clocking of the pressure-side valve of the metering pump. During the ejection process, the pressure-side valve is opened and closed at short intervals of approx. 250 msec.

Software features Ritmo®05-PA (PA = low-pulsation suction)
Behind this software-related equipment is the reversal of the dosing processes of an R05. Depending on the dosing rate entered, the dosing pump sucks the fluid slowly out of the process and pushes the aspirated dosing volume with max. short time via the pressure-side valve. With this software very even and product gentle suction can be realized.

Software Features Ritmo®05-TW (TW = Timer-Wait)
With the timer setting, the dosing pump is given the duration of the dosing process. With the wait setting, the dosing pump is given the time of starting a dosing. From this moment on, the dosing pump works at the set dosing rate until the preset time has elapsed.

Software features Ritmo®05-RD (RD = reversible dosing)
The dosing pump can work reversibly in its suction and discharge cycles. Especially with absolutely inert working conditions towards the environment or in certain dilution processes, this method of operation is appropriate. The metering pump may e.g. be filled with a suitable fluid, and in the further course of work, only a few suction and discharge strokes can be reversibly worked, without the inert fluid necessarily having to fill the pump chamber.

Software features Ritmo®05-VH (VH = variable stroke)
With this software the dosing pump works with variable stroke and always maximum discharge speed. The set dosing rate is ensured via the stroke length. This procedure is particularly advantageous in rapid dosing and control processes, typically the dosing control and readjustment of the dosing pump via a high-resolution balance.

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