Typical applications for chemistry diaphragm pumps include evacuating chemically aggressive gases and vapors from such equipment as rotary evaporators, vacuum drying cabinets and centrifugal concentrators. Chemistry diaphragm pumps from VACUUBRAND feature uncompromising chemistry designs. Their construction with fluoropolymers makes them very resistant to chemical vapors from inlet to exhaust and very tolerant to condensates. Our two-, three- and four-stage pumps also have a gas ballast valve that provides continuous purge with minimal impact on ultimate vacuum when working with condensable vapors. Pumping chambers are hermetically separated from the drive system ensuring long lifetimes of mechanical parts. Most importantly, diaphragm pumps are oil-free, for vastly reduced service demands compared with oil-sealed pumps. They eliminate the cost of water and its contamination well-known from water-jet aspirators, and the waste-oil disposal of rotary vane pumps.
Technical / Order Data & Product Comparison
- technical data
Chemistry diaphragm pumps, chemistry vacuum systems and chemistry pumping units
Our chemistry diaphragm pumps are available in a full range of volume flow rates and ultimate vacuum options. Single-stage models reach as much as 70 mbar (absolute) vacuum. Connecting pump heads in series as two-, three- or four-stage pumps improves an ultimate vacuum to as much as 0.6 mbar. Connecting heads in parallel provides higher flow rates. Our line offers combinations that satisfy virtually any laboratory need.
Nomenclature for VACUUBRAND pumps is built from the following codes designating specific features or components:
M = diaphragm (membrane) pump
E, Z, D, V = number of pump stages
E = single stage, up to 70 mbar
Z = two stages, up to 7 mbar
D = three stages, up to 1.5 mbar
V = four stage, up to 0.6 mbar
C = chemistry design, with fluoropolymer flowpath
NT = labels the series of pumps comprising the New Technology
AK = separator catchpot for inlet or outlet condensates, collects particles and droplets, keeps condensate in vacuum line from flowing into the pump, protecting pump performance and providing additional noise reduction on the pressure side
EK = exhaust vapor (emission) condenser for nearly 100 % solvent recovery in compact design, protecting environment and lab air
TE = dry ice or water ice cooled emission condenser for solvent recovery
PC = "Pumping Unit, Chemistry" - a chemistry pump with vacuum control and solvent recovery
Chemistry vacuum system = a chemistry pump with accessories like inlet catchpot and/or solvent recovery
Chemistry pumping unit = a chemistry vacuum system with vacuum control and solvent recovery
SYNCHRO = pumping unit for simultaneous operation of two independent vacuum applications by a single pump
VACUUBRAND offers chemistry vacuum systems and chemistry pumping units as complete ready-to-connect systems with the best chemistry diaphragm pumps for the desired vacuum range and volume flow rate. You can maximize the vacuum application's efficiency, functioning and environmental protection with the right combination of coordinated accessories. The basic pumps of the different system families are mounted in a space-saving portable system and equipped with the accessories appropriate for particular applications.
AK - (as shown) the separator catchpot for inlet or outlet-side condensates. The inlet (suction-side) separator catchpot collects particles and droplets of liquid. An exhaust (pressure-side) separator collects outlet condensate, keeps condensate from returning to the pump and helps keep the pump whisper quiet.
EK - (as shown) the emission condenser for capturing vapors from the exhaust side of the pump. Made of shielded glass, it is compact, but still highly efficient. It allows for virtually 100% recovery of solvents and protection of the atmosphere.
EK Peltronic® - an electronic emission condenser that operates without cooling water or dry ice. Peltier elements and air cooling afford clean, convenient refrigeration.
TE - a condenser for dry ice or water ice for emissions control and solvent recovery without cooling water supply.
Liquid level sensor: Keeps the collecting catchpots (at AK or EK) from overflowing; supplies warning signals via the electronic vacuum controller with VACUU·BUS® connections, and stops the pumping process if needed.
Manometer: A mechanical vacuum manometer provides trend indication, and approximate vacuum levels on some of our more basic models.
- MZ 2C NT +AK+M+D
- PC 101 NT
- PC 201 NT
Two vacuum connections on one pumping unit: We have systems and pumping units with a second vacuum connection available for independently operating two processes in parallel with just one pump. Check valves reliably isolate the two different applications from one another.
Manual flow-control regulation: The flow-control valve is designed for easy adjustment of the effective volume flow rate, and mounted on the inlet separator on some pumping units
Please find Vacuubrands Chemistry diaphragm pumps and -pumping system product comparison in the link below.
- PTFE sandwich diaphragm and valves made of perfluro elastomer or PTFE
- Internal tubing and fittings made of PTFE / ETFE / ECTFE compounds
- Exceptional diaphgram lifetimes with ultra-durable PFTE sandwich design
- Headcover and clamping disc made of fluoro compounds with stability core for unsurpassed long-term performance
- Very long service internals for low lifetime cost-of-ownership
- Patent new drive system for extra quiet, ultra-low-vibration operation (NT)
- Patented new valve mounting system to simplify service access (NT)
- Smooth surfaces for easy cleaning (NT)
- New sealing system provides reduced leakage rates for improved ultimate vacuum (VT)
Down to 1.5 mbar
ATEX - Pumps
When intended for use in areas with potentially explosive atmospheres, European Community Directive 2014/34/EC (ATEX) requires equipment in conformity with ATEX standards. VACUUBRAND offers Category 2 chemistry diaphragm pumps and vacuum systems in conformity with ATEX (for use in zones where an explosive atmosphere is likely to occur). These chemistry diaphragm pumps are appropriate for such locations because they are highly resistant to chemicals, oil-free, have no sliding surfaces, and the expansion chamber is hermetically sealed against the drive zone. ATEX chemistry vacuum systems with solvent recovery provide safe, convenient vacuum while protecting the environment.
ATEX chemistry diaphragm pumps and vacuum systems are now available with variable speed motor for vacuum control as VARIO®-version.
The VACUUBRAND range of ATEX chemistry diaphragm pumps is supplemented by an ATEX vacuum gauge with excellent corrosion resistance and long-term stability. (Note: Compliance with EC Directive 2014/34/EC does not ensure compliance with similar codes in countries outside of the EC. These pumps are not available in every location. Contact your local VACUUBRAND representative for availability.)
The RC 6 chemistry-HYBRID pump is a combination of a two-stage rotary vane pump and a two-stage chemistry diaphragm pump for optimized corrosion resistance. The diaphragm pump maintains the oil reservoir under vacuum in order to keep the partial pressures of solvent vapors at levels below their condensation points and to reduce largely the concentration of oxygen and corrosive gases. Therefore the RC 6 chemistry-HYBRID pump has a much higher solvent vapor pumping capability and resistance to aggressive gases than conventional rotary vane pumps.
- reduced internal corrosion, even when working with corrosive vapors
- oil changes typically reduced 90% or more compared with rotary vane pumps alone
- excellent environmental friendliness due to efficient solvent recovery (accessory kit PC 8 with emission condenser; or as pumping unit PC 8)
- most economical solution: In practical operation a cold trap is often no longer necessary. For large amounts of vapors a pumping unit PC 3 / RC 6 with cold trap at the inlet is available
- ease of maintenance due to telescopic design
Thermodynamic functional principle of the chemistry hybrid pump
1 - Vapor is aspirated at low pressure and ambient temperature.
2 - Vapor is heated to approx. 60°C by heat exchange and compression within pump.
C - Condensation problem with "normal" rotary-vane pumps: On the way to atmospheric pressure, the saturation vapor pressure (transition to liquid state) is reached inside the oil-filled section. Result: Condensation and corrosion inside the pump; contamination of the oil.
3 - Chemistry-HYBRID Pump: The chemistry diaphragm pump evacuates the vapors from the oil reservoir of the rotary-vane pump. Under intended operating conditions, no condensation takes place inside the oil-filled part and, in particular, within the oil reservoir. (Any condensation taking place inside the oil-free diaphragm pump is much less problematic.) Less condensation means less corrosion and cleaner oil for longer life. For example, in the case of acid vapors, the evacuation of the oil reservoir to 20 mbar reduces corrosion by a factor of about 50!