Quick answer. Choose the condenser for your lowest-boiling solvent, then make sure the quotation covers the rest of the system. Diagonal condensers (RVE-0001, RVE-0004, RVE-0005) are compact and fit under a low shelf; vertical condensers (RVE-0002, RVE-0006, RVE-0007) offer more condensing surface; cold trap condensers (RVE-0003, RVE-0008) suit volatile solvents and protect the pump from carry-over. With diethyl ether or dichloromethane, a diagonal condenser of modest area struggles and solvent passes through to the pump. Ask for each condenser's surface area, and have the pump, vacuum control, chiller and glassware quoted with the evaporator.
Eight or more rotary evaporators are listed here, RVE-0001 upward, distinguished by condenser arrangement: diagonal, vertical and cold trap, each in more than one variant. A rotary evaporator removes solvent by heating a flask under vacuum while it rotates, and those three conditions together, hot glass, reduced pressure and a flammable solvent, define both what to specify and what can go wrong. The choice between condenser types and what the machine is not supplied with are the two things to settle.
| Arrangement | Codes | What it suits |
|---|---|---|
| Diagonal condenser | RVE-0001, RVE-0004, RVE-0005 | The common form: compact, lower overall height, easy to fit under a low shelf |
| Vertical condenser | RVE-0002, RVE-0006, RVE-0007 | Taller, with more condensing surface available; often preferred for low-boiling solvents and for reflux-type use |
| Cold trap condenser | RVE-0003, RVE-0008 | For low-boiling and volatile solvents, and where the vacuum pump must be protected from solvent carry-over |
Ask for the condenser surface area of each and the solvents the supplier recommends it for, because that is the specification behind the three names. If your work includes low-boiling solvents such as diethyl ether or dichloromethane, say so, since those are the cases where a diagonal condenser of modest area struggles and solvent passes through to the pump.
A rotary evaporator is three or four purchases presented as one, and quotations routinely cover only the first. Ask, explicitly:
Implosion. Glassware under vacuum fails suddenly and completely rather than cracking first, and a scratch or a star crack is enough to start it. So: inspect every flask against the light before it goes on, retire scratched glassware rather than using it for one more run, run the unit behind a shield or specify coated glassware, and never apply vacuum to a flask that is not designed for it. Ask the supplier what the glassware is rated for.
Bumping. A flask whose contents suddenly boil throws sample up into the condenser and loses the work. It is caused by applying vacuum too quickly or running the bath too hot for the pressure. The defences are a vacuum controller, raising the vacuum gradually, keeping the bath only moderately above the solvent's boiling point at the working pressure, and rotating fast enough to keep the film moving. Ask whether a splash guard or an anti-bumping adaptor is available.
Peroxides. This is the one that causes injuries. Solvents that form peroxides, notably diethyl ether, tetrahydrofuran and dioxane, must never be evaporated to dryness, because the peroxides are less volatile than the solvent and concentrate in the residue, where they can detonate. Leave a residue of solvent in the flask, test or date-control the solvent stock, and write the rule into the standard operating procedure. If your laboratory holds any of those three solvents, this belongs on the wall next to the machine.
Ask whether the heating bath takes water or oil and what the maximum temperature is. A water bath is simpler, cleaner and limited to about the boiling point of water; an oil bath reaches higher but is a burn and fire risk in its own right, needs the right oil, and makes a mess of everything it touches. Ask for an independent over-temperature cut-out either way, the bath volume, whether it lifts clear of the flask, and whether the lift is manual or motorised, which matters because the standard emergency action is to drop the vacuum and raise the flask out of the bath quickly.
Then ask the rotation speed range and whether it is displayed, the maximum flask size the drive will turn when full, the seal type and its expected life and price, since the rotary seal is the wearing part and a leaking seal means a vacuum that will not hold, and whether there is any overload protection on the drive. Ask what the unit weighs and whether it needs bolting or clamping to the bench.
Several codes in this listing share a condenser description and differ only in a suffix that the name does not explain, so ask for the specification sheets side by side and establish what each variant actually adds before choosing. Ask also for the installation requirements as a document, the supply voltage, frequency and plug type for your country, replacement glassware, seal and tubing prices, the service arrangement in your country, and the warranty, including whether it covers glassware. Any vacuum, temperature or speed figure quoted is confirmed in writing on the quotation; ask for the conditions behind it.
Solvent extraction, which is where most of the solvent handled on a rotary evaporator comes from, is under Mantles and Soxhlet Apparatus. Acid digestion and distillation are under Kjeldahl Digestion and Distillation Unit, water purification under Water Distillations and Stills, and separation by thin-layer chromatography and electrophoresis under TLC and Electrophoresis Apparatus. Weighing is under Lab Balances and Scales and sterilisation and shaking under Autoclaves, Sterilizers and Shakers.
Name the solvents you will evaporate and the flask sizes you work with, and ask for a quote covering the pump, the chiller and the glassware rather than the evaporator alone. For example a vertical-condenser unit (RVE-0002) with a diaphragm pump and vacuum controller, a recirculating chiller, coated evaporating and receiving flasks, and the ultimate vacuum and condenser area stated in writing. Contact Ray Export for specifications, prices and lead times.
Match it to your solvents. The diagonal condenser (RVE-0001, RVE-0004, RVE-0005) is the common form: compact, with lower overall height. The vertical condenser (RVE-0002, RVE-0006, RVE-0007) is taller with more condensing surface available, and is often preferred for low-boiling solvents and reflux-type use. The cold trap condenser (RVE-0003, RVE-0008) is for low-boiling and volatile solvents, and where the vacuum pump must be protected from solvent carry-over. Ask for the condenser surface area of each and the solvents the supplier recommends it for, because that is the specification behind the three names.
Ask explicitly, because a rotary evaporator is three or four purchases presented as one and quotations routinely cover only the first. A diaphragm pump is chemically resistant and the usual modern choice. A rotary vane oil pump pulls harder, but solvent condenses into its oil, ruining the oil and sending solvent out of the exhaust, so with one of those a cold trap is not optional. A water aspirator uses a great deal of water and gives a poor vacuum. Get the ultimate vacuum figure, ask whether there is a vacuum controller or only a bleed valve, and ask where the pump exhaust is assumed to go.
Ask the cooling water flow rate and temperature the condenser needs, and whether a recirculating chiller is available. A condenser fed from a building supply fails when the building supply fails, and the result is solvent vapour in the room. For glassware, ask which flask sizes are supplied, whether evaporating and receiving flasks are both included, and the joint sizes, and ask whether plastic-coated or shielded glassware is available, since that is what contains the fragments if a flask fails under vacuum. Ask too whether the warranty covers glassware.
Treat every flask as a possible failure. Glassware under vacuum fails suddenly and completely rather than cracking first, and a scratch or a star crack is enough to start it. Inspect every flask against the light before it goes on, retire scratched glassware rather than using it for one more run, run the unit behind a shield or specify coated glassware, and never apply vacuum to a flask that is not designed for it. Ask the supplier what the glassware is rated for, and keep replacement flasks in stock so that a damaged one is never used out of necessity.
Because of peroxides, the hazard that causes injuries. Solvents that form peroxides, notably diethyl ether, tetrahydrofuran and dioxane, must never be evaporated to dryness: the peroxides are less volatile than the solvent and concentrate in the residue, where they can detonate. Leave a residue of solvent in the flask, test or date-control the solvent stock, and write the rule into the standard operating procedure. If your laboratory holds any of those three solvents, the rule belongs on the wall next to the machine, whichever condenser and pump you choose.
Ask whether the bath takes water or oil and its maximum temperature. A water bath is simpler and cleaner but limited to about the boiling point of water; an oil bath reaches higher but is a burn and fire risk in its own right. Either way, ask for an independent over-temperature cut-out, the bath volume, and whether the lift that separates flask and bath is manual or motorised, since the emergency action is to drop the vacuum and raise the flask out quickly. Then ask the rotation speed range, the maximum full flask the drive will turn, and the rotary seal type and expected life.
Ray Export is a manufacturer and exporter of laboratory, scientific and educational equipment based at Plot No. 449, HSIIDC Industrial Area, Saha, Ambala, Haryana 133104, India. Enquiries: [email protected], +91-9817319615.
Written by Palak Mall, Senior Content Writer. Technically reviewed by Arvind Kumar, Lab Equipment Specialist, 12+ years in laboratory and testing instrumentation. Last updated: 18 October 2026.
Every specification, including condenser surface area, ultimate vacuum, bath temperature and rotation speed, is confirmed in writing on the quotation; ask for the conditions behind any figure. For certificates, contact us for the latest copies of the relevant certificates. No price is quoted here. Listing defects noticed: several codes share a condenser description and differ only by a suffix the name does not explain, so ask for the specification sheets side by side.
It has worked in coursing pump and water tank of rust evidence tempered steel. The implicit pump has a stream rate of 2.5 meters and inside tank capacityacity 10 liters. The temperature is controlled by a computerized temperature, pointer cum controller. Development: The body of the chiller is mounted on a solid edge outline with internal chamber comprising of thick cleaned hardened steel store with cooling curl appropriately fastened outwardly of the same to guarantee consummate cooling from +0 degree celsius to beneath encompassing. The empty space between the internal chamber and external divider is loaded with high review protection to counteract loss of temperature the refrigeration framework comprising of hermetically fixed blower for least commotion lever and smooth activity.
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