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High-Quality, American-Made Lab Equipment


34 Position N-EVAP
Nitrogen Evaporator


Our 34-position nitrogen evaporator (cat# 11634) offers a large number of sample positions, without compromising any of the classic N-EVAP features. This time-tested, durable system provides one of the least expensive prices per position of all our N-EVAPs. The evaporative system, along with the standard flow control and pressure reducing regulator, enables the operator to achieve the desired level of concentration with efficient nitrogen usage. Our unique dual band spring hoist assembly ensures easy and effective operator use.

Additionally, the 34 position N-EVAP includes a side control box, which provides timed and digitally controlled water bath temperatures to produce even evaporation rates. The pressure regulator and timer combine to allow timed automatic gas flow cut off which slows evaporation to a minimum once the timed cycle has been completed. In order to prevent damage to delicate samples, the timer also provides the option for the heat to shut off once the cycle is complete.


N-EVAP nitrogen evaporators combine nitrogen blow down with a heated bath to gently concentrate delicate samples


An adjustable sample holder design fits a wide variety of sample tubes and vials at once


Digital controls allow exact temperature regulation

Individualized Control

Optimize evaporation of diverse samples with individual gas flow control at each vial


  • Nitrogen filter

  • Adjustable flow meter, 0-30 lpm

  • Built-in pressure reducing regulator

  • Side control box

  • Digital temperature controller

  • Electronic timer

  • Safety control cover plate

  • High pressure phthalate free tubing

  • High temperature limit switch for safety

  • Dual band spring hoist assembly

  • Precision needle valve tube assembly

  • Needles, 4-inch x 19 gauge with brass plated hub and stainless-steel shaft

OPTIONS (Add to main Cat# when purchasing)

  • 220v wiring harness (Option Code# -2), Cat# 111634-2

  • Z-Purge/positive pressure purge case (Option Code# -Z), Cat# 11634-Z

  • Acid resistant coating on instrument and needles (Option Code# -RT), Cat# 11634-RT





Instrumental Name 34 Position N-EVAP 34 Position N-EVAP
Bath Type Water None
Instrumental Catalog Number 11634 11634-O
Number of Sample Positions 34 34
Overall Dimension (w x d x h) 24 x 19 x 34 in
61 x 48 x 86 cm
19 x 17 x 32 in
48 x 43 x 81 cm
Sample Holder Layout Circular Circular
Gas Manifold Layout Single Ring Single Ring
Test Tube Range (Standard Sample Holder) 10-30 mm OD 10-30 mm OD
Gas Flow Meter 0-30 L/min 0-30 L/min
Stainless Steel Needles (Length x Gauge) 4.0 in x 19 ga
102 mm x 19 ga
4.0 in x 19 ga
102 mm x 19 ga
Built-in Nitrogen Gauge Input 30-110 psig 30-110 psig
Sample Tray Lift Mechanism Dual Band Spring Hoist Assembly Dual Band Spring Hoist Assembly
Rotating, Leak Tight Gas Fitting Standard Standard
Acid Resistant Coating Optional Optional
Heating Device Specs
Model Number
13165 n/a
Heating Medium Water None
Inside Dimensions (Diameter x Depth) 16.0 x 4.5in
40.6 x 11.4 cm
Outside Dimensions (w x d x h) 24 x 19 x 6 in
61 x 48 x 15 cm
Total Wattage 1300 W n/a
Bath Temperature Range 30-90 °C n/a
Temperature Controller Type
Digital Electronic with LED Display n/a
Controller Accuracy +/- 2 °C n/a
Side Mounted Control Box with Timer for Nitrogen & Heat Standard n/a


Amy & David CTA


Catalog Number Bath Type
11634 Water
11634-O No Bath*

*All “-O” models come with a base and stand assembly instead of a heated bath. These instruments are designed for evaporation procedures performed at ambient temperature.


  • Nitrogen generator (cat# NA1955)

  • Pasteur pipette adapters (cat# NA0636)

  • High temperature silicone fluid (cat# NA1240)

  • Various needle sizes and gauges


  • P0627: Valve Tube Assembly – Post 1997

  • P0607: Luer & washer for N-EVAP valve tube

  • P0634: Tube Fitting nylon 3 part for N-EVAP valve tube