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High-Quality, American-Made Lab Equipment


12 Position N-EVAP
Nitrogen Evaporator


The 12 position N-EVAP nitrogen evaporator (cat# 11155) is a compact unit that allows for up to 12 samples to be evaporated simultaneously. At each individual sample position, the gas flow can be controlled via a precision needle valve. This is ideal for the simultaneous evaporation of samples with varying evaporation end points. The sample tray has a spring tensioner which allows any test tube between 10-30 mm to be processed without any modifications to the instrument. An optional small sample holder allows samples with an outside diameter of 5-16 mm to be processed.

First introduced in 1959 as The Meyer N-EVAP, the 12 position N-EVAP (cat# 11155) was the first nitrogen dryer created by Organomation. It has proven to be an extremely durable, time tested and highly affordable member of Organomation’s N-EVAP line. These economical units provide controlled concentration of sample vials through the application of nitrogen gas within a heated water bath. The N-EVAP’s circular rotating design permits each sample to be accessible from the front of the instrument for easy insertion and retrieval. The chrome plated needle valves are individually milled from solid brass, enabling precise, uniform adjustments for your nitrogen blow down. This promotes efficient and safe sample reduction with minimal nitrogen waste.

Small Footprint

N-EVAP Model 111 requires under one square foot of bench space


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


Options are available for use with acidic or flammable solvents, heat- or water-sensitive samples, and more

Individualized Control

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


  • Nitrogen filter

  • Adjustable flow meter, 0-10 LPM

  • High pressure phthalate free tubing for safety

  • High temperature limit switch for safety

  • Dual band spring hoist assembly (except in dry bath model)

  • Precision needle valve tube assembly 

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

OPTIONS (Add to main Cat# when purchasing)

  • 220v wiring harness (Option Code# -2), Cat# 11155-2

  • Z-Purge/positive pressure purge case (Option Code# -Z), Cat# 11155-Z

  • Acid resistant coating on instrument and needles (Option Code# -RT), Cat# 11155-RT





Instrumental Name 12p N-EVAP 12p N-EVAP 12p N-EVAP
Bath Type Water Dry None
Instrumental Catalog Number 11155 11155-DA 11155-O
Number of Sample Positions 12 12 12
Overall Dimension (w x d x h) 13 x 11 x 31 in
33 x 28 x 79 cm
13 x 11 x 27.5 in
33 x 28 x 70 cm
12 x 8 x 31 in
33 x 28 x 79 cm
Sample Holder Layout Circular Circular Circular
Gas Manifold Layout Single Ring Single Ring Single Ring
Test Tube Range (Standard Sample Holder) 10-30mm OD 10-30mm OD 10-30mm OD
Test Tube Range (Optional Sample Holder) 5-16mm OD 5-16mm OD 5-16mm OD
Gas Flow Meter 0-10 L/min 0-10 L/min 0-10 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
4.0 in x 19 ga
102 mm x 19 ga
Sample Tray Lift Mechanism Dual Band Spring Hoist Assembly None/Fixed Dual Band Spring Hoist Assembly
Rotating, Leak Tight Gas Fitting Standard N/A Standard
Standard Gas Input Range 20-30 psig 20-30 psig 20-30 psig
Optional Gas Input Range with Optional Pressure Reducing Regulator 30-160 psig 30-160 psig 30-160 psig
Acid Resistant Coating (Option Code -RT) Optional Optional Optional
Heating Device Specs
Model Number
5585 5085
Heating Medium Water Aluminum Beads (Glass Beads in RT Models) None
Inside Dimensions (Diameter x Depth) 8.5 x 4.5 in
21.6 x 11.4 cm
8.5 x 4.5 in
21.6 x 11.4 cm
Outside Dimensions (w x d x h) 13 x 11 x 7 in
33 x 28 x 18 cm
13 x 11 x 7 in
33 x 28 x 18 cm
Total Wattage 550 W 500 W N/A
Bath Temperature Range 30-90 °C 40-130 °C N/A
Temperature Controller Type
Mechanical Thermostat Mechanical Thermostat N/A
Controller Accuracy +/- 2 °C +/- 2 °C N/A


Sarah & Connor CTA


Catalog Number Bath Type
11155 Water Bath
11155-NT No Teflon, Water Bath*
11155-DA Dry Bath
11155-O No Bath

* No Teflon (-NT) units designed for PFAS analysis using EPA methods 533, 537 and 537.1.

**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.


  • Small vessel sample holder, for vial outside diameters of 5-16 mm (cat# NA1132)

  • Nitrogen generator (cat# NA1955)

  • Pasteur pipette adapters (cat# NA0636)

  • Pressure reducing regulator 0-160 psi (cat# NA0630)

  • 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