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High-Quality, American-Made Lab Equipment


24 Position N-EVAP
Nitrogen Evaporator


The 24 position N-EVAP is our most adaptable benchtop evaporator. The basic model offers all of the standard features from our N-EVAP line. Additionally, the 24 position N-EVAP offers the most customizable options for your sample preparation needs. The standard sample holder can accommodate samples with an outside diameter of 10-30 mm. However, with the optional 8 position large sample holder, vials with an outside diameter of 30-70 mm can be processed. The 24 position N-EVAP test tube evaporator can also be upgraded to include digital controls for heat and time with the addition of the side control box (Option code -CB).

These economical units provide controlled concentration of sample vials through the application of nitrogen gas within a heated water bath. The dual band spring hoist assembly provides a simple and effective means of removing samples from the 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. Time tested technology and proven construction ensure a long lasting, user-friendly experience.


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


A large sample holder option can be added to accommodate vials with a larger outside diameter up to 70 mm

Individualized Control

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



  • Nitrogen filter

  • Adjustable flow meter, 0-20 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# 11250-2

  • Z-Purge/positive pressure purge case (Option Code# -Z), Cat# 11250-Z

  • Acid resistant coating on instrument and needles (Option Code# -RT), Cat# 11250-RT

  • Side control box with built-in digital controller, timer, and pressure regulator (Option Code -CB), Cat# 11250-CB





Instrumental Name 24 Position N-EVAP 24 Position N-EVAP 24 Position N-EVAP
Bath Type Water Dry None
Instrumental Catalog Number 11250 11250-DA 11250-O
Number of Sample Positions 24 24 1224
Overall Dimension (w x d x h) 16 x 15 x 33 in
41 x 38 x 84 cm
16 x 15 x 27.5 in
41 x 38 x 70 cm
16 x 15 x 31.75 in
41 x 38 x 81 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) 30-70 mm OD 30-70 mm OD 30-70 mm OD
Gas Flow Meter 0-20 L/min 0-20 L/min 0-20 L/min
Stainless Steel Needles (Length & 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
Gas Input Range with Optional Pressure Reducing Regulator 30-160 psig 30-160 psig 30-160 psig
Acid Resistant Coating Optional Optional Optional
Heating Device Specs
Model Number
9125 5125
Heating Medium Water Aluminum Beads (Glass Beads in -RT Models) None
Inside Dimensions (Diameter x Depth) 12.0 x 4.5 in
30.5 x 11.4 cm
12.0 x 4.5 in
30.5 x 11.4 cm
Outside Dimensions (w x d x h) 16 x 15 x 7 in
41 x 38 x18 cm
16 x 15 x 7 in
41 x 38 x18 cm
Total Wattage 900 W 540 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 24 Position N-EVAP
11250 Water
11250-NT No Teflon, Water Bath*
11250-DA Dry Bath
11250-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.


  • Large vessel sample holder, 8 positions, for vial outside diameters of 30-70 mm (cat# NA1228)

  • 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