---
title: "Organomation - 12 Position N-EVAP Nitrogen Evaporator"
description: "The 12 position N-EVAP nitrogen evaporator is compact and allows for up 12 samples with varying evaporation end points to be evaporated simultaneously. "
type: article
version: 1
version_id: "babafb64-5e7a-4c04-9656-b11b1583d231"
generated_at: "2026-10-20T14:42:18.397Z"
author: "Organomation"
date_modified: "2026-08-28T14:20:29.933Z"
language: en
reading_time: "5 min"
word_count: 914
keywords: ["12 Position N", "EVAP Nitrogen Evaporator"]
url: "https://www.organomation.com/products/nitrogen-evaporators/n-evap/12-position"
---

# Organomation - 12 Position N-EVAP Nitrogen Evaporator

> The 12 position N-EVAP nitrogen evaporator is compact and allows for up 12 samples with varying evaporation end points to be evaporated simultaneously.

## Key Takeaways

- 12 Position N-EVAP Nitrogen Evaporator

#11155

## 12 Position N-EVAP
Nitrogen Evaporator

#### DESCRIPTION

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

**Flexible**

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

**Customizable**

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

#### STANDARD FEATURES

-   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

-   Reduced height (Option Code# -S), Cat# 11155-S *(not available for dry baths)*

#### SPECS

#### TESTIMONIALS

[](https://blog.organomation.com/blog/concentrating-pfas-samples-ahead-of-lcms?hsLang=en)

#### MODELS

*\* 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.*

#### RESOURCES

-   [What is Nitrogen Blowdown Evaporation](https://www.youtube.com/watch?v=e9dbWmoWwSw)

-   [N-EVAP Instruction Manual (Catalog #s 11106, 11155, 11250) for Water Bath Models - Version 22.5](https://www.organomation.com/hubfs/N-EVAP%20\(Water%20Bath\)%20~%2011106%20~%2011155%20~%2011250%20~.pdf?hsLang=en)

-   [N-EVAP Instruction Manual (Catalog #s 11155, 11250) for Dry Bath Models - Version 22.5](https://www.organomation.com/hubfs/N-EVAP%20\(Dry%20Bath\)%20~%2011106%20~%2011155%20~%2011250%20~-1.pdf?hsLang=en)

-   [N-EVAP Instruction Manual (Catalog #s 11106, 11155, 11250) for No Bath Models - Version 20.5](https://www.organomation.com/hubfs/Website%202021/Products/Nitrogen%20Evaporators/N-EVAP/45%20Position/%5BMANUAL%5D%20N-EVAP%20\(No%20Bath\)%20_%2011106%20_%2011155%20_%2011250%20_.pdf?hsLang=en)

-   [N-EVAP Parts and Accessories List](https://www.organomation.com/hubfs/N-EVAP%20Accessories%20Sheet.pdf?hsLang=en)

-   [12 Position N-EVAP Brochure and Specifications](https://www.organomation.com/hubfs/12%20Position%20N-EVAP%20Evaporator.pdf?hsLang=en)

#### ACCESSORIES

-   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

#### REPLACEMENT PARTS

-   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

#### GET A QUOTE

---

## About This Content

**Source:** [Organomation - 12 Position N-EVAP Nitrogen Evaporator](https://www.organomation.com/products/nitrogen-evaporators/n-evap/12-position)
**Author:** Organomation

*This content is provided for informational purposes. Please visit the original source for the most up-to-date information.*