Teflon-Free N-EVAP nitrogen evaporators are specifically designed for PFAS sample preparation and concentration workflows in analytical and environmental laboratories. Built entirely without PTFE or other fluoropolymers, these systems help minimize the risk of contamination during nitrogen blowdown evaporation while enabling simultaneous processing of multiple samples.
Referenced in EPA PFAS methods 533, 537.1, and 1633, the Teflon-Free N-EVAP models are widely used in environmental and research laboratories requiring reliable PFAS sample preparation. The systems support both 15 mL and 50 mL centrifuge tubes and feature individual needle valves for each sample position, allowing independent nitrogen flow control and flexible processing of samples with different evaporation endpoints.
Designed for laboratories requiring both contamination control and workflow flexibility, the Teflon-Free N-EVAP provides an efficient solution for PFAS research and analytical applications.
- Small Footprint: N-EVAP Models 111 and 112 require about one square foot of bench space
- Flexible: An adjustable sample holder design fits a wide variety of sample tubes and vials at once
- Teflon-Free Guarantee: Made with 100% PTFE-free materials to avoid contamination of PFAS samples
- Individualized Control: Optimize evaporation of diverse samples with individual gas flow control at each vial
Standard features
- Nitrogen filter
- Adjustable flow meter
- Phthalate free silicon tubing eliminates contamination concerns
- High temperature limit switch for safety
- Dual band spring hoist assembly
- 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)
- 12 position model: Cat# 11155-NT-2
- 24 position model: Cat# 11250-NT-2
- Reduced height (Option Code# -S)
- 12 position model: Cat# 11155-NT-S
- 24 position model: Cat# 11250-NT-S
Specifications
- Bath Type: Water
- Instrumental Catalog Number:
- Teflon-Free 12p N-EVAP: 11155-NT
- Teflon-Free 24p N-EVAP: 11250-NT
- Number of Sample Positions:
- Teflon-Free 12p N-EVAP: 12
- Teflon-Free 24p N-EVAP: 24
- Standard Dimensions (w x d x h):
- Teflon-Free 12p N-EVAP: 13 x 11 x 31 in / 33 x 28 x 79 cm
- Teflon-Free 24p N-EVAP: 16 x 15 x 33 in / 41 x 38 x 61 cm
- Reduced Height Dimensions (w x d x h):
- Teflon-Free 12p N-EVAP: 13 x 11 x 24 in / 33 x 28 x 61 cm
- Teflon-Free 24p N-EVAP: 16 x 15 x 24 in / 41 x 38 x 61 cm
- Sample Holder Layout: Circular
- Gas Manifold Layout: Single Ring
- Test Tube Range (Standard): 10-30 mm OD
- Test Tube Range (Optional):
- Teflon-Free 12p N-EVAP: 5-16 mm OD
- Teflon-Free 24p N-EVAP: 30-70 mm OD
- Gas Flow Meter:
- Teflon-Free 12p N-EVAP: 0-10 L/min
- Teflon-Free 24p N-EVAP: 0-20 L/min
- Stainless Steel Needles (Length x Gauge):
- Teflon-Free 12p N-EVAP: 4.0 in x 19 ga
- Teflon-Free 24p N-EVAP: 102 mm x 19 ga
- Sample Tray Lift Mechanism: Dual Band Spring Hoist Assembly
- Standard Gas Input Range: 20-30 psig
- Gas Input Range w/Optional Pressure Reducing Regulator: 30-160 psig
Heating Device Specs
- Model Number:
- Teflon-Free 12p N-EVAP: 5585
- Teflon-Free 24p N-EVAP: 9125
- Heating Medium: Water
- Inside Dimensions (Diameter x Depth):
- Teflon-Free 12p N-EVAP: 8.5 x 4.5 in / 21.6 x 11.4 cm
- Teflon-Free 24p N-EVAP: 12.0 x 4.5 in / 30.5 x 11.4 cm
- Outside Dimensions (w x d x h):
- Teflon-Free 12p N-EVAP: 13 x 11 x 7 in / 33 x 28 x 18 cm
- Teflon-Free 24p N-EVAP: 16 x 15 x 7 in / 41 x 38 x 18 cm
- Total Wattage:
- Teflon-Free 12p N-EVAP: 550 W
- Teflon-Free 24p N-EVAP: 900 W
- Bath Temperature Range: 30-90 °C
- Temperature Controller Type: Mechanical Thermostat
- Controller Accuracy: +/- 2 °C
Accessories
- Small vessel sample holder for 12 position N-EVAP model only, for vial outside diameters of 5-16 mm (cat# NA1132)
- Large vessel sample holder for 24 position N-EVAP model only, for vial outside diameters of 30-56 mm (cat# NA1113)
- Teflon-free nitrogen generator (cat# NA1955-NT)
- Pasteur pipette adapters (cat# NA0636)
- Teflon-free pressure reducing regulator 0-160 psi (cat# NA0630-NT)
- 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
