Model 2120XL​​​

Trace Nitrogen Analyzer​



​In many argon or helium gas supply systems, the detection of trace nitrogen (N2) is essential in determining system integrity. The Model 2120XL is the new standard in this critical measurement. It provides continuous and accurate nitrogen analysis using field-proven emission spectroscopic technology in a space-saving 19” rack-mount 3U package.

Unique Design

The 2120XL’s unique design raises the bar for reliability available on the market. It uses a menu-adjustable, digitally controlled sample flow for all applications. During operations, the 2120XL allows for a wide range of pressures without affecting readings with a low overall sample flow requirement. Its plasma emission detector design is based on a unique Duty Cycle Controlled System which dramatically reduces contamination and coating inside the plasma cell, offering a more efficient, reliable and accurate analyzer than any other system available.

Non-Consuming Sensing Technology

The 2120’s non-consuming sensing technology requires no regular maintenance or replacement intervals, providing ultra-low detectability without the maintenance overhead of similar high-performance systems. Even when maintenance is required, the 2120XL offers ease of access to all internal  components which minimizes down time. A new design and specialized components also minimizes necessary volume for purge-down time.

Microprocessor-Based Electronics

The 2120XL operates with microprocessor-based electronics utilizing menu-driven functionality. Users are provided a large, luminescent LCD display and 2 x 20 vacuum fluorescent displays to show all menu functions and parameters. A preamplifier with multiple stage gains support a wide dynamic operating range. The 2120XL also offers a full diagnostics suite including a display of raw millivolt signal for troubleshooting.


  • Microprocessor-based electronics

  • User-settable ranges

  • 4-20 mA isolated analog output

  • Self-diagnostics with Form-C system alarm contact

  • Two (2) fully programmable concentration alarms with Form-C contact

  • Range Identification: Form-A contacts and 0-1 VDC

  • RS-232 bi-directional serial output

  • Digitally-settable flow rate

  • Optional integral auto-calibration valve manifold

  • Profibus DP communications option when used in conjunction with TAI Valve Box

Optional Equipment

  • Moisture trap (TAI P/N S1766)

  • Scrubber for purification of zero gas (TAI P/N S1748)​


  • Three user-settable ranges, default 0-1, 0-10, 0- 100 ppm

  • Modular design with removable top for easy access to all components

  • Proven plasma emission detector with Duty Cycle

  • Controlled system minimizes maintenance and offers continuous detection with 5 ppb lower-detectable limit

  • No switching valves, column or carrier gas required

  • Integral digital sample flow control

  • 19” rack mount with 3U form factor

  • Microprocessor-based electronics with menu-driven functionality and diagnostics

  • 5-digit LCD display for easy-to-view concentration and 2x20 vacuum fluorescent display for menu functions

  • 0-1 VDC and 4-20mA (isolated) analog outputs

  • 0-1 VDC and Form-A contacts for Range Identification

  • RS-232 bi-directional serial output

  • Form-C contacts for system alarm and two user-configurable concentration alarms

  • Power: 100-240 VAC, 50/60 Hz​



​0-1, 0-10, 0-100 ppm, user-settable, fixed or auto-ranging
Higher ranges optional


​PPM Readout:      0.01 ppm below 10 ppm
                               0.1 ppm at or above 10 ppm
PPB Readout:       0.1 ppb


​1% of full scale


​1% of full scale

​Gas Connections

​1/8 inch tube fitting

​Calibration Gas

​Zero:      Purified argon/helium
Span:     PPM nitrogen in argon/helium

​Sample Flow

​20-200 sccm, programmable


​4-30 PSIG


50° to 95°F (10° to 35°C)


​110-240 VAC 50/60 Hz, 60 watts max


​5.22"H x 19"W x 18.40"D (13.26 x 48.26 x 46.74 cm) (3U form factor)
Approximately 35 lbs (15.88 kg)


  • Air separation unit

  • Cryogenic truck loading station

  • Specialty gas laboratories

  • Process control

  • Argon purification plant

  • Steel industries

  • Chemical plants

  • Welding gas control

  • Helium liquefaction plants

  • Gas management system

  • Semiconductor manufacturing

  • Quality control for truck fills and gas cylinders



​File Size​

Model 2120XL Brochure


​M​odel 2120XL Manual


Model 2120XL Declaration of Conformity