Microprocessor Control

Advanced Gas Analyzers

2-Year Warranty


Model 418 NDIR Luft Gas Analyzers: Single Gas dual beam luft detector
More standard features, better design, more reliable data, longer warranty, better service support. CE marked and suitable for research, compliance monitoring, and specialty testing applications.

gas analyzers
Series III


ndir gas analyzer
NDIR Luft Detector Model 418

The Model 418 relies on the non-dispersive infrared (NDIR) principle of gas measurement and features a gas filled Luft detector for highly specific gas detection. See seperate data sheet for particular gases and application notes.



The Signal Instruments model 418 Infrared Gas Analyzer is designed for the continuous monitoring of CO, CO2, SO2, NO, NH3, NF3, SF6, N2O, CFCs or Hydrocarbons for research, toxic gas measurement and semiconductor gas applications.

The gas analyzer has a totally automatic microprocessor-based operation including auto-calibration and auto-range . This makes the instrument ideal as a "smart" stand-alone unit or as a "building block" for systems integration via a RS-232 communications port or remote contact closures. Automatic diagnostics and fully-configurable alarms are also integral to the gas analyzer.

A large multifunction, backlit LCD provides a clear display of gas concentration measurement, range, sample gas flowrate and the status of critical operating parameters including DC and bias power supplies. The intuitive, menu-driven interface and soft key buttons enable the operator to quickly configure and control the monitor's function. The unit features 19" rack mounting at 4RU height and a weight of only 38 Lb. It has a dual voltage capability of 115 Vac and 230 Vac which is switchable from the rear panel.

Model 418 Dual beam non-dispersive infra-red gas analyzer Data Sheet



Model 418 NDIR Luft Gas Analyzer Specifications:




Detector Type: NDIR Gas filled dual chamber Single Gas Luft detector
Models: NH3, SF6, NF3, CO2, CO, NO, N2O, SO2, CFCs or Hydrocarbon species
Ranges: Dependant on Gas A, B, C, D or E, Auto-ranging standard

A: 100, 500, 1000ppm
B: 1000, 5000, 10000ppm
C: 1, 5, 10%
D: 5, 10, 20%
E: 20, 50, 100%

Response Time: Typically, <15s (T5 to T95)
Gas Flow Rate: 1.0 to 5.0 lpm
Inlet Pressure: (-5.0) to 15 psig, calibration gas: 5 to 30 psig
Accuracy and Repeatability: +/- 1.0% of range or 0.2ppm
Temperature Effects: Zero: <+/- 0.2% per degree C, Span: <+/- 0.35% per degreeC
Detector Noise: Gas and Range dependant
Linearity: < 0.5%
Remote Control: Range, calibration and standby mode via contact closure or RS-232
Outputs: 0-10VDC and isolated 4-20mA concentration and range identifier voltage
Logic Outputs: Range, calibration, gas path, mode and readiness
Alarms: Two configurable concentration alarms, logic outputs and one fault contact set
Power: Dual voltage 115/230 VAC +/- 15%, switch-selectable, 400VA max.
Environment: Temperature: 5-30 degrees C, 95%RH, non-condensing
Dim: 19" rack-mount, 4RU (133.5mm) height, 550mm depth, 18Kg weight
Warranty: 2 Years



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