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ENDA-5000 Stack Gas Analysis System

ENDA-5000 Stack Gas Analysis System

Continuous simultaneous and high-precision measurement of NOx, SO2, CO, CO2, O2 and N2O.

The ENDA-5000 series are superior continuous analysis systems that are perfect in the difficult field of exhaust gas measurement, where measurement errors cannot be tolerated.
These systems have a smaller footprint, and use cross-flow modulated non-dispersive infrared (NDIR) detection with a magnet-pneumatic detection method that is inherently drift-free.
The ENDA 5000 series feature an intuitive touch panel that makes every operation available with the touch of a single button.
The ENDA-5000 series are also designed for faster, more efficient maintenance. They are ideal for a variety of uses, including monitor steam boiler, refuse incinerator, and electric power generation plant emission to assure pollution standards are being met.


Long-term stability : Cross-flow modulated non-dispersive infrared (NDIR) detection is renowned for long-term stability

    1. No need for optical adjustments
      With  NDIR, the sample gas and reference gas are intromitted into a single measurement cell alternately to obtain modulation signal. Therefore there is no need to adjust two different optical paths so that they are balanced.
    2. A stable zero point
      Since ENDA-5000 series output the difference between the measured gas and the reference gas each time measurement occures (once a second), the zero point is extremely stable.
    3. Continuous cleaning keeps the cell clean
      Since cleaning air is fed into the sample cell in between each batch of sample gas, the cell resistes contamination and normally remains clean.This reduces span drift and makes the equipment safe and stable for long periods of time.

Compact : Body yields wider maintenance area

The ENDA-5000 series can be installed almost anywhere, with ample room on all sides for easy access and much easier maintenance.

Easy to use : Features an intuitive touch panel

The operator can easily switch between the corrected and converted density settings screens or view alert information with touch of a single button.

Complies to world environmental regulations by local engineering


Model ENDA-5000
Component*1 NOx SO2 CO CO2 O2*2
Measurement methods NDIR NDIR NDIR NDIR Magneto-pneumatic detection
Range*3 Standard 200~5000 ppm 200~5000 ppm 200~5000 ppm 5~25 vol% 10~25 vol%
  Option 100 ppm~ 50 ppm~ 100 ppm~
Range Ratio Within a factor of 10 Within a factor of 10 Within a factor of 10 Within a factor of 5 Within a factor of 2.5
Repeatability Within 0.5% of full scale/week (with optional range, or during O2 measurement, ±1.0% of full scale/week)
Linearity (indicator error) ±1.0% of full scale
Zero drift ±1.0% of full scale/week (assuming surrounding temperature is maintained within 5 °C)
(with optional range, or O2 measurement, ±2.0% of full scale/week)
Span drift ±2.0% of full scale/week (assuming surrounding temperature is maintained within 5°)
Response time*4 Within 60 seconds (Td + T90 from equipment intake area) (sample flow 0.6 L/min.) (within 240 seconds for SO2 only)
Overall interference from co-existing gases ±2.0% of full scale (within standard range, with standard gas formation)
Display Touch panel LCD (backlight) (four usable lines)
Temperature -5 to 40 °C (away from direct sunlight and radiation heat )*5
Humidity 85% or less (no condensation)
Vibration 100 Hz, 0.3 m/s2or less
Dust Standard environment or better
Measuring Gas Condition Temperature 250 °C or lower
Dust 0.1 g/Nm3 or less
Standard gas composition*6 NO: 500 ppm or less; NO2: 15 ppm or less; SO2: 1000 ppm or less; SO3: 50 ppm or less;
CO: 200 ppm or less; CO2: 15% volume or less; H2O: 20% volume or less
Sampling method Dry sampling using an electric cooler
Sample gas flow 2.5 L/min~3.0 L/min
Sample inlet tube Teflon tubing (Ø8/Ø6 mm)
Sample gas pressure ±4.9 kPa (three points selected)
(with no sample gas back pressure)
(1) -1.96 to 4.9 kPa
(2) ±3.43 kPa
(3) -4.9 to 1.96 kPa


Pressure control Pressure control uses a regulator and pump; Reduced pressure sampling; Control pressure: -4.9 kPa
Output DC 4 to 20 mA (absolute output) (DC 0 to 16 mA/DC 0 to 1 V/DC 1 to 5V optional) Max. 12 output systems
External output Analysis alerts, analysis warnings, range display, corrections, conservation, purging (option)
Contact capacity: DC 30 V 1 A, AC 250 V 1 A resistance load
Correction method Dry correction, automatic correction (correction cycle: 7 days standard, can be adjusted to between 1 and 99 days), manual correction
Calibration gas Zero gas With measurement method authorization: N2, When there is no measurement method authorization: N2 or ambient air
O2 carrier gas Ambient air
Span gas Gas cylinder for each component measured (when there is no measurement method authorization: O2 or ambient air can be used)
Probe collection point filter Flange: JIS 10K, 40 AFF; Sample probe tube length: 1000 mm; Material: SUS-316 stainless steel;
Filter element: SUS-304 stainless steel and 2um-pleated quartz wool; Electric heater: 100 VA, with water droplet proof case
Power supply AC 100 V ±15 V(85 V~115 V)
Power frequency 50/60 Hz (switchable)
Power consumption About 800 VA (heated piping 30m: +1100 VA; heater in tray: +300 VA)
Exterior dimensions/Mass 600 (W) x 1770 (H) x 300 (D) mm (high pressure gas cylinders, 3.4 L cylinders, maximum of 3 cylinders); About 180 kg (not including cylinders)
600 (W) x 1770 (H) x 300 (D) mm (high pressure gas cylinders, 3.4 L cylinders, maximum of 3 cylinders); About 200 kg (not including cylinders)
Materials in contract with sample gas SUS-316 stainless steel, SUS-304 stainless steel, Teflon, polypropylene, polyethylene,
flourorubber, PVC, PVDF, and glass
Enclosure Independent outdoor installation
Plate thickness: Main unit, doors, top plate, steel plate: 2.3 mm; Channel base: 3.2 mm; Doors: front opening; Interface: right front
Color/Finish Semi-gloss Munsell 5Y7/1 on all inner and outer surfaces

*1: CH4 and N2O measurement are also available. Please contact us for more information.

*2: No carrier gas cylinder is required.

*3: Up to two ranges are supported for each component.

*4: Response time may vary depending on the sampling system composition.

*5: Support is available for -15 to 40 °C (cold-climate version) and 5 to 50 °C.

*6: An NH3 scrubber is available as an option for cases where a combined gas includes NH3. SO2 measurement corrected for CH4 interference is available for cases where there is CH4 in the sample gas for SO2 measurement. CO measurement corrected for N2O interference is available for cases where there is N2O in the sample gas for CO measurement.


  • Gas Monitoring Power Plant
  • Solid Waste Combustors and Incinerators in Solid Waste Management and Remediation Services
  • Nitrous Oxide Monitoring for Greenhouse Gas Reduction
  • Monitoring of SO2 for Flue Gas Desulfurization

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