ENDA-5000 series

Stack Gas Analysis System

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

HORIBA has over 100,000 CEM systems installed and 30 years of quality and experience. That is the base on which HORIBA's new ENDA-5000 series of stack-gas analysis systems are built. These systems have a small footprint and use cross-flow modulated non-dispersive infrared (NDIR) and magneto-pneumatic detectors that are inherently drift-free. The ENDA-5000 series are superior continuous analysis systems that perform reliably for difficult exhaust gas measurements, when measurement errors cannot be tolerated. This CEM series features a new intuitive touch panel that makes every operation available with the touch of a single button. The ENDA-5000 series systems are also designed for ease of maintenance. They are ideal for a variety of uses, including emissions monitoring from steam boilers, refuse incinerators, and electric power generation plants to assure pollution standards are being met.


Segment: Process And Environment
Division: Combustion
Base product
Manufacturing Company: HORIBA Ltd.
  • 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
    ENDA-5000 series can be installed almost anywhere, with ample room on all sides for easy access and much easirer 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.

    1. Complies to world environemental regulations by local engineering

      * Please consult HORIBA for further details.

      <Other Features>

    2. Continuous simultaneous measurement of up to 5 components with one system
      HORIBA's innovative optical technology enables ENDA-5000 series measure up to five components which can be arranged any combination.
    3. Correction for interference
      The interference correcting sensor uses a unique interference filter to compensate for the influence of interference by other gases.
    4. Better alerts and extra alerts
      In addition to the alert functions available in the past, the ENDA-5000 series feature extra alert functions. A continuous checking process can prevent the unit from stopping due to a failure, reducing the risk of failed measurements and assuring consistent operation.
    5. Dramatically reduced correction time for SO2
      Corrections of SO2 measurements using wet base methods of the past took a great deal of time (about 15 minutes), but with the ENDA-5000 series' dry base method, correction takes only three minutes.









    Measurement methods





    Magneto-pneumatic detection



    200~5000 ppm

    200~5000 ppm

    200~5000 ppm

    5~25 vol%

    10~25 vol%



    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


    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*3

    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)


    Touch panel LCD (backlight) (four usable lines)



    -5 to 40 °C (away from direct sunlight and radiation heat )*4


    85% or less (no condensation)


    100 Hz, 0.3 m/s2or less


    Standard environment or better

    Measuring Gas Condition


    250 °C or lower


    0.1 g/Nm3 or less

    Standard gas composition*5

    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


    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


    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


    Semi-gloss Munsell 5Y7/1 on all inner and outer surfaces

    *1: No carrier gas cylinder is required.

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

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

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

    *5: 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.

    Solid Waste Combustors and Incinerators in Solid Waste Management and Remediation Services
    Solid Waste Combustors and Incinerators in Solid Waste Management and Remediation Services
    ENDA-5000 Brochure English
    Size 2.42 MB


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