ENDA-5000 Stack Gas Analysis System


MCERTS Certified Continuous Emission Monitoring System (CEMS) with high-precision and simultaneous measurement of NOx, SO2, CO, CO2 and O2

Over 100,000 systems installed and 30 years of quality and experience. That is the base on which HORIBA's ENDA-5000 series of Continuous Emission Monitoring System for stack-gas analysis is built. 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 are superior Continuous Emission Monitoring systems (CEMs), fully certified to MCERTS standards, they are perfect for the difficult field of exhaust gas analysis, where measurement errors cannot be tolerated. The series features an intuitive touch panel that makes every operation available with the touch of a button. The ENDA-5000 series systems are also designed for faster, more efficient maintenance. They are ideal for a variety of uses, including monitoring steam boiler, refuse incinerator, and electric power generation plant emissions to assure pollution standards are being met.


  • Continuous simultaneous measurement of up to five components with one system
    The ENDA-5000 series can measure up to five components, thanks to HORIBA's innovative optical technology. Measurements of up to five components can be made in any combination.
  • MCERTs Certifed
    The ENDA-5000 Continuous Emission Monitoring System is certified to the Environment Agency’s MCERTs standard.
  • Correction for interference
    The interference correcting sensor uses a unique filter to compensate for the influence of interference by other gases.
  • Better alerts and extra alerts
    In addition to the alert functions available in the past, the ENDA-5000 series systems 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.
  • 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 system's dry base method, correction takes only three minutes.

Manufactured by HORIBA










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 (with optional range, or during O2 measurement, ±1.0% of full scale)

Linearity (indicator error)

±1.0% of full scale

Zero drift

±1.0% of full scale (assuming surrounding temperature is maintained within 5 °C)
(with optional range, or O2 measurement, ±2.0% of full scale)

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 frrom co-existing gases

±2.0% of full scale/week (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/S2 or 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: 40% 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 cylinder; 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.


ENDA-5000 Stack Gas Analysis System Brochure uploaded on 2014/6/13 (PDF:1.1MB)