ENDA-5000 Stack Gas Analysis System


Over 100,000 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 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 analysis systems that are perfect in the difficult field of exhaust gas measurement, where measurement errors cannot be tolerated. The 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 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 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.

  • Correction for interference

The interference correcting sensor uses a unique interference 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 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.

US Patent No. 5,966,676

  • 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.

  • A variety of types functions (up to 12 kinds of output)

Instantaneous output (NOx, SO2, CO, CO2, O2)

O2 calculated output values (NO2, SO2, CO)

Moving average values (for one to four hours)

HORIBA's NDIR method, trusted through years of experience


Dual optical path comparison

The sample gas and reference gas are each put in different cell for measurement.

  • This method is appropriate for laboratory use and other kinds of batch measurement.
  • Differences in the cleanliness of the two optical paths results in signal variation.
  • Keeping the cells clean requires periodic cleaning
  • During transport, and inspection, and whenever the unit is subject to vibrations, fine adjustment by a skilled service person is required.


With magneto-pneumatic detection, there is no need for cylinder carrier gas>

The ENDA-5000 series use magneto-pneumatic detection to measure O2. Since the sample gas does not come into direct contact with the detector, there is no deterioration due to corrosion, which enables long-term stable operation. What’s more, thanks to HORIBA’s innovative technology, in which ambient air is used as a carrier gas, there is no need for a carrier gas supply, which translates into lower costs.



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/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.


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

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