HORIBA GI-700 series Stack Gas Analyzer

Increase your CEMS Capabilities with a HORIBA Multi-gas Analyzer

Experience HORIBA, the Global Single Source Solutions Provider with over 50 years of technological advancements and unparalleled reliability, dependability and operability.The GI-700 stack gas analyzer is designed to continuously measure the concentrations of nitrogen oxides (NOx), sulfur dioxide (SO2), carbon monoxide (CO), carbon dioxide (CO2), oxygen (O2), and ammonia (NH3) in stack flue gas streams.

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  • Ultimate Dependability
    Proven cross-flow modulation technique
    Continuous base line validation
  • Ultimate Low cost ownership
    Up to 6 gases can be measured using a single analyzer with multiple detectors. Works with a simple sampling unit having less tubing, fewer power cables. Simplified wiring translates into less time required for installation. Minimum function for the operation. Any additional functions can be added from controlling PLC.
  • Ultimate Sensitivity
    5 ppm High-Precision measurement (NOx, SO2 and CO) is available.
  • Others
    – An external converter provides for separate measurements of NO and NO2.
    – All component modules can be easily installed with in a single 19 inch case. The compact design saves space, facilitates maintenance and requires less wiring and tubing during installation.
    – Power consumption is reduced by approximately 50% as compared to systems using individual analyzers (NH3 analyzer).
  • User Friendly

  • Various Applications include:
    Stack emission monitoring, SCR control, Desulfurization control, Greenhouse gas monitoring, Boiler emissions measurements, Gas separation, Coal and gas fired emission sources,  incinerator emissions monitoring…


Model GI-700
Component NOx SO2 CO CO2 O2 NH3*3
Measurement methods*1 NDIR
Range*1 Standard 10~5000 ppm 10~5000 ppm 50~5000 ppm 5~25 vol% 10~25 vol%  10-100
  Optional 5 ppm~ 5 ppm~ 5 ppm~ 10 vol%~  –
Range Ratio*1 Standard 1:10 1:10 1:10 1:5 1:5 1:10
Optional 1:20 1:20 1:20*2 1:5
Indicated error
± 1.0 % of full-scale value for each component and range (Standard range ratio)
± 2.0 % of full-scale value for each component and range (Optinonal range ratio)
Zero drift ± 1.0%/week of full scale (standard range) (if the ambient temperature change is ≤ 5°C)
± 2.0%/week of full scale (optional range and O2 carrier specification O2 analyzer) (if the ambient temperature change is ≤ 5°C)
Span drift ± 2.0%/week of full scale (if the ambient temperature change is ≤ 5°C)
Response time T90=45s from the analyzer inlet
Interference ±2.0% of full scale
Temperature 0° to 40°C (No direct sun light or no radiation heat)
Humidity ≤ 90%
Vibration 100Hz, 0.3m/s2 or less
Dust Less than environment standard
Measuring Gas Condition Temperature Ambient temperature
Dust None
Standard gas composition NO :Up to 5000 ppm
NO2: None
SO2: Up to 5000 ppm
SO3: None
CO :Up to 5000 ppm,
CO2:3 vol% to 15 vol%
O2  :0.2 vol% to 15 vol%
HCl : None
H2O: Saturated at 5°C
Sample inlet tube Polytetrafluoroethylene tube (6 mm O.D./4 mm I.D.)
Sample gas pressure Atmospheric pressure ± 4 in. W.C.
Pressure control Not including (Vacuum regulator (-9.8 kPa))
Output(Option) Analog output: 6 channels 4-20mA, 0-1V, 0-5V
Digital input: 8 channels 24V/10mA
Digital output: 16channels 24V/0.5A
Calibration gas Zero gas : Nitrogen
Span gas : Gas to be measured
Carrier gas for (Oxygen analyzer Nitrogen (for N2 carrier specification), Air (for air carrier specification)
Air for ozone generation Dry air (saturated at ≤ -30°C)
Power supply 100 – 240 VAC (Depends on components)
Power frequency 50/ 60 Hz for common use
Power consumption 240 VA
Exterior dimensions/Mass 5U below in (H)19 in. (W)22 in. (D) / Approx. 19kg (depends on the incorporated components)
Materials in contract with sample gas PTFE, Nylon, PP, FKM, SS304, SS316
Serial Communications ModbusTM, Ethernet (Modbus address will be disclosed)
*Modbus is a trademark of Schneider Electric Inc.

*1: Depends on measurement range specifications.
*2: A range ratio of 1: 40 is also possible for special applications.
*3: A range ratio of CLA NH3 and CLA NOx should be 1: 5 or less.



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