700 Series CLD NOx Analyzer

California Analytical Instruments introduces their latest 700 CLD analyzer...


  • Measures From Low 3 ppm up to 3,000 ppm Full Scale

  • Three Measurement Modes—NO, NOx and NO/NO2/NOx

  • Auto Calibration and Ranging

  • Fast Response Time

  • Electronic Sample and Ozone Flow Control

  • Does Not Require Vacuum Pump

  • Comprehensive Diagnostics

  • Output Options: Voltage, Current, RS-232, TCP/IP, MODBUS

  • CE Mark and ETL Listed—Conforms to UL STD 61010-1, Certified to CAN/CSA C22.2 STD No. 610610.1

  • Meets 1065 Requirements


  • Stack Gases (CEM)
  • Combustion Efficiency
  • Turbine/Generator Feedback Control
  • Process Chemical Gas Analysis
  • Personnel Safety
  • Vehicle Emissions
  • Fuel Cell Analysis


  • Paramagnetic Oxygen Channel
  • Internal Sample Pump
  • Internal Zero and Span Solenoid Valves
  • 19 Inch Rack Mount Slides


The California Analytical 700 Series CLD Analyzer utilizes the principle of chemiluminescence for analyzing the NO or NOx concentratoin within a gaseous sample.

- In the NO mode, the method is based upon chemiluminescent reaction between ozone and nitric oxide (NO) yielding nitrogen dioxide (NO2) and oxygen. This reaction produces light which has intensity proportional to the mass flow rate of NO2 into the reaction chamber. The light is measured by means of a photodiode and associated amplification electronics.

- In the NOx mode, NO plus NO2 is determined as above, however, the sample is first routed through the internal NO2 to NO converter which converts the NO2 in the sample to NO. The resultant reaction is directly proportional to the total concentration of NOx.

Method of Operation - O2

The 700 Series CLD optional oxygen channel utilizes the paramagnetic method to determine the percent level of oxygen contained in the sample gas. The oxygen level is displayed on the LCD panel in engineering units.


Detector: Chemiluminescence (CLD) Photodiode
NO/NOx Ranges: Four User-definable from 0-3 to 0-3,000 ppm NO/NOx (Higher Ranges Available upon Request)
Optional Paramagnetic Oxygen: 0-25%
Response Time: Typically < 2 Seconds to 90% Full Scale
Repeatability: Better than 0.5% of Full Scale
Linearity: Better than 1% of Full Scale
Noise: Less than 0.5% of Full Scale
Zero & Span Drift: Less than 1% of Full Scale per 24 Hours
CO2 Effect: Less than 2% with 10% CO2
Additional Interference Data: CO 1000 ppm – N/A
HCN 28 ppm - N/A, SO2 500 ppm – N/A
NH3 10 ppm – N/A, N2O 201 ppm – N/A
Flow Control: Electronic Proportional Pressure Controller
Sample Flow Rate : Typically 1.5 to 2.5 LPM (0.6 LPM with Low Flow Option)
Converter: Carbon Material @ 205 C; 95 to 100% Efficiency
Ozonator: Ultraviolet Lamp
Air or O2 Requirements: Dry Air less than 0.01 ppm NOX at 240 cc/Min. @ 25 psig (Dew Point < -10oC
NO/NOx Control: Manual/Remote/Auto Cycle (Remote NOx mode by dry contact closure)
Outputs Available: TCP/IP, RS-232, Modbus, Four Scalable Analog 0-10V/4-20mA
Discrete Alarms: General Fault/ TTL Logic (Ground True) Calibration Failure/TTL Logic (Ground True) High Concentration (2 each)/ TTL Logic (Ground True)
Digital Diagnostics: Converter Temperature, Cell Temperature, Photodiode Temperature, Air Pressure, Flow Rate & EPC Control Voltage, Sample Pressure
Display: Back lit LCD
Sample Temperature: 50°C Noncondensing
Ambient Temperature: 5 to 40°C
Ambient Humidity: Less than 90% RH (Non-condensing)
Warm Up Time: 1 Hour
Fittings: 1/4 Inch Tube
Power Requirements: 115/230 (±10%) VAC; 50/60 Hz; 560 Watts
Dimensions: 5¼ H x 19 W x 23 D (Inches)
Weight: 48 Pounds

700 Series CLD NOx Analyzer
Item # CAI 700CLD 

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