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The Teledyne ML®660 conventional extractive system is designed to extract and condition hot, wet stack gas for a dry basis measurement of any combination of SO2, NOx, CO, CO2, and O2. This system can be configured specifically for 40CFR60, 40CFR63, 40CFR75 compliance, and process control applications.





The ML®660 or 660 ®Open Architecture (OA) is a pre-engineered Continuous Emissions Monitoring System (CEMS) designed for use in EPA 40 CFR Part 60 and Part 75, International Directives, compliance applications and for process control.  This system can be configured to accurately measure SO2, NOx, NH3, CO, CO2, and /or O2 on a dry basis.

Both configurations of the ML®660 CEMS consist of a heated probe, heated sample umbilical, and single bay cabinet. Each system includes analyzers, control equipment, and a sample conditioning package.  Using conventional extractive principles, a vacuum pump draws unconditioned, temperature controlled (above dew point) stack gas through the filtered probe, heated sample line, and into the sample conditioner where moisture and fine particulate are removed. The now dry, cool stack gas is delivered to a sample manifold for distribution to each analyzer. 

A controller performs all automatic sequencing of the sample cycle, daily calibration cycle, and back purge cycle.  During calibration mode, zero and span gases are injected into the probe head to comply with EPA calibration requirements.  Back purge air is delivered to the probe on a periodic basis to clean the heated probe filter, providing months of continued operation without maintenance.

In addition, the controller has the ability to log fuel flows and provide the required analog outputs in units of diluent corrected ppm concentration (ppmc), lb/mmBtu, lb/hour and metric units. Standard relay outputs that signal system status and fault information are also generated from the controller.  A RegPerfect® Data Acquisition System (DAS) may be attached to the controller via Ethernet to provide long term data collection, compliance report generation, remote control and diagnostic information.

The ML®660 is a self-contained system requiring single point attachment for power, instrument air, and calibration gases.  All utility distributions are routed through the ML®660 internally. No duplication of utilities is required on the stack.




  • ​​​EPA certifiable for all 40 CFR 60 and 40 CFR 75 applications.  
  • This system is well suited to generate reliable and accurate process control information.  Typical applications include gas turbines, industrial sources, and power boilers.
  • State of the art TML T-Series® analyzers are utilized for pollutant monitoring.  This allows a single source for system as well as analyzer support.
  • Automatic, local and  remote initiation of any system sequence is available. This includes the ability to zero and span a single analyzer both through the entire sampling train or directly at the analyzer to diagnose sampling system  anomalies.
  • Minimal maintenance is required. Weekly manual calibrations, quarterly probe checks, and quarterly filter changes are typically all the system requires to achieve uptime of 95% or greater.
  • Self-diagnosing alarm package.  The ML®660 will alarm the user for sample train heater failures, sample conditioning failures, probe and sample line pluggage, and analyzer faults.  This system is smart enough to protect itself during a fatal fault condition thereby eliminating the possibility of moisture contamination.



Standard 316L Stainless Steel or Hastelloy probe straw
EPA approved lengths

2 micron filter standard, other sizes available

Heated probe filter maintained above 250°F [121°C]

Insulating jacket provided



¼" [.95 cm] Teflon calibration line

½" [0.64 cm] Polyethylene backpurge line

14 AWG triad for probe heater power

Fire retardant jacket



3/8" [0.95 cm] Teflon or 316 Stainless Steel sample tube

Recommended maximum length 250 feet [76.2 meter]

Line temperature controlled to 300°F [148°C]

Low temperature alarm provided to Controller

Insulated fire retardant jacket



Thermo-electric cooler

Negligible loss of  NO2 and SO2

Teflon diaphragm pump

Peristaltic moisture drain pump

2 micron Teflon sample filter

Water slip alarm, sample dew point alarm

Probe and sample line vacuum alarm



Single bay, 19" [48.3 cm] Rack Mount

Standard NEMA 12 with fan ventilation or HVAC.

Other NEMA ratings are available.

Dimensions 81"H x 25"W x 39"D [2.0 x 0.6 x 1.0 meter]  Approx. 400lbs.[181Kg]

Front door and rear doors, removable side panels, sight glass available

Lifting lugs and/or castors can be provided



Open rack with optional desk.

Dimensions  80"H x 63"W x 30"D [2.0 x 1.6 x 0.8 meter] Approx. 300lbs. [136Kg]

Sample Conditioning Plate.

28"H x 24"W x 9"D [0.7 x 0.6 x 0.2 meter] Approx. 60 lbs. [27Kg]



GE or Allen Bradley Controller, C3io provides data buffering, digital inputs, digital outputs, analog inputs,  analog outputs, and Ethernet communications. Optional HMI provided for manual system control.



Model Number T300, for CO

Model Number T200, for NOX

Model Number T100, or SO2

Model Number T201, for NH3

Model Number T360, T801, T802, T803 for O2/CO2



CO            0-5000ppm

NOx           0-5000ppm

SO2           0-5000ppm

O2             0-5/10/25%

CO2           0-2000 to 0-3000, 0-10/15/20%

NH3             0-20ppm



± 20% of Reference Methods for 40 CFR 60

± 7.5% (better than ± 10.0%) of Reference Methods for 40 CFR 75



Less than 90 seconds to 95% full scale from system inlet



Zero and Span

± 0.5% absolute for O2/CO2%         

± 2.5% of full scale for CO, NOX, NH3, and SO2 ppm


REPEATABLILITY:  ± 1% of full scale

PROCESS:  80-1800°F [27-982°C] , up to 50% moisture

AMBIENT:  Varies by Engineered Enclosure

SYSTEM UTILITIES:  -40°F [-40°C] dew point instrument air, 80 psig [551.6 KPa] minimum, 0.5 SCFM [14 lpm] , Single point attachment of 240Vac, single phase, 60 hertz, 50 amp power



  • Regulatory Consultation
  • LightHawk® 560 Opacity Monitor integration
  • LaserHawk® 360 Particulate Monitor integration
  • Ultraflow 150 Ultrasonic Stack Flow integration
  • ​Automatic Linearity's
  • RegPerfect® Data Acquisition System
  • Training
  • Installation supervision
  • Startup
  • EPA Certification
  • Maintenance Contracts


  • Natural gas fired combustion
  • Clean combustion sources measuring low gas concentrations
5/22/2018 2:47 PMJon Adams
5/22/2018 2:47 PMJon Adams


The following table provides a list of items that need regular maintenance to ensure your product remains in good working condition.  See manual section 6 for detailed instructions and appendix A for checklists.

Description Weekly Monthly Quarterly Yearly
Recalibrate the analyzers X      
Inspect sample pump   X    
Inspect NOx exhaust pump   X    
Replace NH3 scrubber assembly     X  
Replace O3 scrubber media     X  
Clean heated sample line       X
Rebuild sample pump       X
Rebuild NOx exhaust pump       X
Analyzer Maintenance (refer to individual analyzer manual) X X X X
Inspect probe filter and gaskets   X    
Inspect heated sample line for condensation or particulate build up   X    
Inspect probe straw   X    
Inspect all valves and tubing X      
Inspect instrument air coalescing filter X      
Analyzer particulate filter X      
Inspect HVAC (refer to HVAC manual) X X X X
Inspect Sample Chiller Teflon filter X      
Replace Sample Chiller Teflon filter       X
DAS Server (refer to DAS manual)     X  
Replace Smoke/Heat Alarm 9VDC Battery     X  ​