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The Teledyne ML®661 is a complete engineered CEMS designed to measure total hydrocarbons (THC/VOC) as required in environmental regulatory compliance and process control applications.  Please consult our factory for more information on this product.





The Teledyne ML®661 THC system uses a conventional extractive system design to extract and condition hot, wet stack gas for a dry basis measurement using our sensor-e® THC analyzer, and Zirconium Oxide O2 Sensor.  This system can be configured specifically for 40CFR60/63 emission compliance, and process control applications.  Similar to the extractive system, the Teledyne ML®661 is also engineered to provide a modular and cost effective solution for source monitoring while still allowing for client customization.  An open architecture design is used for easy maintenance.  Specialized equipment can be added for hazardous area classification requirements.


  • EPA certifiable for all 40 CFR 60 and 40 CFR 63 applications including BIF (boilers and industrial furnaces burning hazardous material) applications (40CFR266, Appendix IX, Section 2), and 40CFR503, subpart E sludge burner applications.
  • Well suited to generate reliable and accurate process control information.  Typical applications include cement kilns, 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.  Optional speciated hydrocarbon measurements.
  • 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, and
  • Self-diagnosing alarm package.  The ML®661 will alarm the user for sample train heater failures, air delivery problems, probe and analyzer faults.  This system is smart enough to protect itself during a fatal fault condition ensuring no moisture can contaminate any analyzer.
  • Hazardous area classification model available to meet Class 1, DIV1/2 requirements.​



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 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.



THC with external convertor

Zirconium Oxide Sensor for O2



THC2         0-10ppm

O2             0-100%



± 20% of Reference Methods for 40 CFR 60/63



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



Zero and Span

± 0.5% absolute for O2%         

± 5.0% of full scale for TRS  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 Cylinder Gas Audits
  • RegPerfect®​ Data Acquisition System
  • Training
  • Installation supervision
  • Startup
  • EPA Certification
  • Maintenance Contracts​


  • Oil, gas and petrochemical
  • Cement and lime production
5/22/2018 2:47 PMJon Adams
5/22/2018 2:47 PMJon Adams
3/21/2019 3:55 PMJack Pearson
5/22/2018 2:48 PMJon Adams