Probe Type Gas Analyzer TDLS8100

Yokogawa’s new TDLS8100 continues to house all of the industry’s leading features from the TDLS8000, but now only requiring a single-flange installation. An in-situ measurement with a probe removes the requirement for sample extraction and conditioning and can be used in a variety of aggressive process conditions.

Built upon Yokogawa’s second generation of TDLS analyzers, the platform still retains its improved reliability, ease of installation, and reduced maintenance requirements, but now does so with a lower total installed cost for O2, CO/CH4 , and NH3 measurements.

Features and Benefits

Reduced Installation and Maintenance Costs

  • Single-flange design allows for installations where cross-duct TDLS technology was not feasible due to obstructions or accessibility issues
  • Onboard diagnostics with 50 days of data and spectral storage ensure that minor issues can be identified before they become more serious problems
  • Fully field repairable
  • Explosionproof/flameproof for installation in CID1/Z1 or CID2/Z2 areas
  • HART and Modbus TCP come standard to maximize remote diagnostics and configuration capabilities with a single cable run

Accurate Measurements with Quick Response Time

  • 2 second measurement update period with an optional 1 second update
  • An in-situ probe eliminates sample lag introduced by comparable extractive technologies


  • Reference Cell
    Internal reference cell in the laser/detector module ensures peak locking
  • Auto-gain
    Auto-gain enables a wide signal range during dynamic process events

 Auto gain graphs

  • Validation
    Initiated manually, remotely, or automatically on a daily, weekly or monthly basis defined by the user
  • SIL2 Certified
    IEC61508 SIL designed & approved, SIL2 capability for single analyzer use, SIL3 capability for dual analyzer use.

System Configuration 

Standard Configuration with Remote YH8000 HMI

  • Connect up to 4 analyzers simultaneously
  • Can be used with TDLS8000 and/or TDLS8100 probe

System configuration with remote HMI.

Standard Configuration with DTM/DD Devices

  • Connectable with FieldMate or other DTM/DD compatible device management software using HART communication.Standard system configuration.
  • Mini Display on Analyzer Head



Seamless User Interface

Intuitive 7.5 inch color LCD Touch Screen

  • Straightforward Operation
  • Displays all information including trend graphs and eliminates the need  for PC maintenance
  • Can be installed remotely
Trend graph setting


Fired Heater Combustion Safety and Lifecycle Management

Yokogawa's TDSL8100 O2 and CO + CH4 measurements provide reliable information to achieve:

  • Improved combustion efficiency
  • Safer operation of process assets
  • Longer lifetime of coils and coil hangers
  • Increased throughput and lowered emissions

Limiting O2 Concentration and Process Oxygen Measurements

Measuring O2 for Safety/Process Monitoring & Control with Yokogawa's TDLS8100 O2 analyzer achieves:

  • Eliminating the need for sample extraction
  • Near real time measurement analysis
  • Interference free measurements 
  • Reduced costs and time associated with routine maintenance

Standard Specifications

Measurement object O2, CO, CO/CH4, NH3, HCl
Measurement system Tunable diode laser spectroscopy
Measured components and range Measured component Min. range Max. range
O2 0-1% 0-25%
CO(ppm) 0-200 ppm 0-10,000 ppm
CO+CH4 CO 0-200 ppm 0-10,000 ppm
CH4 0-5 %
NH3 0-30 ppm 0-50,000 ppm
HCl 0-50 ppm 0-5,000 ppm
Probe Length 0.7m, 1.0m, 1.5m, and 2.0m

Output signal
(Analog Output)

2 points, 4 to 20 mA DC
Output types; Gas concentration, Transmission, Process gas temperature, Process gas pressure
Output range; 3.0 to 21.6 mA DC
Digital communication HART, Ethernet

Contact outputs
(Digital Output)

2 points, contact rating 24 V DC, 1 A
Function: Activate during Warning / Calibration / Validation / Warm up / Maintenance conditions
Function: Activate during normal condition, not activate during fault condition or when the system power is off
Valve control output 2 points
Function; Activate calibration or validation solenoid valves for zero, span or validation gas
Output signal; 24 V DC, 500 mA Max. per terminal
Alarm Warning;
Gas concentration low/high, Transmission low, Process pressure low/high, Process temperature low/high, Validation required, Validation failure, Zero/Span calibration error, Non process alarm, External alarm
Laser module temperature low/high, Laser temperature low/high, Detector signal high, Peak center out of range, Reference peak height low, Absorption too high, Transmission lost, Reference transmission low, Reference peak height high, Laser unit failure, Laser module error, File access error, E2PROM access error.

Contact inputs
(Digital input)

2 points
External alarm/Calibration start/Validation start/Stream switch
Contact specification;
Zero voltage contact input
Input signal; Open signal;
100 kΩ or more, Close signal; 200 Ω or less

Input signal
(Analog input)

2 points, 4 to 24 mA DC
Input types; Process gas temperature, Process gas pressure
Self-diagnostics Laser Unit temperature, Sensor Control Unit temperature, Laser temperature, Detector signal level, Memory read/write function, Peak locking condition
Calibration Calibration method; Zero/Span calibration
Calibration mode; Manual, Auto, Local initiate (HMI)
Validation Validation method; Up to 2 points
Validation mode; Manual, Auto, Local initiate (HMI)
Power supply 24 V DC ±10%
Warm-up time 5 min.
Protection degree IP66, NEMA Type 4X
Hazardous area classifications Division 1, Zone 1; Explosion-proof/ Flame-proof type; FM, cFM, ATEX, IECEx (Pending)
Process gas condition Process gas temperature: Max 600°C
Process gas pressure: 90 to 500 kPa abs.
Process gas flow velocity: 1 to 30 m/sec
Installation condition Ambient operating temperature: -20 to +55°C
Storage temperature: -30 to +70°C
Humidity: 0 to 95%RH at 40°C (non-condensing)
Additional Specifications

Cable entries; 1/2 NPT or M20x1.5mm, one hole and 3/4 NPT or M25x1.5mm, three holes
Purge gas connections; 1/4 NPT or Rc 1/4
Recommended purge gasses;
  O2 analyzer: N2 (99.99% or greater, application dependent)
  CO, CO/CH4, NH3, and HCl analyzers: N2 (99.99% or greater, application dependent) or instrument air


Measurement gas Repeatability Linearity
O2 ± 1% reading or ± 0.01% O2, whichever is greater ± 1% F.S.
CO (ppm) ± 2% reading or ± 1 ppm CO, whichever is greater ± 1% F.S.
CO + CH4 CO ± 1% reading or ± 1 ppm CO, whichever is greater ± 2% F.S.
CH4 ± 4% reading or ± 0.02% CH4, whichever is greater ± 4% F.S.
NH3 ± 2% reading or ± 1 ppm NH3, whichever is greater ± 2% F.S.
HCL ± 1% reading or ± 2.5 ppm H2O, whichever is greater ± 2% F.S.

YH8000 HMI Unit

Display Touchscreen 7.5 inch TFT color LCD panel, 640 x 480 (VGA)
Communication Ethernet; RJ-45 connector, Communication speed; 100 Mbps
Protection degree
of enclosure
IP65, NEMA Type 4X
Weight 4 kg
Mounting Analyzer mount (Front, left-side, right-side) with tilt function, Pipe mount or Panel mount
Cable Entries 1/2NPT or M20 x 2
Ambient operating temperature; -20 to 55℃
Storage temperature: -30 to 70℃
Humidity: 10 to 90%RH at 40℃ (Noncondensing)
Power Supply 24 V DC ±10%
Hazardous area
Division 2, Zone2: Non-Incendive/Type n; FM, cFM, ATEX, IECEx



Industrial Combustion sources such as thermal cracking furnaces and, process heaters play a critical role in the process industry.


Why Traditional Methods Fall Short of TDLS

Yokogawa’s TDLS8100 probe style analyzer operates on the principle of Tunable Diode Laser Spectroscopy (TDLS) and uses near-infrared (NIR) light to make process gas measurements. The TDLS8100 is an ideal solution for both oxygen and carbon monoxide measurements in process furnaces that have aggressive and corrosive components. The analyzer sensor is not in direct contact with the process and provides < 5-second response all while reducing time and costs associated with regular maintenance. The single flange entry allows direct replacement of conventional oxygen analyzers.


In maintaining and managing industrial plants, monitoring waste water pH/ORP is both a legal obligation and an unavoidable necessity for protecting the environment. Monitoring without an attentive eye can lead to severe consequences.


In this eBook we explain how to improve fired heaters safety & efficiency by controlling combustion using TDLS technology. Download it now and learn:

  • The 4 top industry challenges related to fired heaters
  • How to efficiently and safely manage combustion
  • How TDLS technology can improve operational excellence in fired heaters
Validate don't Calibrate! What is the difference between TDLS Calibration and Validation?
Edition 1

Validate don't Calibrate! What is the difference between TDLS Calibration and Validation?


Hydrocarbon Processing article discussing tunable diode laser (TDLS) gas analysis for combustion management in fired heaters | June 2015.




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