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  • Model TDLS8000 Tunable Diode Laser Spectrometer

Model TDLS8000 Tunable Diode Laser Spectrometer

2016-05-29 20:28:48


Yokogawa’s new TDLS8000 houses all of the industry’s leading features in one robust device. The platform design is for in situ measurements which negate the need for sample extraction and conditioning. The non-contacting sensor allows for a variety of process types including corrosive, abrasive and condensing. The first generation platform has been proven in many others for the measurements of O2, CO, CH4, NH3, H2O and many more NIR absorbing gases. This second generation platform has improved reliability and ease of installation and maintenance while still meeting or exceeding designed application demands.……



In-Situ Gas Analyzer TDLS8000


  • SIL2 TruePeak combined with smart laser Technology

  • Intuitive touchscreen HMI

  • HART and Modbus TCP communications standard

  • 8-stage auto-gain adapts to difficult applications

  • Fully field repairable with 50 days of data and spectra storage

  • Compact design for one-man installation without sacrificing ruggedness

  • Area classification Zone2/Div2 or Zone1/Div1

Standard Specifications

Measurement objectO2, CO (+CH4), H2O, NH3 (+H2O) concentration in combustion exhaust gas and process gas
Measurement systemTunable diode laser spectroscopy
Measured components and rangeMeasured componentMin. rangeMax. range
CO(ppm)0-2000 ppm0-10000 ppm
CO+CH4CO0-200 ppm0-10000 ppm
CH40-5 %
NH30-30 ppm0-50000 ppm
H2O (ppm) in non HC0-30 ppm0-300000 ppm
H2O (ppm) in HC0-30 ppm0-30000 ppm
Output path lengthOptical distance between the laser unit and the sensor control unit Standard; 0.5 to 6 m, Max; 30 m
Output signal2 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 communicationHART, Ethernet
Contact outputs2 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 output2 points
Function; Activate calibration or validation solenoid valves for zero, span or validation gas
Output signal; 24 V DC, 500 mA Max. per terminal
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-diagnosticsLaser Unit temperature, Sensor Control Unit temperature, Laser temperature, Detector signal level, Memory read/write function, Peak locking condition
CalibrationCalibration method; Zero/Span calibration
Calibration mode; Manual, Auto, Local initiate (HMI)
ValidationValidation method; Up to 2 points
Validation mode; Manual, Auto, Local initiate (HMI)
Power supply24 V DC ±10%
Warm-up time5 min.
Protection degreeIP66, NEMA Type 4X
Hazardous area classificationsDivision 1, Zone 1; Explosion-proof/ Flame-proof type; FM, cFM, ATEX, IECEx (Pending)
Division 2, Zone 2; Non-Incendive/Type n; FM, cFM, ATEX, IECEx
Process gas conditionProcess gas temperature; Maximum 1500℃
Process gas pressure; Max. 1 MPa, Min. 90 kPa
Dust in process gas; 20 g/m3 or less
Installation conditionAmbient operating temperature; -20 to 55℃
Storage temperature; -30 to 70℃
Humidity; 0 to 95%RH at 40℃ (Non-condensing)
Mounting flange type; ASME B 16.5, DIN, JIS
Gas connections; 1/4 NPT or Rc1/4
Purge gas;
 Recommended purge gasses
 O2 analyzer: N2 (99.99% or greater, application dependent)
 H2O ppm analyzer; N2 (99.99% or greater with < 20 ppm H2O for feed to the optional dryer package)
 CO, NH3 analyzer: N2 (99.99% or greater, application dependent) or Instrument air
Purge gas flow rates;
 5-20 L/min for optic
 5-30 L/min for process window
Purge gas connections;
 1/4NPT (-G1, -C2, -D2, -C2, -D1, -C1),
 Rc1/4 (-G2, -S2, -E2, -J2, -E1, -J1)


Measurement gasRepeatabilityLinearity
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 + CH4CO± 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.
H2O (ppm) in non
± 2% reading or ± 0.1 ppm H2O, whichever is greater± 1% F.S.
H2O (ppm) in HC± 2% reading or ± 0.1 ppm H2O, whichever is greater± 1% F.S.

YH8000 HMI Unit

The YH8000 is a HMI designed specifically for the Tunable Diode Laser Gas Analyzer, the TDLS8000.

  • Touchscreen 7.5 inch color LCD on HMI

  • Makes it simple to operate

  • Can be remotely installed

  • Up to 4 units connection available


DisplayTouchscreen 7.5 inch TFT color LCD panel, 640 x 480 (VGA)
CommunicationEthernet; RJ-45 connector, Communication speed; 100 Mbps
Protection degree
of enclosure
IP65, NEMA Type 4X
Weight4 kg
MountingAnalyzer mount (Front, left-side, right-side) with tilt function, Pipe mount or Panel mount
Cable Entries1/2NPT or M20 x 2
Ambient operating temperature; -20 to 55℃
Storage temperature: -30 to 70℃
Humidity: 10 to 90%RH at 40℃ (Noncondensing)
Power Supply24 V DC ±10%
Hazardous area
Division 2, Zone2: Non-Incendive/Type n; FM, cFM, ATEX, IECEx

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