Moisture in Natural Gas Analyzer
The next generation TDLAS Analyzer for automatic online measurement of moisture in variable compositions of natural gas and biomethane. The OptiPEAK TDL600 Tuneable Diode Laser Analyzer employs the latest techniques in laser absorption spectroscopy and signal processing power to offer a robust high performance analyzer, designed specifically for the measurement of moisture in natural gas. This non-contact technology requires minimal maintenance, even in demanding applications such as changing methane concentrations or sour gas. The analyzer is fully hazardous area certified and delivers class-leading measurement performance, stability and detection sensitivity.

Product Features

  • D-MET system: Factory-ready for varying gas compositions. For example, after stream blending or injection of shale gas or biomethane to a network.
  • Operating range down to 1 ppmV
  • Sour gas compatible
  • Simple installation and setup
  • Lowest maintenance
  • IECEx, ATEX and cQPSus certified for EExd flameproof
  • Integrated sample handling
  • Proven Michell Instruments quality: 40 years of expertize in moisture measurement built into the design
Optipeak TDL600

Technical Specification

Measuring Technique TDLAS
Measurement range 1 ppmV to 1000ppmV
Accuracy ±1% of reading > 100ppmV
±1ppmV < 100ppmV
Repeatability <1ppmV (long term stability <0.1ppmV/year)
Limit of detection 1ppmV
Available units ppmV, lb/MMSCF, mg/Nm3, dew point °C or °F (ISO18453 or IGT#8)
Response speed Optical response 0.2s
Display update 2-3s
Environmental conditions Indoor version: +10°C to +45°C
Outdoor version:* –20°C to +45°C
Outdoor with cooling option:* –20°C to +55°C
Electrical Specifications
Supply voltage 110 V AC or 230 V AC 50/60Hz
Power requirements Indoor version: 80W
Outdoor version: 180W
Analog signals Input: 2 x 4-20 mA user configurable
Output: 3 x 4-20 mA,3 alarms 250 V AC, 3A (volt-free contacts)
Digital communications RS485 ModBus RTU
Data logging Logs all process variables with a user selectable sample period in the range 10s to 1 day
Local interface 4.3” color LCD with touch pad operation
Electrical connections 3 x M20 entries for cable glands
Factory method 3-point, traceable to NPL and NIST
Recommended calibration None required, dependant on user or quality system requirements
Physical Specifications
Sample flow rate 1 Nl/min cell sample, 1 to 5 Nl/min sample filter by-pass
Inlet pressure Maximum 100 barg (1450 psig)
Outlet pressure Cell vent 0.7 to 1.4 bara, Filter by-pass maximum 3 barg
Enclosure type/ packaging Aluminium alloy, explosion proof, polyester coated, IP66, NEMA4
Gas connections 1/4” NPT(F)
Weight 40kg (88lbs) (without sampling system)
Sample system enclosure 304L or 316L stainless steel
Hazardous area certification ATEX: II 2 G Ex d ib op is IIC T5 Gb
IECEx: Ex d ib op is IIC T5 Gb
           Tamb –20°C to +60°C
cQPSus: Class I, Division 1, Groups A, B, C, D, T5,
              Tamb –20°C to +60°C, IP66
TC TR Ex: 1 Ex d ib op is IIC T5 Gb
*If installed outside, the analyzer must be shaded from direct sunlight to prevent heating effects through sun radiation

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