
iv | Model 920 Multi-Gas Analyzer
Maximum Sample Gas Pressure ................................................................................... 2-4
Electrical Requirements.................................................................................................. 2-4
Maximum Start-Up Power ..................................................................................... 2-4
Supply Voltage .......................................................................................................... 2-4
Status Relays .................................................................................................................... 2-4
Sample Gas Flow Rate.................................................................................................... 2-4
Ambient Limits ................................................................................................................ 2-5
Temperature............................................................................................................... 2-5
Humidity.................................................................................................................... 2-5
Maximum Altitude ................................................................................................... 2-5
Sample Transport ............................................................................................................ 2-5
Instrument Air Requirements ....................................................................................... 2-5
Physical Dimensions (on Backpan).............................................................................. 2-5
O2Concentration Signal (Optional)............................................................................. 2-6
Speed of Response.................................................................................................... 2-6
Accuracy..................................................................................................................... 2-6
Repeatability.............................................................................................................. 2-6
24-Hour Zero Drift ................................................................................................... 2-6
Temperature Drift..................................................................................................... 2-6
Electrical Classification ............................................................................................ 2-6
SO2Concentration Signal (Optional) .......................................................................... 2-7
Full-Scale Maximum................................................................................................. 2-7
Cross Interference .................................................................................................... 2-7
Linearity..................................................................................................................... 2-7
Reproducibility ......................................................................................................... 2-7
Temperature Coefficient.......................................................................................... 2-7
Speed of Response.................................................................................................... 2-7
Zero Stability ............................................................................................................. 2-7
NOxConcentration Signals ........................................................................................... 2-8
Full Scale Maximum................................................................................................. 2-8
Cross Interference .................................................................................................... 2-8
Linearity..................................................................................................................... 2-8
Ambient Temperature Coefficient.......................................................................... 2-8
Reproducibility ......................................................................................................... 2-8
Speed of Response.................................................................................................... 2-8
Zero Stability ............................................................................................................. 2-8
Cable Entry Ports, Type 200 Disconnect Enclosure.................................................... 2-9
Approvals and Certifications......................................................................................... 2-9
ATEX and IECEx Certificates and Analyzer Markings..................................... 2-10
Purged Analyzer ATEX and IECEx Certificates and Markings....................... 2-10
Systems with 30 psia Pressure Transducer (Maximum 63 kPag
Sample Gas Pressure) ..................................................................................2-18
Systems with 100 psia Pressure Transducer (Maximum 350 kPag
Sample Gas Pressure) ..................................................................................2-18
Heater Plate ATEX and IECEx Certificates and Marking................................ 2-19
Disconnect Enclosure Type 200 ATEX and IECEx Certificates and Marking . 2-26