Thermox PreMix - Model 2000 - Air/Fuel Ratio Analyzer for Premix Burners

The analyzer is fed a small sample of the air/fuel mixture, burns it, and then measures the net O₂ or net excess fuel content of the mixture.

Designed for permanent installation in pre-combustion applications, the PreMix 2000 is ideal for a range of premix burner processes across the glass and metals and mining industries, including glass forehearths, glass fiberizing lines and open flame brazing.

BYPASS FLOW METER
Most of the sample gas entering the analyzer passes through the bypass flow meter, which ensures a fast response and keeps the sample inlet purged of dead volume. A small portion of the sample flows through the sample flow meter.

AIR/FUEL OPTIMIZATION
The analyzer can handle both oxidizing and reducing premix gases, and provides a continuous measurement of excess O₂ or excess fuel in the process flue gas. This approach ensures the optimum air/fuel ratio before the premix gas reaches the burner.

SERIES 2000 CONTROL UNIT
This field-proven microprocessor control unit provides software-selectable calibration options and extensive analog and digital communications capabilities. It also uses a modular design to facilitate easy upgrades and servicing.

The PreMix 2000 is our permanent installation sensor for air/fuel ratio analysis in premix burners.

• Measures air/fuel ratio in open-flame applications
• Range of measurement and display options
• Operates in excess air or excess fuel conditions
• Calculates calibration gas mix for excess fuel ranges

Sensor

• Range: All or selected portions of the range from 100% to 0.1% excess oxygen and 0.1% to 50% Excess Fuel
• Accuracy: ± 2% of measured value or ±0.1% O2, whichever is greater; ± 5% of measured value or .25% excess fuel, whichever is greater*.
• Repeatability: ± 0.2% of measured value
• Ambient Temperature: -5 to 158ºF (-20 to 70ºC)
• Sample Flow Rate: 0.5 L/min. (1 scfh)
• Bypass Flow Rate: - 50 L/min. max. (106 scfh)
• Max. Sample Pressure: 10 psig
• Power: 115 VAC ± 10%, 50/60 Hz., 1200 VA max.; 230 VAC ± 10%, 50/60 Hz., 2400 VA max.
• Calibration Gas Flow Rate: 10 psig, 2.1 to 4.2 scfh (0.70 kg/cm2, 1.0 to 2.0 L/min.)
• Excess Oxygen Calibration Gases: O2 Span Gas: 20.9% (air) or from 1.0 to 100% O2, balance N2
• O2 Zero Gas: 2% or from 0.1% to 10% O2, balance N2
• Excess Fuel Calibration Gases: CH4 /O2 /N2 Span: 40 to 60% of recorder output span
• CH4 /O2 /N2 Zero: 5 to 10% of recorder output span
• Enclosure: NEMA 3R (IP14)

* Specifications based on 0-15% range, Natural Gas