Thermox CMFA-P 2000

		CMFA-P2000

The Need
Combustion gas measurements for NOx efficiency and product quality are especially challenging in the glass container manufacturing process. Two types of gas-fired furnaces exist that require post and pre combustion gas analysis. The glass furnace or "melt-tank" is fired by conventional burners that mix pre-heated air and fuel in the burner nozzle. Ambient air leakage in the heat re-cooperation structure can generate thermal NOx in the combustion flames while creating significant thermal energy losses. Flue gas temperature and vaporized glass particulates limit economical excess oxygen analysis to spot sample measurements at opposing-burner checker ports.

Molten glass leaving the glass furnace is transported to container forming equipment through the forehearth furnace. The fore hearth furnace contains several premix burner zones arranged along the length of the furnace walls. Temperature and atmosphere in each combustion zone is controlled by precise air/fuel ratio adjustment of discrete pre-mix gas stations. Ware of leading edge orifices, mixture diaphragms, and play in valve linkages can cause significant variance in air/fuel ratio set points. Periodic sampling and analysis of these discrete premix gas stations is necessary to maintain zone temperature balance for proper glass flow and homogenization as well as zone atmosphere control for color stabilization and curing.

The Solution
The CMFA-P2000, (Combustion Mix Flue Gas Analyzer), was designed specifically to meet the dual furnace combustion requirements of glass container manufacturing plants. Using a highly reactive bare platinum zirconium oxide cell, the analyzer is capable of measuring excess oxygen in post combustion flue gas or excess oxygen to excess fuel in premixed combustion samples feeding forehearth zones. The transportable two piece analysis and control arrangement allows separation so that the readout control can be viewed while making remote adjustments of premix and combustion air valves. An optional air compressor for driving the integral air operated aspirator is available for sampling low flow premix gases, and pulling flue gas samples under draft conditions.

The 2000 Series microprocessor control unit provides a 4 line digital display, analog outputs, alarms, system and sensor diagnostics, software supported calibration.

Specifications
Enclosure:	Both the sensor and control unit are housed in a luggage style, aluminum carrying case
Operating Range:	100% to 0.1% excess oxygen and 0.1% to 50% excess fuel
Display:	Four-line x 20-character vacuum fluorescent display. Displays combinations of excess oxygen, excess fuel, combined excess oxygen to excess fuel, fuels/oxides, oxides to fuels, combustibles, time and date, cell temperature, user programmable text, thermocouple mV, or cell mV. Password protection and context sensitive help are also provided.
Diagnostics:	System test for A/D, RAM, EEPROM and keypad. Display line 4 reserved for full text error and diagnostic messages. Twenty-entry event log.
Analog Output:	Isolated, linear current output, fully scalable. Select excess oxygen, excess fuel, combined excess oxygen to excess fuel range, combustibles, fuels/ oxides, oxides/fuels, cell temperature, thermocouple mV and cell mV. Hold or track during calibration and select degree of damping. Maximum load 1200 ohms.
Calibration:	Calibrate or verify calibration. Store last calibration and verification data.
Built-in Compressor:	Draws gas from up to 6 inches of water vacuum.
Power Requirements:	115 VAC ±10%, 50-60 Hz, 747 VA max.; 230 VAC ±10%, 50-60 Hz, 2222 VA max.
Environment
Ambient Temperature:	Control Section: 14°F to 116°F (-10°C to 47°C)
Sensor Section:	-5°F to 100°F (-20°C to 37.8°C)
Relative Humidity:	10% to 90%, noncondensing
Sample Temperature
Flue Gas Inlet:	0°F to 2000°F (-18°C to 1100°C)
Premix Inlet:	32°F to 122°F (0°C to 50°C)
Accuracy:	± 2% of measured value or ±0.1% O2, whichever is greater. ± 5% of measured value or ±0.25% excess fuel, whichever is greater (specifications based on 0-15% range, natural gas).
Response Time
Percent Oxygen:	63% < 18 seconds; 90% < 22 seconds
Percent Excess Fuel:	63% < 17 seconds; 90% < 63 seconds
Drift:	Less than 0.1% of the cell output per month
Repeatability:	± 0.2% of measured value
Sample / Calibration Gas Flow Rate:	2 SCFH (1 liter/min.)
Maximum Sample Pressure:	10 PSIG (68.95 kPa)
Dimensions:	(H x W x D): 10.75” x 18” x 16” (27.3 cm x 45.7 cm x 40.7 cm)
Weight:	44 lb (19.9 kg)
System Compliance:	EMC Directive: 2004/108/EC Low Voltage Directive: UL 3101-1