Xact - Model 640 - Multi-Metals Continuous Emissions Monitoring System (CEMS)
From Elemental and Metals Measurement
The Xact 640 system uses reel-to-reel filter tape sampling and nondestructive X-ray fluorescence (XRF) analysis to monitor stack hazardous air pollutant (HAP) metal emissions. An isokinetic sub-sample of stack gas goes into the stilling chamber and then drawn through a chemically reactive filter tape. Vapor phase metals, including mercury, are deposited along with particulate-phase metals on the filter tape.
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Product Details
The deposit is automatically advanced and analyzed by XRF for selected metals as the next sample is being collected. Sampling and analysis are performed continuously and simultaneously, except during advancement of the tape (~20 sec) and during daily-automated quality assurance checks.
In 2007, through its Clean Air Excellence Award, the EPA recognized the Xact 640 CEMS as an outstanding achievement in innovative clean air technology. The EPA also approved the Xact 640 CEMS as an alternative method for periodic Method 29 testing and feed stream analysis, as well as for monitoring emissions during plant operation.
Features:
- Automatic quality assurance, alarms and control features
- Gas phase calibration not required
- Identification and measurement of 23 elements simultaneously (refer to the periodic table on the 640 Spec Sheet below)
- Internal calibration check incorporated with every sample analyzed
- Proven RTR XRF technology demonstrated on the ocean floor, Mars, and in thousands of beta attenuation monitors
- Daily automatic upscale, blank, and flow checks
- Recognized by the EPA as an innovative clean air technology (Clean Air Excellence Award, 2007)
- Sampling, analysis, and near-real-time reporting (every 15, 30, 60 and 120 minutes)
Benefits
- Single monitor platform for Hg and Hazardous Air Pollutant metals compliance
- No PM monitor needed to comply with Mercury and Air Toxics Standards
- May be used to meet 40 CFR Part 60 and 63 regulations
- Measures total mercury in µg/dscm
- Saves expenses, time, and resources as compared to Method 29
- Non-destructive analysis allows for sample archiving
- Sensitive and reliable (ng/m3 to µg/m3 range)
Applications
The Xact 640 monitoring system can simultaneously identify and measure multiple metals in flue gas to provide data for use in the following applications.
- Hg CEMS
- HAP metals CEMS
- Baselining a new process
- Optimization of emission controls
- Permitting
- Regulatory compliance
- Risk management
Specifications
- Measurement method: Based on EPA Method IO 3.3: Determination of Metals in Ambient PM Using XRF
- Key applicable elements: Sb, As, Ba, Cd, Cr, Co, Cu, Fe, Pb, Hg, Mn, Ni, Se, Ag, Sn, Tl, V, Zn, and more available
- Measurement range: Demonstrated up to 1963 μg/dscm
- Detection limits (IF, EPA IO 3.3): Metal and sample time dependent; refer to the minimum detection limit (MDL) data
- Sampling and analysis times: Every 15, 30, 60, 120 minutes, depending on the per sample mass
- Calibration stability check frequency: Automatically with each sample analyzed
- Estimated recalibration frequency: Annually, when manufacturer’s operating recommendations are followed
- Sample flow rate: 1.051pm
- Linearity: Correlation coefficient >0.98
- Required operating environment: Lab environment with temperature controlled to 20±3°C (68°F)
- Power requirements:
- 120 VAC/60 Hz @ 2-20 amp circuits
- 220 VAC/60 Hz 20 amp with an optional power converter
- Outputs:
- Modbus ASCII protocol
- All metals that the system is calibrated to measure will be reported
- Options:
- Change or add elements
- Enclosures
- Remote control
- Remote polling
Elements Supported
Xact 640 monitoring systems identify and measure the 63 elements highlighted in the table below. Minimum detection limits (MDLs) for the elements highlighted in blue can be found on the Performance page of this data sheet. The system is capable of measuring the elements highlighted in dark gray, but MDLs have not been developed.
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