Xact - Model 920 - Multi-Metals Continuous Water Analyzer
From Elemental and Metals Measurement
The Xact® 920 system is the latest application of SCI’s automated XRF module that allows for the analysis of continuously-drawn aqueous samples for user-selected metals. A measured amount of unknown sample is blended with a known amount of internal standard which is continuously nebulized, evaporated, and collected onto the filter tape. The liquid sample is aerosolized facilitating the removal of water and allowed metal salts to be concentrated on the filter tape. This method of pre-concentration allows detection limits in the low parts per billion (ppb) ranges for elements ranging from potassium to uranium.
Product Details
The concentrated deposit is automatically advanced and analyzed by XRF for selected metals as the subsequent sample is collected. Sampling and analysis are performed continuously and simultaneously, except during the advancement of the tape (~20 sec) and during daily-automated quality assurance checks.
Features
- Sampling, analysis and near real-time reporting (every 15, 30, 60, 120, 180 or 240 minutes in ppb or ng/g)
- Windows-based operating system with 10.1-inch touchscreen
- Identification and measurement of 65 elements simultaneously
- Automatic quality assurance, alarms, and control features
- Incorporates an internal EDXRF quality assurance standard with every sample
- Provides automatic, daily EDXRF calibration drift checks
- Remote polling and system control
- Global power design does not require power conversion
Benefits
- Highly sensitive and reliable (low ppb to high ppm)
- Large measurement range (greater than 5 orders of magnitude) with single calibration
- Nondestructive analysis for sample archiving
- Low maintenance cost
- Extremely stable, requiring only automated calibration checks
- Analytical recalibration frequency generally less than once per year
Applications
The Xact® 920 monitoring system can simultaneously identify and measure multiple elements in liquid samples providing near real-time data for the following applications:
- Wastewater and water treatment plants
- Industrial and mining influent and effluent
- Treatment system optimization evaluation
- Drinking water
- Food and beverage industry
- Surface water
- Groundwater
- RO Membrane integrity
- FGD water treatment
- Ash pond remediation
Specifications
Measurement method: Based on EPA Method IO 33: Determination of Metals in Ambient PM Using XRF
- Key applicable elements: Sb, As, Ba, Cd, Ca Cr, Co, Cu, Fe, Pb, Mn, Ni, Se, Ag, Sn, Ti, Tl, V, Zn, and more available
- Measurement range: 1,000ppm of any analyte
- Detection limits: Depends on specific metal, sampling times, interfering metals, and level of dissolved solids See datasheet performance section
- Sampling and analysis times: Every 15, 30, 60, or 120, 180, or 240 minutes, user defined.
- Calibration stability check frequency: Automatically with each sample analyzed
- Estimated recalibration frequency: Annually, when manufacturer’s operating recommendations are followed
- Sample flow rate: Application specific
- Linearity: Correlation coefficient >0.98
- Size and weight:
- 60” (W) x 38” (D) x 80” (H), 900 lbs.
- NEMA 4x temperature controlled enclosure
- Power requirements:
- Qty 2, 120 VAC/60 Hz @ 15 amp circuits
- 220 VAC/60 Hz 15 amp
- Outputs:
- RS232 Modbus signal
- Selected analytes plus quality control parameters are reported
- Options:
- Change or add elements
- Multiplex stream switching manifold
Elements Supported
Xact 920 water monitoring systems are capable of identifying and measuring the 65 elements highlighted in the table above. The Xact 920 can measure elements highlighted in gray, but quantification depends significantly on solution matrix. Please contact your Xact representative for more information on your specific metals monitoring requirements.
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