MKS Precisive - Model 5 -Hydrocarbon Composition Analyzer
Precisive 5 gas analyzers require no carrier-gases, no-calibration gases and offer fast response analytics without compromising accuracy, repeatability, linearity or stability in the presence of interference. Precisive 5`s faster-response multi-component analysis provides significant cost-savings and efficiency gains in power generation applications.
Using a unique wavelength-sweeping tunable filter spectrometer, fast update rates down to sub-second intervals are performed for the full C1 through C5 analysis. Sampling is a flow-through type, suitable for a continuous, on-line, unattended operation. This analyzer does not require carrier gas, fuel gases, or on-site calibration gases. The standard system configuration provides measurements of up to 100% methane, 25% of ethane, 25% of propane, 10% of butanes and 5% of pentanes. Other ranges and/or additional gases are available (contact Precisive for specific requirements, compounds and ranges).
- Fast response for real-time control & optimization
- C1 - C5 alkane separation, CO2, & calorific value
- Flow-through analysis without the need for carrier-gas
- Remote, unattended continuous operation
- Eliminates carrier gases and other consumables
- Eliminates calibration gases and fuel gases
- Virtually zero cross-sensitivity, high sensitivity & linearity
•Fuel analysis for engine control (gas turbines, internal combustion engines, fuel cell power plants, etc.)
•Methane number monitoring for internal combustion engine control
•Wobbe Index metering for combustion control applications
•Check metering, blend monitoring, and BTU monitoring•Custody transfer and fiscal metering
•Biomethane injection control
•Acid/sour gas, syngas composition, and Flare BTU monitoring
•Natural gas fractionation/liquefaction
•Ethylene production
Precisive's hydrocarbon analyzer, based on Tunable Filter Spectroscopy (TFSTM), is specified to have a “permanent” lifetime span calibration under normal or specified operating conditions. However, the customer may periodically validate the span accuracy as well as modify the span factors as desired or required.
The analyzer is specified to have less than 0.2% of full scale of baseline drift per month. The customer can easily perform re-zeroing of the analyzer by purging it with clean air or nitrogen and sending a “zero” command through the software interface. Re-zeroing can be done automatically by using solenoids for stream switching.
Factors Resulting in Permanent Span Stability (i.e. no requirement for recalibration)
- Precisive’s TFS technology is non-contact in nature, therefore there is no sensor “poisoning” that could affect span stability or sensor responsivity.
- Unlike “relative” sensing technologies such as gas chromatography, the Precisive Analzyer is based on direct, “first-principle” measurement. It is based on light absorption spectroscopy where signal corresponds directly to the amount of gas molecules in the sample cell. Refer to Note A below.
- Precisive Analyzers compensate for gas pressure variations in real-time and controls the gas temperature, the only two parameters that could affect span stability (see Note B)
- Precisive’s spectroscopic engine captures the true sample spectrum containing the “peaks and valleys” every scan, enabling measurement accuracy that is insensitive to light source drift, detector drift and other electronic drift.
Precisive Gas Analyzers are designed to be robust and accurate, requiring low maintenance. Span recalibration is a time-consuming and expensive procedure requiring high-quality certified calibration cylinders and their required infrastructure and maintenance. The Precisive Analyzer eliminates the need for span recalibration through its inherent first-principle methodology and instrumentation design that systematically manages sample uncertainties and variations.
Precisive Analyzers are calibrated at the factory using NIST traceable gas mixtures with gravimetric validation. The factory calibration maintains its accuracy throughout the life of the Precisive Analyzer.
The customer is free to perform re-spanning or “recalibration” as they see fit as per their process. They may use their own trusted certified mixture(s) and perform the re-spanning as often as their process calls.
Many of our customers do not like to validate our first-principles direct-measurement technology by comparing with a GC. The GC itself may be inaccurate or inconsistent given it is a relative method to the calibration itself. The most common approach is to use high-quality certified mixtures, much like what Precisive uses at the factory to calibrate the analyzer in the first place.