Measurement and testing
Published over 15 years ago. See the latest and most current information on Measurement and testing.
The Hilase is a reliable and virtually maintenance free Process Analyser for the measurement of H2S, H2O, CO2, CH4, C2H6, Methanol/Ethanol, COS, Ammonia, etc in a range from low ppm to high % levels.
Reliable H2S, H2O and CO2 measurements are critical in many industries to control gas treatment, protect process equipment and pipelines and supply a good quality gas to your customers.
The Hilase is a big step forward as it offers a combination of features not available with any other technology. No moving parts, no costly
parts subject to wear, full separation of photo acoustic measuring cell and electronics, heated cell option, fast 20 seconds response time, stable calibration, more then 90% self diagnostics, robust design, easy installation, a 6 months maintenance interval, ATEX zone 1 certification and >99,8% availability.
In contaminated gas streams the photo acoustic cell is far less sensitive to fouling than an optical detection method.
Technology
The analysis is based on photo acoustic technology, whereby the different compounds are excited by Tuneable Diode Laser (TDL) and detected by a microphone. The TDL wavelength is tuned to the absorption line of the measured component and its background. This technology utilizes all the benefits of high resolution and thus very specific, virtually interference free excitation of TDL, combined with a robust photo acoustic detection principle.
By modulating the laser with a frequency equal to the resonance frequency of the acoustic cell, a sound signal is generated. This sound signal is measured by a sensitive microphone and provides a linear response over a wide concentration range.
As the Hilase does not use optical detection, the analysis is insensitive to contamination or fouling.
The 6 months maintenance interval in combination with 1,5 hour warm-up time the analyzer provides a high availability. The >90% self diagnostics results in improved reliability.
Multiple photo acoustic cells and/or dual lasers in a single analyser allow simultaneous analysis of different components (e.g. H2S; H2O; CO2; CH4 etc.) and multi-stream monitoring (e.g. before and after separators).
Operation, service and maintenance
This robust analyser is suitable for outdoor installation in a harsh industrial environment where minimal maintenance and minimal operator interventions are required.
The stable calibration factors require only a single point calibration verification every 6-12 months. The analyser does not have moving parts nor require consumables.
Typical Hilase applications
Where you need to protect your and your customer’s installation against H2O, H2S, CO2, etc you can rely on the Hilase in combination with Hobré Instruments’ proven sampling system designs.
PIN 27.2 Apr/May 2026
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