How it works
The Synspec GC 966 series 611/811 uses a combination of two gas analysers for online continuous monitoring of ozone precursors in ambient air. The combination of the two can measure up to 80 components.
For hydrocarbons with higher boiling points (BP range > 50 oC ), a trap with a low memory effect and a column, suitable for separating species present in this BP range, are used. For the low boiling hydrocarbons, a cooled trap and a column that is dedicated to separate the low boiling hydrocarbons, are used.
The GC 955 811 is specifically designed for the measurement of hydrocarbons from C2 up to C5, predominantly emitted by the petrochemical industry either through refineries, evaporation during transport or incomplete combustion. These compounds, including propane, butane, ethene, and isporene, have diverse applications from industrial processes to household cooking. However, they do pose health risks and serve as significant ozone precursors (which is the main reason for monitoring).
The GC 955 811 is a gas chromatograph with a built-in cooled pre-concentration system and uses both photo ionization and flame ionisation detectors for high sensitivity and precise analysis. Hydrocarbons are concentrated on cooled trap inside the system, unsaturated hydrocarbons are detected by PID and unsaturated by FID, making identification simple. Operating with a detection limit of <0.1ppb up to concentrations exceeding 30 ppb, this analyser offer flexibility with adjustable measurement cycles. . Sample humidity must be controlled preferably by using the Synspec SCU sample conditioning unit
The GC 955 611 measures hydrocarbons from C6 up to C12, primarily sourced from fossil fuels with benzene being the sole carcinogenic compound in its monitored list. The 611 has similar functionality to its 811 counterpart, using photoionisation detection for high sensitivity with optional flame ionisation detection as a second detector.
Both analysers include robust features such as customisable measurement cycles, integrated pre-concentration systems, and compatibility with Windows Embedded PCs for seamless data management. They offer various output options for data transfer and communication with other systems.
Maintenance requirements are minimal, with recommended annual preventive maintenance and automatic calibration/validation features for ensuring data accuracy.
Servicing
Datasheet
GC955 611811 Ozone Precursor Analyser
Synspec GC955 611 ozone precursor analyser – high boiling hydrocarbon fraction
Technical description
PID and optionally FID detector. Lowest detection level for benzene <0.4 µg/m3 (0.15 vppb). Please contact us for the lowest detection levels for the other components. Standard range: 0-30 ppb ( can be extended upon request).
Reproducibility
Typical <3% at 1 ppb (benzene, with capillary column)
Gas connections
Instrument air: dry and clean, 3 bar, 250 ml/min (when optional FID is installed) Nitrogen, quality 5.0, 4 bar, 25 ml/min Hydrogen, quality 5.0, 3 bar, 20 ml/min
Synspec GC955 series 811 ozone precursor analyser Low boiling hydrocarbon fraction
Technical description
PID and FID detector. Lowest detection level for 1-butene <0.4 µg/m3 Please contact us for the lowest detection levels for the other components.
Standard range: 0-30 ppb ( can be extended upon request).
Reproducibility
Typical <3% at 1 ppb (butane), with capillary column)
Gas connections
Instrument air: dry and clean, 3 bar, 2 x 250 ml/min ( for FID and permapure dryers)
Nitrogen, quality 5.0, 4 bar, 25 ml/min
Hydrogen, quality 5.0, 3 bar, 20 ml/min
Certificates
CE approval for EMC conformity: EN 61000-6-2, EN 61000-6-3, EN 61010, EN 61326
Standard calibration
Standard calibration provided for ozone precursors, UK NPL primary ozone precursor standard at 4 or 5 ppb as the USA Spectra Gases PAMS standard in the range 5-20 ppb.
Dimensions
19” rack, 5 standard Height Units, depth 43 cm net
(W 48,3 D 43 H 22 CM)
Weight
19 and 21 kg
Hardware
Internal industrial x86 based computer, suitable for measuring and saving data up to 10 years. Hard disk,
full colour touchscreen, various data connection options.
Included software
Windows embedded and GC955 software. Direct control via touchscreen, keyboard or mouse, via remote host (RS232/modem) or Ethernet.
Software for running the analyser and demo version for data evaluation and reprocessing on desktop is included.
Power demand
230 V AC, 400 VA (115 V AC available), 50/60 HZ
Options
Synspec Sample Conditioning Unit (SCU) with internal Perma Pure dryer, humidity sensor and switch between zero, span and sample for both analysers. This item is strongly recommended.
