Application:

• Measurement of C1-C5 and carbon dioxide for oil & gas exploration

Analyzer

The PetroAlert Model 8900 combines the selectivity of gas chromatography with the sensitivity, broad dynamic range, and hydrocarbon selectivity of a thermal conductivity detector (TCD) providing fast analysis of C1-C5 hydrocarbons and Carbon Dioxide required in Mud Logging for Oil & Gas exploration.

The PetroAlert Model 8900 uses a dual column configuration with timed backflush to vent which is used to strip off moisture and C6+ hydrocarbons. A pre-cut column is used in series with the analytical column. At sample injection a fixed sample volume is carried to the pre-cut column. Backflush of the pre-cut column is timed from sample injection so that only C1-C5 hydrocarbons are eluted from the pre-cut column to the analytical column. C6+ hydrocarbons on the pre-cut column are then vented. Then a third column is used in conjunction with a second 10-port valve for individual analysis of methane. C1-C5 hydrocarbons are separated on the analytical column and elute to the thermal conductivity detector (TCD) for analysis.

Features

• Analysis of C1-C5 Hydrocarbons and Carbon Dioxide for Gas Referencing
• Automatic baseline adjustment for long-term stability
• Automatic calibration to a known standard
• Analog output ranges are user selectable
• Multipoint sampling options
• RS-232 and optional LAN

Specifications

Analysis Time: <300 seconds through Propane, <800 seconds through Pentane
Detector: TCD
Column: Packed
Oven Temperature: 80 °C, Nominal Nitrogen, 30cc/min, Nominal
Lower Detection Limit: <50ppm
Accuracy: ±5% (relative) within dynamic range.
Precision: 2% of Measured Value
Span Drift (24HR): <2% of Full-scale
Sample Flow Rate: 250-500cc/min, typical

Output:

Analog: (1) 0-20ma or 4-20ma loop power supplied, isolated. Selectable for: gas concentration, unintegrated detector signal. Options for up to 20 additional programmable 0-20ma, 4-20ma or voltage outputs: 0-1V, 0-5V, or 0-10V.
Digital: RS-232, optional Local Area Network
Relays: (5) User programmable relays for concentration and diagnostic alarms (1A @ 30Vdc). Options for up to 32 additional relays available.
Inputs: Optional digital input board for 3 contact closure inputs. Supports start analysis, start calibration, and analyze calibration gas sample.