Gas analyzer 700 LX HFID

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Overview
The ENVEA 700 LX HFID Analyzer continuously measures total hydrocarbon concentrations in gaseous samples using heated flame ionization detection (FID) with a 191°C oven designed for continuous process and emissions monitoring.

Operating principle
The analyzer contains a heated oven (191°C) housing a burner and an optional heated sample pump. A stable flame is sustained by regulated flows of air and hydrogen or H2/He or N2 mixtures. Sample gas ionizes in the flame; a split-ring FID with two electrodes and a high-impedance, low-noise electrometer amplifier measures the ion current proportional to hydrocarbon concentration.

Features and benefits

• Measurement ranges: 30 ppm to 30,000 ppm (methane scale) or 0–10 to 10,000 ppm (propane scale)
• Automatic calibration and auto-ranging
• Fast response: 90% Full Scale in ~3 s
• Electronic flow control and temperature-stabilized detector
• Automatic fuel/air shutdown and comprehensive diagnostics
• Standard outputs: voltage, current, RS-232 AK protocol, TCP/IP MODBUS

Options

• Internal heated sample pump
• Internal calibration module
• Solenoid valves

Main applications

• Combustion efficiency monitoring
• Process gas analysis
• Fuel cell testing
• Turbine and generator feedback control
• Personnel safety monitoring
• Vehicle and engine emissions

Technical Information
Detector: Flame Ionization Detection (FID)
Response time: 90% Full Scale in 3 seconds
Ranges: Four user-definable ranges from 0–30 to 30,000 ppm (CH4) or 0–10 to 10,000 ppm (C3H8)
Detection limit / Resolution: 10 ppb carbon
Repeatability: Better than 0.5% FS
Linearity: Better than 1% FS
Accuracy: Better than 1% FS
Noise: Less than 1% FS
Zero & span drift: Less than 1% FS per 24 hours
Sample flow rate: Typically 1.5–2.5 LPM
Air requirements: Purified air <1 ppm C or synthetic air (300 cc/min for H2/He; 400 cc/min for H2)
Power: 115/230 VAC ±10%, 50/60 Hz, 750 W max
Display: 3" x 5" LED LCD
Dimensions & weight: 5¼ H x 19 W x 23 D (inches) / 50 lbs.

Characteristics / Specifications

• Model: 700 LX HFID
• Detection principle: Flame Ionization Detection (FID)
• Oven temperature: 191°C
• Ranges: User-definable up to 30,000 ppm
• Detection limit: 10 ppb carbon
• Response time: 3 s (90% FS)
• Outputs: Voltage, current, RS-232 AK, TCP/IP MODBUS
• Sample flow: ~1.5–2.5 LPM
• Power: 115/230 VAC ±10%, 50/60 Hz, 750 W max