BTEX Analyzer Using ChromaPID PID Sensor

Technical Specifications and Configuration

Sampling and Injection System

• Uses a gate valve combined with a loop for automatic sample collection.
• Injects the sample through the loop directly into the metal capillary chromatography column (internal diameter 0.53 mm).

Chromatography Column and Oven

• Employs a metal capillary chromatography column to ensure stable analysis.
• Features a standard isothermal oven (with an optional programmable temperature gradient) with pressure and carrier gas flow control via valves.

Detection System

• Equipped with a photoionization detector (PID) sensor with a standard 10.6 eV lamp; alternative lamps can be substituted upon request.
• The self-cleaning lamp function maintains high performance and stability during operation.

Communication and Data Output

• Provides a 0–1 V analog output for setting alert thresholds (for low or high concentration warnings).
• Supports two-way RS-232 communication for transmitting data and analysis results to a computer.

Software and Data Storage

• The VISTACHROM Chromatotec® software enables data viewing, storage, processing, and export on a PC.
• Supports calculations of retention time, area, mass, or concentration profiles according to international measurement units.
• Data can be continuously stored for over 10 years with timestamped results.

Operating Principle

• Sampling and Injection:
  The system automatically collects samples via a loop and injects them into the metal capillary chromatography column.

• Gas Chromatographic Analysis:
  The device operates in an isothermal mode, separating compounds on the column.

• PID Detection:
  Compounds exiting the column are detected by the PID sensor (10.6 eV lamp), with a self-cleaning lamp feature that maintains measurement stability.

• Result Verification:
  The system automatically injects a standard to verify and calibrate the measurement results.

Measurement Range

Different configuration versions are available depending on the concentration range:

• ppb Version: For a range of 0–1 ppm.
• ppm Version: For ranges of 0–10, 0–50, or 0–100 ppm.

Analytes

• Benzene (with a TWA of 1 ppm)
• Iso Alcohol Amines
• BTEX, Styrene, Cyclohexane
• 1,3-Butadiene, Iso-Propyl-Benzene (Cumene)
• Epichlorohydrin

Key Advantages

• Continuous Monitoring:
  Online automatic sampling ensures reliable and continuous data acquisition.

• High Analytical Performance:
  Demonstrates high specificity, linearity, and sensitivity toward VOC compounds.

• Low Gas Consumption:
  Gas usage is minimal and can be further reduced with upgrade options.

• No Need for Compressed Air Cylinders:
  Utilizes an internal tube calibration system and gas generator.

• Integrated Automatic Control:
  Features adjustable and interactive alarm levels.

• Full Traceability:
  Offers result storage and direct chromatogram display on the board.

• Versatile Data Output:
  Supports data export via MODBUS protocol and analog outputs (4–20 mA or 0–10 V) with timestamping for each result.

Upgrade Options and Special Versions

• Wall-Mounted Cabinet:
  Includes a touchscreen and supports MODBUS RTU or TCP/IP communication protocols.

• Analog Output Module:
  Provides 4 channels of analog output (4–20 mA or 0–10 V).

• 24 V Power Supply:
  Designed for mobile devices.

• Multi-Channel Sample Flow Selector:
  Available in configurations from 2 to 10 channels.

• Nitrogen Gas Generator:
  (nitroxychrom, model XXX913CS).

• Calibration System:
  Utilizes a benzene diffusion tube.

• Explosion-Proof Version (Exp):
  Complies with ATEX, IECEx, Zones 1 and 2, as well as CSA C1D2 standards; equipped with an internal heating/cooling system and insulation for the protective cabinet.

• Liquid Sampling System:
  Features a venting function to separate sulfur from the liquid phase (model XXPurge ED Ex).

• GC Oven with Temperature Gradient Capability:
  Serves the analysis of multi-component mixtures.