Overview

The Fixed Gas Sampling System (FGSS - GSS-200) is designed for continuous monitoring of hazardous gas concentrations in shipboard environments. This system features dual pumps for redundancy, real-time gas detection, and automatic safety shutdown mechanisms to prevent gas accumulation.

1. Safety Information (p.6-8)

• Electrical Hazard: Ensure power isolation before installation or maintenance.
• Anti-Static Precautions: Handle PCBs with proper grounding.
• Storage Conditions: Store in dry areas, away from moisture and extreme temperatures.

2. System Components (p.12-16)

2.1 Analyzing Unit (PCB)

• Converts gas concentration readings into digital signals.
• Provides RS-485 communication with display and external monitoring systems.
• Alarm Relays: Supports 2-level gas alarms (pre-alarm and main alarm).

2.2 Display Unit (Control Unit)

• 12.1-inch touchscreen LCD for real-time system monitoring.
• Displays gas concentration levels, alarm status, and diagnostic messages.

2.3 Gas Detectors

• Detects CH4, O2, CO2, H2S, and other gases.
• Signal Output: 4-20mA.
• Response Time: <30 seconds.

2.4 Solenoid Valves

• DC 24V 2-way and 3-way valves for gas sampling.
• Controls gas flow to sampling channels.

2.5 Flow Meter

• Measures airflow rate in the sampling line.

3. System Operation (p.17-24)

3.1 Startup Procedure

1. Verify all gas sampling channels are open.
2. Power on the display unit (HGS-200CS).
3. System enters initialization mode for sensor stabilization (120 sec).
4. Begins sampling sequence and displays gas concentration levels.

3.2 Alarm & Fault Indications

4. Configuration & Calibration (p.27-42)

4.1 System Settings

• Alarm thresholds, sensor configurations, and sampling time intervals.
• Password protection for critical settings.

4.2 Gas Detector Calibration

• Zero Calibration: Adjusts baseline at 4mA signal.
• Span Calibration: Sets 100% scale at 20mA using calibration gas.

4.3 Flow Calibration (Pressure Transmitter)

• Adjusts airflow measurements to ensure accuracy.
• Verifies pressure transmitter output for correct sampling flow.

5. Troubleshooting & Maintenance (p.53-56)

6. Storage & Handling (p.8)

• Store components in dry, static-free environments.
• Ensure gas detectors are properly sealed before installation.
• Inspect all parts before deployment.

7. Related Documents (p.65)

• Honeywell Sensepoint XCD Gas Detector Manual
• Teledyne GD10P Gas Detector Manual
• HANLA IMS GDS-200 Manual