Dalian Yunde Shipbuilding – Online Gas Concentration Analysis
Project Requirement:
VOC (Volatile Organic Compounds) content detection
Applicable Standards and Regulations:
Applicable Standards and Regulations:
NFPA No.70 – National Electrical Code
IEC 60529 – Degrees of Protection Provided by Enclosures (IP Code)
IEC 60364 – Electrical Installations of Buildings (Safety Distances)
HG/T 20502-2000 – Letter Codes and Graphic Symbols for Process Measurement and Control Systems
HG/T 20516-2000 – Design Specification for Analyzer Houses
HG/T 20513-2000 – Design Specification for Instrument System Grounding
HG/T 20511-2000 – Design Specification for Instrument Alarm and Safety Interlock Systems
GB 50131-2007 – Construction and Acceptance Specifications for Industrial Automation Instrumentation Projects
GB 3836-2000 – Electrical Equipment for Explosive Gas Atmospheres
GB 50093-2002 – Construction and Acceptance Specifications for Automation Instrumentation Projects
EEMUA No.138 – Design and Installation of On-Line Analyzer Systems
IEC 60079 – Electrical Equipment for Explosive Gas Atmospheres
EN 61326 – EMC Compliance Standard for Electrical Equipment
EN 61010-1 – Electrical Safety Compliance Standard
EN 60529 – Protection Class Compliance Standard
ISA S5.1 – Instrument Symbols and Identification
GB 12519-90 – General Technical Requirements for Analytical Instruments
GB 11606.1–17-89 – Environmental Test Methods for Analytical Instruments
Supporting Products:
SH Series Gas Monitor (PID Type)
The SH Series Gas Monitor integrates our company’s extensive experience and strong innovation capabilities. Its advanced technology ensures longer service life, high sensitivity, fast response time, and excellent anti-poisoning performance. Main technical specifications:
Detection Principle: Optical
Measurement Range: 0–2000 mg/m³
Accuracy: ≤ ±3% F.S.
Repeatability: ≤ ±3% F.S.
Enclosure Material: Cast aluminum
Power Supply: 24VDC (range: 12VDC–28VDC)
Display: High-brightness LED
Signal Output: (4–20) mA linear
Online Monitoring System for Volatile Organic Compounds (VOCs) – Technical Specifications:
Power Input: 220V AC
Operating Power Consumption: 35–40W
Sensor Type: PID
Target Gas: VOCs
Sampling Method: Pump suction
Detection Range: VOCs: 0–2000 mg/m³
Accuracy: ≤ ±3% F.S.
Resolution: 1 mg/m³
Repeatability: ≤ ±3% F.S.
Zero Drift: ≤ ±3% F.S. per 24h
Span Drift: ≤ ±3% F.S. per 24h
Response Time (T90): ≤ 30 seconds
Communication: 4–20 mA
Alarm Mode: Audible and visual alarm
Operating Temperature: -20°C to 60°C
Operating Humidity: 0–90% RH (non-condensing)
Supplementary Technical Solution
System Architecture Overview
The VOCs online monitoring system consists of the following core components:
Gas sampling unit (pump suction type)
SH Series PID gas detector
Data processing and transmission module
Control unit (PLC or DCS compatible)
Signal output interface (4–20mA)
Audible and visual alarm devices
Monitoring software platform (optional for centralized display, storage, and trend analysis)
All components are modularized for easy integration into existing control rooms or analyzer cabinets.
Functional Features
Real-time Monitoring
Continuously tracks VOC concentration levels in critical zones, ensuring 24/7 data acquisition and alarm readiness.
High Sensitivity & Fast Response
PID sensor enables rapid response (T90 ≤ 30s) with detection down to mg/m³ level.
Alarm System Integration
When gas concentration exceeds threshold, the system triggers audible and visual alarms while simultaneously outputting a signal to central control systems.
Data Output & Remote Transmission
Supports analog signal (4–20 mA) and optional digital protocols (RS485, MODBUS) for seamless integration into SCADA/DCS systems.
Zero/Span Drift Compensation
Built-in compensation logic ensures long-term stability in harsh marine environments.
Installation and Deployment
Sampling Point Design
Based on ship structure and ventilation flow, sampling points are strategically placed near VOC emission sources such as paint rooms, fuel storage, and mechanical compartments.
Enclosure Protection
Equipment enclosures comply with IEC 60529 IP65/IP66 ratings, suitable for marine corrosion and vibration-prone environments.
Explosion Protection
Detectors comply with IEC 60079 / GB 3836 standards, suitable for explosive gas atmospheres (Zone 1 & Zone 2).
Operation and Maintenance
Automatic Calibration Reminder
The system supports scheduled calibration with prompts for zero and span checks.
Easy Maintenance Design
Sensor modules and filters are replaceable in the field without dismantling the entire device.
System Diagnostics
Built-in diagnostics for power supply, sensor fault, communication failure, and drift warnings.
