Fixed gas Dectection Systems- 3500 Series
The Tokaseiki Series 3500 Fixed Type Gas Alarm is a compact, modular gas detection system designed for continuous monitoring of combustible gases, toxic gases, and oxygen concentrations in industrial plants, marine vessels, offshore facilities, and hazardous environments. Featuring a narrow-width design, built-in alarm functions, relay outputs, and easy maintenance, the Series 3500 provides reliable gas monitoring and early warning capabilities for critical safety applications.
Description
The system is available in dedicated configurations for combustible gas, toxic gas, and oxygen monitoring, allowing flexible installation and integration into marine and industrial safety systems.
Specifications
| Parameter | Value |
|---|---|
| Equipment | Fixed Type Gas Alarm |
| Manufacturer | Tokaseiki Co., Ltd. |
| Models | TU-3500, TK-3500, TO-3500 |
| Installation | Fixed Mounting |
| Detection Types | Combustible Gas, Toxic Gas, Oxygen |
| Alarm Indication | Buzzer and Lamp |
| Alarm Output | Relay Contact Output |
| Power Supply | AC100V Standard |
| Optional Power Supply | AC110V / AC220V |
| Applications | Marine, Offshore, Industrial Facilities, Utility Systems |
Technical Specification
| Parameter | TU-3500 | TK-3500 | TO-3500 |
|---|---|---|---|
| Gas Type | Combustible Gas | Toxic Gas | Oxygen |
| Detection Principle | Catalytic Combustion | Electrochemical Cell | Galvanic Cell |
| Measurement Range | 0–100% LEL | Depends on Target Gas | 0–25% O₂ |
| Accuracy | ±5% F.S. | ±5–10% F.S. | ±0.7% O₂ |
| Alarm Set Level | 20% LEL | According to Target Gas | 18% O₂ |
| Alarm Output | 1a or 1b Relay Contact | 1a or 1b Relay Contact | 1a or 1b Relay Contact |
| Power Supply | AC100V Standard | AC100V Standard | AC100V Standard |
| Optional Voltage | AC110V / AC220V | AC110V / AC220V | AC110V / AC220V |
| Dimensions | 39.5(W) × 185(H) × 200(D) mm | ||
| Installation | Panel / Fixed Mounting | Panel / Fixed Mounting | Panel / Fixed Mounting |
Available models
Tu-3500 – combustible gas detector
The TU-3500 continuously monitors combustible gas concentrations using catalytic combustion sensing technology. Designed for hazardous areas, machinery spaces, and industrial process environments, it provides reliable detection of flammable gases before dangerous concentrations are reached. Measurement Range: 0–100% LEL Alarm Level: 20% LEL Detection Principle: Catalytic Combustion
Tk-3500 – toxic gas detector
The TK-3500 utilizes electrochemical sensor technology to continuously monitor toxic gas concentrations. Various sensor options are available depending on the target gas and application requirements.
Typical Detectable Gases:
- Carbon Monoxide (CO)
- Hydrogen Sulfide (H₂S)
- Ammonia (NH₃)
- Sulfur Dioxide (SO₂)
- Chlorine (Cl₂)
- Hydrogen Chloride (HCl)
- Other toxic industrial gases
To-3500 – oxygen monitor
The TO-3500 continuously measures oxygen concentration using a galvanic cell sensor, providing early warning of oxygen deficiency or enrichment conditions in confined and hazardous spaces. Measurement Range: 0–25% O₂ Accuracy: ±0.7% O₂ Alarm Level: 18% O₂
Applications
- Marine Engine Rooms
- Cargo Pump Rooms
- Fuel Handling Areas
- Offshore Platforms
- Chemical Processing Plants
- Petrochemical Facilities
- Gas Utility Stations
- Storage Tank Farms
- Confined Space Monitoring
- Power Generation Facilities
- Industrial Manufacturing Plants
- Hazardous Area Monitoring
Features
- Ultra-compact narrow-width design (39.5 mm)
- Continuous fixed-point gas monitoring
- Available for combustible gas, oxygen, and toxic gas detection
- Built-in buzzer and visual alarm indication
- Relay contact alarm outputs
- Modular installation design
- Easy maintenance and servicing
- Reliable long-term operation
- Suitable for marine and industrial applications
- Fast response and stable monitoring performance
- Supports integration with vessel and plant safety systems
- Durable construction for demanding environments
Benefits
- Provides early warning of hazardous gas conditions
- Enhances personnel and asset safety
- Supports compliance with safety regulations
- Compact design minimizes installation space requirements
- Reliable operation in marine and industrial environments
- Easy integration with alarm and automation systems
- Low maintenance requirements
- Suitable for both new installations and retrofit projects
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