Flameproof Smart Gas Detector & Transmitter
HSN Code: 90271000
The Chromgate Flameproof Smart Gas Detector & Transmitter is designed for continuous monitoring of oxygen, toxic, combustible and volatile organic compound gases in hazardous industrial environments.
Its hot-swappable smart sensor technology, digital display, configurable alarm outputs and optional RS-485 communication provide reliable gas-leak detection with convenient installation, programming and maintenance.
Key Features
- Suitable for oxygen, toxic, combustible and VOC gas detection
- Electrochemical, catalytic/pellistor, NDIR, PID and solid-state sensor options
- Hot-swappable, smart pluggable sensor module
- Detection units available in PPM, % v/v, % LEL and mg/m³
- Two-line, four-digit LED display
- Eight status-indication LEDs
- Standard configurable 4–20 mA output
- Optional 0–10 V, 0–5 V or 0–1 V output
- Optional isolated RS-485 communication with Modbus RTU protocol
- Two independently configurable alarm setpoints
- Optional STEL and TWA settings for toxic gases and VOCs
- Non-intrusive programming using a magnetic wand
- Password-protected configuration
- On-board alarm acknowledgement
- Sensor-open, over-range, sensor-replacement, calibration-due, calibration-failure and mA-loop-open indications
- Two alarm relays and one fail-safe relay
- Optional PESO-certified hooter-cum-flasher
Technical Specifications
| Parameter | Specification |
|---|---|
| Product type | Fixed Flameproof Smart Gas Detector/Transmitter |
| Detection method | Diffusion |
| Sensor technologies | Electrochemical, Catalytic/Pellistor, NDIR, PID or Solid-State |
| Gases detected | Oxygen, toxic gases, combustible gases and VOCs |
| Display | Two-line, four-digit, 8 mm seven-segment LED display |
| Status indicators | Eight LED indicators |
| Response time | Less than 15 seconds, depending on the selected gas |
| Standard output | Configurable 4–20 mA |
| Current-output accuracy | ±0.125% of full scale |
| Optional voltage output | 0–10 V, 0–5 V or 0–1 V |
| Optional communication | Isolated RS-485 with Modbus RTU |
| Alarm functions | Two configurable alarm levels with latch/non-latch facility |
| Relay outputs | Two alarm relays and one fail-safe relay |
| Supply voltage | 18–36 V DC; typically 24 V DC |
| Power consumption | Less than 3.6 W |
| Cable size | 2.5 mm² flexible or armoured shielded cable |
| Configuration | Magnetic wand without opening the enclosure |
| Operating temperature | -20°C to +60°C |
| Storage temperature | -30°C to +70°C |
| Humidity | Less than 95% RH, non-condensing |
| Protection class | IP66/IP68, depending on configuration |
| Enclosure material | Cast aluminium alloy LM6 |
| Sensor-holder material | SS 316 |
| Cable gland | Double-compression cable gland |
| Cable entry | M20 × 1.5 |
| Mounting options | Wall, stand or pipe mounting |
| Approximate dimensions* | 225 mm H × 270 mm W × 120 mm D |
| Approximate weight* | 2.7 kg |
*Dimensions and weight are stated for the configuration fitted with the sensor holder and hooter-cum-flasher.
Sensor Accuracy
| Sensor technology | Calibration accuracy |
|---|---|
| Electrochemical | ±2% of full scale |
| Catalytic/Pellistor | ±2% of full scale |
| NDIR – CH₄, CO₂ or C₃H₈ | ±10% of applied gas |
| PID: 0–5,000 PPM | ±10% of applied gas |
| PID: 0–1,000 PPM | ±5% of applied gas |
| PID: 0–50 PPM | ±3% of applied gas |
Available Gas Categories
Oxygen and Nitrogen
- Oxygen: 0–25% v/v
- Oxygen: 0–100% v/v
- Nitrogen: 0–100% v/v
Toxic Gases
Available gases include:
- Ammonia
- Bromine
- Carbon monoxide
- Chlorine
- Ethylene oxide
- Hydrogen
- Hydrogen bromide
- Hydrogen chloride
- Hydrogen cyanide
- Hydrogen fluoride
- Hydrogen sulphide
- Ozone
- Phosphine
- Nitrogen dioxide
- Nitric oxide
- Sulphur dioxide
NDIR Gases
- Carbon dioxide
- Methane
- Propane/LPG
PID/VOC Detection
- Isobutylene
- Other compatible volatile organic compounds
Combustible Gases
Detection is available for numerous combustible gases in the 0–100% LEL range, including:
- Acetone
- Acetylene
- Ammonia
- Butane/n-butane
- Carbon monoxide
- Ethanol
- Ethyl acetate
- Ethylene
- Hexane
- Hydrogen
- Isopropanol
- Methane
- Methanol
- N-heptane
- N-pentane
- Propane/LPG
- Toluene
- Unleaded petrol
- CNG, LNG, LPG and natural gas
Note: The exact measuring range, resolution and sensor technology should be selected according to the target gas and application.
Approvals and Compliance
- Flameproof protection:
Ex db IIC T6 Gb - Dust ignition protection:
Ex tb/tc IIIC T85°C Db/Dc - Intrinsic safety protection:
Ex ia IIC T6 Ga - Ingress protection: IP66/IP68
- EMI/EMC compliance: EN 50270
- PESO/CMFR-approved enclosure and cable-gland options
Applications
- Refineries and petrochemical plants
- Chemical-processing plants
- Fertilizer plants
- Gas-cylinder banks and storage areas
- Gas-pipeline projects
- Cold-storage facilities
- Sewage-treatment plants
- Power and industrial plants
- Chemical-storage areas
- Burner and furnace areas
- Paint shops
- Pulp and paper plants
- Offshore drilling and processing platforms
- Confined spaces
- Ambient and stack monitoring
- Gas-metering stations and skids
Optional Accessories
- Certified 24 V DC power supply
- Canopy and mounting stand
- Gas-calibration kit
- PESO-certified hooter-cum-flasher
- Gas-sampling and conditioning system
- RS-485-to-USB or RS-232 converter
- Ethernet converter
- PC-based SCADA software and modem
Standard Deliverables
- Test and calibration certificate
- Reference calibration-gas certificate
- Operation and maintenance manual
- Standard mounting hardware
