GS8410-LEL IR Combustible Gas Detector
Infrared LEL detector — reduced catalyst-poison sensitivity and oxygen-independent optical response
- Range
- 0-100 %LEL
- Accuracy
- ±5% LEL
- Rating
- ATEX Zone 1, SIL 2
- Sensor Life
- >10 years
Overview
Fixed-point infrared combustible gas detector that operates without an oxygen-supported catalytic reaction and is less exposed to common catalyst inhibitors. Suitable for environments where catalytic sensors are constrained.
- Reduced exposure to common catalyst poisons
- Works in oxygen-depleted atmospheres
- 10+ year sensor lifespan
- Fail-safe operation with self-diagnostics
Full Technical Specifications
Key Performance
| Metric | Value | Status |
|---|---|---|
| Range | 0-100%LEL | confirmed |
| Accuracy | ±5% LEL | confirmed |
| Response | <8 s T90 | confirmed |
| Safety Rating | ATEX Zone 1, SIL 2 | confirmed |
| Sensor Life | >10 years | confirmed |
Measurement
| Specification | Value |
|---|---|
| Measuring Principle | Dual-wavelength Infrared Absorption |
| Measurement Range | 0–100 %LEL |
| Accuracy | ±5% LEL |
| Response Time (T90) | <8 s |
| Resolution | 1% LEL |
Physical
| Specification | Value |
|---|---|
| Dimensions (W×H×D) | 195 × 185 × 115 mm |
| Weight | 2.4 kg |
| Housing Material | 316SS Ex d flameproof, IP66 |
| Mounting | Wall/pipe mount, 3/4″ NPT entries |
Electrical
| Specification | Value |
|---|---|
| Power Supply | 24 VDC (18–32 VDC) |
| Analog Output | 4–20 mA with HART 7 |
| Relay Outputs | 2 × SPDT |
| Power Consumption | <5 W |
Environmental
| Specification | Value |
|---|---|
| Operating Temperature | -40 °C to +65 °C |
| Humidity | 0–99% RH |
| Ingress Protection | IP66 |
| Sensor Life | >10 years with scheduled optical checks |
Certifications
| Specification | Value |
|---|---|
| ATEX | II 2G Ex d IIB+H2 T4 (Zone 1) |
| Functional Safety | SIL 2 per IEC 61508 |
| Performance | EN 60079-29-1 |
Where This Analyzer Fits
This model is mapped to the following industry applications and process duties.
Deployment Environments
Common process environments where this model is evaluated.
Certification Scope
Standards are listed with scope and status so engineering review can verify the applicable enclosure, area, and safety case.
| Standard | Scope | Variant | Status | Document |
|---|---|---|---|---|
| ATEX II 2G Ex d IIB+H2 T4 Gb | Zone 1 fixed combustible-gas detector installation | Project variant | approved | On request |
| IEC 61508 SIL 2 | Functional safety rating stated in key specs, specifications, and certification detail | Project variant | approved | On request |
| EN 60079-29-1 | Combustible gas detector performance standard listed in specifications and certification detail | Project variant | approved | On request |
| IECEx / CSA / FM / UKCA | Approvals listed in existing certification detail | Project variant | approved | On request |
| IP66 | Ingress rating listed in specifications and certification detail | Project variant | approved | On request |
Request Documentation
Request technical datasheets, user manuals, certificates, and application notes for this model.
Evidence Notes
IR %LEL detector architecture for inert-blanket safety duty
Application note based on the existing offshore and nitrogen-blanketed vessel scenario: dual-wavelength IR %LEL detection supports combustible-gas safety monitoring where oxygen-dependent catalytic sensing is not the preferred path. Detector choice depends on target gas, optical-path maintenance, and site proof-test policy.
Technical & Engineering Details
Secondary engineering detail — expand each topic for the full measurement, envelope, sample-system, calibration, integration, maintenance and application evidence.
01 Measurement Principle and Limits
How the measurement is bounded
Dual-wavelength infrared absorption detects IR-absorbing combustible gases for fixed-point %LEL safety monitoring.
Rejects
- Catalyst poisoning path described for catalytic bead detectors
- Oxygen dependency described in the IR vs catalytic bead FAQ
Requires
- Optical-path integrity monitoring through the self-diagnostic fault-alarm function stated in v1 FAQ
- Technology selection review when hydrogen detection is required
Interferents and Limits
- Window contamination or optical blockage triggers a fault-alarm condition
- Hydrogen is not detected because it is a non-IR-absorbing gas
- Hydrogen %LEL safety duty requires catalytic bead or dedicated hydrogen safety detection
- Safety-level %LEL duty, not process hydrocarbon concentration analysis
02 Operating Envelope
Use these limits as selection inputs, then confirm sample condition, ambient exposure, and materials before quotation.
- Hydrogen detection
- Process concentration measurement outside %LEL safety duty
03 Sample System Boundary
Sampling mode, conditioning components, and exclusions define where the analyzer responsibility ends and the sample system begins.
- Wall/pipe-mounted Ex d flameproof detector with diffusion optical path
- Self-diagnostic optics with optical-path integrity monitoring
- No external extractive conditioning system is declared for this fixed-point detector
- Window contamination or optical blockage triggers a fault-alarm condition
04 Calibration & Validation
Calibration method, interval, traceability, and audit support are shown only when structured data is available.
Zero / Span Method
Dedicated zero/span method not stated in v1 source data
Bump / Proof-Test Interval
Bump-test and proof-test interval to be set by the site functional-safety procedure
Span Gas Traceability
Calibration gas selected for the target combustible gas
Sensor Life
>10 years stated in key specs and specifications
05 I/O & Integration
Signal outputs and communication interfaces shown from the published specification fields on this product page.
Analog Output
4–20 mA with HART 7
Relay Outputs
2 × SPDT
Power Supply
24 VDC (18–32 VDC)
Power Consumption
<5 W
DAHS Review Note
Confirm protocol map, channel naming, alarm states, and reporting format during project integration review.
06 Maintenance & Spares site-specific
Tasks, consumables, and access items are shown only when structured maintenance data is available.
- Bump-test and proof-test interval to be set by the site functional-safety procedure
- Optical-path contamination review when fault alarms indicate blockage, window contamination, or source degradation
- Hydrogen detection requirement review before using IR LEL technology
- Calibration gas selected for the target combustible gas
Cell Life
>10 years stated in key specs and specifications
07 Application Evidence
Application context from complex industrial environments.
Application Context
FPSO operators need LEL detection in nitrogen-blanketed cargo tanks, where catalytic-bead sensors are unsafe due to oxygen depletion — and where any false positive can trigger a costly tank-isolation cycle.
Architecture Response
GS8410-LEL with self-diagnostic optics maintains calibration accuracy across multi-year service in inert-blanket duty, and the long-life optical sensor pattern avoids the periodic catalytic-bead replacement that drives most fleet OPEX.
Frequently Asked Questions
Why choose IR over catalytic bead?
IR detection works without an oxygen-supported catalytic reaction, which matters in nitrogen-blanketed spaces, and is less exposed to silicones or lead compounds than catalytic beads. It has 10+ year sensor life with scheduled optical checks. The trade-off is slightly lower accuracy and no response to hydrogen.
Can it detect hydrogen?
Hydrogen is a non-IR-absorbing gas. For hydrogen detection, use the GS8400-LEL catalytic bead detector or a dedicated electrochemical hydrogen sensor.
What causes the 10-year sensor life?
IR sensors use an optical source and detector rather than a consumable sensing cell. Dual-wavelength reference compensation corrects for defined optical path contamination, and the optical path still requires scheduled inspection.
Does it work in oxygen-free atmospheres?
Yes, this is a primary advantage. IR detection is purely optical and does not require oxygen for operation, making it ideal for nitrogen-blanketed vessels, inerted reactors, and CO₂-rich environments.
How does fail-safe operation work?
The detector continuously monitors optical path integrity. Any blockage, window contamination, or source degradation triggers an automatic fault alarm — the system fails to a safe (alarm) state, never to a false-safe condition.
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View ProductsCompare GS8410-LEL with adjacent options
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When this model is preferred
Select GS8410-LEL when its measurement principle, range, and form factor match the process duty and certification scope.
When to consider an alternative technology
Consider another analyzer when the gas matrix, sample temperature, hazardous-area scope, or reporting requirement falls outside the stated envelope.
Review GS8410-LEL against site conditions
Send gas range, sample temperature, pressure, moisture, and certification needs before final model selection.