GS8420-LEL Portable Combustible Gas Detector
Multi-purpose handheld LEL detector with pump or diffusion mode
- Range
- 0-100 %LEL
- Accuracy
- ±5% LEL
- Weight
- 0.6 kg
- Battery
- 16 hours
Overview
Versatile portable LEL detector with switchable pump and diffusion modes. Ideal for leak detection, confined space clearance, and hot work permits.
- Switchable pump / diffusion mode
- Gas library: 60+ calibration gases
- Drop-tested to 3 meters
- Intrinsically safe: ATEX Zone 0
Full Technical Specifications
Key Performance
| Metric | Value | Status |
|---|---|---|
| Range | 0-100%LEL | confirmed |
| Accuracy | ±5% LEL | confirmed |
| Response | <10 s T90 | confirmed |
| Gas Library | 60+ correction factors | confirmed |
| Runtime | 16 hours continuous | confirmed |
Measurement
| Specification | Value |
|---|---|
| Measuring Principle | Catalytic Bead with IR backup option |
| Measurement Range | 0–100 %LEL |
| Accuracy | ±5% LEL |
| Response Time (T90) | <10 s |
| Gas Library | 60+ pre-programmed correction factors |
Physical
| Specification | Value |
|---|---|
| Dimensions (W×H×D) | 170 × 75 × 42 mm |
| Weight | 0.6 kg |
| Housing Material | Rubberized polycarbonate, IP67 |
| Display | 2.4″ color LCD |
Electrical
| Specification | Value |
|---|---|
| Battery | Li-ion 3.7 V, 3600 mAh rechargeable |
| Runtime | 16 hours continuous |
| Charging | Drop-in cradle or USB-C |
| Data Logging | 10,000 event log |
Environmental
| Specification | Value |
|---|---|
| Operating Temperature | -20 °C to +55 °C |
| Storage Temperature | -30 °C to +70 °C |
| Humidity | 0–99% RH |
| Drop Test | 3 m onto concrete (MIL-STD-810G) |
Certifications
| Specification | Value |
|---|---|
| ATEX | II 1G Ex ia IIC T4 (Zone 0) |
| Ingress Protection | IP67 |
| EMC | EN 61326-1 |
| 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 1G Ex ia IIC T4 Ga | Zone 0 portable combustible-gas detector installation | Project variant | approved | On request |
| IECEx / CSA / FM / MSHA | Approvals listed in existing 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 |
| IEC 60079-0/11 / ANSI/ISA 92.00.01 | Standards listed in existing certification detail | Project variant | approved | On request |
| IP67 | 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
Portable %LEL detector workflow for hot-work and hydrogen safety surveys
Application note based on the existing industrial-maintenance scenario: portable catalytic-bead LEL detection with pump/diffusion modes and gas-library correction factors supports hot-work permits, confined-space checks, and hydrogen %LEL safety surveys. Use case fit depends on target gas, bump-test practice, and whether ppm-level LDAR or process hydrogen purity is required.
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
Catalytic bead LEL detection with IR backup option supports portable combustible-gas safety surveys.
Requires
- Target gas selected from the 60+ gas library before survey work
- Pump or diffusion mode selected for the inspection workflow
- Bump test before each use or daily per v1 FAQ
Interferents and Limits
- Catalytic bead readings require the correct gas correction factor for the selected target gas
- Hydrogen %LEL is a safety-detection duty in the combustible-gas-detector path, not a process hydrogen purity measurement
- Safety-level %LEL duty, not EPA Method 21 ppm-level LDAR surveys
- Hydrogen process %vol or purity applications should use a process hydrogen analyzer path
02 Operating Envelope
Use these limits as selection inputs, then confirm sample condition, ambient exposure, and materials before quotation.
- EPA Method 21 LDAR surveys requiring ppm-level sensitivity
- Process hydrogen purity or %vol measurement
03 Sample System Boundary
Sampling mode, conditioning components, and exclusions define where the analyzer responsibility ends and the sample system begins.
- switchable pump mode
- diffusion mode
- drop-in cradle or USB-C charging
- 10,000 event log
- Not configured as an extractive process analyzer
04 Calibration & Validation site-specific
Calibration method, interval, traceability, and audit support are shown only when structured data is available.
Zero / Span Method
Bump test before each use or daily using BT-200 automatic bump/calibration station
Interval
Before each use or daily bump test per v1 FAQ
Span Gas Traceability
Target-gas bump-test gas required for the selected target gas
05 I/O & Integration
Signal outputs and communication interfaces shown from the published specification fields on this product page.
Charging
Drop-in cradle or USB-C
Data Logging
10,000 event log
Display
2.4″ color LCD
Integration Review Note
Confirm event-log download workflow, gas-library correction-factor setup, and fleet documentation 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 before each use or daily using the BT-200 automatic bump/calibration station
- Gas-library correction factor review before each target-gas survey
- Pump-mode flow path review before confined-space or leak-detection work
- Event-log download review when permit or fleet records are needed
- Target-gas bump-test gas
- BT-200 bump/calibration station consumables if used by site procedure
07 Application Evidence
Application context from complex industrial environments.
Application Context
Maintenance contractors performing hot-work permits across multiple chemical plants typically standardize on different LEL instruments per site, which inflates the instrument fleet and creates cross-site calibration drift.
Architecture Response
GS8420-LEL with a 60+ gas library removes the need for instrument variants per site, and one-touch gas selection with built-in correction factors keeps readings comparable across all hot-work jobs.
Frequently Asked Questions
What is the gas library and how does it work?
The built-in library contains correction factors for 60+ combustible gases. Select your target gas from the menu, and the detector automatically applies the correct factor to display accurate %LEL for that specific gas.
What is the difference between pump and diffusion mode?
Pump mode draws sample through a probe at 500 mL/min — ideal for leak detection and confined space testing before entry. Diffusion mode is for personal monitoring where the detector clips to clothing.
Is it intrinsically safe for Zone 0?
Yes, ATEX II 1G Ex ia IIC T4 Ga — the highest intrinsic safety rating. The instrument cannot generate sufficient energy to ignite any gas, even in Zone 0 conditions.
How often should I bump test?
Before each use or daily, per manufacturer recommendation and most facility safety protocols. BT-200 automatic bump/calibration station supports hands-free verification.
Can I use it for gas leak surveys (EPA Method 21)?
The GS8420-LEL is designed for safety-level LEL detection. For EPA Method 21 LDAR surveys requiring ppm-level sensitivity, use GS8510-PID or GS8500-FID.
Related & Alternatives
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View ProductsCompare GS8420-LEL with adjacent options
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When this model is preferred
Select GS8420-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 GS8420-LEL against site conditions
Send gas range, sample temperature, pressure, moisture, and certification needs before final model selection.