GS8500-FID Process VOC Analyzer (FID)
Flame ionization detector for continuous total VOC measurement
- Range
- 0-10,000 ppmC
- Detection
- 0.1 ppmC
- Response
- <2s T90
- Linearity
- >5 decades
Overview
Continuous process VOC analyzer using flame ionization detection for total hydrocarbon measurement. Low-range sensitivity and linear response across the stated VOC range.
- Linear response over 5 decades
- <2s response time
- Automatic hydrogen flow control
- EPA Method 25A compliant
Full Technical Specifications
Key Performance
| Metric | Value | Status |
|---|---|---|
| Range | 0-10,000ppmC | confirmed |
| Detection | 0.1ppmC | confirmed |
| Response | <2 s T90 | confirmed |
| Linearity | >5 decades | confirmed |
| Utilities | H₂ 30 mL/min; zero air 300 mL/min | confirmed |
Measurement
| Specification | Value |
|---|---|
| Measuring Principle | Flame Ionization Detection (FID) |
| Measurement Range | 0–10,000 ppmC (configurable to 50,000) |
| Detection Limit | 0.1 ppmC |
| Linearity | >5 decades |
| Response Time (T90) | <2 s |
Physical
| Specification | Value |
|---|---|
| Dimensions (W×H×D) | 483 × 310 × 500 mm (19″ 7U rack) |
| Weight | 25 kg |
| Housing Material | Powder-coated steel, SS316L sample path |
| Mounting | 19″ rack or floor-standing enclosure |
Electrical
| Specification | Value |
|---|---|
| Power Supply | 100–240 VAC, 50/60 Hz, 150 W |
| Analog Output | 2 × 4–20 mA (isolated) |
| Digital Output | Modbus RTU/TCP, RS-485 |
| Relay Outputs | 4 × SPDT |
| Display | 7″ color touchscreen |
Environmental
| Specification | Value |
|---|---|
| Operating Temperature | +5 °C to +45 °C |
| Storage Temperature | -20 °C to +60 °C |
| Humidity | 0–90 % RH (non-condensing) |
| Hydrogen Supply | Carrier grade H₂ at 30 mL/min |
| Zero Air Supply | Hydrocarbon-free at 300 mL/min |
Certifications
| Specification | Value |
|---|---|
| EPA | Method 25A compliant |
| EMC | EN 61326-1 |
| Safety | EN 61010-1 |
| Quality | ISO 9001:2015 |
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 |
|---|---|---|---|---|
| EPA Method 25A | Total gaseous organic concentration using FID, listed in features, specifications, certification detail, and FAQ | Project variant | approved | On request |
| CE / UKCA | Approvals listed in existing certification detail | Project variant | approved | On request |
| EN 61010-1 / EN 61326-1 | Safety and EMC standards listed in specifications and certification detail | Project variant | approved | On request |
| ISO 9001:2015 | Quality standard 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
FID boundary-network architecture for continuous VOC compliance records
Application note based on the existing refinery fence-line scenario: FID architecture supports continuous ppmC coverage, fast response, and Method 25A reference-method comparison for VOC monitoring programs. Site result depends on sample-line layout, calibration practice, flare-event handling, and plant data integration.
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
Flame ionization detection measures total hydrocarbon response as ppmC by ion current from a hydrogen-fueled flame.
Rejects
- PID-style ppb screening where compound-specific response is the primary duty
- GC-MS speciation when individual compound identification is required
Requires
- Carrier-grade H₂ fuel gas at the stated flow
- Hydrocarbon-free zero air at the stated flow
- Method 25A calibration, interference-check, and data-recording workflow where EPA reporting is required
- Flame-out detection, hydrogen solenoid closure, and field-enclosure review for outdoor duty
Interferents and Limits
- Non-organic gases such as CO and CO₂ are outside the hydrocarbon FID response basis
- Oxygen background and flame stability should be reviewed through the Method 25A interference-check workflow
02 Operating Envelope
Use these limits as selection inputs, then confirm sample condition, ambient exposure, and materials before quotation.
- Condensing sample path without sample-line and enclosure review
- Operation without H₂ fuel gas and hydrocarbon-free zero air utilities
03 Sample System Boundary
Sampling mode, conditioning components, and exclusions define where the analyzer responsibility ends and the sample system begins.
- SS316L sample path
- H₂ fuel gas supply
- hydrocarbon-free zero air supply
- optional NEMA 4X field enclosure with climate control
- Outdoor duty requires enclosure, climate-control, and hydrogen-supply management review
04 Calibration & Validation
Calibration method, interval, and traceability are shown only when structured data is available.
Zero / Span Method
EPA Method 25A calibration and interference-check workflow; span gas details are site-specific in v1 source data
Interval
Quarterly jet cleaning and annual detector refurbishment stated in v1 maintenance FAQ; calibration interval not fully stated
Span Gas Traceability
Method 25A calibration workflow stated in v1 FAQ
05 I/O & Integration
Signal outputs and communication interfaces shown from the published specification fields on this product page.
Analog Output
2 × 4–20 mA (isolated)
Digital Output
Modbus RTU/TCP, RS-485
Relay Outputs
4 × SPDT
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.
- Quarterly jet cleaning
- Annual detector refurbishment
- Hydrogen fuel-gas and zero-air utility review
- Flame-out interlock and hydrogen solenoid review for outdoor or field-enclosure duty
- Hydrogen fuel gas
- Hydrocarbon-free zero air
- FID jet service parts
07 Application Evidence
Application context from complex industrial environments.
Application Context
Refinery fence-line VOC compliance under EPA Method 25A is repeatedly compromised by PID networks saturating above ~2,000 ppm during flare events, leaving the regulator reference test and plant-operated data inconsistent for extended periods.
Architecture Response
An 8-unit GS8500-FID boundary network delivers continuous 0–10,000 ppmC coverage with sub-2 s response and linear behavior across 5 decades, so flare events resolve on the same sample line as the routine stream and the reference-method test can be compared against a continuous, unsaturated plant-operated FID record.
Frequently Asked Questions
Why choose FID over PID for continuous monitoring?
FID provides linear response over 5 decades (0.1–100,000 ppm), carbon-number response across hydrocarbons, and a flame-ionization path that avoids UV-lamp aging drift. PID is better for ppb-level screening but saturates above ~10,000 ppm.
Does FID require hydrogen gas?
Yes, the flame requires carrier-grade hydrogen at ~30 mL/min and hydrocarbon-free zero air at ~300 mL/min. H₂ consumption is approximately one standard cylinder per 3 months.
What is EPA Method 25A?
EPA Method 25A defines the procedure for measuring total gaseous organic concentration using FID. The GS8500-FID meets all Method 25A requirements including calibration, interference check, and data recording.
Can it operate outdoors?
Yes, with the optional NEMA 4X (IP66) field enclosure that includes climate control, hydrogen supply management, and flame-out auto-reignition.
What happens if the flame goes out?
The analyzer detects flame-out within 2 seconds and auto-reignites. If reignition fails after 3 attempts, it triggers a fault alarm and closes the hydrogen solenoid valve.
What is the annual maintenance cost?
Approximately $800–1200/year: quarterly jet cleaning, annual detector refurbishment, hydrogen fuel gas (~30 mL/min continuous) and zero air supply. Hydrogen cylinders are the primary recurring OPEX — there are no wet-chemistry reagents but H₂ is consumed continuously.
Related & Alternatives
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Compare GS8500-FID with adjacent options
Review neighboring models by technology, range, detection basis, and form factor before moving to quotation.
When this model is preferred
Select GS8500-FID 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 GS8500-FID against site conditions
Send gas range, sample temperature, pressure, moisture, and certification needs before final model selection.