1. 6890 GC Detectors - The Flame Ionization Detector

2. 6890 GC Detectors - The Flame Ionization Detector - Main Components
Igniter
Teflon Insulator
Collector
Interconnect/Spring
Electrometer
Jet
Heater/Sensor Assembly
Detector Base Assembly
Column Adapter

3. 6890 GC Detectors - The Flame Ionization Detector

4. 6890 GC Detectors - The Flame Ionization Detector - Theory of Operation
1. H2 - Air Flame
2. Sample is burned in flame
3. When burned produces charged Ions
4. Ions attracted to collector
5. Collector current converted to output via Electrometer

5. 6890 GC Detectors - The Flame Ionization Detector
FID EPC Flow Manifold
Detector Pneumatic Connection
Gas Connections to GC
FID Flow Measurement Tool
FID Jet
Plugged FID Jet

6. 6890 GC Detectors - The Flame Ionization Detector
FID Igniter Replacement
Complete Detector Assembly
FID Collector Removal

7. 6890 GC Detectors - The Flame Ionization Detector - Jets
Jets for Capillary-Optimized FID
Jet Type
Part Number
Jet Tip id
Capillary G
0.29 mm
0.011"
High Temp G
0.47mm
0.018"
Jets for Adaptable FID
Jet Type
Part Number
Jet Tip id
Capillary
0.29mm
0.011"
Packed
0.47mm
0.018"
Wide bore
0.030"
Packed
High Temp Capillary
0.47mm
0.018"

8. 6890 GC Detectors - The Flame Ionization Detector

9. 6890 GC Detectors - The Flame Ionization Detector

10. 6890 GC Detectors - The Flame Ionization Detector
6890 EPC Module Original Design New Detector Mini-fold

11. 6890 GC Detectors - The Flame Ionization Detector

12. 6890 GC Detectors - The Flame Ionization Detector

13. 6890 GC Detectors - The Flame Ionization Detector

14. 6890 GC Detectors - The Flame Ionization Detector

15. 6890 GC Detectors - The Flame Ionization Detector

16. 6890 GC Detectors - The Flame Ionization Detector

17. 6890 GC Detectors - The Flame Ionization Detector
Flame won't light
Measure Flows
Clean/Replace Jet (6850 Jet Test)
Are column and fittings tight ?
Is the tank pressure high enough ?
Is the Detector ON ?

18. 6890 GC Detectors - The Flame Ionization Detector
Noisy Baseline
Turn off
Air/H2 No
Contamination
Still Noisy
problem
Yes
Electronic/Mechanical
Problem
Check:
Filters,Traps,Gasses
Clean Jet
Replace Detector
Verify Column max
Board/ interconnect/
Teflon Insulators

19. HP 6890 - Flame Ionization Detector
Planned Maintenance
- Replace Jet (per Customer)
- Clean/Replace Collector
- Inspect interconnect and spring
- Inspect ignitor glo-plug - replace if necessary
- Measure H2/Air/Makeup Flows
- Turn off H2 and measure FID Leakage Current - < 2pA
- Ignite FID - monitor background and noise
<20 pA and stable
- Run customer sample or Agilent Checkout per Service Manual section 600.