Flash Point Analyzer – Troubleshooting Decision Tree
Flash point deviations are usually caused by heating rate errors, ignition system failure, contamination, or sensor drift. Use this structured logic before recalibration.
Problem 1 – Flash Point Reading Too Low
- Check for light hydrocarbon contamination
- Verify sample storage conditions
- Confirm heating ramp rate matches ASTM
- Inspect temperature sensor calibration
- Check ignition timing interval
Even 1–2% contamination of lighter fraction can reduce flash point significantly.
Problem 2 – No Flash Detected
- Check ignition source (spark/flame)
- Verify ignition energy output
- Inspect sample volume correctness
- Confirm temperature sensor reading accuracy
- Ensure lid closure in closed-cup method
Problem 3 – Temperature Overshoot
- Heating controller PID instability
- Faulty RTD or thermocouple
- Improper heating ramp configuration
- Loose sensor contact
Overshoot directly affects ASTM compliance.
Problem 4 – Poor Repeatability
- Inconsistent sample stirring
- Variable ignition interval
- Improper cleaning between samples
- Drafts or airflow in lab
- Non-certified reference material