How to use this hub (fast)
- Confirm the symptom using trend, alarms, and operator feedback
- Check utilities (power, instrument air, temperature, flow)
- Check sample system (probe → line → conditioning → flow)
- Check calibration path (gas, regulator, manifold, valves)
- Verify recovery with stable trend and repeat check
Most analyzer faults originate from sample system issues,
condensation, leaks, or utility instability — not electronics.
Start by Symptom
Reading Low / Zero
Restriction, blockage, wrong range, wrong gas, or warm-up incomplete.
- Verify flow at analyzer inlet
- Check filters, DP, probe blockage
- Confirm correct range and scaling
Reading High
Air ingress, leaks, wrong span value, process upset, drift.
- Leak test manifolds and sample lines
- Compare against calibration gas
- Check recent process changes
Unstable / Noisy Trend
Pressure fluctuation, moisture carryover, unstable regulator.
- Verify pressure and flow stability
- Inspect moisture traps and heat tracing
- Check grounding and shielding
Slow Response Time
Restriction, long lines, low flow, weak pump.
- Inspect filters and restrictions
- Check pump health and flow
- Verify heater temperatures
Calibration Failure
Wrong gas, leaks, unstable regulator, warm-up incomplete.
- Verify gas concentration and expiry
- Leak test calibration manifold
- Confirm valve switching
Communication / Data Gaps
Network issues, mapping errors, DAHS flags.
- Check IP, ports, comm status
- Verify tag mapping and scaling
- Confirm timestamps and quality bits
Fast Links (Analyzer-specific troubleshooting)
Add analyzer-specific troubleshooting links as content expands.