AVAILABLE · LAB 02 / HANDS-ON LEARNING
Pressure Transmitter Calibration
Apply a known pressure. Measure the difference. Keep the evidence.
Configure → Apply Pressure → Measure → Record → Diagnose → Adjust → Recheck → Compare
Your calibration bench
PNEUMATIC CONNECTIONS · shared pressure manifold
ELECTRICAL WIRING
Loop power (+) → Transmitter → Series mA measurement → Loop power (−)
Functional bench diagram. Pressure and electrical connections are separate. Reference and transmitter share the same pressure in this model.
1. Configure
All pressures are bar gauge. Positive-pressure bench: 0–100 bar.
Exercise tolerance defaults to ±0.5% output span (±0.080 mA). This is not a traceable calibration certificate.
2. Apply, measure & record
3. Recorded evidence
Five points upscale, then four downscale. The 100% turnaround is recorded once. Completed as-found evidence is locked.
As-Found
Not complete
As-Left
A new full run is required after adjustment.
4. Diagnose & adjust
These are educational adjustments, not HART commands, sensor trim or manufacturer procedures. Record as-found first. Correct range configuration before adjustment.
Zero adds a constant mA correction. Span changes the gain of the 16 mA span; it does not move the configured lower endpoint. Endpoint adjustment cannot repair nonlinearity.
Guided challenges
Inspect multiple pressure points before choosing a diagnosis. Pressure controls stay available.
Model, assumptions & safe interpretation
Expected mA = 4 + 16 × (measured reference − required LRV) / required span. Error is measured minus expected; % span error = 100 × error / 16. Evaluation uses unrounded values.
Deterministic educational response: 4 + zero error + zero correction + 16 × (1 + gain error + gain correction) × x + 4 × nonlinear coefficient × x × (1 − x), where x uses the configured transmitter range. No random noise or hysteresis. Upscale and downscale coincide for this memoryless model.
Output limits 3.8–20.5 mA are teaching conventions, not universal device settings. Saturation is reported. Reference and current measurements are idealized; no uncertainty budget, compliance, temperature, vacuum or absolute-pressure model. Do not use this exercise as a field procedure.