Chemical & Petrochemical Calibration
Chemical processing is where measurement error is most expensive per unit, because it converts directly into off-specification product, wasted raw material and rework. Reaction temperature, dosing ratio and reactor pressure define the outcome, and aggressive media attack the instruments measuring them. Documented calibration is both a quality tool and a safety one.
Typical measurement points
Recipe and ratio dosing
Component ratio decides whether the batch is on specification. A drifting dosing meter produces consistently wrong batches that look like a recipe problem.
Reactor temperature
Reaction rate and selectivity are steep functions of temperature. Sensor drift or poor thermowell immersion shifts the whole process operating point.
Reactor and vessel pressure
Both a process variable and a protective one, frequently feeding interlocks that must act correctly on demand.
Yield and material accounting
Raw material in against product out. Where they do not reconcile, calibration identifies the meter responsible.
Safety instrumented points
Measurements whose only job is to detect an abnormal condition, and which therefore need periodic proof that they still can.
Off-spec batches traced to dosing measurement rather than formulation Corrosion and chemical attack changing sensor characteristics over time Liner and electrode damage in electromagnetic meters on aggressive media Thermowell immersion too shallow, so the sensor reports wall temperature Blocked or gas-locked impulse lines invalidating a DP measurement
Quality management system evidence for batch release Calibration records supporting process safety documentation Proof-test documentation for safety loops, in line with IEC 61508 / IEC 61511 Environmental permit reporting based on measured quantities Customer and certification audits of critical measurement control
Calibration procedures follow ISO/IEC 17025 methodology; ESYD accreditation is in progress.
Related services
Common questions
Tell us about the measurement point you need checked
Describe the instrument and your plant, and we will tell you what can be verified in-situ, what needs a workshop calibration, and what it will take.
Keep your instrumentation performing at its best
Speak with SEMAC's service team to discuss your maintenance needs and plan your verification & calibration service.