ISO 22095 Mass Balance Chain of Custody Audit Requirements
ISO 22095 mass balance audits demand strict site boundaries, verified baseline yield conversions, and zero negative credit balances across accounting periods.
Mass Flow Meter Calibration
Meaning
Metrological verification establishes the accuracy of mass flow devices measuring gas or liquid throughput in polymer processing lines. Executing mass flow meter calibration involves comparing instrument readings against a secondary or primary mass standard under controlled pressure and temperature conditions. The procedure adjusts flow sensor scaling factors to maintain precise metering of liquid additives and blowing agents.
It governs dosing accuracy during continuous extrusion and reaction injection moulding, ending at operational boundaries where fluid viscosity or phase changes violate sensor design assumptions.
Drift Correction
Sensor drift occurs when polymer residue or physical wear alters tube vibration frequencies in Coriolis meters. Routine calibration detects measurement errors before additive dosing ratios shift off target. Corrective adjustment restores linear response across the entire operating flow range.
Dosing Precision
Precise flow control prevents aesthetic defect formation like color streaks or inconsistent foaming cell structures. Metering errors in liquid blowing agents cause density variation and part sink marks. Validated flow meters maintain narrow tolerance bands during high-speed production runs.
Verification Standard
Traceable reference standards ensure flow measurements align with national metrology standards. Field calibration rigs use gravimetric or volumetric provers to verify meter output on site. Certified calibration documentation satisfies quality management system requirements for medical and automotive moulding.