Gas Densitometer Calibration Calibration Improvements Tony Wright Customer Services Manager
Agenda Background Project requirements Calibration process Typical calibration results New calibration certificates ISO17025 Laboratory Summary
Background Existing calibration stands needed replacing (25+ years old) Introduction of next generation Gas Density Meters (GDM) Need for increased automation and data logging Improved flexibility
Production Calibration Stands: Gas
Old Calibration Stands
New Calibration Stand
Project Requirements New process - elimination of transfer standards Reduced measurement uncertainties (20% improvement) Less operator intervention Simplified operator training Smaller footprint (60% reduction) Gas calibration cycle time reduction from 4 days to 1 day Improved flexibility to handle ‘special’ calibration ranges
Layout of Water Bath and Connections
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Calibration Process
Comparison Table GDM Gas Density Calibration Instruments in water bath Data Logging
Old Calibration Stand
New Calibration Stand
× (Pocket) ×
Two Calibration Range •High pressure •Low pressure Temperature Coefficients taken across 20 to 70 DegC Calibration over 10 density points at 20 DegC 7810/11/12 transfer std’s
×
Range 40 to 400 kg/m3 Argon 0-3,0-10,0-90,0-250 Kg/m3 Nitrogen Accuracy Automatic Calibration Time
(More Flexibility)
±0.1% of reading
±0.1% of reading
× 4 Days
1 Day
New Gas Calibration System – Success Factors Parameter
Old Gas System
New Gas System
Calibration Set Up Time
4 hours
1 hour
Calibration Time
4-5 days
1 day
Operator Training
4 weeks
10 days
Footprint
2.38 m2
1.84 m2
Best Uncertainty
0.096 % point
0.074 % point
Worst Uncertainty
0.109 % point
0.098 % point
ETO Non Standard Range
1 or 2 cals. manual fit with Excel
Handles Non Standard Ranges
Typical Calibration Result Range 99-90 kg/m3
Typical Calibration Result Range 2525-250 kg/m3
Typical Calibration Result Range 4040-400 kg/m3
Calibration Certificate
ISO17025 (UKAS) Calibration Laboratory Gas Density Calibration Gas Density Calibration: • Instrument in water bath • 20°C Calibration • Gas pressure balance: • 0.5 to 250 kg/m3 using Nitrogen • up to 400 kg/m3 using Argon • Better than +/- 0.06% using equations of state for calibration gas
Summary Calibration stand released to Production in August 2013 Designed to calibrate both 7812 and GDM Increased capacity offering reduced lead times on new build and repair Gas Density Meters Plan to have new calibration stand ISO17025 approved in early 2015.
Gas Densitometer Calibration - TUV NEL
Gas Densitometer Calibration Calibration Improvements Tony Wright Customer Services Manager
Agenda Background Project requirements Calibration proce...
