Swann AMI Oxytrace - Quality Assurance of the Instrument

AMI Oxytrace QED
Maintenance
A-96.250.531 / 300617 51
6.8. Quality Assurance of the Instrument
Every SWAN on-line instrument is equipped with integrated, auton-
omous quality assurance functions to survey the plausibility of each
measurement.
For the AMI Oxytrace/AMI Oxytrace QED these are:
 continuous monitoring of sample flow
 continuous monitoring of the temperature inside the transmit-
ter case
 periodic accuracy test with ultra high precision resistors
Further a manual, menu driven inspection procedure can be carried
out using a certified reference instrument. Running at the same
sampling point as an inspection equipment, the AMI Inspector Oxy-
gen verifies the measuring results. After enabling the quality assur-
ance procedure by defining the quality assurance level, the
instrument reminds the user periodically to run the procedure and
results are stored in a history for review.
Quality
assurance
level
Central feature of the quality assurance function is the assignment
of the monitored process to a Quality assurance level.
There are three predefined levels plus a user level. Hereby the in-
spection interval, the deviation limits of temperature and measuring
result between the inspection equipment and the monitoring instru-
ment are defined.
 Level 1: Trend; Measurement used as an additional informa-
tion to follow the process indicating trends.
 Level 2: Standard; Monitoring of several parameters of a pro-
cess (e.g. oxygen, saturation). In case of instrument failure,
other parameters can be used for process monitoring.
 Level 3: Crucial; Monitoring of critical processes, value is
used for control of another part or subsystem (valve, dosing
unit, etc.).
Additional level:
 Quality level 4: User; User defined inspection interval, maxi-
mal deviation of temperature and measuring result.