Thermo 48i - Page 5

Contents
Thermo Electron Corporation Model 48i Instruction Manual v
Analog Output Calibration ..............................................3-114
Analog Input Calibration .................................................3-117
Display Pixel Test ............................................................3-120
Restore User Defaults.......................................................3-121
Password .............................................................................3-121
Lock Instrument ..............................................................3-122
Change Password .............................................................3-122
Remove Password.............................................................3-123
Enter Password.................................................................3-124
Chapter 4 Calibration........................................................................................4-1
Equipment Required...............................................................4-1
CO Concentration Standard................................................4-1
Zero Air Generator ..............................................................4-1
Flow Meter(s) and Controller(s)...........................................4-2
Pressure Regulator for CO Standard Cylinder......................4-3
Mixing Chamber..................................................................4-3
Output Manifold .................................................................4-3
Pre-Calibration .......................................................................4-3
Calibration..............................................................................4-3
Connect the Instrument.......................................................4-3
Zero Adjust..........................................................................4-4
Span Adjust..........................................................................4-5
Additional Concentration Standards ....................................4-6
Calibration Curve ................................................................4-6
Calibration Frequency..........................................................4-6
Periodic Zero and Span Checks...............................................4-6
References ...............................................................................4-7
HI and LO Multi-Point Calibration .......................................4-7
Default Coefficients .............................................................4-8
Cal Point 1, 2, and 3 Adjust.................................................4-8
Chapter 5 Preventive Maintenance ...............................................................5-1
Replacement Parts...................................................................5-1
Cleaning the Outside Case......................................................5-2
Cleaning the Optics ................................................................5-2
IR Source Replacement ...........................................................5-3
Fan Filter Inspection and Cleaning .........................................5-3
Leak Test and Pump Check Out.............................................5-4
External Leaks......................................................................5-4
Leaks Across the Optional Zero/Span and
Sample Solenoid Valves........................................................5-4
Pump Rebuilding....................................................................5-5