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Keys........................................................................................... 43
Fixed Keys............................................................................ 43
Soft Keys............................................................................... 43
Beginning Operation.................................................................. 43
Turning the 2020PROPlus On ............................................. 43
Default Display..................................................................... 44
Numeric Value, Duration, Time and Date Entry.................. 45
System Alerts and Alarms..................................................... 46
User Interface – Basic Menu ..................................................... 47
Operation Modes ....................................................................... 47
Logging Off Mode ................................................................ 47
Tag Mode.............................................................................. 47
Interval Mode ....................................................................... 48
Short-Term Exposure Limit (STEL) Mode ........................... 48
Time-Weighted Average (TWA) Mode.................................. 48
PEAK Mode.......................................................................... 49
Datalogger ................................................................................. 49
Interval Operation................................................................ 49
Unit Setup Functions................................................................. 51
Pump..................................................................................... 52
Backlight............................................................................... 53
User Mode............................................................................ 53
Passcode............................................................................... 55
Date Format ......................................................................... 55
Language.............................................................................. 55
Units ..................................................................................... 55
Sample Mode........................................................................ 56
Response Factor Library............................................................ 56
Response Factors and Memory Slots ................................... 57
Calibration Technical Description............................................. 58
Calibration Introduction ............................................................ 60
Compressed Gases ............................................................... 60
Regulators for Compressed Gases ....................................... 61
Calibration Gas.................................................................... 61
Calibration Using the Flow-Match Regulator ........................... 61
Connecting the Flow-Match Regulator to the Cylinder....... 61
Calibrating the 2020PROPlus with the Flow-Match Regulator
.....62
Calibration Using a Gas Bag ..................................................... 63
Preparing the Calibration Gas Bag and the Zero Air Bag .. 63
Calibrating the 2020PROPlus with a Gas Bag.................... 64
Preparing for Field Operation.................................................... 66
Field Check List.................................................................... 66
Operational Check List ........................................................ 67
Connecting Accessories.......................................................................... 68
Computer................................................................................... 68
Pre-filter Tube Holder ............................................................... 70
Pre-filters and Sample Collection Tubes................................... 71
Sample Line............................................................................... 71
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