Specifications

N
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O Monitor 3010
4 Instruction 19-9208
2.3 Start-Up Display
The display that appears when the monitor is first turned ON depends on
what TWA format the monitor is currently in, and how long the monitor has
been OFF. (Refer to Section 2.5 Time Weighted Average (TWA) Mode for a
detailed description of the monitor’s two TWA formats.)
If the monitor is in its 8-hour ‘TWA’ mode and was OFF for more than
8 hours, then the first display appears at turn-on, which identifies the
monitor and shows the countdown of the monitor’s 30 minute warm-up
period. After the warm-up period expires, the monitor automatically
starts a new TWA reading. But if the monitor was OFF for less than
8 hours, then the second display appears, which gives an operator the
option of continuing the previous TWA reading by pressing the f2 button.
If the monitor is in its continuous ‘twa’ mode, then the second display
always appears at turn-on, again giving the operator the option of con-
tinuing the previous TWA reading.
If f2 is pressed, then the monitor continues operation with the previous
TWA. But if f2 is not pressed during warm-up, or if one of the other
function buttons is pressed, then the monitor automatically starts a new
TWA reading. At this time the monitor reverts to the first display for the
remainder of the warm-up period.
2.4 Normal ppm Mode
The monitor’s display is toggled between its TWA and normal display
modes by pressing the f1 button.
In this mode the gas level shown on the display is the current (real time)
gas level being detected by the monitor. For example, the following
display shows an N
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O level of 120 ppm.
Note that if a flashing “0” reading appears, this is an indication that negative
drift has occured, and that the monitor needs to be re-zeroed per Section
3.8 Zero Calibration.
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