Specifications

Instruction 0019-9208
5
N
2
O Monitor 3010
2.5 Normal ppm Mode
This mode provides real-time readings of the N
2
O concentration present in
the surrounding area.
The monitor’s display is toggled between its TWA/twa and normal ppm
modes by pressing the f1 button.
In this mode the gas level shown on the display is the cur rent gas level
that is being de tect ed by the monitor. For example, the following display
shows that the current detected N
2
O level is 120 ppm.
Note that if a fl ashing “0” reading appears, this is an indication that
neg a tive drift has occurred, and that the monitor needs to be re-zeroed per
Section 3.7 Zero Cal i bra tion.
2.6 Time Weighted Average (TWA/twa) Mode
The monitor’s display is toggled between its normal ppm and TWA/twa
modes by pressing the f1 button.
It is important to know that the time weighted average reading is avail-
able in two formats. This is designed to provide op er a tors with the most
appropriate data on their average ppm N
2
O ex po sure in the working envi-
ronment. The two formats are identifi ed by the ap pear ance of the letters
“TWA” or “twa” in the display. Be aware that the TWA/twa cal cu la tion
gains more signifi cance the longer the monitor is operating. This applies to
both formats.
Note: The TWA/twa format is a factory setting, but can be
changed by using the optional BACH-COM soft ware. The fac-
tory default is the lower case (twa) format.
• TWA (in upper case) is being calculated over a set 8-hour period. This
mode is designed to show the user’s average ppm N
2
O exposure level
during a typical work day.