actual N
2
O levels, eg greater than 300ppm.
As with previous modes it is possible using Analyser Data Manager to change the ‘Site’ and ‘ID’ fields
to ‘Site’ and ‘Room or Area’ using the ‘Configuration’ tab.
Once IDs have been selected and accepted, readings commence immediately and are monitored
continuously. To stop monitoring the operator selects the soft-key ‘Area’, enters the stop code 5709
and presses the ‘Enter’ key. Readings are automatically stored.
Leak Detection:
‘Leak’ enables the operator to monitor the instrument in leak detection mode. This extends the range
of the N
2
O sensor up to 10,000ppm and speeds up the response time to enable it to indicate the
current level of N
2
O. This allows the instrument to work as an effective leak monitor. The operator
gets audio and visual feedback in addition to the displayed value to help with this. The back-light
changes from green-thru-yellow to red as the gas concentration increases. And the instrument’s
beeper also increases in frequency and tone to further help bring attention to any gas detected.
There are no additional user alarms or setting for this mode. It is not possible to store data whilst in
this mode.
The operator starts and stops monitoring by selecting the soft-key ‘Leak’.
Note: When monitoring gases using any of the above methods the ‘Mute’ key may be activated to
eliminate the instrument monitoring sound.
TWA and Average Calculations in ADM
This section explains how the Average and Time Weighted Average (TWA) calculations work with the
Analyser Data Manager (ADM) software.
The following parameters are optionally calculated by ADM and use the set of data currently selected
in ADM by the ID, time filters and serial number selection.
Average (ppm)
Average (ppm) = (AvgN2O
1
x AvgPeriod
1
+ AvgN2O
2
x AvgPeriod
2
+ AvgN2O
n
x AvgPeriod
n
) / number-
of-minutes from first to current filtered reading.
Note: The results in this column may change when the filter(s) are changed.
Note: The definition of the parameters of the calculation can be altered within ADM on the
Configuration tab.
TWA (ppm)
TWA (ppm) = (AvgN2O
1
x AvgPeriod
1
+ AvgN2O
2
x AvgPeriod
2
+ AvgN2O
n
x AvgPeriod
n
) / 8 hours. The
data is taken as a 24 hour window extending backward through the filtered entries.
Any missing entries within the 24hr window are assumed to be 0ppm.
Selecting the TWA filter affects the appearance of the data when it is charted within ADM, the data
between available recorded data is shown as a zero.
The definition of the parameters of the calculation can be altered within ADM, the default
configuration at installation matches the EH-40 standard.
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