Oxigraf O2iM NEMA 4X Oxygen Analyzer
February 13, 2007 08-0427-B0, Manual, O2iM.doc Page 19
5. Configuration Parameters
Various configuration parameters are accessible from the Setup menu and can be modified to affect
instrument operation. See the description of Setup mode for details on how to view and modify
parameters.
5.1 O2 Filter
The O2 filter parameters set the time response of the oxygen measurement. The filter parameter,
ranging from 0 to 13, selects the type of filtering applied to the measured value.
n Step Response
0
No filtering
1
20 ms running average
2
40 ms running average
3
80 ms running average
4
160 ms running average
5
200 ms exponential response
6
300 ms exponential response
7
500 ms exponential response
8
1 second exponential response
9
2 seconds exponential response
10
4 seconds exponential response
11
8 seconds exponential response
12
16 seconds exponential response
13
Prediction filter to enhance response time
5.2 Number of Multipoint Channels
If the multipoint scan option is installed then this parameter is used to set the number of channels to
scan, ranging from 0 to 4. Set this parameter to zero to continuously sample channel 0 and disable
display of the channel number in the O2 reading display.
5.3 Scan Sample Time
If the multipoint scan option is installed then this parameter sets the time in seconds that each
channel is sampled.
5.4 O2 Measurement Range
The O2 Measurement Range parameter may be available depending on the factory configuration.
Low range allows the instrument calibration to be optimized for a maximum O2 concentration less
than 100%. The front-end analog absorption gain in each range is adjusted by Span Cal for the best
signal to noise ratio at the input to the absorption A/D converter. Note that each mode and range has
its own independent set of calibration and pressure compensation factors that are loaded when the
mode or range is changed. Consequently, each mode or range must be individually calibrated prior
to use.
5.5 O2 Measurement Mode
The O2 Measurement Mode Setup may be available depending on the factory configuration. XC
mode is standard on the O2iM. Factory configuration determines if XC/LN mode choice is available.
Press the UP or DOWN key to switch to the alternate mode, if so configured. XC mode offers the
best accuracy for gas mixtures that contain components that broaden the oxygen absorption line, such
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