26 3600 Analyzer for O
2
Measurement—Operator’s Manual
3600O2.OM.E9903
WHICH MODE?
MODE 0 MODE 1
“Mode 0” offers a test of the “ñ” and “ò” keys in “continuous” mode. Hold
down either one of those keys, and check to see if the word “UP” or “DOWN”
(respectively) flashes as the key is depressed.
“Mode 1” tests the “ñ”, “ò”, and “ENTER” keys in “latched” mode. Press one of
those keys individually and release; the LCD should continue to flash the
corresponding word. Pressing “ESC” releases you from this test.
The “Memory” diagnostics uses the RS-232 output to download information
about your instrument to a printer or other data acquisition device. While nothing
will appear on the LCD for this test, the information will be downloaded instantly.
The information will appear at the RS-232 output as hexadecimal code, and will be
of use to an Orbisphere representative to check whether your instrument has been
properly configured.
1.4.9 Rolling Average
The “Rolling Average” feature causes the O
2
concentrations to be averaged over
successive measurement cycles for display or output. It suppresses sharp peaks
and troughs caused by pressure shocks, electrical spikes, flow variations etc., while
retaining reasonably fast response to real concentration changes.
Press “ENTER” when “Rolling Average” is flashing under the “Modify Options”
menu to display the following menu.
ROLLING AVERAGE
DISABLED 3 5 7 9
You can choose to disable the rolling average, or enable the feature for averaging
over 3, 5, 7, or 9 successive measurement cycles.
A cycle is completed in one second for the LCD and analog outputs. For example,
choosing “5” lets you see the measurement displayed, or output, as an average of
five measurements made in as many seconds, updated every five seconds.
For the RS-232 digital output, a cycle is completed in four seconds. Thus, in this
example, choosing “5” would give you an average of five measurements made in
20 seconds, and updated every 20 seconds.
1.4.10 Gas To Measure, CO
2
/H
2
S Insensitivity
Activating this menu allows you first to confirm that your instrument is configured
for O
2
measurement, and then to activate either (but not both!) the “CO2
Insensitive” or “H2S Insensitive” instrument configurations.
Pressing “ENTER” while “Gas” is flashing under “Modify Options” first reveals
the “Gas to Measure” menu. You should see “O2” displayed. (If not, contact your
Orbisphere representative for appropriate service.)
Then press “ENTER” to display this menu:
CO2 INSENSITIVE
NO YES
This is of interest in carbonated samples where high levels of carbon dioxide
would otherwise interfere with accurate O
2
measurement. Pressing “ENTER”
when “YES” is flashing will automatically return you to the “Modify Options”
menu. If you choose “NO”, you are given the opportunity to switch the
instrument to “H2S Insensitive” mode:
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