3600 Analyzer for O
2
Measurement—Operator’s Manual 27
3600O2.OM.E9903
H2S INSENSITIVE
NO YES
Note that operating in this mode requires a different sensor electrolyte, model
2961, to be used in place of the standard electrolyte. It is supplied in a
pharmaceutical-type bottle with a septum that must be punctured and drawn out
with the syringe supplied with your recharge kit. The instrument reminds you of
this requirement by displaying a message “Changed Electrolyte?” which will flash
for five seconds after you have answered “YES” to this option.
Also, note that when using this mode your system will experience a marked
sensitivity loss, about 50 times greater levels of minimum detectability. That is, if
your membrane listed in section 3 gave a lower limit of, say, 1 ppm, the H
2
S
Insensitive mode would allow you to measure down to only 50 ppm.
1.4.11 Membrane Selection
Should you need to either confirm your present choice of membrane or select
another, highlight “Membrane” under the “Modify Options” menu and press
“ENTER”. This screen appears:
SELECT MEMBRANE
29552 2956 2958
The complete list of membranes available is: 2956, 2958, 29552, 2952, 2995, 2935,
and 29521. Highlight the membrane model number used on your sensor, then
press “ENTER” to activate your selection. Membrane characteristics, including
recommended flow rates, are listed in section 3.1.
Note: If you select any membrane (even if you reselect the same membrane and
press “ENTER”), you must re-calibrate the sensor, as described in section 1.3.3.
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