3600 Analyzer for O
2
Measurement—Operator’s Manual 11
3600O2.OM.E9903
It is normal for the rightmost digits to vary slightly; this is a reaction to slight
variations in oxygen content. However, if drastic changes in temperature occur at
the sensor while in use, correct readings will lag as the sensor adjusts to the new
temperature. The instrument’s response time depends on the membrane used,
anywhere from 7.2 seconds, to 90 seconds, for 90% of total change at 25°C.
(These and other data are found in section 3, “Technical Information”.)
Measurement outputs
The 3600 instrument provides several analog output signals. The analog outputs
represent the measured oxygen concentration, sample temperature, pressure, and
a range indication. These signals are available as 0–5 Volts, 0–20 mA, or 4–20 mA.
You can rescale the oxygen concentration output for your application
requirements. See section 1.4.4 for further description of these analog outputs.
In addition, alarm relay contacts are available in certain 3600 instrument models.
The alarm relays are set in response to various system or measurement conditions.
You can set your own measurement limits—if the measured oxygen concentration
is outside of these limits, the instrument activates the appropriate alarm relay. See
section 1.4.3 for further description of these alarm outputs.
After-use and storage
If you expect not to use your sensor for more than a few months, you should
clean the sensor, as described in section 1.5, and store it “dry”, without electrolyte,
with the storage cap in place for protection.
1.3.2.1 Warning Messages
The following table shows warning messages that appear on the screen in place of
the oxygen concentration, and their explanation.
Message Explanation
CHECK THE SENSOR The sensor is disconnected.
WARNING
THERMAL CUTOFF
The sample temperature exceeds the set upper limit.
See section 1.4.2.
ATTENTION
HIGH LIMIT
The oxygen concentration lies above the high alarm limit. See
section 1.4.3.
ATTENTION
LOW LIMIT
The oxygen concentration lies below the low alarm limit. See
section 1.4.3.
OVERRANGE *
RANGE 1 through 5 (max.)
The oxygen concentration exceeds the upper limit of the
specified measurement range. See section 1.4.1.
OVERRANGE
RANGE 0
The oxygen concentration exceeds the measurement limit while
in “Autoranging” mode. See section 1.4.1.
* If the “OVERRANGE” message appears, it should be sufficient to press the “ñ” key to reach a
less sensitive range. It may also be necessary to enable access to such ranges by pressing “ESC”,
and then raising the “number of ranges” as described in section 1.4.1.
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