20 3600 Analyzer for O
2
Measurement—Operator’s Manual
3600O2.OM.E9903
1.4.2 Thermal Cutoff
If the sample temperature could exceed the compensated temperature range of the
sensor, you can set an upper temperature limit to automatically cut off the
electrical signal to the sensor to extend the life of the sensor. (As an example, for
steam cycle operation, you may want to set the cutoff for 40.0° C.)
Under the “Modify Options” menu, highlight “Thermal Cutoff” using the “ñ” or
“ò” arrow keys, and then press “ENTER” to display this screen:
THERMAL CUTOFF
DISABLED ENABLED
Highlight “Enabled” to display:
THERMAL 000.0
CUTOFF ^
Note that the menu highlights an individual digit. This means you must press “ñ”
or “ò” to increment or decrement this digit; then press “ENTER” to move to the
next digit. After pressing “ENTER” a fourth time to enter all the digits, the
instrument returns to the “Modify Options” menu. Once this is set, if the sample
temperature exceeds your limit, the outputs drop to their lowest value and a
“WARNING THERMAL CUTOFF” message appears on the display.
1.4.3 Alarm Outputs
The Alarms menus configure the instrument’s internal relays for alarm outputs.
The alarms configuration (High/Low, High/High, or General) determines the
manner in which these relays respond to various conditions. For High/Low and
High/High configurations, separate measurement limits can be set—if the
measured oxygen concentration is outside of these limits the instrument activates
the appropriate alarm relay (see section 1.4.3.1 for description of the alarm relay
responses).
To select the alarms configuration, under the “Modify Options” menu, highlight
“Alarms” using the “ñ” or “ò” arrow keys, and then press “ENTER”:
CONFIGURE ALARMS
HIGH/LOW
This menu also includes the choices “High/High” and “General”. Use the arrow
keys to highlight your choice, and then press “ENTER” to set that configuration.
Note that whenever you select a configuration from this menu, the other two
configurations are cleared from the instrument, and are no longer active.
For the “General” selection, the next menu allows you to enable or disable the
general alarms:
HIGH/LOW ALARM
DISABLED ENABLED
Highlight “Enabled” and press “ENTER” to enable the general alarms, then the
instrument returns to the “Modify Options” menu. (Measurement limit alarms are
not available in this configuration.)
For the “High/Low” selection, you see a menu like the following to set the
measurement limits for this configuration:
HIGH 0000
LIMIT ^
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