CHAPTER 3 – ANALYZER OPERATION
3.1 System Organization
The Model 1100 has two types of operational modes – User-type, and System-type. User modes
are initiated and controlled by the user, and are used to setup and maintain the analyzer. The
User modes are: Calibration, Set/View Alarm-1, Set/View Alarm-2, View Active Faults, and Setup.
Operating modes are accessed automatically by the Model 1100 during normal operation,
according to its programming, and its configuration parameters. The Operating modes are: Self-
Test & Warm-up, Run, Alarm-1 Active, Alarm-2 Active, and Fault Active.
3.2 USER Modes
At any time, the user can initiate any of the user modes either from the control panel or through the
service port. Control panel access of the Calibration, Set/View Alarm-1, Set/View Alarm-2 and
View Active Faults modes will be covered in this chapter. System setup mode and user access via
the service port will be covered in section 4.1.
The user modes, Calibration, Set/View Alarm-1, Set/View Alarm-2 and View Active Faults, are
accessed serially via the control panel, in the aforementioned order by repeatedly pressing and
releasing the “MODE” key. When a user mode is accessed via the control panel, the model 1100
aborts any system mode active, and holds the state of Alarm-1, Alarm-2, Fault, and Heater OK
relay outputs until the user returns the unit to Run mode.
3.2.1 CALIBRATE Mode & Calibration Procedure
Calibration mode allows the oxygen sensor and the analyzer to be aligned to gases of known
oxygen concentration for the most accurate on-line readings. To maintain the highest accuracy
and performance, the model 1100 requires single-gas calibration with ambient-level oxygen
(20.9%) at system commissioning and at regular monthly intervals during the normal service life of
the oxygen sensor (2-3 years). This simple calibration procedure requires the user to apply the
gas and then adjust the reading on the analyzer control panel. The model 1100 does the rest.
Calibration should be performed at the following times:
• During commissioning
• Once every 30-days of normal operation
• When replacing an oxygen sensor
• As required while troubleshooting the system
Calibration in the field requires only single-gas calibration with ambient-level oxygen (20.9%
oxygen). During the initial factory set-up, two-gas calibration using 20.9% oxygen and 1 to 4%
oxygen is used to properly configure the analyzer and ensure full range accuracy.
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