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Percent Oxygen Analyzer Operation
Teledyne Analytical Instruments 33
range full scale value, and it switches back to the LO range when the
oxygen concentration reaches 85% of the LO range full scale value
Note: The HI Range setpoint MUST be set at a higher
concentration percentage than the LO Range setpoint.
4.3.1 HI Range
Setting the HI Range full scale value defines the LEAST sensitive
analysis range to be used. To set the HI Range:
1. Press the SET HI RANGE function button once.
2. Immediately (within 5 seconds) press either the Δ or ∇ button
to raise or lower the displayed value, as required, until the
display reads the desired full scale percent concentration.
4.3.2 LO Range
Setting the LO Range full scale value defines the MOST sensitive
range to be used. To set the LO Range:
1. Press the SET LO RANGE function button once.
2. Immediately (within 5 seconds) press either the Δ or ∇ button
to raise or lower the displayed value, as required, until the
display reads the desired full scale percent concentration.
4.4 Setting the Alarm Setpoints
The alarm setpoints can be adjusted over the full range of the
analyzer (0-100% oxygen content). They are set as a percent of oxygen
content, so that an alarm set to indicate 9.6 on the display will activate at
9.6% O
2
on any O
2
range.
4.4.1 Set Alarm 1 (HI alarm)
Alarm 1 is preset as a high alarm. To configure this alarm to your
preferences:
1.
Press the SET ALARM 1 function button once.
2.
To change the setting at which the alarm will be actuated, press
the SET ALARM 1 function button once more. The alarm
setpoint will flash on the LED display. Press either the Up or
Down keys to raise or lower the displayed value, as required,