Teledyne 3300TB - Low cost trace oxygen analyzer - Manual (Page 27)

Trace Oxygen Analyzer Operation 4
4-3 Teledyne Analytical Instruments
4.3.1 HI Range
Setting the HI Range fullscale 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
∆
or
∇
button to
raise or lower the displayed value, as required, until the display
reads the desired fullscale percent concentration.
4.3.2 LO Range
Setting the LO Range fullscale 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
∆
or
∇
button to
raise or lower the displayed value, as required, until the display
reads the desired fullscale percent concentration.
4.4 Setting the Alarm Setpoints
The alarm setpoints can be adjusted over the full range of the analyzer
(0-9999ppm oxygen content). The set point values are expressed in ppm
only.
4.4.1 Set Alarm 1
Alarm 1 can be set either as a high or low alarm. To configure this
alarm to your preferences:
1. Press the SET ALARM 1 function button once.
2. The display will flash either HI or LO depending on what the
alarm was configured in the last time. If the alarm configuration
must be changed, use the Up or Down keys to toggle the alarm
from HI to LO or viceversa (if within 5 seconds no key is
pressed, the instrument will return to the sample mode and
display oxygen concentration).
3. 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,