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 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 concentration.
4.3.3 Settle Mode
The Model 3190 has two programmable ranges as discussed previous.
Occasionally, to maximize accuracy the microprocessor must make certain
adjustments to the gain of the amplifier which converts the sensor current
into a voltage. When these adjustments are being made, the outputs of the
analyzer are frozen and the LED will flash “SetL”. This condition will
persist for approximately 35 seconds and then normal operation will resume.
4.4 Setting the Alarm Setpoints
The alarm setpoints can be adjusted over the full range of the analyzer
(0-9,999 ppm oxygen content). The setpoint values are expressed in ppm
only.
Note: For proper operation, the HI Alarm setpoint should be set at a
higher concentration than the LO Alarm setpoint.
4.4.1 HI Alarm
Setting the HI Alarm sets the value ABOVE which the HI Alarm will
activate. To Set the HI Alarm:
1. Press the SET HI ALARM Function button once.