Teledyne 3190 Setting the Alarm Setpoints, Trace Oxygen Analyzer Operation HI Range, LO Range

Trace Oxygen Analyzer Operation 4

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.

4.4Setting 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.

Teledyne Analytical Instruments 4-3