Teledyne 3300TB - Low cost trace oxygen analyzer - Manual (Page 28)

4 Operation Model 3300 TB
4-4 Teledyne Analytical Instruments
until the display reads the desired percent concentration. (if
within 5 seconds no key is pressed, the instrument will return to
the sample mode and display oxygen concentration).
After setting the value wait for the unit to time out of this mode (ap-
proximately 5 seconds) and return to displaying oxygen concentration.
4.4.2 Set Alarm 2
Alarm 2 can be set either as a high or low alarm. To configure this
alarm to your preferences:
1. Press the SET ALARM 2 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 2 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,
until the display reads the desired percent concentration. (if
within 5 seconds no key is pressed, the instrument will return to
the sample mode and display oxygen concentration)
After setting the value wait for the unit to time out of this mode (ap-
proximately 5 seconds) and return to displaying oxygen concentration.
4.4.3 Sensor Fail Alarm
The SENSOR FAIL alarm triggers if, during calibration, the raw cell
output for the given oxygen level is too low. (See Calibration Characteris-
tics in Chapter 2.). Should this alarm trigger, the ALARM indicator below
the SET function buttons will start blinking. Replace the cell before pro-
ceeding.