Teledyne OT-3 - Manual (Page 37)

Trace Oxygen Analyzer Operation
Teledyne Analytical Instruments 29
Note: If the analyzer output goes above the high alarm setpoint
or below the low alarm setpoint, the display will go blank
and the front panel ALARM Indicator, beneath the SET
Function buttons, will blink. Hold down the SPAN button
until the ALARM Indicator stops blinking.
To set the span:
1. Press the SPAN button once.
2. Within 5 seconds press either the ∆ or ∇ button until the display
is stable and matches the known span gas concentration.
The unit is now calibrated.
4.9 Displaying Percent & PPM on the LED Display
The analyzer displays the concentration in percent whenever the
reading is over 9999 ppm. When the reading changes to percent, the
LED display will flash the oxygen concentration on and off. On the
other hand, if the instrument is displaying ppm, only the concentration
reading will be shown.
4.10 Supplementary Information
If, during the Span Procedure, you pressed the SPAN button by
mistake, you must wait five minutes for the analyzer to resume analysis
or you can press the UP button and then the DOWN button. (Pressing
the UP and DOWN buttons causes the analyzer to time-out in five
seconds instead of five minutes).
If during the span procedure, you press the RANGE or ALARM
buttons:
- either the range or alarm routine will be activated.
- any changes to span will be rejected.
- the 60 second alarm delay will not occur, i.e., the alarms will
be responsive immediately.
CAUTION: TET/AI CONSIDERS THE ACTION OF PRESSING THE
ALARM OR RANGE BUTTONS TO BE AT YOUR
(THE USER’S) DISCRETION.
BE AWARE THAT THE ALARMS WILL BECOME
ACTIVE WITHIN 5 (FIVE) SECONDS IF THE RANGE