Percent Oxygen Analyzer Operation
Teledyne Analytical Instruments 37
4.6.2 Air Calibration
To perform air calibration, make sure you have air flowing through the
same inlet you use for span calibration at a flow of 1- 5 liters per minute. Wait
for readings to stabilize.
Press both the SET ALARM 1 and SET ALARM 2 simultaneously. The
LED display will show “OFSt” for a few seconds. After that the instrument
should read near 20.9%.
The sensor output is expected to be near zero millivolts, if the offset of
the sensor is too high, the analyzer will not calibrate.
4.7 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: TI/AI CONSIDERS THE ACTION OF PRESSING THE
ALARM OR RANGE BUTTONS TO BE AT YOUR (THE
USER’S) DISCRETION AND NOT UNDER
GUARANTEE OF ALARM PROTECTION.
The probe temperature can be displayed momentarily and adjusted
if needed. While the instrument is in normal mode, displaying oxygen
concentration, press the UP and DOWN arrow keys simultaneously. The
red LED display will show the probe temperature in degrees centigrade
for five seconds.