29
11.
Regulate the pressure and control the flow rate as described above at 5-30 psig and a 2 SCFH flow rate.
12.
Allow the span gas to flow for 1-2 minutes to purge the air trapped in the span gas line.
13.
Disconnect the sample gas line and install the purged span gas line.
14.
Caution: Allow the span gas to flow and wait until the reading is stable before proceeding with
calibration. The wait time will vary depending on the amount oxygen introduced to the sensor when the gas
lines were switched.
15.
Press the ENTER key to select the SPAN CALIBRATE option.
16.
Note: A span gas concentration above 1000 ppm dictates the selection of the PERCENT option.
17.
Advance the reverse shade cursor using the ARROW keys to highlight the desired GAS CONCENTRATION.
18.
Press the ENTER key to select the highlighted menu option.
GAS CONCENTRATION
PERCENT
PPM
19.
The following displays appear:
00.00 %
PRESS UP OR DOWN
TO CHANGE VALUE
SELECT TO SAVE
ESC TO RETURN
>>>
08.00 %
SPAN
CALIBRATION
ENTER TO CALIBRATE
MENU TO ABORT
20.
Press the UP/ DOWN ARROWS to enter the first digit of the span value.
21.
Press the ENTER key to advance the underline cursor right to the second digit of the span value.
Press the MENU key to advance the underline cursor left to the previous digit.
22.
Press the UP/ DOWN ARROWS to enter the second digit of the span value.
23.
Repeat steps 21 and 22 until the complete span value has been entered.
24.
Allow approximately 60 seconds for the calibration process while the processor determines whether the signal
output or reading has stabilized within 60% of the full scale low range.
