Airflow Instruments IAQ50 - Page 31

the display indicates "SPAN" and the
span concentration.
9. Install the regulator on the span
calibration cylinder and connect tub¬
ing from the regulator to the inlet fit¬
ting on the calibration collar.
10. Use and ^ keys to adjust the
concentration displayed on the IAQ50
to match the concentration on the span
gas cylinder.
11. Press and release the READ key to
take a span gas reading. The IAQ50
starts a 60 second countdown. When
the countdown reaches zero, the in¬
strument returns to the normal meas¬
urement mode.
12. With the gas still connected, observe
the reading on the display. It should
indicate the span gas concentration. If
not, repeat the calibration.
13. If the displayed reading is accurate,
remove the regulator and tubing.
14. Turn the IAQ50 off and flip DIP switch
#7 to OFF (normal mode). The calibra¬
tion is now complete.