Teledyne MX300 manual Setting the Alarms

Operation MX300

calibration. Air calibration should only be used for monitoring oxygen levels between 21% and 40% and should never be used where a high degree of accuracy is needed.

Note: Never calibrate the unit in humidified gas, as water vapor makes the oxygen concentration appear lower than it really is. See Appendix: Humidity.

CAUTION: DO NOT ADJUST THE CALIBRATION SETTINGS IN AIR AFTER THE 100% CALIBRATION, AS THIS WILL CANCEL THE MORE ACCURATE 100% CALIBRATION. THE 100% CALIBRATION MAY BE REPEATED AS MANY TIMES AS DESIRED.

8.Adjust alarm set points to desired level according to the procedures in Section 2.1.4.

9.Press the LOCK/UNLOCK key to hold settings. The unit is now ready for use.

2.1.4Alarms

Note: Before attempting to change the alarms it is necessary to unlock the control keys by pressing the LOCK/UNLOCK key. When pressed the display will start flashing.

To set the alarms on the MX300 monitor (see Figure 2-8):

1.To set the HI alarm: Press the HI ALARM SET key once. Press the UP and DOWN arrow key until the desired value is displayed in the lower right corner of the display.

Note: The HI and LO alarms may be defeated by setting the HI alarm limit one step above 100%. The display will blink ALARM OFF continually in this mode.

2.To set the LO alarm, press the LO ALARM SET key once. Press the UP and DOWN

arrow key to select a value. A built-in safety feature will not allow

Figure 2-8: Setting the Alarms

Teledyne Analytical Instruments 22