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Alarm LEDs
Low Alarm LED- In a low alarm condition, the red "LOW
ALARM" LED will flash each second, accompanied by the alarm
beeper.
High Alarm LED- In a high alarm condition, the red "HIGH
ALARM" LED will flash each second, accompanied by the alarm
beeper.
Keyp
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ON/OFF Key- (after Calibration) This key is used to turn the
instrument on or off. When batteries are installed in the unit and
the unit is in the power off mode, the display will be blank. When
the ON/OFF key is pressed once, the unit will start to display the
oxygen concentration and the keypad is activated. If the ON/OFF
key is pressed again, the unit reverts to the power off mode.
LOCK/UNLOCK Key- Pressing the LOCK/UNLOCK key
will unlock the keypad and cause the ”LOCKED" icon to
disappear from the LCD readout. The unit can then be calibrated
and alarm settings can be changed if desired. If no other keys
are pressed within 10 seconds, the "LOCKED" icon will reappear
and the unit will revert to the "LOCKED" mode. When the unit is
in the unlocked state, pressing the LOCK/UNLOCK key will also
cause the "LOCKED" icon to reappear.
CALIBRATE Key- The Unit will force you to Calibrate the
first time power is applied or the sensor is changed. This is
indicated on the LCD by the word “CAL”. Pressing the
CALIBRATE key will allow the ↑ and ↓ arrow keys to calibrate the
unit. Also when the keypad is unlocked, the CALIBRATE key is
used in conjunction with the ↑ and ↓ arrow keys to calibrate the
unit. When the CALIBRATE key is pressed, "CAL" appears on
the LCD readout for 1 second and then the measured calibration
concentration is displayed. The calibration value can then be
changed using the ↑ and ↓ arrow keys. During calibration, the
"%" sign will flash at a once per second rate. When the
calibration value is set, pressing the CALIBRATE or
LOCK/UNLOCK key will cause the unit to exit the calibration
mode and return to normal operation. The unit will also revert to
normal operation if 10 seconds elapse and no keys are pressed.
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