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CD Readout
3
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/2-Digit Display- The 3
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/2-digit liquid crystal display (LCD)
provides direct readout of oxygen concentrations in the range of
0-100%. It also displays "CAL" when the calibration mode is
entered.
"%" Sign- The "%" sign is present during normal operation
when the keypad settings are locked. When the keypad settings
are unlocked, the "%" sign is not visible. In the calibration mode,
the "%" sign flashes every second.
Low Battery Indicator- The low battery indicator appears on
the LCD display when the power supply voltage drops below
acceptable limits. When the "LOW BAT" icon is visible, batteries
should be replaced immediately.
Keyp
ad
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- The presence of the "%" sign on the LCD
readout is an indication that the unit is in its normal
"LOCKED" state. The unit must be unlocked in order to
be calibrated. Pressing the LOCK key will unlock the keypad and
cause the "%" sign to disappear. The unit can then be calibrated
if desired. If no other keys are pressed within 10 seconds, the
"%" sign will reappear and the unit will revert to the "LOCKED"
mode.
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
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1.2 Components Description (please refer to page 3)
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