UNI 321 User’s Guide
4
Normal Mode Operation
Turning the Unit On
NOTE: ONCE THE UNIT IS TURNED ON IT CANNOT BE TURNED OFF AND
THE BATTERY LIFE COUNTDOWN TIMER BEGINS.
Press and hold the Right Key
for 3 seconds, until the LCD displays , the buzzer
beeps, and the green LED flashes.
Warm-up Sequence
After powering on, the unit enters a warm up and self-test sequence, showing the firmware
version
followed by the the High Alarm
and Low Alarm
limits. If a sensor is not installed or cannot be identified by the instrument, the screen
flashes between
and
.
Remaining Time Display
After the start-up sequence, the unit enters normal mode and displays the remaining operating
time.
Once the unit is running, it cannot be turned off manually and it stays on until
the battery loses power.
Alarms
Daily Alarm Test (Flashing ?)
Before each day’s use, the ? question mark will be flashing to remind the user to press the
Left [OK↑] Key once to test the function of the audio, visual and vibration alarms.
WARNING: IF ANY OF THE NEEDED ALARMS ARE NOT FUNCTIONING, DO
NOT USE THE INSTRUMENT AND RETURN IT FOR SERVICE.
Normal Alarm Function
If the gas concentration exceeds an alarm limit, the display shows the alarm value being
exceeded
and gives audio, visual and vibration alarms according to the table at the
end of this manual (see Alarm Signal Summary). Once the concentration is no longer in an
alarm condition, the unit reverts back to the time display, but logs the alarm event in memory.
Calibration Fail Alarm
(For Service Use Only)
If the instrument fails calibration, it will alternately display
and the remaining run
time
, once per second. The user can perform a manual Zero Calibration (see below)
on the instrument alone, but a full span calibration requires a Docking Box or CaliCase.
