UNI MP100 User’s Guide
5
4.
Operation
4.1
Turning the Unit On and Off
Press and hold the Right Key for 3 seconds, until the red light, buzzer, and vibrator all trigger,
followed by the green light, and the LCD displays “On”. To turn off, press and hold the Right
Key from normal display mode for a 5-second count-down, until the unit displays “Off”.
4.2
Warm-up Sequence
After powering on, the unit enters a warm up and self-test sequence, shows the firmware version
as follows:
•
If the sensor cannot be identified or is not installed, the screen alternately displays
and
.
•
If the Bump or Cal Due setting is enabled and the due date has passed, the display will
alternate between
or
and
. The Left Key must be pressed to
acknowledge, otherwise the instrument will turn itself off automatically after 15s.
Lastly, the following values will be shown accordingly:
•
High alarm threshold
•
Low alarm threshold
•
STEL (short-term exposure limit) alarm threshold
•
TWA (8-hour time-weighted average) alarm threshold
4.3
Normal User Mode
4.3.1
Real Time Readings
When warm-up is complete, the unit enters normal mode and starts displaying
instantaneous gas concentrations.
By pressing the Right Key the user can check other values including STEL,TWA, PEAK, MIN
(for O
2
only) and Alarm Log
.
The display returns to real time readings from any other screen if
there is no key action for 60 seconds.
4.3.2
STEL
This displays the Short Term Exposure Limit (STEL) calculation, which is the
average concentration in a moving window over the previous 15 minutes. The
STEL value rises and falls with some lag time over the instantaneous reading.
