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2.3 Setting Screen
The Setting screen allows users to set or change Date, Time, and warning limit. Use an
arrow and
ENTER
keypads to enter into the Setting screen. Then press the
ENTER
keypad to highlight the parameter that needs to be changed / set. The chosen
parameter will be at the bottom of the window. Press
ENTER
keypad again and using
the keypads scroll through the parameter options or change the number and then press
ENTER
to confirm the parameter’s setting. Press
BACK
keypad to back to the previous
screen.
Figure 5
Setting Screen
Alarm level setting
The user may turn on or off the excess exposure limit warning. The user may input any
value at the increment of 1ppm between 0 and 5000ppm. For your reference, two
levels of limit for carbon monoxide are in common: 1) Threshold Limit Value (TLV) of
5,000 ppm (9,000 mg/m
3
) as a "ceiling limit" established by The National Institute for
Occupational Safety and Health (NIOSH) or American Conference of Governmental
Industrial Hygienists (ACGIH); 2) Permissible Exposure Limit (PEL) of 5,000 ppm
established by US Occupational Safety & Health Administration (OSHA). All of these
concentrations refer to exposures with durations of 8 hr/day, 40 hr/week for a working
lifetime and all are attempts to establish a "no effect" level. The Immediately Dangerous
to Life and Health (IDLH) limit is 40000ppm.
2.4 Calibration
After turning on the instrument, use up or down keypad to go to the Calibration Screen
(Figure 6). Users may calibrate the instrument at his/her own wish after using for a
certain time of period or suspect degradation of sensor performance.
Setting
Date………[2008-09-06]
Time………[ 08:47:25 ]
Alarm………[ OFF ]
