OPERATION OF VRAE
2 - 7
2.3 Power On/Off
To turn on
the VRAE multi gas monitor, press the
[MODE]
key. The audio buzzer will beep once and the display will
show “ON!..” and then “MultiGas Monitor Ver n.nn” to
indicate the software version number. Serial number, current
date and time, temperature of the monitor are displayed next.
The monitor will then go through each sensor socket to
check if a valid sensor is installed. If a new sensor is
installed, a message to remind the user to calibrate the
sensor will be displayed followed by a message that the
alarm limits have been reset to default values for the new
sensor. If a sensor reaches its expected end of life, a
“Warranty Expired” message will be displayed. The sensor
can be used beyond this date if it still calibrates properly and
has enough resolution as tested by the raw readings (see
Section 8 and Technical Note 123).
Next, the monitor displays the preset alarm limits for each
sensor, battery voltage, shut down voltage, user mode, alarm
mode, datalog mode, available data storage memory (in
hours), datalog mode and datalog interval (in seconds). Then
after a warm-up interval (default of 10 seconds), the VRAE
monitor is ready to monitor gases, and the display shows the
instantaneous reading of the gas concentration in ppm.
To turn off
the VRAE multi gas monitor, press and hold the
[MODE]
key for 5 seconds. The monitor will beep once per
second during the power-down sequence with a count down
timer showing the number of remaining seconds. The
message “Off!..” flashes on the LCD display and the display
will go blank, indicating that the monitor is turned off.
