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4.2.2 Viewing current or restoring the
factory default alarm settings
PhD Ultra alarm settings are set very conservatively
at the factory. (
See Appendix B.
) Factory default
settings may be restored at any time while the
instrument is being operated in either Basic or
Technician operating mode by doing the following:
(1) Turn the instrument on. Verify that the
instrument is in Basic or Technician operating
mode. Switch modes (if necessary) by
simultaneously holding down the "+" and"-"
keys. Each time that the operating mode is
changed, the LCD screen will briefly indicate the
current operating mode.
(2) Press the "ALM" button on the instrument key-
pad. The display will briefly show the following
screens:
These screens will be followed by two message
screens that will cycle back and forth.
4.2.2.1 Viewing current alarm settings
(1) Perform steps 1 and 2 above in section 4.2.2.
(2) Press “-” to view the current alarm settings. A
screen will show the message “Current Alarm
Settings”. This screen will be followed by
screens showing the specific alarm settings for
each sensor that is currently recognized. These
screens will be shown in continuous rotation. In
the case of a PhD Ultra with combustible,
oxygen, carbon monoxide, and hydrogen sulfide
sensors installed, the following sequence of
screens would be shown:
Oxygen and combustible gas (LEL):
The ceiling alarm set-points for the toxic sensors
currently installed:
The STEL and TWA alarm set points for the toxic
sensor currently installed in toxic sensor position 1:
The STEL and TWA alarm set points for the toxic
sensor currently installed in toxic sensor position 2:
The final screen in the sequence shows the
message “Mode = Cancel”. Pressing the mode
button at any time returns the PhD Ultra to normal
operation.
4.2.2.2 Viewing or restoring factory default
alarm settings
(1) Perform steps 1 and 2 above in section 4.2.2.
(2) Press “+” to view the factory default alarm
settings for the sensors currently installed. A
screen will show the message “Default Alarm
Settings”. This screen will be followed by
several more showing the specific alarm
settings for each type of sensor currently
installed.
Etc.
The final screen in the sequence shows the
message “Alarm = Defaults, Mode = Cancel”.
These screens will be shown in continuous
rotation.
(3) Press the "ALM" button to restore the default
alarms. The following screen will be shown:
(4) If the mode button is pushed, the current alarm
settings will remain unchanged, and the display
will show the following screen:
(5) After selection of the default or current alarm
settings has been made, the PhD Ultra will
return to normal operation and the display will
revert to the current gas reading screen.
4.3 Instrument
setup
The following options are controlled through the
Instrument Setup mode:
