Carbon Monoxide Alarm User Manual

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An identification number is added or changed by using
the "+" and "-" keys. Any five digit ID number between 1
and 65,535 may be selected. Select "0" if no ID number
is desired.
5.3.6 Text Only operating mode readout
latch
The "OK latch" indicator means that when the PhD
2
is
operated in the Text Only mode, if the latch is activated
(ON), after an alarm condition has cleared numbers
remain on the screen, rather than the screen returning to
the "OK" message.
Pressing the Alarm button turns the Text Only alarm latch
"ON" or "OFF.
In general, after clearing an alarm, most users prefer to
see the "OK" indicator displayed rather than a numerical
value. This will be the case when the "OK Latch"
indicator is set to "OFF."
5.3.7 "Alarm latch" command
Pressing the Cal button again advances to the "Alarm
latch" screen.
PhD
2
alarms are normally self resetting, that is, as soon
as readings drop below the alarm set point, the alarm
ceases.
It is possible, if desired, to set PhD
2
alarms so that they
"latch." In the latched condition, once an alarm occurs
both visual and audible alarms continue to sound even
after the atmospheric hazard has cleared.
The instrument must be manually reset by pressing the
MODE button. Pressing the MODE button silences the
alarms and restores normal operation.
5.3.8 Security beep
Pressing the Cal button again advances to the "Security
Beep" screen.
The security beep feature allows the PhD
2
to be
programmed to emit an audible alarm "beep" on a regular
basis while the instrument is in operation. This periodic
beep serves as a reminder that the instrument is on.
Use the "+" key to turn the security beep on.
Once the security beep is turned on the screen will show
an additional indicator message (00:00:00) standing for
the hours, minutes, and seconds between beeps. Use the
"+" and "-" keys to set the interval. (Setting the interval on
00:00:00 will turn the security beep back off.)
5.3.9 Exiting the Sensor Configuration
mode
When the PhD
2
is properly configured, press and hold
the Cal key to save the changes. A screen will briefly
announce that changes have been made and the
configuration updated.
Pressing the MODE button will cancel the changes and
save the previous configuration.