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Thermal Conductivity Analyzer Part I: Control Unit
Part I 4-17
Teledyne Analytical Instruments
• Both high (high and high-high) alarms, or
• One high and one low alarm, or
• Both low (low and low-low) alarms.
2. Are either or both of the alarms to be configured as failsafe?
In failsafe mode, the alarm relay de-energizes in an alarm
condition. For non-failsafe operation, the relay is energized in an
alarm condition. You can set either or both of the concentration
alarms to operate in failsafe or non-failsafe mode.
3. Are either of the alarms to be latching?
In latching mode, once the alarm or alarms trigger, they will
remain in the alarm mode even if process conditions revert back
to non-alarm conditions. This mode requires an alarm to be
recognized before it can be reset. In the non-latching mode, the
alarm status will terminate when process conditions revert to non-
alarm conditions.
4. Are either of the alarms to be defeated?
The defeat alarm mode is incorporated into the alarm circuit so
that maintenance can be performed under conditions which
would normally activate the alarms.
The defeat function can also be used to reset a latched alarm.
(See procedures, below.)
If you are using password protection, you will need to enter your password
to access the alarm functions. Follow the instructions in section 4.3.3 to enter
your password. Once you have clearance to proceed, enter the
Alarm
function.
Note: If all ranges are for the same application, setting one of them
will automaticaly set the others.
Press the
Alarm
button on the front panel to enter the
Alarm
function.
Make sure that 01 is blinking.
Sel rng to set alm:
> Ø 1 Ø 2 Ø 3 <
Set up the Range 1 alarm by moving the blinking over to 01 using the < >
arrow keys. Then press
Enter
. Check the gas application and range limits as
displayed on the screen.
Gas use: H2 N2
Range: 0 10 %
Press enter again to set the alarm setpoints.
Sel %/ppm alm to set
AL1PPM AL2PPM