Teledyne 2020 - Explosion proof thermal conductivity analyzer - Manual (Page 52)

4 Operation Model 2020
4-18 Teledyne Analytical Instruments
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, set any one of them
will automatically 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:
—> Ш1 Ш2 Ш3 <—
Set up the Range 1 alarm by moving the blinking over to
01 using the
UP/DOWN arrow keys. Then 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
AL1—PPM AL2—PPM
Use the UP/DOWN keys to choose between % or ppm units. Then
Enter to move to the next screen.