Teledyne 7120 - NDIR analyzer - Manual (Page 55)

4 Operation Model 7120
4-22 Teledyne Analytical Instruments
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: CO2
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.
AL1: 1ØØØ ppm HI
Dft:N Fs:N Ltch:N
Five parameters can be changed on this screen:
• Value of the alarm setpoint, AL1: ####
• Out-of-range direction, HI or LO
• Defeated? Dft:Y/N (Yes/No)
• Failsafe? Fs:Y/N (Yes/No)
• Latching? Ltch:Y/N (Yes/No).
• To define the setpoint, use the UP/DOWN key while screen is
blinking over to AL1: ####. Use the UP/DOWN key to change