Teledyne 2010B - Split architecture thermal conductivity analyzer - Manual (Page 52)

4 Operation Model 2010B
4-18 Part I Teledyne Analytical Instruments
Use the
∆∆∆∆∆∇
keys to choose between % or ppm units. Then press 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 < > arrow keys to move the
blinking over to AL1: ####. Then use the
∆∇
arrow keys to
change the number. Holding down the key speeds up the
incrementing or decrementing.
• To set the other parameters use the < > arrow keys to move the
blinking over to the desired parameter. Then use the
∆∇
arrow
keys to change the parameter.
• Once the parameters for alarm 1 have been set, press Alarms
again, and repeat this procedure for alarm 2 (AL2).
• To reset a latched alarm, go to
Dft– and then press either ∆
two
times or
∇
two times. (Toggle it to
Y and then back to N.)
–OR –
Go to
Ltch– and then press either ∆
two times or
∇
two times.
(Toggle it to
N and back to Y.)
4.6 The Range Select Function
The Range function allows you to manually select the concentration range
of analysis (
MANUAL), or to select automatic range switching (AUTO).
In the
MANUAL screen, you are further allowed to define the high and low
(concentration) limits of each Range, and select a single, fixed range to run.
CAUTION: If this is a linearized application, the new range must
be within the limits previously programmed using the
System function, if linearization is to apply through-
out the range. Furthermore, if the limits are too small
a part (approx 10 % or less) of the originally linear-
ized range, the linearization will be compromised.