Teledyne 2020 - Explosion proof thermal conductivity analyzer - Manual (Page 53)

Thermal Conductivity Analyzer Operation 4
4-19 Teledyne Analytical Instruments
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
the number. Holding down the key speeds up the incrementing
or decrementing.
• After the number (value) has been choosed, use Enter to move
the desired parameter. Then use the UP/DOWN keys to change
the parameter.
• Once the parameters for alarm have been set, Enter the alarm
function again, and repeat this procedure for next alarm.
• To reset a latched alarm, go to
Dft– and then use either UP two
times or DOWN two times. (Toggle it to
Y and then back to N.)
–OR –
Go to
Ltch– and then use either UP two times or DOWN 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 throughout the range. Furthermore, if the
limits are too small a part (approx 10 % or less) of
the originally linearized range, the linearization will
be compromised.