Teledyne 7120 - NDIR analyzer - Manual (Page 56)

Infrared Analyzer Operation 4
4-23 Teledyne Analytical Instruments
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 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.
In the AUTO screen, you are further allowed to select which gas application
(PREVIOUSLY defined in APPLICATION function) to run.
4.6.1 Manual (Select/Define Range) Screen
The Manual range-switching mode allows you to select a single, fixed
analysis range. It then allows you to redefine the upper and lower limits, for the
range.
Use UP/DOWN key to start the RANGE function, and ENTER
Select range
mode: MANUAL