User guide

Operation Model 2120XL
Teledyne Analytical Instruments 40
 Dig Filt: The Model 2120XL includes a user adjustable
digital filter. The filter has settings 1-10. Setting 1 is the least
amount of filtering and 10 is the highest level of damping.
 Self–Test: The instrument performs a self-diagnostic test to
check the integrity of the power supply, output boards and
amplifiers.
 PSWD: Security can be established by choosing a 5 digit
password (PSWD) from the standard ASCII character set.
(See Installing or Changing a Password, below, for a table of
ASCII characters available.)
 Logout: Logging out prevents an unauthorized tampering
with analyzer settings.
 More: Select and enter More to get a new screen with
additional sub functions listed.
 Auto-Cal: Used to define an automatic calibration sequence
and/or start an Auto-Cal.
 Flow: Used to set the flow through the flow controller.
 TRAK/HLD: The operator sets whether the instrument
analog outputs track the concentration change during
calibration and sets a time delay for the concentration alarms
after calibration
 Cal Hold Timer: Allows alarm suppression and analog
output value hold times during calibration events for a user
adjustable period.
 Model: Displays Manufacturer, Model, and Software
Version of the instrument.
 Out-Cal: Analog output calibration allows the user to
calibrate the 4 and 20 mA analog output values.
 Lin: Used to linearize the output of the controller.
To enter any of the system functions, use the ◄►arrow keys to
move to the function and then use the ENTER key to engage that
function.
4.5.1.1 DIGITAL FILTER
Upon entering the digital filter function, the following screen
appears on the display: