Teledyne 2120XL - Trace Nitrogen Analyzer - Manual (Page 62)

Operation Model 2120XL
Teledyne Analytical Instruments 50
When HOLD is selected, the analog output (4-20 mA) and the
range ID contacts will freeze on their last state before entering one of the
calibration modes. When the instrument returns to the Analyze mode,
either by a successful or an aborted calibration, there will be a three-
minute delay before the analog outputs and the range ID contacts start
tracking again.
The concentration alarms freeze on their last state before entering
calibration regardless of selecting HOLD or TRACK. But, when HOLD
is selected the concentration alarms will remain frozen for the time set in
the Calholdtimer screen after the analyzer returns to the Analyze mode.
See Section 4.5.1.9 Calibration Hold Timer.
4.5.1.9 C ALIBRATION H OLD T IMER (C ALHOLDTIMER )
This function sets the time period for the analog output hold as well
as the time period for which the alarms will be suppressed during a
calibration event.
To set the time period for a hold, press the SYSTEM key to display
the first System menu. Use the ◄►arrow keys to position the blinking
over the More function, and press ENTER. A second screen of system
function will appear. Use the ◄►arrow keys to position the blinking
over the Calholdtimer function, and press ENTER to advance to the
Calholdtimer screen.
Calbrt hold: 1 min
Sample hold: 1 min
The time intervals can be set from 0 (off) to 100 minutes using the
▲/▼ arrow keys. Press ENTER when the desired value is displayed.
The factory default is three minutes, but the delay time is program-
mable. This preference is stored in non-volatile memory so that it is
recovered if power is removed from the instrument.
4.5.1.10 T HE M ODEL S CREEN
The Model screen displays the manufacturer, model, and software
version information for your analyzer.
To view the information in the Model function, press the SYSTEM
key to display the first System menu. Use the ◄►arrow keys to
position the blinking over the More function, and press ENTER. Repeat