Teledyne 2000A-EU - General purpose thermal conductivity analyzer - Manual (Page 40)

4 Operation Model 2000A-EU
4-2 Teledyne Analytical Instruments
The Enter button is used to accept any new entries on the VFD screen.
The Escape button is used to abort any new entries on the VFD screen that are
not yet accepted by use of the Enter button.
Figure 4-1 shows the hierarchy of functions available to the operator via the
function buttons. The six function buttons on the analyzer are:
• Analyze. This is the normal operating mode. The analyzer
monitors the thermal conductivity of the sample, displays the
percent or parts-per-million of target gas or contamination, and
warns of any alarm conditions.
• System. The system function consists of nine subfunctions.
Four of these are for ordinary setup and operation:
• Setup an Auto-Cal
• Assign Passwords
• Log out to secure system
• Initiate a Self-Test
Three of the subfunctions do auxiliary tasks:
• Checking model and software version
• Adjust LCD screen contrast
• Display more subfunctions
Two of these are for programming/reprogramming the analyzer:
• Define gas applications and ranges (Refer to programming
section, or contact factory.)
• Use the Curve Algorithm to linearize output. (Refer to
programming section, or contact factory.)
• Zero . Used to set up a zero calibration.
• Span. Used to set up a span calibration.
• Alarms. Used to set the alarm setpoints and determine whether
each alarm will be active or defeated, HI or LO acting, latching,
and/or failsafe.
• Range. Used to set up three analysis ranges that can be
switched automatically with autoranging or used as individual
fixed ranges.
Any function can be selected at any time by pressing the appropriate button
(unless password restrictions apply). The order as presented in this manual is
appropriate for an initial setup.
Each of these functions is described in greater detail in the following proce-
dures. The VFD screen text that accompanies each operation is reproduced, at
Contrast Function is DISABLED
(Refer to Section 1.6)