Lake Shore Model 218 Temperature Monitor User’s Manual
4-4
Operation
4.2.1 General Keypad Operation
There are three basic keypad operations: Direct Operation, Setting Selection, and Data Entry.
Direct Operation
is where the key function occurs as soon as the key is pressed. Log On/Off, Local
and Alarm Reset operate directly when the key is pressed.
Setting Selection
allows the user to select from a list of values. During a selection sequence the
Data Selection keys are used to select a parameter value. After a selection is made the Enter key is
pressed to make the change and advance to the next setting,
Escape
is pressed to return to the
Normal display. The instrument retains values changed prior to pressing
Escape
. Some selections
are made immediately after pressing a function key like Interface. Most are part of a string of settings
that often begins by entering an input number.
Data Entry
expects the user to enter number data using the data entry keys. Data entry keys include
the numbers 0-9, +/– and decimal point. Alarm setpoints are an example of parameters that require
data entry. During a data entry sequence use the data entry keys to enter the number value, press
the Enter key to accept the new data and advance to the next setting. Press
Escape
once to clear the
entry, twice to return to the Normal display. The instrument retains values changed prior to pressing
Escape
twice. Most data entry operations are combined with other settings and grouped under a
function key. Temperature or sensor unit parameters have the same setting resolution as the display
resolution for their corresponding readings.
4.3 TURNING POWER ON
After verifying line voltage (Paragraph 3.3), plug the instrument end of the line cord (included with the
connector kit) into the power and fuse assembly receptacle on the instrument rear. Plug the opposite
end of the line cord into a properly grounded, three-prong receptacle. Flip power switch, located next to
the line cord receptacle, to the On (
I
) position. The instrument initiates the following power up
sequence: the instrument alarm sounds once; the display shows a startup message, then clears; the
normal reading display appears. If the instrument does not complete the sequence or if a general error
message displays, there may be a problem with the line power or the instrument. Individual messages
in a reading location normally indicate that input setup is required.
4.4 DISPLAY
SETUP
The Model 218 has a 4-line by 20-character backlit LCD. During normal operation it is divided into eight
reading locations. Each of the eight reading locations can be configured by the user with the Display
Format feature. Data from a sensor input can be displayed in any location. Sensor readings can be
displayed in temperature or sensor units. Results of the math feature can be displayed at the same time
as live readings. The reading location indicates the number of the sensor input to the left of the reading
value. The character to the right of the reading value indicates units for live readings or shows an
annunciator for one of the math values. The column of characters on the far right side of the display are
used for system annunciators. See Figure 4-2. During keypad operation, the display format changes to
prompt for data entry. Reading locations numbered 1-8 correlate to the sensor input numbers shown in
Figure 4-2.
To configure the display, press
Display Format
. The first display of the setting sequence, shown to the
right, appears. Use the Data Selection keys to cycle through display locations (1–8). Press
Enter
when
the desired location appears. The second display in the setting sequence appears.
