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16
Temperature scale
Keypad
In the following example, the target temperature is within .1 degrees of
the actual temperature of the bath so the display indicates a scale on the
bottom line and the actual temperature is shown on this scale with a dark
marker. For target temperatures colder than +10 degrees Celsius, the
COOLING indicator (green LED) on the right side of the front panel will
indicate various intensities and the HEATING indicator (red LED)
will be extinguished. For target temperatures warmer than +10 degrees
Celsius, the COOLING indicator (green LED) on the right side of the
front panel will indicate various intensities and the HEATING indicator
(red LED) will flash on and off with a one second interval.
Figure 8: TE-3000 LCD display when controlling at target temperature
(dark marker at midpoint of scale)
The keypad on the front panel of the TE-3000 (see Figure 8) consists of
fifteen keys - white numbers 0 through 9, a white combination "minus
sign" and "decimal point" key (-/.), a yellow SET TEMP[erature] key, a
yellow CAL[ibrate] TEMP[erature] key, a yellow MENU key, and an
orange ENTER key. The bottom row of five keys (non-numerical keys)
have the capability of being illuminated to assist the operator by indicat-
ing possible key entry choices.
All keypad lights are off during normal operation of the bath. The only
key entry possibilities at this time are the yellow keys. Depression of any
key other than a yellow key will result in a long "beep" to indicate an
improper entry. If any yellow key is depressed, the appropriate instruc-
tions are provided on the LCD and are discussed in later sections of this
manual. If no further action is taken by the operator in any menu or other
screen mode within five minutes, the display will automatically revert
back to the normal (quiescent) display as shown above.
CANNON
®
TE-3000 Thermoelectric Constant Temperature Bath
Version 1.1c — May, 2005; CANNON
2139 High Tech Road • State College, PA 16803 • USA
TEMPERATURE
Actual
Target
-20.003 C
-20.000 C
I
-.1 |...|...|...|...|+.1
®
Instrument Company
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