Cannon Instrument CT-2000 (Contant Temperature Bath) - Manual (Page 21)

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CANNON ® CT-2000 Constant Temperature Bath
Revision 1.0g—February, 2012; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
Calibrating the CT-2000
The CT-2000 can be calibrated to any temperature reference standard for
any desired Celsius or Fahrenheit temperature. The controls for entering
the target (desired) temperature and the calibration at this temperature are
convenient and largely intuitive. The instrument stores calibration
corrections for every temperature integer.
Procedure Use the CAL TEMP keypad option to calibrate the CT-2000 to your
ASTM thermometer for a given temperature.
NOTE Before you calibrate, make sure that the bath has stabilized at the
desired test temperature.
1. Set the CT-2000 to the desired test temperature.
2. When the CT-2000 indicates that the instrument is controlling at the
desired temperature, place your thermometer in the bath and wait for
the temperature reading to stabilize (at least 10 minutes).
3. To calibrate, press the CAL TEMP key and enter the thermometer
reading up to three decimal places, subject to the following param-
eters:
a. A decimal point MAY be included as an entry.
b. The entered temperature must be within the operational tempera-
ture range of the bath. If not, a CALIBRATION ERROR will be
displayed on the LCD.
c. The entered actual temperature must not cause a correction in
temperature greater than ± 2.5°C.
NOTE If you make an error while entering a temperature, press the CAL TEMP
key again to cancel the operation, exit the calibration screen and return
to normal CT-2000 operation.
4. When you have completed data entry, press ENTER to store the
calibration data.
5. A new calibration constant has been stored for that test temperature.
6. You may recalibrate for any test temperature at any time.
Calibration theory
The CT-2000 stores user calibration information in a “bin” corresponding
to every temperature integer. This calibration adjustment value for the bin
is effective at all temperature ranges within 0.5 degrees of the tempera-
ture integer.
The CT-2000 combines user calibration input with readings obtained by
the temperature probe and data from the general bath offset, a protected
menu option, which is preset at the factory by CANNON
® Instrument
Company (see the MENU section for more information).