Chemglass CLS-3959 - Manual (Page 2)

Using and Setting the Timer (cont.)
Press the Mode button to illuminate the Timer Set Mode lamp and place the dry bath into the timer set mode. Use the Up and
Down arrow buttons to set the desired time in one minute increments on the display. Once time has been set and after about 3
seconds, the dry bath will make a “beep” sound and automatically begin the timer. The display will revert to showing the block
temperature and the red Timer Set Mode lamp will be extinguished. When the display shows the block temperature, pressing the
Mode button will cause the display to show how much time remains on the timer in minutes.
When time has expired, the dry bath will briefly sound the “beeping” alarm and flash the red Heating lamp. The display will show a
set of characters that represent the word “oVEr”. Sample heating will be unaffected. At this point the user can press the Mode
button to start the timed cycle over again or press the Down arrow button to cause the display to show the current block temperature
without re-starting the timer.
It is best to allow the dry bath to first reach the desired temperature before setting and using the timer function. Because the timer
does not affect sample heating, it can only be used as a general purpose timer including timing of other lab activities. The timer
setting is automatically remembered if unit power is turned off or if power is lost.
User Calibration Function
The dry baths are calibrated at the factory and are highly accurate. The dry baths also have a user calibration feature which allows
users to fine adjust the dry bath display to match certified lab reference thermometers or reference temperature sensing meters.
Adjusting unit calibration should only be attempted using certified thermometers or temperature sensors with accuracy certificates.
Use the following procedure to calibrate the dry bath:
1, The unit must be off. Press and hold down the Mode button. While holding down the Mode
button, turn the unit on using the power switch at the back.
2. The display will step through the digits and then show the current temperature setting with the
right hand digit flashing. Release the Mode button after the right hand digit begins flashing.
3. Set the temperature to the desired calibration temperature using the Up and Down buttons.
4. Press and release the Mode button. The unit will start heating to the set calibration temperature.
5. Allow 45 minutes for the dry bath to equilibrate at the set calibration temperature. The right hand
digit will begin flashing again when the dry bath has equilibrated at the calibration temperature.
7. After the display begins flashing, use a certified reference thermometer or temperature sensor to
check the block or sample temperature. If the reference thermometer shows a difference from the
display, you can adjust the display to match the thermometer by using the Up and Down buttons.
8. After using the reference thermometer and adjusting the display if necessary, press the Mode
button to exit the calibration mode. The dry bath will then be calibrated to the reference
thermometer at the selected temperature point and ready for operation.
ERR Code on the display
If the dry bath temperature sensor is shorted or senses an ambient temperature below 0C, the display will show the error code ERR.
Warranty: The dry bath comes with a 2-year warranty.
Phone: 1-800-843-1794 Fax: 1-800-922-4361
Rev. 8-10