Temperature Calibration - Barnstead International MaxQ 4000 Manual

O
PERATION
Note
It is important to press the HEAT
OFF button to exit the calibration
mode.
22

Temperature Calibration

1. Fill a 250-ml Erlenmeyer flask with approximate-
ly 100 ml of water and position it at the approxi-
mate geometric center of the shaking platform.
2. Install a thermocouple inside the flask with the
thermocouple junction in direct contact with the
water.
3. Adjust the safety thermostat to its maximum
clockwise position.
4. Using the up and down keys, adjust the set
point temperature to read 37ºC or any other
desired set point.
5. Allow sufficient time for chamber temperature to
stabilize.
6. Press HEAT ON button and, while continuing to
hold, press and release the HEAT OFF button.
Now, release the HEAT ON button.
7. The decimal point should now be flashing indi-
cating that the unit is in the temperature calibra-
tion mode.
8. Use the up and down arrow keys to adjust the
temperature on LED readout to match the tem-
perature reading on the thermocouple meter.
9. Press the HEAT OFF button. The beeper will
sound indicating that the new calibration value
you have entered is now stored in the non-
volatile memory of the temperature controller.
10. Press HEAT ON button twice to complete return
to normal operating mode.