Hybex
®
Microsample Incubator — USER MANUAL
Version 1.
9
, Oct 2019 12 (408) 733-7337, [email protected]
VIII.
APPENDIX A – Using and Calibrating a Watlow SD31 Controller
** For selected Hybex incubators manufactured between 2005 and 2010.**
A.
Using the Watlow SD31 Temperature Controller
The controller has a single LED panel with four buttons. The set
temperature is displayed if the
SET
key is pressed and held otherwise the
ACTUAL
block temperature is displayed.
To set the block temperature:
1.
Hold in the
SET
button to view the previous set temperature.
2.
While holding down the
SET
button, press the up or down arrow button until the
desired set temperature is shown.
3.
Release the buttons to display the actual temperature. The instrument will adjust
block heating until the new temperature is attained.
B.
Calibrating the Watlow SD31 Temperature Controller
Re-calibrating the Hybex temperature controller is recommended
only if
the display varies
by more than one degree (1°C) to a connected NIST-certified T-type digital thermometer
(SciGene cat. #1051-52-0).
To adjust the controller to achieve accurate temperatures:
1.
Insert a block into the Hybex incubator, turn ON the instrument and set the
controller to 65°C. Allow 15 minutes to stabilize.
2.
Using the cable provided with the digital thermometer (cat. #1051-52-0), plug one
end into the blue receptacle found on the back panel of the Hybex incubator and
the other end into the digital thermometer.
3.
Turn on the thermometer. Allow 1 minute for thermometer to stabilize. The actual
temperature of the block will be displayed.
4.
Calculate the difference in the temperature shown on the controller and the digital
thermometer. For example, if the controller displays 52.5°C and the digital
thermometer displays 51.0°C, the difference (offset) is 1.5°C.
5.
On the temperature controller, press the Infinity Key (
∞
) for
three seconds until “OPEN” appears.
6.
Press the down arrow four times until “Cal” appears.
7.
Press and hold the SET key. The existing offset value between
the controller and digital thermometer is displayed.
8.
Press and hold the SET key and use the up/down arrows to
adjust the offset value to the temperature dHeaifference calculated in Step 4. For
example, if the controller shows a temperature 1.5°C lower than the thermometer,
adjust the offset by adding 1.5 to the value shown.
9.
Press the Infinity Key (
∞
) to exit calibra on and return to the opera on display.
Verify that the temperature on the thermometer matches the display. Your
incubator is now calibrated to provide accurate temperatures between 35 and 99°C.