APPENDIX B - WATLOW
®
SD CONTROLLER
This appendix describes the operating instructions and default controller the Watlow SD
temperature & humidity controllers. An SD controller can be identified by either an “SD” in the
upper right corner or with an upper red/lower green led display.
Actual (red
upper display) SD
Set point (green
lower display) Up
Advance
Infinity
/Home
Down
Temperature is displayed in ºC
Relative Humidity is displayed in %RH
Change Set Point
From the Home screen (setpoint and actual shown as illustrated above), use the up and down
arrow push-buttons to obtain the desired temperature and humidity setpoints.
Change Alarm
From the Home screen, press the Advance button until
A3.hi
appears in the lower display. Using
the Up and Down arrow buttons, adjust the upper display to the desired alarm high setting. Press
the Advance button until
A3.Lo
appears in the lower display. Using the Up and Down arrow
buttons, adjust the upper display to the desired alarm low setting. Press the Infinity key to return
to the home page.
Controller Calibration / Offset
The following procedure outlines the steps for setting a temperature or humidity offset.
D. Press the advance key until CAL1 is in the lower display
E. Press the up or down keys to obtain the desired temperature or humidity offset
F. Press the Infinity key to return to the home page
Controller Parameters
Controller parameters are factory set and should not be changed. Incorrect controller parameters
will result in poor performance and are not covered under warrantee. If parameter re-setting to
factory default values is needed, consult CARON service.
