Shellab SWBR27-2 - Manual (Page 11)

Reciprocating Water Bath 11
Calibrating the Main Temperature Control
We recommend that you calibrate your unit once it has been installed in its working environment and the
chamber temperature has been stable at the set point for several hours.
1. Place a calibrated reference thermometer in the bath (a thermometer clip is provided with the
accessories package). Allow the thermometer to reach temperature and remain stable for one (1)
hour.
2. Compare the reading on the reference thermometer with the temperature control display. If there is a
difference, put the display into calibrate mode by pressing both the UP and DOWN arrow pads at the
same time until the two (2) outside decimal points begin to blink.
3. When the decimal points are blinking, press the UP or DOWN arrow pad to adjust the display to
match the reference thermometer. If the arrow pads are not pressed within five (5) seconds the
display will revert to showing the temperature within the bath.
4. Allow the unit to stabilize again, and repeat calibration if necessary.
Setting the Over Temperature Safety Thermostat
To set the Over Temperature Safety Thermostat, perform the following steps:
1. Verify that the Safety Thermostat was set to its maximum position to allow the water bath to stabilize.
2. Turn the Safety Thermostat counterclockwise until the Safety indicator light turns on.
3. Turn the Safety Thermostat clockwise until the Safety indicator light turns off.
4. Turn the thermostat clockwise again, two of the smallest divisions on its scale past the point where the
indicator light went out. This will set the Safety Thermostat at approximately 1

C above the Main
Temperature set point.
Setting Oscillation Control
The oscillation switch DOES NOT need to be ON to adjust oscillation set point (see
Oscillation
Controller
). To enter the set point mode on the control, push and release either the UP or DOWN
arrow pad one time and the display will start to blink on and off.
While blinking, the digital display is showing the RPM (Rotations Per Minute) set point, which can be
changed by pushing the UP and DOWN arrow pads. The range for this set point is 20 - 200 RPM. If the
arrow pads are not pressed for five (5) seconds, the display will stop blinking and revert to its original RPM
value.
Setting Samples in Place
With the bath temperatures and oscillation set points adjusted, the unit is ready for operation.
1. Place samples on the oscillation rack as desired.
2. If you are using flask clamps on your oscillation rack, remove the rack and place samples in clamps
then put the rack back in place (see Oscillation Rack).
3. Put the bath cover in place if desired and turn the oscillation switch to the ON position.