Shellab 74200-720 - Manual (Page 9)

Microprocessor Control Bead Baths 9
OPERATION
Filling with Lab Armor Beads and Turning on the Unit
To turn on the unit, perform the following steps:
1. Check power supply against unit serial plate; they must match.
2. Plug service cord into the electrical outlet. If supplied with a detachable cordset, plug the female end
into the unit inlet and the male plug into the power supply. Verify that units requiring a fuse have the
fuse installed in the power inlet.
3. Fill the bath with a minimum of three-fourths (3/4) volume with Lab Armor ™ Beads. Do not use
liquids in Bead Bath tank.
4. Push the Main power switch to the ON position and turn the Over Temperature Safety Thermostat to
its maximum position, clockwise.
Setting Main Temperature Control
To enter set point mode on the control, push and release either the Up or Down arrow pad one time and
the digital display will start to blink from bright to dim. While blinking, the digital display shows the set
point that can be changed using the UP or DOWN arrow pads. If the arrow pads are not pressed for five
(5) seconds, the display will stop blinking and will revert to reading the actual temperature in the bath.
Allow at least twelve (12) hours for the temperature to stabilize.
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 into a vessel filled with 25 ml or more of water. Place the
vessel and thermometer into the center of the bath. 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
display flashed “CO” and then blinks the temperature.
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 for one (1) hour and repeat calibration if necessary.
Setting the Over Temperature Thermostat
To set the Over Temperature Thermostat, perform the following steps:
1. Verify that the Thermostat was set to its maximum position to allow the Bead Bath ™ to stabilize.
2. Turn the Thermostat counterclockwise until the Safety indicator light turns on.
3. Turn the Thermostat clockwise until the Safety indicator light turns off.
4. Turn the thermostat clockwise again, 1/16” past the point where the indicator light went out. This will
set the Thermostat at approximately 1

C above the Main Temperature set point.
Thaw Zone
For optimal thawing, use the “Thaw Zone”. This zone is located at the rear, left-hand corner when viewing
the unit from the front Control Panel.
Section
6