Shellab SSI5R-2 - Manual (Page 12)

SHEL LAB SI6/SI6R Shaking Incubator Operational Manual
12
Using the Timer
Using the incubator’s timer, you can run the shaker
platform at a preset RPM for a preset time. The timer
can be set at intervals of one (1) minute up to a
maximum of a 999 (16 hours 39 minutes).
Upon completion of the timing cycle, the TIMER alarm
LIGHT will turn ON and an alarm will sound.
You can interrupt the timer if you need to access the
shaking platform before the timer completes.
To start a timed shaking process
1. Turn the TIMER switch to the ON (I) position.
2. Press the set timer up or down arrow key once.
The display starts to blink off and on and shows
the current set time. Press the up or down arrow
to select the desired time.
Approximately five seconds after you release the Up or
Down arrow keys, the display stops flashing and the
timing interval begins.
To interrupt a timed shaking process

Turn the TIMER switch and the RPM switch
to the OFF (O) position.
CAUTION
Wait for the mechanism to come to a complete stop
before entering the chamber.
To restart an interrupted timed shaking
process

Turn the RPM and TIMER switch to the ON (I)
position.
Setting the Safety
Temperature Alarm
You can prevent the chamber temperature from
inadvertent over-
heating by using the unit’s Over-
Temperature Protection (OTP), which consists of:

a thermostat independent of the main temperature
control.
 a knob, marked Safety Temp, to set the safety
temperature threshold. The numbered scale
around the knob is for reference only and does not
correspond to any temperature points.

an alarm, marked Temp, that sounds if the
temperature
exceeds the user-defined
temperature threshold.
To set the safety temperature thermostat
1. For best results, calibrate your unit before you set
the safety thermostat.
See “Calibrating the Main Temperature Control” on
page 11.
2. Be sure the temperature within the chamber has
stabilized at the set point for several hours.
3. Using a screw driver or a small coin, turn the
Safety Temp knob counterclockwise until the
Temp alarm light turns on and off, which
designates that your OTP has been activated.
The light will cycle on and off as the element is
trying to energize on and off.
4. Turn the Safety Temp knob slightly clockwise until
the Temp alarm light turns off.
NOTE: Temp Alarm will only sound off when
temp overshoot 1°C from setpoint.
The OTP is now set at approximately 1

C above the
main temperature set point. If, for any reason, the
chamber temperature rises to the safety thermostat
setting, the Temp alarm will go off and the heating
element will not raise the chamber temperature any
further.
Adding or Removing
Counterweights
To allow the smoothest operation of the shaker, you
should adjust the number of counterweights used
based on the weight of the load.
To add or remove counterweights
1. Unplug the unit from its power source. When the
shaker mechanism comes to a complete halt,
remove the sample tray.
2. Rotate the counterweight platform until the
counterweight appears. Remove the wing nuts
and add or remove counterweights according to
the total weight of your samples, as shown below.
Total Sample
Weight
Number of
Counterweights
Up to 2.3 kg (5 lbs.) 2
Up to 4.5 kg (10 lbs.) 3
Up to 6.8 kg (15 lbs.) 4
Up to 9 kg (20 lbs.) 5
Up to 11.3 kg (25 lbs.) 6
3. Replace the wingnuts and sample tray.