Shellab SSI10R-2 - Manual (Page 13)

SHEL LAB SI9/SI9R Shaking Incubator Operational Manual
13
Copyright © 2007 Sheldon Manufacturing. All rights reserved.
All specifications and features for this product are subject to change without notice.
To interrupt a timed shaking process

Turn the TIMER switch and the RPM switch to the OFF (O) position.
Note: turning off the timer switch will cause the timer to pause while allowing the shaker to continue running. Turning off
the RPM switch by itself will cause the timer to continue counting down while the shaker is stopped.
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.
Over Temperature Protection, OTP and Safety Temperature
Alarms
The Safety Temperature Alarm is a visual and audible alarm indicator. This feature will not disturb the user’s heating or
cooling process. Its parameters are preset in software and will activate if the process temperature remains 1° or more
below the user’s set point for more than 15 minutes. Alternatively, the Safety Temperature Alarm will activate immediately
if the process temperature exceeds the user’s set point by more than 1°. Either activation will illuminate the Temperature
light and sound an audible alarm. This audible alarm can be muted by pressing and releasing the MUTE button directly
below or adjacent to the Temperature light.
This unit is also equipped with Over Temperature Protection, OTP circuitry. This circuitry is user adjustable and set to an
operating point above the process set point, following the instructions below. This circuitry will over ride the main
temperature controller and assume control in the event the process temperature exceeds the user’s OTP set point.
Setting the Over Temperature Protection, OTP
You can prevent the chamber temperature from inadvertent over- heating by using the unit’s Over-Temperature Protection
(OTP), which consists of:
 A thermostat which is independent of the main temperature control.
 A knob (labeled Set Over 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 OTP indicator light which illuminates if the temperature exceeds the user-defined temperature threshold.
Setting the Over Temperature Protection (OTP) Thermostat
1. For best results, calibrate your unit before you set the OTP 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 twenty-four (24) hours.
3. Using a screw driver or a small coin, turn the OTP knob counterclockwise until the OTP light turns on. This
designates that your OTP has been activated. Note: The OTP light will cycle ON and OFF as the element is trying to
energize on and off.
4. Turn the OTP knob slightly clockwise until the Temp alarm light remains off.
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 OTP thermostat setting, The OTP light will illuminate and the heating element will not raise the
chamber temperature any further. NOTE: This will not produce an audible alarm.
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 and the orbit of rotation.
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 counterweights appear. Remove the wing nuts and add or remove
counterweights according to the total weight of your samples, as shown below.