Shellab SCO31 - Manual (Page 19)

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CONTROL PANEL OVERVIEW (CONTINUED)
Over Temperature Limit Thermostat (OTL)
This control is marked SET OVER TEMPERATURE or Set Over Temp Safety and is equipped with
a graduated dial. The OTL is a mechanical backup system that operates independently of the
digital temperature controller. It guards against a failure of the digital controller that would allow the
chamber temperature to rise past the controller set point. Please see the
Over Temperature Limit
System description in the Theory of Operations section (page 21) for a more complete explanation.
OTL Light
The red pilot light marked OVER TEMPERATURE ACTIVATED or Over Temp Safety Activated
illuminates when the Over Temperature Limit system takes control of the incubator. It do so by
overriding the controller board through depowering the heating element. Under normal operating
conditions this pilot lamp should never turn on.
CO
2
Control and Display Panel
Labeled SET CO
2,
this panel includes a green digital LED display connected to an infrared sensor,
which shows the concentration of CO
2
in the incubaion chamber as a percentage of the chamber
atmosphere. The UP / DOWN arrow pad is used to input a CO
2
concentration level set point for the
chamber, and to enter calibration corrections. Red LED indicator lights marked HIGH and LOW
illuminate whenever an alarm condition associated with the chamber CO
2
level is reached. The
yellow LED marked MUTE illuminates whenever an audible alarm is being muted.
CO
2
Injection Light
Marked CO
2
INJECTING, this pilot light illuminates during injections of CO
2
into the incubation
chamber air stream.
Circuit Breaker
Each SCO Incubator comes equipped with a circuit breaker located adjacent to the power inlet. If
the breaker trips, set the unit power switch to off, and locate a cause for the overcurrent condition
before resetting the breaker. The circuit breaker in the SCO58 and SCO40 is a 20 amp breaker. In
the SCO31 it is a 15 amp breaker.