Shellab SCO12WE-2 - Manual (Page 14)

13
Do not use single stage regulators. A two gauge regulator is not necessarily a dual stage
regulator. Insure that you are using a dual stage regulator.
C. It is normal for the high pressure gauge on your regulator to start out reading 800 to 1000
PSI with a full tank. This reading will drop to 500 to 800 PSI quickly and will stay there for
most of the duration of the tank. At the end of use, the pressure will drop quickly to zero,
indicating that the tank is completely empty. Pure CO

is in a liquid state in the new tank
and a constant vapor pressure is generated in the tank above the liquid level, and the CO

is drawn from the top as a gas. This same vapor pressure is maintained as long as any
liquid is left in the tank. When the last of the liquid has evaporated into gas then the
pressure will drop rapidly as the gas is drawn off.
D. Only medical grade CO

should be used in your incubator. The use of a lesser grade may
damage your incubator and void your warranty.
E. The microprocessor CO

control system interprets the information from the CO

sensor,
displays the CO

concentration directly on the digital display, reads the CO

set point, and
controls the percentage of CO

in the incubator chamber.
F. IR sensors operate under the principle that a certain frequency of infrared light is absorbed
by CO

. The more CO

is present the more light is absorbed. Advantages to this system
are that it is only sensitive to CO

, so its accuracy is consistent no matter what the
conditions are in the incubator.
G. Both types of CO

sensors are factory calibrated and under normal circumstances need no
calibration in the fields; however, it is recommended that the accuracy of your CO

control
system be monitored by measuring the actual CO

concentration on a weekly basis with a
FYRITE or other measuring device. This should be done when the chamber has not been
disturbed for an extended period of time, i.e. after the weekend or first thing on Monday
morning.
5.10 Setting the CO

Control: Attach the supply hose to the incubator and turn on the CO

supply. Set
the CO

control to the desired set point using the procedure described in section 5.3.
5.11 Adjusting CO

Display: After the incubator has had several hours to stabilize at CO

set point,
measure the actual CO

% with a Fyrite. If there is any difference between the Fyrite and the display,
use the procedure described in section 5.4 for making the display match the Fyrite.
NOTE: When using the Fyrite, insure that gas is not being injected while the reading is being taken.
Change the CO

set point to 0.0 prior to taking the sample and then change the set point back to the
desired value after the use of the Fyrite.
5.12 Alarm Conditions: The temperature control and the CO

control are both equipped with visual and
audible alarms.
A. Temperature Alarms: The temperature control has alarm indicators for high and low
conditions that are activated whenever the actual temperature is 1C

above or below the set
point.
B. CO

Alarms: The CO

controller has alarm indicators for high and low alarm conditions that
are activated whenever the actual CO

% is 1% above or below the set point.
C. Audible Alarms: Both controls are equipped with audible alarms that are activated when
either of the HIGH or LOW indicators are activated. The audible alarms can be muted for a
single alarm occurrence by pressing and holding down either the UP or DOWN button for
several seconds until the MUTE light comes on. There is a built in delay of 15 minutes on
the occurrence of a LOW alarm. This prevents the audible alarm from activating every time
the door is opened and the temperature and CO2 drops.