Specifications
33
4. Although CO
2
is non-toxic, it can cause asphyxiation if not used in areas
with adequate ventilation. The Model 518 Chamber is equipped with a
Chamber Vent (1” White Hose Barb located in the middle of the Black
Panel on the right side of the Chamber). The spent CO
2
gas will escape
from the Chamber Vent and dissipate into the room atmosphere. To vent
the gas outside of the room or building, connect an appropriate length of
1” ID tubing to the Vent Hose Barb. The open end of the tubing should be
exhausted outside the working environment.
5. Connect the Transfer Hose to the CO
2
Tank and Valve.
A. Connect the Female Quick Disconnect fitting to the Male Quick
Disconnect fitting. Pull back on the collar of the female fitting and
place it onto the male fitting, release the collar. These fittings should
mate to form a leak-free seal.
B. Connect the other end of the transfer hose (Large Brass Fitting) to the
CO
2
Cylinder. Tighten the fitting onto the tank using a wrench.
4.2.1.3 Operation
The user does not have to do anything else to operate the system. Total
operation will be under the control of the microprocessor temperature
controller.
The temperature controller is a PID microprocessor with a time proportioned
AC voltage output. Refer to Section 5.2, Microprocessor Temperature
Controller Operation, for a full description of operation.
The user should periodically monitor the status of the CO
2
cylinder. The user
should also periodically monitor the cooling performance of the system to
check for an exhausted CO
2
tank.
4.2.1.4 Changing CO
2
Tank
Before disconnecting any fittings or attempting to change the tank, all of the
CO
2
must be vented from the system. Venting the CO
2
will relieve any
pressure in the system. Failure to bleed the system may result in injury!!
To bleed the pressure from the line:
1. Turn “ON” the Cooling Valve. Turn on the “TEMP” STANDBY switch on
the front panel and adjust the set-point several degrees below the
temperature inside the chamber. Wait for the Cool Valve to turn “ON”.
2. While the Cool Valve is open, turn off the manual valve on top of the CO
2
tank. This will shut off the CO
2
supply to the system