Shellab BACTRON600 - Manual (Page 53)

53 | P a g e
USER MAINTENANCE (CONTINUED)
L EAK C HECK
–
E MPTY U NIT
Use this procedure to verify the atmospheric integrity of a BACTRON that is not in use, or that can
be taken out of operation. Read the
Normal Gas Consumption section on page 51 prior to
performing a leak check.
1. Remove the catalyst cartridge from the BACTRON. The catalytic production of water vapor
reduces the volume of atmosphere in the chamber, and will interfere with performing an
accurate leak check.
2. Make sure the BACTRON’s incubator(s) is either off and at room temperature, or heated at
and stabilized at the its application set point. An incubator that is actively heating from
ambient temperature to reach a set point creates increased air pressure in the workstation
from atmospheric thermal expansion.
Note: The unit should be at a steady temperature and atmospheric pressure state when performing
a leak check.
3. Close and secure the outer and inner pass box doors.
4. Verify that manometer is filled up to the refill (top) ring with water.
5. Check that the arm port doors are secure, with the locking bars in the horizontal position,
and the knobs tightened clockwise using wrist strength. Check the door ring seals for signs
of damage or wear.
6. Check that the gas regulator is set to 15 to 20 psi. Open the gas cylinder valve all the way
on if not already opened. Turn the power switch on if the workstation is turned off. Check
that the Chamber Gas light illuminates.
7. The pass box doors light should illuminate, indicating that both doors are closed. If the light
does not activate, check that both doors are sealed.
a. The pass box doors should sit flush against the surrounding body of the
workstation.
b. Check the integrity of the door gaskets. There should be no brittleness or
dryness, and no cracks.
8. Check that the water level of the manometer is pushed down by approximately half an inch
(1 cm). If the manometer is filled, the BACTRON is powered and injecting, and the water
level is not depressed, the system is either not injecting gas or there is a significant leak.
9. If there is a gas leak, the Chamber Gas light will turn on and off frequently. This will be
accompanied by a “clicking” sound t hat is the gas solenoid injecting gas into the chamber.
Record the frequency of injections.
10. If there are no leaks in the system, the Chamber Gas light will remain OFF, and the water
level in the manometer will remain stable at approximately 05. Inches (1 cm) of
displacement.
Procedure continued on next page