Labconco Protector Controlled Atmosphere Glove Boxes 5080102 - Manual (Page 25)

NORMAL OPERATION
26
Glove Box Valves and Gauge (Models 5060000 and 5060100 with Manual Pressure Control)
Positive Pressure Operation (Refer to the diagram below)
With the inner door closed and the glove box “gas in” and “gas out” valves closed (valve
handles horizontal), open the gas supply tank valve. Then slowly open the “gas in” valve and
observe the pressure gauge. When pressure reaches +2 to +3 inches water column, close the valve.
Open the glove box “gas out” valve and turn the vacuum pump switch on to allow the pressure to
reach zero inches water column or atmospheric pressure. Then close the “gas out” valve and
switch the vacuum pump off.
Negative Pressure Operation (Refer to the diagram below)
If the glove box is to be operated under negative pressure and the exhaust is connected to a
vacuum pump, turn the vacuum pump switch on and open the “gas out” valve to reduce glove box
pressure to -2" to -3" water column, then close the “gas out” valve and turn the pump off. Open
the “gas in” valve, allowing the pressure to reach zero inches water column or atmospheric
pressure, then close the gas valve.
NOTE: On Models 5060000 and 5060100, all valves must be left closed when the glove
box is unattended.
Figure 16