Calculating the upstream concentration – Labconco PURICARE Procedure Station Models 34812xx User Manual
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Page 86 of 197
2. Locate the access tube on right side of the rear plenum wall, passing through the
towel catch. As shown in Figure 6-2.
Figure 6-2
3. Pull the tube toward the front of the unit. Remove the access tube cover.
4. Using an appropriate photometer, connect the unit's upstream line to the access
tube.
Note: Keep the photometer sampling tube as short as possible. It should
never exceed 6 feet maximum.
5. Turn on the photometer and allow it to operate for a minimum of 5 minutes.
Leave the valve in the “CLEAR” setting.
6. Check the oil level of the generator – it must be within 1/8” of the level line
when the generator is sitting level.
Calculating the upstream concentration
If you do not want to connect the upstream line of the photometer to the sampling port
located on the supply filter plenum, you must calculate the upstream concentration.
Testing at Labconco has shown the actual concentration varies from the calculated
value. Table 6-1 shows the actual vs. calculated concentrations for the B2 models.
Table 6-1
Supply HEPA Filter Leak Test Specifications
Model 34410
34610
Air Displacement (CFM)
445
665
Laskin Nozzles needed
1
1
Theoretical aerosol conc.
(ug/l)
1
30 20
Actual aerosol conc. (ug/l)
1
15
12
Nominal Speed Control
Setting
74 73
1. The calculated concentration was established by the formula:
Concentration (ug/l) = (# Laskin nozzles @ 20 PSIG x 13,500)/Volume of air displaced
2. Based on Mineral oil
- PURICARE Procedure Station Models 34810xx PURICARE Procedure Station Models 34802xx PURICARE Procedure Station Models 34800xx Type B2 Biosafety Cabinets Models 34610xx Type B2 Biosafety Cabinets Models 34410xx Type A2 Biosafety Cabinets Models 34609 Type A2 Biosafety Cabinets Models 34509 Type A2 Biosafety Cabinets Models 34409 Type A2 Biosafety Cabinets Models 34309 Type A2 Biosafety Cabinets Models 34608xx Type A2 Biosafety Cabinets Models 34508xx Type A2 Biosafety Cabinets Models 34408xx Type A2 Biosafety Cabinets Models 34308xx Type A2 Biosafety Cabinets Models 34600xx Type A2 Biosafety Cabinets Models 34500xx Type A2 Biosafety Cabinets Models 34400xx Type A2 Biosafety Cabinets Models 34300xx