Labconco PURICARE Procedure Station Models 34812xx User Manual

Page 19

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Page 19 of 197

Canopy Specifications

8. The 1

st

generation canopy was manufactured from 2007 to mid-2009. It is characterized

by thin slots on both the front and back of the connection, no sealing gasket on
the bottom, and no relief valve on the side wall(s) of the canopy. The canopy

operating specifications are established by measuring the inflow volume of the

Logic, and the total system exhaust volume.

9. The 2

nd

generation canopy was introduced in mid-2009. It is characterized by a single

wide slot on the front of the connection, a black foam sealing gasket on the

bottom, and 1 or 2 relief valve(s) on the side walls of the canopy. The canopy
operating specifications are established by measuring the inflow volume of the

Logic, and the inflow velocity at the slot of the canopy.

10. The average inflow slot velocity of the canopy is measured at the three spots, all on

horizontal centerline of the slot. Test points are located at the vertical center,

and at points 2 inches from each end of the slot.

Logic Filter Life Gauge Operation and Resetting for Local Conditions

The filter life gauge calculates the remaining filter life by measuring and comparing the current

motor speed to the initial speed noted at the factory during assembly, and the calculated

maximum motor speed, using the formula:


100-(100x (current speed-original speed) ) = % filter life left

max. speed-original speed

So

anything

that changes the motor’s current speed, like:

9

Blocking the grille.

9

Raising the air temperature.

9

Lowering the barometric pressure.

will increase the motor’s speed, causing the Filter Life Gauge to decrease. Electronic dampening

of the gauge will limit the change in readings to approximately 1%/minute. Logic Biosafety

Cabinets being installed at altitudes or operating at temperatures significantly different from
those at the time of manufacture (900 +/- 500 ft above sea level, 75

o

+/- 5

o

F)

must

have their

filter life gauge recalibrated for local conditions. Failure to do so will result in the users noticing a

steady drop in Percent (%) Filter Life remaining as the unit operates. Below are the instructions

on how to correct the Filter Life Gauge for local conditions.

1. Ensure to correct all measurement equipment for local conditions (temperature,

absolute pressure). Anemometers may not have this ability and might have to be

done manually; whereas, a ShortRidge

TM

instrument has a setting to correct for

local conditions.

2. As the elevation or the ambient temperature rises, the motor power factor will

have to be reduced to compensate. For an initial certification, the motor speed

should be reduced until it equals the Logic’s “Initial Motor Speed” as reported on
the unit’s test sheet, plus approximately 10-15 RPM per each additional 1000 feet

of elevation.

3. The Logic MUST be recertified, using instruments corrected for local conditions.

4. When the unit is recertified, and operating properly, the certifier MUST RESET

THE FILTER LIFE GAUGE, INDICATING A NEW FILTER HAS BEEN INSTALLED.

5. Only by performing Step #4 AFTER THE UNIT IS READJUSTED AND

RECERTIFIED FOR ITS LOCAL CONDITION, will the filter life gauge register

100% (+/- 2%) during operation. As the Filters then load, the filter life gauge

will then begin to drop as appropriate.

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