Heraeus HS 12 - Page 70

Service Instructions HERAsafe HS/12/18
Valid: 05.2001 / 50060091 / A • 41 •
B Field tests
B2 Suppliers of testing equipment, description of test terms
Testing equipment Manufacturer Application
Smoke tubes MSA
Pittsburgh
Pennsylvania, 15230
Airflow pattern test
Thermoanemometer TSI
Shoreview, Minnesota 55126
Downflow velocity test
Anemometer TSI
Shoreview, Minnesota 55126
Inflow velocity test
DIM (Direct Inflow Measurement)
Shortridge Instruments Inc.
Scottsdale,Arizona 85260
Inflow velocity test
Digital Safety Inspector Ohmic Instruments Co.
Easton, Maryland 21601
Electrical leakage and ground
resistance tests
GFI Circuit Tester Leviton Manufactoring
Little Neck, New York, 11362
Electrical leakage, ground resistance,
and polarity tests
Photometer Air Techniques
Owing Mills, Maryland, 21117
Filter leak test
Aerosol Generator Air Techniques
Owing Mills, Maryland, 21117
Generation of aerosol mist
Description of field test terms:
 Nominal value: Default value as specified by Kendro Laboratory Products.
 Set point: Acceptable operating value for the inflow and downflow velocities.
 Measuring value: Value measured at the cabinet location.
 Average value: The sum of the measuring values divided by the number of tests. The average value is com-
pared with the nominal value.
 Tolerance: Acceptable deviation from the nominal value.
 Inflow velocity (m/s): Velocity of the air entering the work opening.
 Exhaust velocity (m/s): Velocity of the airflow discharged through the exhaust filter opening.
 Exhaust airflow volume rate (m³/s): Airflow volume discharged through the exhaust filter.
 Downflow velocity (m/s): Velocity of the displacement flow circulating through the work chamber.