Heraeus HS 12, Service Manual, Page: 176 / 282

3
rd
page Testing Safety Cabinet Class II according to EN 12 469
Low-turbulence repression flow
Mean repression flow speed for product protection 0.25 m/s – 0.5 m/s
Measuring level 50 mm - 100 mm above working opening
Testing grid measuring points
1 m/s 2 m/s 3 m/s 4 m/s Mean air speed
5 m/s 6 m/s 7 m/s 8 m/s m/s
No individual measuring must deviate more than 20% from mean value! Requirement fulfilled
Yes No
Measuring instruments and their application
Measuring instrument
Measuring
instrument no.: Calibration note
no.:
Calibration date Application
VDE-testing instrument VDE-Safety test
Anemometer Air speed metering
Particle monitor 28.3 l/min Air filter free of leakage
Dilution system 1:1000 Particle measuring filter
Aerosol generator ./. ./. ./. Particle measuring filter
Test aerosol DEHS ./. ./. ./. Particle measuring filter
Flow test tube ./. Use before: Fire gas test
TEST RESULTS ACCORDING TO EN 12 469
Retaining at working opening Requirement fulfilled
Yes No
Integrity of exhaust air filter Requirement fulfilled
Yes No
Product protection (class II only) Requirement fulfilled
Yes No
Cross contamination (class II only) Requirement fulfilled
Yes No
KI – Disk method (voluntary) Requirement fulfilled
Yes No
Instrument complies with state of the art as per DIN EN 12 469 with regards to personal
protection
Yes No
Date Signature Customer Date Signature Service Engineer
8 7 6 5
4 3 2 1
Dimension 120
cm
Dimension 90 cm
2/8
1/4
2/8
2/8
1/8
1/8
1/2
1/4
11,25 cm
15,00 cm
18,75 cm Dimension 150
Dimension 180 22,50 cm
D
a
te
:
2
0
0
1
-
1
0
-0
1