13
• With the airow indicator in a vertical position, ensure that the bottom of the oating ball rests at, or above, the
minimum ow mark for the ‘letter’ representing your ‘Zone’ (Fig. 14-2). Airow indicator must be in the vertical
position for an accurate reading.
The airow indicator is graduated into different ‘zones’ based on air density, which is based on elevation and ambient
temperature. To determine your zone, determine the elevation and temperature for the environment where you are
conducting the airow check. See your supervisor if you are not certain of these values. Find the zone where your
elevation and temperature intersect on the chart supplied with the airow indicator (Chart 1).
Fig. 14-1 – Attaching airow indicator Fig. 14-2 – Checking airow
°C -10 01020304050
m1432506886 104 122
-305 -1000 ABCDEFG
00BCDEFGH
305 1000 CDEFGH I
610 2000 DEFGHI J
915 3000 EFGH IJK
1219 4000 FGHI JKL
1524 5000 GH IJKLM
1829 6000 HI JKLMN
2134 7000 IJKLMNO
2439 8000 JKLMNOP
2744 9000 KLMNOPQ
3048 10000 LMN OPQR
3353 11000 MNOPQRS
3658 12000 N OPQRST
3963 13000 OPQRSTU
4268 14000 PQRSTUV
4573 15000 QRSTUVW
4877 16000 RSTUVWX
5182 17000 STU VWX Y
°F
ft
Chart 1 – Determining airow indicator zone based on elevation and temperature. Recommended use temperature
range: 23°F to 131°F (-5°C to 55°C). Recommended elevation: -328 feet to 16404 feet (-100 meters to 5000 meters).
Contact 3M Technical Service if intended use may be outside of these ranges.
NOTE: If the airow indicator ball fails to rise at or above the minimum ow level, do not use the motor/blower unit. Refer to
the 3M™ Versao™ Powered Air Purifying Respirator TR-800 “Troubleshooting” guide or contact 3M Technical Service.
7. Low ow alarm check: Check the low airow alarm by simulating a low airow condition. With the motor/blower on:
• Remove the airow indicator and tightly cover the outlet of the motor/blower with the palm of your hand. The motor
should automatically speed up, attempting to compensate for the low airow condition.
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