NuAire LabGard NU-813-300, Руководство по эксплуатации и техническому обслуживанию

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OM0236 Page 32 of 52
February/2019
Table 7.0
Recommended Measurement Methods for CVE Inflow
A. Inflow/Velocity Measurement
a. Instrument: Shortridge Flowhood ADM-870 or TSI 8355 Thermo anemometer.
b. Procedure:
The inflow velocity is measured by using a Direct Inflow Measurement (DIM) Instrument (i.e. Shortridge flowhood).
The DIM Instrument can be used directly on the cabinet with NO CORRECTION FACTORS REQUIRED.
The DIM Instrument should also be duct taped to the cabinet to prevent any sneak air paths from occurring.
The DIM Instrument will read inflow volume (i.e. CFM).
Use the window access opening area to calculate inflow velocity.
Alternate Procedure
The calculated inflow measurement method may also be used.
Inflow air velocity is measured on a 4” by 4” (102mm by 102mm) grid in a vertical plane defined by the access opening.
Readings are taken 3” (76mm) from the top and bottom of the opening and 4” (102mm) from the sides.
c. Test Data - Inches (mm):
DIM Measurement:
300/E 400/E 600/E
Measured Intake Volume ft. 3 /min. (m 3 /s) ft. 3 /min. (m 3 /s) ft. 3 /min. (m 3 /s)
Access Open Area 2.43 ft 2 (.23 m 2 ) 3.26 ft 2 (.3 m 2 ) 4.86 ft 2 (.45 m 2 )
Inflow Velocity ft./min.(m/s) ft./min.(m/s) ft./min.(m/s)
Inflow Velocity Measurement - Inches (mm):
Front Access Opening
300/E
4
(102)
8
(203)
12
(305)
16
(406)
20
(508)
24
(610)
28
(711)
32
(813)
400/E
4
(102)
8
(203)
12
(305)
16
(406)
20
(508)
24
(610)
28
(711)
32
(813)
36
(914)
40
(1016)
44
(1118)
600/E
4
(102)
8
(203)
12
(305)
16
(406)
20
(508)
24
(610)
28
(711)
32
(813)
36
(914)
40
(1016)
44
(1118)
48
(1219)
52
(1321)
56
(1422)
60
(1524)
64
(1626)
68
(1727)
3
(76)
7
(178)
Number of Readings Average Velocity ft./min.(m/s)
d. Acceptance Criteria: Nominal velocity must average 75 to 85 fpm (.38 to .43 m/s)