Dwyer ISDP - Manual (Page 12)

ArEA
Thes
flow,
imum
feet
circu
reso
d.S (
PEAK
VALy
FLO (Flow) SUB MENU
For flow measurements the following units are available:
SCFM - Standard cubic feet per minute
M^3H - Cubic meters per hour
FLO r (Flow Range) SUB MENU
LO - 99.99 x 1K flow range
HI - 999.9 x 1K flow range
Tables 3 -6 show the flow ranges available, and the maximum duct size that can be set for
each input range.
Table 3
FLOr = LO Maximum Duct Size (English)
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
SCFM
RANGE
99.99 x 1K
99.99 x 1K
99.99 x 1K
99.99 x 1K
99.99 x 1K
99.99 x 1K
99.99 x 1K
99.99 x 1K
MAX. DUCT
SIZE, SQ. FT.
78.9
49.9
35.3
24.9
15.7
11.1
7.8
4.9
Table 4
FLOr = HI Maximum Duct Size (English)
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
SCFM
RANGE
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
MAX. DUCT
SIZE, SQ. FT.
789.8
499.5
353.1
249.7
157.9
111.7
78.9
49.9
Table 5
FLOr = LO Maximum Duct Size (Metric)
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
Mˆ3/Hr
RANGE
99.99 x 1K
99.99 x 1K
99.99 x 1K
99.99 x 1K
99.99 x 1K
99.99 x 1K
99.99 x 1K
99.99 x 1K
MAX. DUCT
SIZE Mˆ2
4.32
2.73
1.93
1.37
0.86
0.61
0.43
0.27
Table 6
FLOr = HI Maximum Duct Size (Metric)
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
Mˆ3/Hr
Range
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
MAX. DUCT
SIZE, Mˆ2
43.19
27.31
19.3
13.64
8.63
6.10
4.31
2.73
KFAC SUB MENU
KFAC K Factor - becomes accessible if the instrument is set for Velocity or Flow. When
the Digihelic ® II Controller is used with a Pitot tube, the manufacturer may specify a K
Factor. The adjustment range is 0.01 to 2.00. The factory setting is 1.
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