Dwyer EFF - Manual

Technical Bulletin
K-Factors for Series
PWF & EFF
The accuracy of Dwyer Instruments Inc. flow meters depends
on the accuracy of the K-factor for each meter fitting or
spool piece. Tee fittings and spool-type meters are wet-
calibrated in the factory before shipping to the customer,
and the K-factor appears on a label on each individual fitting
or meter. Saddle and weldolet fittings cannot be factory-
calibrated because the K-factor will vary depending on the
type of pipe on which the meter is installed.
K-FACTORS FOR SAddle And weldOleT FiTTingS
SeRieS eFF FOR SeRieS eFS2
3" 4" 6" 8" 10"
70.397
78.748
62.385
70.397
76.371
78.371
70.672
57.376
40.985
45.360
36.626
40.985
43.552
44.638
41.517
37.320
18.130
20.084
16.510
18.130
19.513
20.223
17.778
16.915
6.674
7.322
6.173
6.674
7.230
7.500
6.674
6.197
10.497
11.495
9.642
10.497
11.201
11.622
10.445
9.503
nOTe : These K-factors are in Pulses Per Gallon. To convert to Pulses Per Liter, divide by 3.785.
.
geneRAl inFORMATiOn
The charts below give K-factors for Series EFS2
(Electromagnetic) and Series PDWS (Paddle wheel) meters
installed in saddle or weldolet fittings on various pipes. On
the chart that corresponds to your meter type, locate your
pipe size and type. Enter the corresponding K-factor into
your controller.
SAddle And weldOleT FiTTingS
SeRieS PwF FOR SeRieS PdwS
3" 4" 6" 8"
28.92
32.368
25.614
28.920
31.386
32.212
29.033
23.548
16.790
18.591
14.996
16.790
17.847
18.294
17.009
15.282
7.412
8.215
6.747
7.412
7.981
8.272
7.268
6.913
4.275
4.684
3.926
4.275
4.563
4.736
4.254
3.485
PVC/Steel
Sch. 40
PVC/Steel
Sch. 80
Stainless
Steel (10S)
Stainless
Steel (40S)
Copper Tubing
(Type l)
Copper Tubing
(Type K)
Brass Pipe
duct. iron
(Class 52)
Dwyer Instruments, Inc. • 102 Indiana Highway 212 • Michigan City, IN 46360 • USA
(P) 219.879.8868 • (F) 219.872.9057 • 1.800.872.9141 • www.dwyer-inst.com
F-PWF/EFF