Dwyer IPFS - Manual (Page 5)

iNsTALLATiON
caution: These flow sensors are not recommended for installation down-
stream of the boiler feedwater pump where installation fault may expose the
flow sensor to boiler pressure and temperature. Maximum recommended
temperature is 200°F.
FULL PiPe recOMMeNDATiONs
recOMMeNDeD NOT recOMMeNDeD
recOMMeNDeD NOT recOMMeNDeD
Allows air pockets to form at sensor
Ensures full pipe
Post-valve cavitation can create air pocket Keeps pipe full at sensor
Air can be trapped Allows air to bleed off
recOMMeNDeD NOT recOMMeNDeD
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cONNecTiON
cONNecTiON
Sensors are supplied with 18 ft. of cable. For sensors with
no additional electronics, see diagram for color coding of
connections. For sensors with on-board electronics, see the
manual accompanying the electronic module.
calibration (“K-Factor”). In order to properly process pulses from
the flow sensor, a number must be entered into the control to
which the sensor is connected. This number, called the K-factor,
is the number of pulses the sensor puts out per unit of fluid
passing through the pipe. It is normally provided for Seametrics
sensors in pulses per gallon, and is given on the chart “K-factors
for Various Pipe Sizes.” These numbers are based on extensive
testing, which has shown close agreement between different IP
sensors in the same installation. Typically, most K-factor error
can be attributed to installation variables, such as depth setting
and fitting configuration.
It is occasionally possible to field calibrate a sensor by catching
the fluid in a measured container and comparing with the number
of pulses recorded. (To record individual pulses, set the K-factor
on the control to 1.00.) This is especially desirable if the instal-
lation has less than the recommended length of straight pipe
upstream of the sensor.
3" 4" 6" 8" 10" 12" 16" 24" 30" 36"
34.246 19.221 7.830 4.611 2.883 1.859 1.224 .577 - -
38.329 21.844 8.779 4.980 3.213 2.097 1.304 .656 - -
30.331 16.581 7.045 4.270 2.621 1.703 1.160 .519 .332 -
34.246 19.221 7.830 4.611 2.883 1.836 - - - -
38.145 21.420 8.846 5.027 3.302 2.126 - - - -
37.167 20.774 8.505 4.873 3.167 2.011 - - - -
34.381 19.545 7.658 4.593 2.883 1.836 - - - -
28.137 16.994 7.238 4.213 2.633 1.681 1.065 .461 .297 .207
PVC/Steel
Sch. 40
PVC/Steel
Sch. 80
Stainless Steel
(10S)
Stainless Steel
(40S)
Copper Tubing
(Type K)
Copper Tubing
(Type L)
Brass Pipe
Duct. Iron
(Class 52)
Nominal Pipe Size
Table 3: iPFs K-factors
5 to 24VDC