Dwyer IEFS - Manual (Page 8)

Page 13 Page 12
Problem Probable Cause Try...
No pulse output
Output pulses incor-
rect
Jumpy reading
Connect to earth ground
Check the Presence of Flow LED (see p. 12)
Note flow direction arrow,
reverse direction to meter
Change output connections
Check plumbing
Check for proper electrical wiring
Check for power across power input terminals
Reverse connections
Select another flow meter
Check for proper ground
Check depth setting from
Dimension “C” table (page 4)
Select another flow meter
Check for full pipe or install meter in the verti-
cal
position
Check for air pockets or turbulence. Refer to
installation, page 6
Check for proper electrical wiring
Install chemical injection line downstream of
magmeter (or far enough upstream to allow
complete mixing of fluids before meter)
Unit not grounded
Below minimum flow cutoff
Flow reversed
Output connections reversed
Pipe not full
Excessive electrical noise
No power
Power reversed
Fluid conductivity <20 microSiemens/cm
Missing or incorrect ground wire
Incorrect depth setting
Fluid conductivity <20 microSiemens/cm
Empty pipe
Not enough straight pipe
Excessive electrical noise
Rapidly changing conductivity (in chemi-
cal injection or fertigation applications)
TROubLEShOOTING OPERATION & MAINTENANCE
Nominal Pipe Size
3” 4” 6” 8” 10” 12” 14” 16” 18” 20” 24” 30” 36”
PVC/Steel
Sch. 40
70.397 40.985 18.130 10.497 6.674 4.709 3.900 2.989 2.364 1.904 1.319
PVC/Steel
Sch. 40
78.748 45.360 20.084 11.495 7.322 5.184 4.297 3.281 2.588 2.094 1.451
Stainless Steel
(10S)
62.385 36.626 16.510 9.642 6.173 4.373 3.620 2.756 2.169 1.762 1.223 0.784 0.576
Stainless Steel
(40S)
70.397 40.985 18.130 10.497 6.674 4.661 3.827 2.893 2.263 1.819 1.249 0.791 0.580
Copper Tubing
(Type k)
76.371 43.552 19.513 11.201 7.230 5.016
Copper Tubing
(Type L)
78.371 44.638 20.223 11.622 7.500 5.239
brass Pipe 70.672 41.517 17.778 10.445 6.674 4.661
Duct Iron
(Class 52)
57.376 37.320 16.915 9.503 6.197 4.325 3.189 2.443 1.931 1.565 1.088 0.747 0.520
IEFS k-factors (in Pulses/Gallon) for various pipe sizes
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 Dwyer Instruments Inc. sensors in pulses per gallon, and
is given on the chart “K-factors for Various Pipe Sizes” below.
These numbers are based on extensive testing, which has
shown close agreement between different IEFS sensors in
the same installation. Typically, most K-factor errors can be
attributed to installation variables, such as depth setting and
fitting configuration.