Dwyer EFS2 - Manual (Page 6)

Page 8
oPEration & maintEnancE
Zero adjustment. When the EFS2 Series is powered up
and there is no flow, there should be no output pulses (or, if
connected to the RTI, flow rate should read “0”). If there are
pulses it may be necessary to adjust the flow meter under no-
flow conditions after it has been installed. This should only be
done if the indicated flow is low, near the lower cutoff.
To perform the adjustment, after determining that there is a
full pipe with no flow
, create a short between the two pins
marked “Zero Adjust”. Once the red LED light comes on for
approximately 50 seconds and then goes out, the zero adjust-
ment is completed.
minimum Flow. As with any other flow sensor, there is a rate
below which the EFS2 Series sensor cannot read. Check the
flow rate table below for the minimum flow rate detectable by
the sensor for a given pipe size.
Presence of Flow indication. To assist in troubleshooting,
the “Status LED” has two blinking modes in normal operation.
When there is no flow detectable by the meter (below minimum
threshold) the LED blinks every 8.0 seconds. When there is
detectable flow, the same indicator blinks every 3.0 seconds.
Filtering. The software of the EFS2 Series sensor filters out
electrical noise and averages sudden variations in the flow to
smooth the output. It takes a matter of seconds for the flow
sensor to get up to full output when it is powered up or when
flow begins.
calibration (“K-factor”). The K-factor represents the actual
number of pulses per gallon the meter produces during a flow
test. This number can be entered into your electronic control
to make it read properly. If the EFS2 Series meter is ordered
with a tee fitting, it is factory-calibrated in the fitting and the
K-factor is indicated on the side of the fitting (see diagram).
Find your K-Factor Here
Page 9
Zero
adjust
Pins
Electrode coating. Grease or other adhering, non-conductive
materials can stop flow detection if the electrodes become
heavily coated. To clean the electrodes, remove the sensor
from the pipe and gently scrub the electrodes (three silver
bumps) on the reading face of the flow sensor. A mild soap
(dishwashing liquid for example) can be used to aid the
cleaning process.
If the EFS2 Series meter is ordered with a saddle or weldolet
fitting
, find your K-factor in the chart below.
3” 4” 6” 8” 10” 12”
K-FactorS SaDDlES & WElDolEtS
Status
lED
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)
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: K-factors are in Pulses/gallon. For Pulses/Liter, divide
by 3.785.
4.709
5.184
4.373
4.661
5.016
5.239
4.661
4.325
1” 1-1/2” 2” 3” 4” 6” 8” 10” 12”
• Min
.7 1.5 2.7 6 11 25 44 69 99
@ 0.28 ft/sec
• Max
49 110 196 440 783 1760 3130 4900 7050
@ 20 ft/sec
FloW ratE (gPm)
Nominal
Pipe Size
reverse output option
Problem Probable cause try...
Check plumbing
Check the presence of Flow with the use of the
Flow Indication LED (see pg. 8)
Connect to earth ground
Check for proper electrical wiring
Check for power across power
input terminals
Note flow direction arrow,
reverse direction of meter
Reverse connections
Change output connections
Select another flow meter
Check for proper ground
Check for proper electrical wiring
Select another flow meter
Check for full pipe or install meter in the verti-
cal position
Check for ten diameters upstream AND five
diameters downstream
Install chemical injection line downstream of
magmeter (or far enough upstream to allow
complete mixing of fluids before meter)
Pipe not full
Below minimum flow cutoff
Unit not grounded
Excessive electrical noise
No power
Flow reversed
Power reversed
Output connections reversed
Fluid conductivity <20 microSiemens/cm
Missing or incorrect ground wire
Excessive electrical noise
Fluid conductivity <20 microSiemens/cm
Empty pipe
Not enough straight pipe
Rapidly changing conductivity (in chemical
injection or fertigation applications)
caution & troublESHooting
troublESHooting
caution: The electronics of the EFS2 Series meters are not field-repairable.
Warranty is void if unauthorized repair is attempted
No pulse output
Output pulses
incorrect
Jumpy reading