Zero Adjustment, Minimum Flow, Flow Rate Table, Presence Of Flow Indication, Filtering, Electrode Coating, Calibration ("K-Factor"), K-Factor Chart; Flow Rate Table, K-Factor Char T - Seametrics EX80 Series Instructions Manual

oPEration & maintEnancE
Zero adjustment. When the EX81 or 82 is powered up
and there is no flow, there should be no output pulses (or,
if connected to the FT420, 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.
Status
lED
Zero
adjust
Pins
To perform the adjustment, after determining that there is
a full pipe with no flow, short between the two pins marked
"Zero Adjust". A red LED light will come on for approxi-
mately 50 seconds and then go out. The zero adjustment
is completed.
minimum Flow. As with any other flow sensor, there is a rate
below which the EX80-series sensor cannot read. Check the
flow rate table below for the minimum flow rate detectable
by the sensor for a given pipe size.
FloW ratE (gPm)
1" 1-1/2"
• Min .50 1.1
• Max 50 110 196
Presence of Flow indication.
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 ever y 8.0
seconds. When there is detectable flow, the same indicator
blinks every 3.0 seconds.
Filtering. The software of the EX80-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.
1 2 3 4 5 6
- -
Status + +
Power
LED Forward
Output
Zero
Adjust
Pins
2" 3" 4" 6"
2 4.5 8 18 31
440 783 1763 3133 4895
To assist in troubleshooting,
Electrode coating.
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.
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 EX80 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).
If the EX80 Series meter is ordered with a saddle or wel-
dolet fitting, find your K-factor in the chart below.
K-FactorS SaDDlES & WElDolEtS
PVc/Steel
Sch. 40
8" 10"
PVc/Steel
49
Sch. 80
Stainless
Steel (10S)
Stainless
Steel (40S)
copper tubing
(type l)
copper tubing
(type K)
brass Pipe
Duct. iron
(class 52)
Grease or other adhering, non-
10031295
K:158.42
EF81T-P200
Find your K-Factor Here
3" 4" 6" 8"
70.397 40.985 18.130 10.497
78.748 45.360 20.084 11.495
62.385 36.626 16.510 9.642
70.397 40.985 18.130 10.497
76.371 43.552 19.513 11.201
78.371 44.638 20.223 11.622
70.672 41.517 17.778 10.445
57.376 37.320 16.915 9.503
10"
6.674
7.322
6.173
6.674
7.230
7.500
6.674
6.197
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