Seametrics EX800-Series - Manual (Page 11)

30Vdc Max. 6m
A
- + - +
12-24Vdc
3 4 5 6 2 1
Power Forward
Output
Zero
Adj
Status
LED
NOTICE
Wa
rranty is void if unauthorized repair
is attempted!
OPERATION & MAINTENANCE
Zero Adjustment. When the EX800-Series 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.
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 approximately 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 EX800-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 EX800-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 EX800-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.
10031295
EF81T-P200
K:158.42
If the EX800-Series meter is ordered with a saddle or wel-
dolet 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