Seametrics EX80 Series v.1 - Manual (Page 10)

OPERATION & MAINTENANCE
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...
Zero Adjustment. In some cases it may be necessary
to adjust the flow meter under no-flow conditions after it
has been installed.
To per form the adjustment, after determining that there is
no flow, short between the two pins marked “Zero Adj.” 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 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.
Filtering. The software of the EX80-series sensor filters
out electrical noise and also 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. If the unit responds
ver y slowly, it is probably due to excessive electrical noise.
If this is the case, check for adequate grounding to improve
the response.
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 dark grey bumps) on the reading face of
the flow sensor. A mild soap (dishwashing liquid for
example) can be used to aid the cleaning process.
Page 8
K-factor. If the EX80 Series meter is ordered with its
fitting, it is factor y calibrated in the fitting. A K-factor (meter
factor) is indicated on the side of the fitting. This repre-
sents the actual number of pulses per gallon the meter
produced during the factor y flow test. This number can
entered into an FT420 or FT520 flow indicator to make it
read properly. If a pulse divider is being used, the K-factor
is the star ting point for calculating the divider number.
LOCATION OF K-FACTOR
10031295
MF81T-P200
K: 53.6
Find Your K-Factor Here
1” 1-1/2" 2" 3" 4" 6" 8"
• Min .54 1.3 2 4.5 8 18 31
• Max 54 127 209 461 794 1800 3120
FLOW RANGE (GPM)
AR
CH
IVE
D
(Includes Dates 6/14/04 to 5/05)