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OPERATION & MAINTENANCE <br /> When the EX81. or 82 is powered up and there is no flow, K-factor. If the EX80 Series meter is ordered with its <br /> there should be no output pulses (or, if connected to the fitting, it is factory calibrated in the fitting. A K-factor(meter <br /> F17420, flow rate should read "0"). If there are pulses... factor) is indicated on the side of the fitting. This repre- <br /> sents the actual number of pulses per gallon the meter <br /> Zero Adjustment. In some cases it may be necessary produced during the factory flow test. This number can <br /> to adjust the flow meter under no-flow conditions after it entered into an Fi'420 or FT520 flow indicator to make it <br /> has been installed. read properly. If a pulse divider is being used, the Kfactor <br /> is the starting point for calculating the divider number. <br /> To perform the adjustment, after determining that there is <br /> no flow, short between the two pins marked "zero Adj." A <br /> red LED light will come on for approximately 50 seconds LOCATION OF K-FACTOR <br /> and then go out. The zero adjustment is completed. <br /> Minimum Flow. As with any other flow sensor,there is a <br /> i rate below which the EX80-series sensor cannot read. <br /> Check the flow rate table below for the minimum flow rate <br /> detectable by the sensor for a given pipe size. <br /> FLOW RANGE (GPM) <br /> 5 +6 10931395 <br /> • Min .54 1.3 2 4.5 8 18 3181T <br /> 0 Max 54 127 209 461 794 1800 3120 <br /> Find Your K-Factor Here <br /> Filtering. The software of the EX80-series sensor filters <br /> out electrical noise and also averages sudden variations <br /> in the flow to smooth the output. It takes a matter of <br />[ seconds for the flow sensor to get up to full output when it <br /> f is powered up or when flow begins. If the unit responds <br /> very slowly, it is probably due to excessive electrical noise. <br /> If this is the case,check for adequate grounding to improve <br /> the response. <br /> Electrode Coating. Grease or other adhering, non- <br /> conductive materials can stop flow detection if the <br /> electrodes become heavily coated.To clean the electrodes, <br /> remove the sensor from the pipe and gently scrub the <br /> electrodes (three dark grey bumps) on the reading face of <br /> f - the flow sensor. A mild soap (dishwashing liquid for <br /> E example) can be used to aid the cleaning process. <br /> Page 8 <br /> w <br />