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OPERATION & MAINTENANCE t-: When the EX100 Series Meter is powered up and there is Calibration ("K-Factor"). In order to properly process F no flow,there should be no output pulses (or, if connected pulses from the flow sensor, a number must be entered to the FT420, flow rate should read "0"). If there are into the control to which the sensor is connected. This pulses... number, called the K-factor, is the number of pulses the ti sensor puts out per unit of fluid passing through the pipe. Zero Adjustment. In some cases it may be necessary It is normally provided for SeaMetrics sensors in pulses F to adjust the flow meter under no-flow conditions after it per gallon, and is given on the chart "K-factors for Various has been installed. Pipe Sizes." These numbers are based on extensive test- ing, which has shown dose agreement between different r To perform the adjustment, after determining that there is EX sensors in the same installation. Typically, most K-fac- no flow, short between the two pins marked "Zero Adj." A for error can be attributed to installation variables, such f red LED light will come on for approximately 50 seconds as depth setting and fitting configuration. and then go out. The zero adjustment is completed. Minimum Flow. As with any other flow sensor,there is a rate below which the EX100 Series sensor cannot read. Check the the table on page 11 for the minimum flow rate detectable by the sensor (0.2) for a given pipe size. E �• Filtering. The software of the EX100 Series sensor filters i Fout electrical noise and also averages sudden variations i 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 very slowly, it is probably due to excessive electrical noise. F, 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 F 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. 1' L! FPage 10