{"id":911,"date":"2015-08-13T11:08:05","date_gmt":"2015-08-13T16:08:05","guid":{"rendered":"http:\/\/www.kele.com\/keleblog\/?p=911"},"modified":"2022-02-09T14:07:08","modified_gmt":"2022-02-09T20:07:08","slug":"uft-helpful-application-notes","status":"publish","type":"post","link":"https:\/\/www.kele.com\/content\/blog\/2015\/08\/13\/uft-helpful-application-notes","title":{"rendered":"UFT Helpful Application Notes"},"content":{"rendered":"

Kele designed the Universal Flow Transmitter (UFT<\/a>) for use with Badger\/Data Industrial flow sensors<\/a>, but in reality the UFT can be used with many other makes and models of flow sensors if their signal outputs are compatible with the UFT signal input.<\/p>\n

Kele frequently gets asked the question \u201cwill this Model XYZ flow sensor<\/a> work with the UFT?\u201d\u00a0 So we decided that it might be a good idea to write an article addressing this topic and at the same time provide other application information beyond that shown on the UFT data sheet.<\/p>\n

UFT Power<\/strong><\/p>\n

The UFT requires 24VDC<\/a> +\/- 10% at 80 mA maximum for operation.\u00a0 Note that the UFT cannot<\/strong> be powered with 24VAC.<\/p>\n

UFT Flow Sensor Input Circuit<\/strong><\/p>\n

The UFT will accept pulses from the following types of flow sensors:<\/p>\n

    \n
  1. Sensor output that is open-circuit in the \u201chigh\u201d state and conducts to common in the \u201clow\u201d state.\u00a0 Most Badger\/Data Industrial flow sensors operate this way.\u00a0 For this type of sensor output, install the \u201cPWR XDCR\u201d jumper located near the PWR LED across both pins of the header.\u00a0 When the sensor contact is open, 8V will appear across it.\u00a0 When the sensor contact is closed, 8 mA of current will flow through it.\n
    \"\"
    Figure 1: Switch Style Flow Sensor<\/figcaption><\/figure>\n

     <\/li>\n

  2. Powered sensor output that drives to a \u201chigh\u201d value of +5 to +24VDC and drives to a \u201clow\u201d value of 0 to +2VDC. \u00a0For this type of sensor install the PWR XDCR jumper on just one pin of the 2-pin header.\n

    \"\"
    Figure 2: Voltage Drive Flow Sensor<\/figcaption><\/figure><\/li>\n<\/ol>\n

    Up to 2000 feet of sensor cable<\/a> 20AWG or larger can be used with the UFT, but to reduce noise pickup, please use the shortest length of sensor cable actually needed for the application.<\/strong><\/p>\n

    The flow sensor must put out no pulses (0 Hertz signal) with no flow.<\/p>\n

    To be compatible with the UFT Span adjustment range, the flow sensor must put out pulses between 15 Hertz and 150 Hertz at full flow velocity (max GPM).<\/p>\n

    There is an XCDR SIG IN LED that indicates the state of the input signal from the flow sensor.\u00a0 When the input is \u201chigh\u201d the LED is on, when the input is \u201clow\u201d the LED is off.\u00a0 When the pulse rate is fast, the LED may appear to stay on continuously even though it is actually going on and off very rapidly.\u00a0 If the sensor is working properly, you should always be able to see the LED flashing when the flow is first starting up or ramping back down to zero.\u00a0 At no flow, the XDCR SIG IN LED may be either on or off depending on the resting state of the flow sensor output.<\/p>\n

    The UFT can be factory modified to handle higher input frequencies (up to 1000 Hertz) at max flow velocity.\u00a0 It cannot be modified to handle any frequency lower than 15 Hertz at max flow velocity.<\/p>\n

    4-20 mA Output Circuit<\/strong><\/p>\n

    The 4-20 mA output represents the instantaneous (averaged over about 5 seconds) flow rate.\u00a0 The UFT powers (sources) the 4-20 mA internally, an external power supply should not be inserted in the 4-20 mA loop.\u00a0 The output will be 4 mA at 0 GPM (no flow).\u00a0 The output will be 20 mA at whatever maximum flow GPM the UFT is calibrated for.<\/p>\n

    The 4-20 mA output is designed to drive a maximum load impedance of 750 ohms.\u00a0 If the mA output is open-circuited, approximately 20V will appear between MA SIG OUT and COMMON.<\/p>\n

    \"\"
    Figure 3: 4-20mA Output Circuit<\/figcaption><\/figure>\n

    The 4-20 mA output normally comes from Kele pre-calibrated for the sensor model and maximum flow rate specified on the customer order.\u00a0 When Kele calibrates the UFT, a label is attached to the top of the board specifying the calibration parameters.\u00a0<\/strong><\/p>\n

    Field Calibration (Not Recommended)<\/strong><\/p>\n

    The UFT can be field calibrated if a steady maximum flow rate can be maintained (see following procedure).<\/p>\n

    Caution:<\/strong>\u00a0 once the SPAN pot is turned in the field, it will be impossible to fall back to the factory calibration setting that was done at Kele.<\/p>\n

      \n
    1. Stop flow completely (or disconnect sensor wire) and trim the ZERO pot for 4 mA output.<\/li>\n
    2. Establish steady max flow rate and trim SPAN pot for 20 mA output.<\/li>\n<\/ol>\n

      The 4-20 mA output changes slowly when trimming the ZERO and SPAN pots, you must be patient and wait for the output to stop changing with each pot adjustment.<\/p>\n

      Pulse Output Circuit<\/strong><\/p>\n

      The UFT pulse output circuit can be used to drive a mechanical\/electronic totalizer or an automation system binary input point for gallon totalization in software.<\/p>\n

      The UFT pulse output is optically isolated from the remaining UFT electronics.\u00a0 The pulse output does not drive any voltage of its own, the voltage must be provided by the load.\u00a0 The pulse output connections are polarity sensitive.<\/p>\n

      In the \u201chigh\u201d state the pulse output is open-circuit.\u00a0 In the \u201clow\u201d state the plus and minus terminals are connected together with approximately a 0.7V difference between them.\u00a0 This will be seen by most automation system binary inputs as a contact closure. The UFT pulse output can operate from 1-40VDC in the \u201chigh\u201d (open) state.\u00a0 The UFT pulse output can carry as much as 200 mA in the \u201clow\u201d state<\/p>\n

      \"\"
      Figure 4: Pulse Output Driving Totalizer Module<\/figcaption><\/figure>\n

       <\/p>\n

      \"\"
      Figure 5: Pulse Output Driving BAS Binary Input<\/figcaption><\/figure>\n

       <\/p>\n

      The pulse output is jumper-selectable for divide-by-10 or divide-by-100 operation.\u00a0 For divide-by-10 operation, one complete (high and low) output pulse is generated for each 10 sensor pulses.\u00a0 For divide-by-100 operation, one complete (high and low) output pulse is generated for each 100 sensor pulses.\u00a0 There is no other calibration for the UFT pulse output (no trimpots). There is a PULSE OUT LED which indicates whether the pulse output is open-circuit (LED off) or conducting (LED on).\u00a0 Note that if the pulses stop coming from the flow sensor, the output could stop in either the open-circuit (LED off) or conducting (LED on) state.<\/p>\n

      Testing the UFT Without a Flow Sensor<\/strong><\/p>\n

        \n
      1. Disconnect the sensor wire (if present) from the XDCR SIGNAL IN screw.<\/li>\n
      2. Install the PWR XDCR jumper on both header posts.<\/li>\n
      3. Move the divide-by-10\/100 jumper to the 10 position.<\/li>\n
      4. Connect a jumper wire to the Common screw.<\/li>\n
      5. Tap the other end of the jumper wire on the XDCR SIGNAL IN screw.<\/li>\n<\/ol>\n
        \"\"
        Figure 6: Testing UFT Without Flow Sensor<\/figcaption><\/figure>\n

         <\/p>\n

        As you tap the wire, you should see the XDCR SIG IN LED go on and off.\u00a0 The PULSE OUT LED should cycle on and off for every few taps of the wire.\u00a0 The mA signal should rise above 4 mA and the faster you tap, the higher the mA should go. If the UFT behaves as described above, it is functioning properly.<\/p>\n

        \"\"
        Figure 7: Complete Application Diagram<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

        Kele designed the Universal Flow Transmitter (UFT) for use with Badger\/Data Industrial flow sensors, but in reality the UFT can be used with many other makes and models of flow sensors if their signal outputs are compatible with the UFT signal input. Kele frequently gets asked the question \u201cwill this Model XYZ flow sensor work […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[7],"tags":[],"class_list":["post-911","post","type-post","status-publish","format-standard","hentry","category-kele-makes-it-easy"],"acf":[],"yoast_head":"\r\nUFT Helpful Application Notes - kele.com<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.kele.com\/content\/blog\/2015\/08\/13\/uft-helpful-application-notes\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"UFT Helpful Application Notes - kele.com\" \/>\r\n<meta property=\"og:description\" content=\"Kele designed the Universal Flow Transmitter (UFT) for use with Badger\/Data Industrial flow sensors, but in reality the UFT can be used with many other makes and models of flow sensors if their signal outputs are compatible with the UFT signal input. 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