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student_documentation:lfm [2021/02/11 17:46] – created - external edit 127.0.0.1student_documentation:lfm [2025/01/20 15:20] (current) – [Handling] Beni Ammann
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 ====== Liquid Flowmeter (LFM) ====== ====== Liquid Flowmeter (LFM) ======
 +
 +=== CAN powered version ===
 +This model is primarily used for Urban Concept vehicles
  
 {{:student_documentation:lfm.png?nolink&450|}} {{:student_documentation:lfm.png?nolink&450|}}
  
-Prototype vehicles are at this time not required to install a liquid flowmeter.+=== Standalone Verison === 
 +This model is primarily used for Prototype vehicles 
 + 
 + 
 +{{  :student_documentation:lfm:lfm_standalone.png?direct&250  |}} 
 + 
 + 
 + 
 + 
 +Urban Concept and selected Prototype vehicles are required to install a liquid flowmeter.
  
 ==== Description ==== ==== Description ====
-The Max P-Series of Flow Meters are positive displacement piston type units capable of great accuracy over a wide range of flow rates and fluid viscosities. The P001-Shell Eco-marathon-001 Liquid Flow Meter (LFM) will measure flows from 0.005 to 200 cc/min.+The Max P-Series of Flowmeters are positive displacement piston type units capable of great accuracy over a wide range of flow rates and fluid viscosities. The P001-Shell Eco-marathon-001 Liquid FlowMeter (LFM) will measure flows from 0.005 to 200 cc/min.
    
-In a piston type flow meter, four pistons and cylinders are arranged in a radial fashion around a central crankshaft. Two fluid ports on the cylinder wall, a port at the top of the cylinder, and a grooved piston enable fluid entering the flow meter’s central cavity to be measured and pumped out by each piston in turn. The valving action for each cylinder is accomplished by the piston adjacent to it. The accuracy of a piston flow meter is dependent on close tolerances in the cylinder wall and piston. Max Machinery regularly holds tolerances as fine as 0.00005 inches in the production of these meters. The movement of the pistons is converted to a circular motion at the central crankshaft, which is coupled to a magnet in the flow meter. This motion is sensed by an external electronic transmitter, which converts flow into a pulse train further processing by the transmitter.+In a piston type flowmeter, four pistons and cylinders are arranged in a radial fashion around a central crankshaft. Two fluid ports on the cylinder wall, a port at the top of the cylinder, and a grooved piston enable fluid entering the flowmeter’s central cavity to be measured and pumped out by each piston in turn. The valving action for each cylinder is accomplished by the piston adjacent to it. The accuracy of a piston flowmeter is dependent on close tolerances in the cylinder wall and piston. Max Machinery regularly holds tolerances as fine as 0.00005 inches in the production of these meters. The movement of the pistons is converted to a circular motion at the central crankshaft, which is coupled to a magnet in the flowmeter. This motion is sensed by an external electronic transmitter, which converts flow into a pulse train further processing by the transmitter.
  
-The latest generation of transmitters use modern sensor technology coupled with advanced signal processing to deliver high levels of performance and reliability. Hall sensors are used to detect the position of a driven magnet inside a Max Flow Meter. Changes in position are tracked by a microprocessor, which generates an output proportional to the flow rate. Advanced signal processing provides both fine angular resolution (0.36 degrees rotation) and rapid response (output updated every one millisecond).+The latest generation of transmitters use modern sensor technology coupled with advanced signal processing to deliver high levels of performance and reliability. Hall sensors are used to detect the position of a driven magnet inside a Max Flowmeter. Changes in position are tracked by a microprocessor, which generates an output proportional to the flow rate. Advanced signal processing provides both fine angular resolution (0.36 degrees rotation) and rapid response (output updated every one millisecond).
  
-Filtration: Clearances between the flow meter piston and cylinder wall are typically 0.0002” to 0.0004”. Any dirt present in the system can jam or damage the unit. A 7 micron filter (such as a Swagelok SS-4F-7 stainless steel unit) is required, although materials with very high viscosities may require a coarser filter.+Filtration: Clearances between the flowmeter piston and cylinder wall are typically 0.0002” to 0.0004”. Any dirt present in the system can jam or damage the unit. A 7 micron filter (such as a Swagelok SS-4F-7 stainless steel unit) is required, although materials with very high viscosities may require a coarser filter.
  
-Temperature: A temperature sensor has been integrated into the liquid flow meter to allow sample by sample flow correction.+Temperature: A temperature sensor has been integrated into the liquid flowmeter to allow sample by sample flow correction.
  
 {{ :student_documentation:lfmparts.jpg?nolink&600 |}} {{ :student_documentation:lfmparts.jpg?nolink&600 |}}
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 ==== Drawings and Dimensions ==== ==== Drawings and Dimensions ====
 +=== CAN powered version ===
 +This model is primarily used for Urban Concept vehicles
  
 {{ :student_documentation:lfmdimension.jpg?nolink&300 |}} {{ :student_documentation:lfmdimension.jpg?nolink&300 |}}
 +
 +=== Standalone Verison ===
 +This model is primarily used for Prototype vehicles
 +
 +{{ :student_documentation:lfm:dimensions.png?direct&600 |}}\\
 +
 +
 +{{ :student_documentation:lfm:lfm-standalone_drawing_v1_1.pdf |}}
 +
 +==== 3D model ====
 +
 +=== CAN powered version ===
 +This model is primarily used for Urban Concept vehicles
 +
 +
 +{{url>https://cdn.sem-app.com/stl/LFMmockup.html 640,400 noscroll noborder}}
 +
 +[[https://cdn.sem-app.com/stl/LFMmockup.stl|Download as STL file]]
 +
 +[[https://cdn.sem-app.com/stl/LFMmockup.step|Download as STEP file]]
 +
 +=== Standalone Verison ===
 +This model is primarily used for Prototype vehicles
 +
 +
 +{{url>https://cdn.sem-app.com/stl/LFMsaMockup.html 640,400 noscroll noborder}}
 +
 +[[https://cdn.sem-app.com/stl/LFMsaMockup.stl|Download as STL file]]
 +
 +[[https://cdn.sem-app.com/stl/LFMsaMockup.step|Download as STEP file]]
  
 == Filter & Fittings == == Filter & Fittings ==
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 ==== Installation before event ==== ==== Installation before event ====
 Prior to arrival at the event, teams should: Prior to arrival at the event, teams should:
-  * Locate an area to accommodate the Liquid Flow Meter (LFM) in a vertical position with the electrical connector at the top.+  * Locate an area to accommodate the Liquid Flowmeter (LFM) in a vertical position with the electrical connector at the top.
   * This location must be below the fuel injector and the fuel tank, preventing air from flowing through the LFM.   * This location must be below the fuel injector and the fuel tank, preventing air from flowing through the LFM.
   * The LFM may be secured with cable ties or the two ¼” - 20 NC threaded holes on the bottom.   * The LFM may be secured with cable ties or the two ¼” - 20 NC threaded holes on the bottom.
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 ==== Installation at the event ==== ==== Installation at the event ====
-  - Remove union from fuel line at location of desired flow meter location +  - Remove union from fuel line at location of desired flowmeter location 
-  - Connect fuel line from fuel tank to the inlet of the fuel filter of the flow meter +  - Connect fuel line from fuel tank to the inlet of the fuel filter of the flowmeter 
-  - Connect fuel line from the injector to flow meter outlet +  - Connect fuel line from the injector to flowmeter outlet 
   - Open the fuel tank valve slowly to allow fuel to fill the lines all the way to the injector (opening fuel line at injector might be required)   - Open the fuel tank valve slowly to allow fuel to fill the lines all the way to the injector (opening fuel line at injector might be required)
   - Reconnect the fuel line at the injector when most of the air is out of the system   - Reconnect the fuel line at the injector when most of the air is out of the system
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   - Plug LFM cable into the Sensor port on the OBC   - Plug LFM cable into the Sensor port on the OBC
  
- +===== Handling ===== 
 +This applies only to the standalone Version of the liquid Lfow Meters 
 + 
 +^**LED Measurement** ||  {{:student_documentation:lfm:lfm_led_meas.png?nolink&30|}}| 
 +|  <color #000000> ❶ </color>  |Device off || 
 +|  <color #FF0000>«❶»</color>  |Error || 
 +|  <color #ff9933>«❶»</color>  |Initializing || 
 +|  <color #66ff33> ❶ </color>  |Measuring || 
 +|  <color #66ff33>«❶»</color>  |Resetting Values|| 
 +^**LED Battery**||  {{:student_documentation:lfm:lfm_led_batt.png?nolink&30|}}| 
 +|  <color #000000> ❷ </color>  |Device off || 
 +|  <color #FF0000>«❷»</color>  |low Battery, charging || 
 +|  <color #ff9933>«❷»</color>  |Charging || 
 +|  <color #66ff33>«❷»</color>  |Charging Complete / Operates without battery (Blinks twice followed by pause) || 
 +|  <color #FF0000> ❷ </color>  |Low Battery || 
 +|  <color #ff9933> ❷ </color>  |Charge Battery soon || 
 +|  <color #66ff33> ❷ </color>  |Battery well charged || 
 +^**On/Off Switch**||  {{:student_documentation:lfm:lfm_but_on.png?nolink&30|}}| 
 +|Turn the Liquid Flow Meter on before going on track and switch it off after you returned|||
Log In (for D&T Team and Volunteers ONLY) student_documentation/lfm.1613065616.txt.gz · Last modified: 2021/02/11 17:46 by 127.0.0.1

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