Prototype vehicles are not required to install a liquid flowmeter during the 2019 season. Flow Meter Installation Area with Fittings
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.
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.
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).
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.
Temperature: A temperature sensor has been integrated into the liquid flow meter to allow sample by sample flow correction.
Caution! Do not exceed a flow rate greater than 200 cc/min or permanent damage will occur and teams may be liable.
|Weight (LFM only)||900g (2lbs)|
|Dimensions (LFM only)||Ø 57mm x 105mm tall (Ø 2.3” x 4.125” tall)|
|Assembled Dimensions|| Ø 57mm x 130mm tall x 206mm wide
(Ø 2.3” x 5.1” tall x 8.1” wide)
|Flow Range||0.005 to 200 cc/min|
|Maximum Pressure||500 bar|
|Ambient Operating Temperature Range||-40° to 80°C|
|Metered Liquid Temperature Range||-40° to 90°C|
|Required Filtration||7 micron|
|Port Size||SAE ¼”|
|Supply Voltage||5-26 Vdc|
|Supply Current||25-30 mA typical|
Prior to arrival at the event, teams should: