仪器简介：

Cussons new range of Laminar Flow Meters (LFM) have been developed from the Ricardo Viscous Flow Air Meters 
(VFAM) originally introduced by J. F. Alcock for measuring pulsating air flows in internal combustion engine air intakes. 
This new range of air flow meters retains all the attributes of the previous range, and also introduces new features, whilst extending the number of meter sizes which are available. 
· Five sizes of housing for nominal element diameters at 95 mm, 120 mm, 160 mm. 215 mm and 305 mm. 
· Elements of 0·61 mm passage size for multi-cylinder engines. 
· Elements of 0·46 mm passage size for single cylinder and twin cylinder engines. 
· The Elements can now be removed from the meter housings for ultrasonic cleaning. 
· Housings incorporate provisions for mounting the pressure transducers (from Cussons P7028 Mass Flow Computer) on the housing in a sealed enclosure. 
· Improved pneumatic damping is provided at the pressure connection points. 
Laminar Flow Meters eliminate the measurement errors which occur with pulsating flows with kinetic meters of the orifice or venturi type. These errors, which are due to both root mean square effects and to pulsating flow in the measurement ports, are eliminated in LFMs as the resistance to flow of the element is directly proportional to velocity, and pressure tapping connection errors are eliminated by the special design of the connections, any square law entry and exit losses to the element are tuned out during calibration.

技术参数：

                  最大空气流量（升/秒）                                        传感器尺寸                                    总尺寸 
型号      发动机额定流量             稳定流量               直径(mm)         通道尺寸(mm)            长度            直径 
P7200          25                             200                            95                     0.46                              433          153 
P7201          50                              134                           95                     0.61                               433          153 
P7204         50                                400                         120                   0.46                                470         180 
P7205        100                              237                          120                   0.61                                470         180 
P7208        100                              800                           160                  0.46                                500          225 
P7209         200                             457                           160                  0.61                                500          225 
P7212         200                            1600                          215                  0.46                                615           285 
P7213         350                             887                           215                   0.61                                615          285 
P7216         350                             2800                         305                  0.46                                 735         370 
P7217         650                            1733                          305                  0.61                                 735          370

主要特点：

¨ Accurate Flow Measurement 
¨ Ranges available 25 to 650 litres per second 
¨ May be used with Pulsating Flows 
¨ Unaffected by Elbows or Bends in Ducts 
¨ True linear Characteristics 
¨ “Square Law” Errors Eliminated by Tuning 
¨ Large Turn Down Ratio 
¨ Element Removable for Cleaning 
¨ Improved Pneumatic Damping at Pressure Connections

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