| 摘要 |
The arms (2) of the tuning fork structure are circular in cross-section, and parallel-connected, being joined, in company with inlet and outlet pipes (4,5), to a fastening block (3). Two piezo-electric crystals (7) are fitted between the arms in the vicinity of the fastening block, and connected electrically to a computer unit. They monitor the momentary resonance frequency of the two arms. - Measurement is based on the principle that a vibrating body resonance frequency is dependent upon its mass. Fluid to be measured is fed through the inlet pipe (4), conducted via the fastening block through the two tubes, back via the fastening block again, and out through the outlet tube (5). The arms of the tuning fork structure can be made to vibrate either laterally or torsionally, dependent upon the density measurement unit formation. Lateral vibration is normal, but where fluids contais large quantities of gas bubbles and/or heavy particles, then the optional vibration is appropriate. (Provisional basic advised week 8805)(1,2/3) |
