12
Operation
Where necessary, refer to the drawings in the
section.
Operating the Equipment
Measurement of Volume Flow Rate
The moulded bench top incorporates a volumetric measuring tank which is stepped
to accommodate low or high flow rates.
A remote level gauge, consisting of a sight tube and calibrated scale is connected to
a tapping in the base of the tank, and gives an instantaneous indication of water level
inside the volumetric tank. The scale is divided into two zones corresponding to the
volume above and below the step in the tank. In operation, the volumetric tank is
emptied by lifting the dump valve, allowing water to return to the sump. When flow
trough the model on test has stabilised, the dump valve is lowered, retaining the
water in the tank.
Timings are taken as the water level rises in the tank. Low flow rates are monitored
on the lower portion of the scale corresponding to the small volume beneath the step
(6 litres capacity). Larger flow rates are monitored on the upper scale corresponding
to the main tank (40 litres capacity).
When extremely small volumetric flow rates are to be measured, the measuring
cylinder should be used rather than the volumetric tank. When using the measuring
cylinder diversion of the flow to and from the cylinder should be synchronised as
closely as possible with the starting and stopping of the watch.
All volumetric readings using the volumetric tank should be taken with the stilling
baffle installed since calibration has been effected in this condition.
Operating the Software
Note:
The diagrams in this section are included as typical examples and may not
relate specifically to an individual product.
The Armfield Software is a powerful Educational and Data Logging tool with a wide
range of features. Some of the major features are highlighted below, to assist users,
but full details on the software and how to use it are provided in the presentations
and Help text incorporated in the Software. Help on Using the Software or Using the
Equipment is available by clicking the appropriate topic in the
Help
drop-down menu
from the upper toolbar when operating the software as shown:
Load the software. If multiple experiments are available then a menu will be
displayed listing the options. Wait for the presentation screen to open fully as shown:
