2.4 Instrument Description
18
The Slave address in the Master can remain on the standard value
1, provided the standard address in the Slave has not been
changed.
See also Interfaces on page 65.
2.4.4 Measuring Device for Free Fall Measurement
The measuring frame must be installed close to the discharge sta-
tion. This reduces the theoretical rate of fall at the measuring
point, for according to the law of gravitation the rate of fall rises as
the distance increases. With rising rate of fall the weight per area
and thus the accuracy of the measurement decreases.
When using the free fall bulk flow meter on pipes, a measuring de-
vice as depicted in Figure 9 is used. The measuring device can
simply be mounted onto existing fall-pipes. It consists of a shield-
ing with rod source and a variably adjustable holding plate for the
detector. Depending on the diameter of the fall-pipe, the holding
plate can be adjusted via the 4 threaded rods.
Am-241 shielding
Shielding plate preventing access to the radiation path
a = b = Variable adjustment
c = ca. 420 mm d = Pipe diameter between 89.9 and 304 mm
Figure 9: Free fall bulk flow measuring device (top view)
On fall chutes, measuring frame and rod source holder are used as
depicted in Figure 7.
a
b
To Next Page
Loading...
