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Figure 6. Carrying Case
Figure 7. Open-Channel-Velocity
Sensor
Carrying Case
The carrying case for the Model 2000 (Figure 6)
is a padded nylon case with two compartments
and a shoulder strap. The back compartment is for
the meter, and the front compartment is for the
sensor and cable. The sensor compartment is
made of nylon mesh which lets air circulate
through the sensor compartment.
SENSORS
The Model 2000 can be configured with an open-channel-velocity sensor, a one-inch full-pipe-
velocity sensor, or a two-inch full-pipe-velocity sensor. The open-channel-velocity sensor is the
standard configuration.
Open-Channel-Velocity Sensor
The front of the open-channel-velocity sensor is
round with three electrodes. A mounting hole is in
back, and a thumbscrew is on top (Figure 7). The
front of the sensor must be pointed upstream and the
electrodes must be in contact with the flow to get
good readings.
Comment:
The electrodes on all sensors must be kept free from
nonconductive coatings such oil and grease.
The open-channel-velocity sensor shape produces a
cosine response which greatly reduces errors due to
sensor positioning. For example, if the front of the
sensor is pointed away from the flow at a 10° angle,
the cosine of 10° is 0.98480. This is only 1.5%
lower than the actual velocity.
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