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505-1320 Series Ultrasonic Open Channel Flowmeter
SECTION 1
INTRODUCTION
1.1
Product Description
1.2
Technology
1.3
Models Available
The Drexelbrook Series 505-1302 Open Channel Flowme-
ter accurately measures continuous open channel flow up
to a range of 99.9 inches, using ultrasonic technology. The
flowrate output is a 4-20 mA dc signal.
Ultrasonic sensor is made of CPVC, Teflon and 316 SS or Teflon
Sealtyte
TM
for compatibility with wide range of process materials.
Ultrasonic transmitters work on the principle of sending a
pulsed, high-frequency sound wave from a peizo electric
transducer to the contents of the vessel. The device mea-
sures the length of time it takes for the reflected sound
wave to return to the transducer. A successful measure-
ment depends on reflection from the process material in a
straight line back to the transducer.
The two basic modes of operation are the "delta level" and
"delta distance." In the delta level mode, the current output
(4-20 mA dc) increases as the liquid level rises. In the delta
distance mode, the current output increases as the level falls
(distance to the transducer increases). The desired span
range may be set from a minimum of 3 inches up to 30 feet.
To ignore obstructions in the channel, Autoprofiling
mapping has been developed, which allows a "sonic snap-
shot" of an empty channel. The transducer transmits a
sound burst and the echo is recorded as a signature of the
channel bottom and sides. Any obstructions will send an
echo and create a profile. Later on, this signature or profile
is locked into the ultrasonic unit's memory so it will not
respond to echoes created by these obstructions.
5 0 5 - 1 3 2 0 - X 0 X
Electronic Unit:
2 - Adjustable Gain Electronic Unit
4 0 5 - 1 3 X 2 - 0 0 1 - X 0
Input Power:
0 - 120 Vac
1 - 24 Vdc
1 - 24 Vdc
3 - 240 Vac
1
TM
Continuous Open Channel
Flowmeter System
Transducer Material:
2 - CPVC
6 - Teflon and 316 SS
TM
7 - Sealtyte
Configuration options:
0 - Integral Electronics
7 - Remote Electronics
Continuous Open Channel
Flowmeter Electronic Unit
Relay Drivers:
2 - two
4 - three
TM
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