300-R010-45G Datasheet, PDF (6/36 Pages) Magnetrol International, Inc. – Echotel® Model 300/301 Ultrasonic Non-Contact Transmitter For Level/Volume/Open Channel Flow

TRANSDUCER MOUNTING cont.
ULTRASONIC BEAM ANGLE
The transducer must be mounted such that the beam does
not touch the sidewall or obstructions (ladders, fill lines, sub-
merged pumps, etc.) between the transducer face and the
liquid surface. The ultrasonic pulse is emitted with a beam
spread of 12° (6° radius) from the face of the transducer.
Objects that extend into the ultrasonic beam can produce
false echoes that may give erroneous level readings.
Table 1 can be used to determine how far away from the wall,
ladder, submerged pump, or other obstruction, the transduc-
er must be mounted to avoid producing false echoes.
Generally speaking, the transducer should be mounted one
foot away for every 10 feet of height.
Distance from
Transducer
Face (feet)
12° Beam
Diameter (feet)
Minimum Distance
from Wall or
Obstruction (inches)
3'
0.6'
4"
6'
1.3'
8"
9'
1.9'
11"
12'
2.5'
15"
15'
3.2'
19"
18'
3.8'
23"
21'
4.4'
26"
24'
5.0'
30"
27'
5.7'
34"
30'
6.3'
38"
Table 1
Ultrasonic Beam Angle
CAUTION: HAND TIGHTEN ONLY. Do NOT use a pipe
wrench or other tools when tightening the transducer. Do
NOT tighten by holding onto the transducer housing.
Avoid excessive twisting of the transducer cable.
CAUTION: Do NOT install transducers in the center of
domed roof tanks. Locate transducers 1' to 3' off-center
to minimize false/multiple echoes being reflected off the
domed roof.
TRANSMITTER MOUNTING
CAUTION: The instrument is rated per IEC 1010 for use
in installation Category II, Pollution Degree 2.
If the unit is supplied as an integral Model 300, please skip
to the next section which covers proper ESD handling pro-
cedures. This section covers proper transmitter mounting
if the unit is a Model 301 remote transmitter.
TRANSMITTER MOUNTING LOCATION
The following guidelines should be taken into considera-
tion when selecting the mounting location for the remote
mounted Model 301 transmitter:
1. Keep the transmitter away from potential sources of
electromagnetic noise that may interfere with the per-
formance of the unit.
TRANSMITTER MOUNTING LOCATION cont.
2. Avoid locations that are exposed to intense direct sun-
light. In locations where intense sunlight is a concern,
use a sunshade over the unit.
3. Also avoid locations that are subjected to flooding or
excessive vibration or shock.
NOTE: A switch or circuit breaker shall be installed in
close proximity to equipment and within easy reach of
operator. It shall be marked as the disconnecting device
for the equipment.
ELECTROSTATIC DISCHARGE (ESD) HANDLING PROCEDURE
Magnetrol electronic instruments are manufactured to the
highest quality standards. These instruments utilize electron-
ic components which may be damaged by static electricity
present in most work environments. The following steps are
recommended to reduce the risk of component failure due to
electrostatic discharge:
1. Ship and store circuit boards in anti-static bags. If an
anti-static bag is not available, wrap board in aluminum
foil. Do not place boards on foam packing materials.
2. Use a grounding wrist strap when installing and remov-
ing circuit boards. A grounded workstation is also rec-
ommended.
3. Handle printed circuit boards only by the edges. Do not
touch components or connector pins.
4. Ensure that all electrical connections are completely
made and none are partial or floating. Ground all
equipment to a good, earth ground.
6