Echotel
®
Model 300/301
Ultrasonic Non-Contact
Transmitter For Level, Volume,
and Open Channel Flow
D E S C R I P T I O N
The Model 300/301 is a full-featured, powerful ultra-
sonic system for measurement of liquid level, volume,
or open channel flow. Available as an integral or
remote mounted transmitter, this extremely versatile
system is simple to install and calibrate. The non-
contact design means that it is not affected by changes
in specific gravity, viscosity, or conductivity.
F E A T U R E S
•
Isolated 4–20 mA output includes an active/passive
mode for loop power or device power.
•
RS-485 with Modbus protocol allows bi-directional
communication with DCS or PLC.
•
Two or four 10 amp SPDT gold flash relays provide
flexibility for most alarm and control schemes.
•
16-button keypad and two-line, 16-character LCD
alphanumeric display.
•
Temperature compensation integral to ultrasonic
transducer.
•
Output in units of level, volume, or open channel
flow.
•
Most common flumes and weirs preprogrammed in
memory in addition to the Manning formula and a
custom table using either a linear or spline curve.
•
Complete self-diagnostics checks all relays, outputs,
and system functionality.
•
Class I, Div. 1, Groups B, C, and D on both the
transmitter and transducer.
•
QuickCal mode allows complete system calibration
in 90 seconds.
•
Powerful 38 kHz EchoMaster™ ultrasonic transducer
performs in difficult applications.
•
Password protection prevents unwanted tampering
with configuration data.
A P P L I C A T I O N S
•
Water and wastewater
•
Slurries
•
Viscous fluids
•
Acids
•
Oils
•
Caustics
T E C H N O L O G Y
The Model 300/301 is a versatile system that utilizes non-
contact ultrasonic technology to measure liquid levels in
a variety of applications. The system consists of a trans-
mitter and an ultrasonic transducer. The transducer con-
tains a piezoelectric crystal that has the ability to convert
electrical signals generated by the transmitter into ultra-
sonic pulses.
The unit operates by directing ultrasonic pulses, or
sound waves, through the air toward the liquid surface.
They are then reflected off the liquid surface as an echo,
and returned to the transducer. The piezoelectric crystal
then converts the returned echo into an electrical signal
which is analyzed by the transmitter. The elapsed time
between the generation of the ultrasonic pulse and the
return echo is proportional to the distance between the
face of the transducer and the liquid surface.
T Y P I C A L
M O U N T I N G
C O N F I G U R A T I O N S
channel flow installation with the transducer mounted on
a bracket. Figure 2 shows how the unit can be mounted
in a coupling or flange for level or volume applications.
The transducer is installed above the liquid surface. A
minimum dead zone distance of 18" (457 mm) must be
allowed between the face of the transducer and the maxi-
mum attainable level. Figure 1 shows a typical open
Model 300
Flange
Model 300
Air
Flow
Maximum range 30.0' (9.1 m)
Dead zone
18" minimum
(457 mm)
Liquid
Maximum span
28.5' (8.7 m)
Parshall
Flume
Figure 1
Typical Mounting – Open Channel Flow
Figure 2
Typical Mounting — Level/Volume
2
T Y P I C A L
M O U N T I N G
C O N F I G U R A T I O N S
12 degree ultrasonic beam away from pumps, ladders,
side walls, or other obstructions in the vessel.
Figure 3 shows how the transducer can often be mounted
further down in a wet well or sump if the liquid will
never reach the top of the vessel. This helps to keep the
Figure 3
Typical Transducer Mounting - Wet Well or Sump
U L T R A S O N I C
B E A M
A N G L E
liquid surface. The chart below shows the distance the
transducer should be located away from side walls and
obstructions. The distances are based on a 6° beam radius
at different heights above the liquid surface. Generally
speaking, the transducer should be mounted one foot
away for every 10 feet of height.
A 12° conical beam of ultrasonic energy is emitted from
the face of the transducer. The transducer should be
mounted in a location such that the ultrasonic signal does
not touch the side walls or any other obstructions in the
vessel. This is typically accomplished by using a bracket,
half-coupling, or rigid conduit to mount the transducer in
a spot where a strong echo can be received off of the
Distance from
Transducer Face (feet)
3'
6'
9'
12'
15'
18'
21'
24'
27'
30'
33'
12° Beam
Diameter (feet)
0.6'
1.3'
1.9'
2.5'
3.2'
3.8'
4.4'
5.0'
5.7'
6.3'
6.9'
Minimum Distance from
Wall or Obstruction (inches)
4"
8"
11"
15"
19"
23"
26"
30"
34"
38"
42"
3
A G E N C Y
AGENCY
A P P R O V A L S
PROTECTION METHOD
AREA CLASSIFICATION
MODEL
FM
300-RXXX-45X
301-RXXX-400 with
384-XKXX-0XX
Indoors & Outdoors
NEMA Type 4X & IP 65
Hazardous locations
Class
I,
Div. 1; Groups B, C & D
Class
II,
Div. 1; Groups E, F & G
Class
III
TYPE 4X enclosure
CSA
300-RXXX-45X
301-RXXX-400 with
384-XKXX-0XX
300-RXXX-45X
301-RXXX-400 with
384-XK0X-0XX
384-XK1X-0XX
and
384-XKYX-0XX
Non-hazardous
Hazardous locations
Class
I,
Div. 1; Groups B, C & D
Class
II,
Div. 1; Groups E, F & G
Class
III
Class
I,
Div. 1; Groups C & D
Class
II,
Div. 1; Groups E, F & G
Class
III
Hazardous locations
These units have been tested to EN 50081-2
and EN 50082-2 and are in compliance with
the EMC Directive 89/336/EEC.
D I M E N S I O N A L
I N C H E S
( M M )
S P E C I F I C A T I O N S
3.87 (98)
Rotation
clearance
5.93 (151)
5.93
(151)
3.87 (98)
Rotation
clearance
8.46
(215)
12.25
(311)
10.68
(271)
8.46
(215)
1" NPT
1" NPT
(plugged)
1" NPT
1" NPT
2.37
(60)
2" NPT
Process
Connection
3.00 (76) or 10.00 (254)
Insertion Length
2 Holes
.38 (10) Dia.
3.00
(76)
3.75
(95)
2.00
(51)
3/4" NPT
Plug
2.12 (54) Insertion Diameter
3.50
(89)
Model 300 Integral Mount
Model 301 Remote Mount with Bracket
4
D I M E N S I O N A L
I N C H E S
( M M )
S P E C I F I C A T I O N S
MODEL 384 TRANSDUCERS
1" NPT
Process
Connection
3/4" NPT
4.63 (118)
Dia.
3.00 (76)
2.75
(70)
2" NPT
Process Connection
4.50
(114)
3.00" (76)
Insertion Length
2.12 (54)
Insertion Dia.
2" NPT
Process
Connection
1" NPT
Process
Connection
3.00" (76)
Insertion Length
10.00" (254)
Insertion Length
10.00" (254)
Insertion Length
2.12 (54)
Insertion Dia.
2.12 (54)
Insertion Dia.
1" NPT Transducer without Housing
2.12 (54)
Insertion Dia.
2" NPT
Process
Connection
2" NPT Transducer with Housing
2" NPT
Process
Connection
3.00" (76)
Insertion Length
10.00" (254)
Insertion Length
2.12 (54)
Insertion Dia.
2.12 (54)
Insertion Dia.
2" NPT Transducer without Housing
OPTIONAL MOUNTING BRACKETS
2" Female NPT
(P/N 36-3813-001)
3.00
(76)
29.00
(736)
2" Female NPT
(P/N 36-3812-001)
3.12
(79)
2.00
(50)
20.50 (520)
1.50
(38)
2.00
(50)
3.12
(79)
6.12
(155)
20.50
(520)
1.50
(38)
22.50
(571)
3.00
(76)
22.50 (571)
Floor Mount Bracket
Wall Mount Bracket
5
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