300-R010-45G Datasheet, PDF (32/36 Pages) Magnetrol International, Inc. – Echotel® Model 300/301 Ultrasonic Non-Contact Transmitter For Level/Volume/Open Channel Flow

RS-485 WIRING
Standard Beldon 8451 shielded, twisted pair, 22-gauge
stranded conductors may be used for interconnection of
units. Order cable through Magnetrol (part number, 009-
7146-001), specify length at the time of order; 10 feet (3 m)
minimum, 5000 feet (1524 m) maximum.
The preferred method of wiring is that all units be wired in
parallel. It is permissible to have branches, not exceeding
five feet, from the main wiring trunk. One master with a max-
imum of 31 slave devices is allowable.
1. Connect terminal A from the master device to terminal
A on all slave devices.
2. Connect terminal B from the master device to terminal
B on all slave devices.
3. Connect shielding from ground of master to ground on
all slave devices.
NOTE: Polarity among units in loop must be observed.
The master device and last (farthest) slave device in the loop
must have a termination resistor. This resistor is provided in
the Model 300/301 by jumper placement of JP1. The termi-
nation jumper JP1 is located under the shield, below the RS-
485 terminal block. The jumper JP1 should be in positions 2
and 3 (factory position) for all slave devices except the last
(farthest) device in the loop, which should have the jumper in
positions 1 and 2.
TROUBLESHOOTING
APPLICATION CHECKLIST
Check for the following sensitivities before proceeding to the
next section:
Vapors ____________________________________________
Mild _________________ Excessive _________________
Foam _____________________________________________
Surface Agitation ___________________________________
Angle of Repose ____________________________________
Temperature _______________________________________
Pressure ___________________________________________
Obstructions _______________________________________
If any of the above sensitivities are present, consult the fac-
tory for recommendations.
INSTALLATION CHECKLIST
Cable
1. _____ Was Belden 8102 used? If other cable was used,
permanent damage may have been done to the
transmitter.
2. _____ Is transducer wiring run in a dedicated conduit?
3. _____ Is transducer shield connected at both ends?
Transducer
1. _____ Check transducer alignment. Is it vertical?
2. _____ Is transducer mounted hand tight?
Overtightening may cause ringing, some installa-
tions may require using a shock absorber.
3. _____ Is minimum nozzle diameter 8 inches?
4. _____ Is maximum nozzle height 11 inches?
5. _____ Check beam path for obstructions, including
tank wall. Refer to page 6 for Ultrasonic Beam
Spread.
6. _____Check transducer housing for moisture.
Process
1. _____ Check for foam.
2. _____ Are vapors present? Visible vapors may cause
false level reflections, invisible vapors may alter
speed of sound.
3. _____ Is liquid surface turbulent?
4. _____ Does the tank have a mixing blade? Could it be
providing false level readings or creating a vor-
tex resulting in echo loss?
Transmitter
Enter the specified menu, and obtain the following informa-
tion before consulting the factory.
Measured Values Menu
Level _____________________________________
Temperature _______________________________
Distance __________________________________
System Configuration
Range ____________________________________
Span _____________________________________
Diagnostics Menu
Gain ______________________________________
Signal Strength __________________________%
OTHER INFORMATION
1. Is transmitter indoors or out? ______________________
2. What is the distance from the
transducer face to current level? ___________________
3. What is the transmitter’s
serial number? ___________________________________
4. What is the temperature?
a. At transmitter _________ b. At transducer ______
5. What is the media
being measured? _________________________________
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