300 Datasheet, PDF (7/8 Pages) DB Lectro Inc – SCREW TYPE SERIES

NON-CONTACT ULTRASOUND
355
For Liquid Level,
Volume or Open
Channel Flow
Outstanding measurement performance and value
in a two-wire, integral transmitter featuring flexible
software and advanced signal processing.
Temperature Compensated Echo Rejection
The Model 355 has a patent-pending echo rejection technique that
constantly adjusts the rejected echo profile based on the current
sound propagation velocity. This technique keeps the transmitter track-
ing the actual liquid level as opposed to false targets even when tem-
perature changes alter the shape of the echo rejection profile.
Dual Flow Totalizers
Two 7-digit flow totalizers are provided for
recording flow. One totalizer is resettable and
the other is non-resettable. Several multipliers
are selectable to allow for proper scaling.
Totalizer time is also recorded to show how
long each totalizer has been recording flow.
Stored Tank Shapes for Volume
Volume configuration with the 355 is as easy as selecting the tank
shape and inputting 1–3 dimensions. While a 20-point custom table is
also available, selecting the actual tank shape provides for a fast and
accurate configuration for a variety of common tank shapes.
Model 355 Transmitter Specifications
Power Supply
16 to 36 VDC
Power Consumption
Less than 1 Watt
Output Signal
4–20 mA with optional HART^®
Fault Detection
Selectable from 3.6, 22 mA, or hold
Damping
Adjustable from 1–60
Ambient Temperature -40° to +175° F (-40° to 80° C)
Display
2-line × 16-character LCD
Keypad
4-push-button menu-driven
Compensation
Auto temperature compensation
over transducer operating range
Transducer Specifications
Frequency
60 kHz
Beam Angle
Conical 10°
Max Range
20 feet (6 meters)
Blocking Distance 10 inches (250 mm)
Process Temp
-40° to +175° F (-40° to +80° C)
Process Pressure 0 to 43.5 psig (0 to 3 bar)
Material
Kynar^® Flex (PVDF) or polypropylene
Protection
NEMA 6P (IP 68)
Applications
Accuracy
Greater of ±0.2% of range or
Repeatability
Resolution
Linearity
Response Time
Warm-up Time
Enclosure
Protection
0.24 inch (6 mm)
±0.125 inch (3 mm)
0.1 inch (2.5 mm)
±0.4 inch (10 mm)
Less than 1 second (typical)
30 seconds
Cast aluminum or Lexan^®
NEMA 6 (IP 67)
• Sump, Well, Tank Level
• Highly Viscous Media
• Paint, Ink & Solvents
• Food & Beverage Vessels
• Batch & Day Tanks
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