1 - Gilson Eng
SITRANS LR560 FAQs
Q. When would I use the SITRANS LR560 instead of ultrasonic level measurement technology?
A. In general, radar is virtually unaffected by the atmosphere in the silo, including vapor, temperature, pressure or dust. For solids applications less than 30 m in height, ultrasonic technology is usually appropriate if the dust level is minor (such as plastic pellets or grain). The LR560 would be preferred over ultrasonic devices for hot material, very dusty material, or materials that are extremely noisy during filling. If the silo is being filled pneumatically, then the dust will be very intense and radar is recommended.
Q. Can the SITRANS LR560 be used in a hazardous area?
A. Yes, dust approvals are available for hazardous areas and some gas approvals are also supported. Please check the catalog sheet for details.
Q. Is the SITRANS LR560 safe to operate?
A. Yes. The output power is significantly less than that transmitted by cellular phones.
Q. Is the dielectric constant important?
A. The dK is not really relevant in these applications. Most solids materials have a dielectric constant of less than 3.0. As long as the material bulk density is high, such as sugar, sand, cement powder, plastics, etc. then the reflectivity will be sufficient. Some low bulk density powders that are very light and fluffy might be a challenge due to an extremely low dielectric constant and for those we would recommend the SITRANS LR460.
Q. Is there any maintenance required on the SITRANS LR560?
A. Usually not. As long as the solids material is dry, there will not be any significant buildup on the antenna. Slight coatings on the surface of the lens antenna will not influence the signal. For really aggressive buildup problems, an air purge feature is included.
Q. When would the LR460 radar transmitter be recommended instead of the LR560?
A. The LR460 would be preferred if the measurement range is greater than 40m, as it has a slightly higher signal. In addition, if the dielectric constant value is less than 2.0, the LR460 would be recommended.
Q. What is the advantage of 78GHz radar over low frequency radar?
A. 78GHz offers the advantage of a small lens antenna and a very narrow beam of only 4 degrees. This allows the LR560 to be installed practically anywhere on the silo without any interference signals. A very short wavelength is transmitted at 78GHz and this wave reflects very well from most solids materials, even on a slope, providing very reliable and stable level readings. Lower frequency radar devices will produce complex signals on solids with a slope.
Q. Does the SITRANS LR560 have built-in diagnostics?
A. Yes. There are parameters by which signal quality can be checked. In addition, the instrument continually checks itself for internal faults and reports problems when necessary.
Q. What software do I need to do diagnostics and maintenance?
A. We recommend using Siemens SIMATIC® PDM. This allows programming, parameter storage, and diagnostics. Contact your local Siemens Milltronics representative for more information. In addition, Emerson AMS and Pactware are supported.
Q. How is the SITRANS LR560 programmed?
A. The instrument can easily be programmed using Intrinsically Safe hand programmer locally at the device with a simple quick start wizard. This normally takes a minute or two. Alternately, programming can be accomplished over a HART®, PROFIBUS PA, or Foundation Fieldbus network.
Q. I wish to install two SITRANS LR560s on the same vessel. Will there be any interference?
A. No, the instruments will not interfere with each other. This applies to all Siemens radar level transmitters.
Q. Where would I use the SITRANS LG200 Guided Wave radar transmitter instead of the SITRANS LR560?
A. For materials with extreme angles of repose and surfaces that are very smooth the LG200 would be recommended. For small silos or hoppers less than 5m in height it may be a better choice to use guided wave radar.
Q. Does the SITRANS LR560 have a backlight?
A. Yes. This will be very useful when the device is installed in areas with low lighting conditions.
Q. Are all flanges designed so they can be rotated to aim the LR560?
A. No, the stainless steel flanges do not have any rotation/aiming feature..
Q. What does the color of the lens mean?
A. Amber is ULTEM and is provided with 40m/100C version
Beige is PEEK and is provided with the 100m/200C version
Q. Is the standard 4-20 unit a high in-rush ma?
A. NAMUR: Namur NE43 compliant, device preset to failsafe ................
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