Flow, level & control Level measurement in chocolate production

When a chocolate manufacture needed reliable level measurement, it turned to VEGA for instrumentation, as Jürgen Skowaisa, product management radar, ultrasonic, explains


quare. Practical. Good. Everyone knows the chocolate bars from RITTER SPORT. Quality, safety

and efficiency have top priority in their production. The process starts with the storage of raw materials, for example in the silo building with the six stainless steel silos, three of which are intended for milk powder and three for lactose. From there, the ingredients are distributed into the day silos before they are weighed and blended together with other components in the mixing unit. The environment in the silos is not

exactly a friendly one for level gauges. Temperatures inside are sometimes very high. This places special demands on the sensors. When the silos are being filled, overpressure can build up if the filters get clogged. VEGABAR 82 pressure transmitters are deployed here and for overfill protection, VEGAVIB 63 sensors are used. Together, these instruments protect against excessive pressure and overfilling in the vessel. In addition, special dust explosion protection requirements must be observed. When filling the silos via compressed air, milk powder or lactose is whirled up - such fine materials then settle everywhere, even on the measuring instruments. Exact measurement of the level is absolutely necessary despite these conditions. Until recently, a sensor based on guided microwave technology had been used for level measurement. For point level detection, i.e. protection against silo overfilling, the company had been using a capacitive method. New silos were eventually installed and RITTER SPORT was looking for a state-of-the-art solution.

REliAblE mEASuREd VAluES When VEGA recommended the radar level sensor for bulk solids, VEGAPULS 69, the Waldenbuch chocolate maker was amazed by the vastly more accurate measuring results and the distinct echo curves. This non-contact radar sensor operates at the very high frequency of 80GHz. The direct effect of this higher measuring frequency:


instead of 10°, a DN 80 antenna generates a beam angle of only 3°. As a result, focusing is much tighter and media with poor reflective properties can be detected much more reliably. In addition, the instrument is completely unaffected by buildup, dust or internal vessel installations. Thanks to its particularly good focusing and large dynamic range, VEGAPULS 69 detects poorly reflecting bulk solids reliably even at distances of up to 120m. Although the 11m high silos at RITTER SPORT are not extremely high, the nominal range of the sensor bespeaks the tremendous performance reserves of this measurement technology. The level measuring process is also extremely fast: the cycle time is less than one second with an accuracy of ±5mm. The swivel mount with rinsing air

connection also convinced users. The selected flange version is equipped with a swivelling holder of high-quality stainless steel that allows the sensor and antenna to be optimally aligned in a range of ±10°. The user especially benefitted from the app developed by VEGA, which can be used to adjust the angle of inclination for optimum installation of the measuring instrument. Only the silo data need to be entered: The app then automatically calculates the correct tilt angle. After that, the smartphone or tablet is simply placed on the instrument. The display allows the user to quickly and easily align the radar sensor by means of the swivelling holder. The supplied rinsing connection

clears the antenna of any deposits, although VEGAPULS 69, due to its low sensitivity to buildup, generally delivers reliable measured values even when covered with heavy dust deposits. RITTER SPORT found the option of

parameterising the sensor with the display and adjustment module PLICSCOM via Bluetooth particularly clever. PLICSCOM is used for measured value indication, adjustment and diagnosis directly on the sensor and is the same for all VEGA measuring instruments. The Bluetooth

function now makes it possible to adjust the sensor wirelessly from a distance of approximately 25m. The adjustment functions of the radar sensor can be easily accessed with a smartphone or tablet.

VEGA January 2019 Instrumentation Monthly

Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80