Radar,Level measurement in liquids
24Pages

Product information Radar Level measurement in liquids VEGAPULS WL 61 VEGAPULS 61 VEGAPULS 62 VEGAPULS 63 VEGAPULS 64 VEGAPULS 65 VEGAPULS 66

Please note the Ex specific safety information that you can find at www.vega.com and that comes with each instrument. In hazardous areas you should take note of the appropriate regulations, conformity and type approval certificates of the sensors and power supply units. The sensors must only be operated on intrinsically safe circuits. The permissible electrical values are stated in the certificate. Take note of safety instructions for Ex appli

Measuring principle 1 Measuring principle Measuring principle VEGAPULS WL 61, 61, 62, 65, 66 Extremely short microwave pulses are transmitted by the antenna system to the measured product, reflected by the product surface and received back by the antenna system. The time from emission to reception of the signals is proportional to the level in the vessel. A special time stretching procedure ensures reliable and precise measurement of the extremely short transmission periods and the conversion into level. The radar sensors operate with low emitted power in the C and K band frequency range....

Type overview 2 Type overview VEGAPULS WL 61 Water processing, pump stations, storm Corrosive liquids in small vessels under water overflow tank, flow measurement in easy process conditions open flumes and level monitoring Storage tanks and process vessels under extremely difficult process conditions Plastic horn antenna Plastic horn antenna/completely PVDF encapsulated Horn antenna or standpipe antenna ½"/316L Process fitting/Material Thread G1½/PBT or mounting strap/316L Thread G1½/PVDF, mounting strap/316L or flange/PP Thread G1½/316L according to DIN 3852A or flange/316L, Alloy C22...

Type overview Aggressive liquids under extremely dif- Liquids under extremely difficult proficult process conditions cess conditions Aggressive liquids under easy process Storage tanks and process vessels conditions under extremely difficult process conditions Completely encapsulated antenna sys- Thread with integrated horn antenna/ Rod antenna, PVDF or PTFE encapsu- Horn antenna or standpipe antenna tem/PTFE, PFA or PVDF PEEK and 316L or Alloy C22 (2.4602), lated, PFA plated 2", 316L plastic horn antenna/PP, flange with encapsulated antenna system/PTFE and PFA Flange or hygienic...

3 Instruments and applications VEGAPULS WL 61 VEGAPULS WL 61 is the ideal sensor for all applications in water and sewage water applications. It is particularly suitable for use in water processing, pump stations as well as overflow basins, for flow measurement in open flumes and gauge monitoring. VEGAPULS WL 61 provides an economical solution through versatile and simple mounting options. The flood-proof IP 68 housing ensures continuous, maintenance-free operation. Level measurement in vessels For level measurement in vessels with conical bottom it can be advantageous to mount the sensor...

Fig. 11: Flow measurement with rectangular overflow: dmin. minimum distance of the sensor; hmax. = max. filling of the rectangular overflow 1 Overflow orifice (side view) 2 Headwater 3 Tailwater 4 Overfall orifice (view from tailwater) Measurement in difficult applications The electronics version with increased sensitivity enables use of the instrument also in applications with very poor reflective properties and products with low εr value.

Selection criteria 4 Selection criteria VEGAPULS WL 61 Simple process conditions Aggressive liquids Bubble or foam generation Wave movements at the surface Flow measurement Front flush installation Threaded fittings Flange connections Hygienic fittings Mounting strap Antenna extension Standpipe antenna Narrow transmission lobe Measurement in a bypass tube or surge pipe Metal production

Measuring range dimensioning 5 Measuring range dimensioning Vessel Applications Storage tank Storage tank with product circulation Stirrer vessel Measurement tubes Applications Surge pipe Free radiating radar possible, ho

Housing overview 6 Housing overview Plastic PBT Protection rating Single chamber Double chamber Application area Industrial environment Industrial environment Protection rating Single chamber Double chamber Application area Industrial environment with increased mechanical stress Industrial environment with increased mechanical stress Protection rating Single chamber, electropolished Single chamber, precision casting Double chamber, precision casting Application area Aggressive environment, food processing, pharmaceutical Aggressive environment, extreme mechanical stress Aggressive...

7 Mounting Installation position The sensor is mounted in a position which is at least 200 mm (7.874 in) away from the vessel wall. If the sensor is installed in the center of dished or round vessel tops, multiple echoes can arise. However, these can be suppressed by an appropriate adjustment. Acid tank Fig. 24: Mounting of the radar sensor on round vessel tops Mounting examples The following illustrations show mounting examples and measurement setups for the individual sensors. Fig. 26: Level measurement in an acid tank with VEGAPULS 61 A non-contact measuring principle is particularly...

Sugar evaporator Storage tank Fig. 30: Level measurement in a storage tank with VEGAPULS 65 The VEGAPULS 65 radar sensor is particularly suitable for level measurement in a storage tank. Fig. 28: Level measurement in a sugar evaporator with VEGAPULS 63 The VEGAPULS 63 radar sensor is particularly suitable for level measurement in the sugar evaporator. Storage tower The PTFE encapsulated horn antenna is protected against contamination or adhesion by the juice. The instrument is gauge and low pressure resistant, even with dynamic pressure and suctions. Process vessels Fig. 31: Level...

Electronics - 4 … 20 mA/HART - two-wire 8 Electronics - 4 … 20 mA/HART - two-wire Configuration of the electronics The plug-in electronics is mounted in the electronics compartment of the instrument and can be exchanged by the user when servicing is required. The electronics is completely encapsulated to protect against vibration and moisture. Connection Single chamber housing The terminals for voltage supply as well as the contact pins with I²C interface for parameter adjustment are located on the upper side of the electronics. In the double-chamber housing, the terminals are located in...