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WEIGHTRAC 31

WEIGHTRAC 31
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Specification sheet 4 … 20 mA/HART - four-wire Radiometric sensor for mass flow detection Technical data Measuring range Ambient, storage and transport temperature Voltage supply Operating voltage Max. power consumption Analogue input Input type Internal load Switching input Input type ƲƲ Open Collector ƲƲ Relay contact Application area Relay output Switching voltage Switching current Breaking capacity The WEIGHTRAC 31 is a radiometric sensor for precise flow measurement of bulk solids. It is designed for mass flow determination on conveyor belts in all industries. Due to its frame construction, the WEIGHTRAC 31 can be simply retrofitted on the conveyor belt. Current output Range Max. load Your benefit • Wear-free, because non-contact measurement • Exact determination of the delivery volume through simple setup Function In radiometric measurement, a Caesium-137 or Cobalt-60 isotope emits focussed gamma rays. A special sensor on the opposite side of the vessel receives this radiation. The scintillator of the sensor converts these gamma rays into signals, the number of which is detected and evaluated. Since gamma rays are attenuated when penetrating matter, the sensor is able to calculate the level, the limit level, the density and the mass flow rate from the intensity of the received radiation. Switching output Type of output Switching voltage Load current ±1 % from the measuring range final value Extended range available 10 mA 100 mA max. 253 V AC/DC max. 3 A AC (cos phi > 0.9), 1 A DC min. 50 mW, max. 750 VA AC, 40 W DC (with U < 40 V DC) 4 … 20 mA/HART, active or passive 500 Ω (300 Ω with intrinsically safe IS) NPN transistor output (floating) < 55 V DC < 400 mA Materials/Scintillator The detector tube consists of stainless steel, the frame of galvanized steel or stainless steel. Polyvinyltoluene (PVT) is used as scintillation material. Housing versions The housing is available as double chamber version of Aluminium or stainless steel in protection class IP66/IP67. Electronics versions The instruments are available in different electronics versions. Apart from the four-wire electronics with 4 … 20 mA/HART, two purely digital versions with Profibus PA and Foundation Fieldbus are possible. Approvals Worldwide approvals are available for VEGA instruments, e.g. for use in hazardous areas, on ships or in hygienic applications. The technical data in the respective safety instructions are valid for approved instruments (e.g. with Ex approval). In some cases, these data can differ from the data listed herein. You can find detailed information on the existing approvals with the appropriate product on our homepage. VEGA Grie

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The adjustment of the instrument is carried out via the optional display and adjustment module PLICSCOM or via a PC with the adjustment software PACTware and corresponding DTM. The Bluetooth version of display and adjustment module enables a wireless connection to standard adjustment units. This can be for example a PC with PACTware and Bluetooth USB adapter. Here, the adjustment is carried out via the adjustment software PACTware and the respective DTM. Electrical connection Two connection chambers are available. Depending on the instrument version, the signal output is either in the...

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