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DISCONTINUOUS TOTALIZER
Common alternative names: flow scale, automatic dosing scale, flow meter, flow weighing system.
English: automatic discontinuous totalizing weighing systems (ADTWS),
bulk-weighing scale, bulk hopper scale.
The automatic weighing machine uses: A. In applications for internal, industrial, unregulated use. B. In commercial transactions, under the European Union Directive 2004/22 / EC MID (Measuring Instrument Transposed by H.G. 264/2006 for establishing the conditions for placing on the market and putting into operation the measuring instruments, Annex MI-006 (automatic weighing machines) and H.G. 891/2004 on the establishment of measures for market surveillance of products in the regulated fields, provided in Law 608/2001 on the assessment of product conformity. Evaluation of the conformity of the gravimetric dispenser with automatic operation with the requirements The essential elements are carried out by applying the evaluation procedure of compliance (module B + module F):
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The mechanical and electropneumatic assembly is formed
from three containers (feeding vessel, weighing vessel and
emptying vessel) between which two mechanisms operate
electro-pneumatic: supply flap and flap
emptying which ensures the controlled succession of cycles
suitable alternatives (feeding and emptying).
The automation table includes the digital indicator of
multi-function weighing and relay module
for complete process control and connectivity
afferent.
The supply vessel is positioned under a power source
existing food (hopper, conveyor belt,
elevator, etc.).
After the supply flap opens, the material
flows from the feed vessel to the weighing vessel (flap
drain under the weighing pan is closed).
When the pre-programmed weight value is reached in the weighing vessel, the feed flap closes, the gross weight value (GROS) is stored and the drain flap opens to discharge the weighed contents from the weighing vessel into the emptying vessel which normally , discharges simultaneously into the existing emptying system (another buffer hopper, elevator, conveyor belt, truck, wagon, ship).
The emptying vessel discharges the goods at a lower flow rate than the one
with which he unloads the weighing vessel, preventing
thus overloading the downstream drainage systems.
When the weighing vessel is emptied, the drain flap closes and the value of the weight of the material that may have remained in the weighing vessel, the so-called tare value (TARA), is stored.
During this time, the material continues to flow and accumulate in the feed vessel (in other words, the feed is made in a continuous flow, without interrupting the elevators and conveyor belts). The program of the digital weighing indicator calculates the net weight value (NET = GROSS-COUNTRY) of the batch, adds it to the cumulative value of the previous batches [resulting in TAW Total Actual Weight] and initiates a new batch by resuming the process.
A discontinuous totalizing device operating in the regulated field to ensure the correctness of commercial transactions must be subjected to metrological tests related to the legislation in force. The weighing vessel itself is a relatively simple machine, very easy to inspect; the problem is its location. In most flow dosing installations, the product travels a long and often complex route. The inspection of a flow weighing system requires knowledge of the entire system and includes both tests to verify the accuracy of the scale itself and tests of all interlocks to verify the integrity of the global freight transfer at the installation level (receipts or deliveries).
| Working temperatures | |
|---|---|
| Mechanical and electropneumatic assembly | -40°C..+65°C |
| Automation panel | -10°C..+40°C |
| Peripheral equipment (PC station, printer, accessories) | +10°C..+35°C |
| Electrical network parameters | |
|---|---|
| Supply voltage | 230Vca±10% |
| frequency | 50Hz±1% |
| installed power | 650VA |
| potential between the protection null of the mains supply and the earthing belt | 0 (zero) |
| earthing resistance | maximum 1Ω |
| Instrumental air |
|---|
|
Dry compressed air source: minimum 6Bar / 500l / min Punct de rouă: +3°C Filtrare particule solide: 0.1μm |
| Models by Flow [m3/h] | ||||
|---|---|---|---|---|
| 1st series | 2nd series | 3rd series | 4th series | 5th series |
| < 100 | 200-400 | 600-800 | 1000-1200 | > 1500 |
