Decree of the Ministry of Industry and Trade No. 250 / 2001 Coll.
Decree of the Ministry of Industry and Trade laying down requirements for belt conveyor scales marked with EEC mark
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Effective from 21.04.2004
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250
DECLARATION
Ministry of Industry and Trade
of 22 June 2001
laying down requirements for belt conveyor weights marked with EEC mark
The Ministry of Industry and Trade provides, pursuant to Section 27 of Act No. 505 / 1990 Coll., on Metrology, as amended by Act No. 119 / 2000 Coll., ("the Act ') for the implementation of Sections 6 (2) and 9 (1) of the Act:
This decree sets out the requirements for belt conveyor weights which are automatic weighing devices determining the weight of products in bulk without systematic breakdown, the movement of which is continuous and the description of which is given in the Annex to this decree.
Belt conveyor scales may be marked with the EEC type-approval mark and the initial EEC verification mark, the graphic form of which is provided for by a separate legislation, (2) only if they comply with the requirements set out in the Annex to this Regulation, which have been verified in accordance with the procedures laid down in specific legislation.2).
This Regulation shall enter into force on the day of the publication of the sectoral annex to the Protocol to the Europe Agreement establishing an association between the Czech Republic, of the one part, and the European Communities and their Member States, of the other part, on conformity assessment and acceptance of industrial products in the Collection of International Treaties, or on the date of the entry into force of the Treaty of Accession of the Czech Republic to the European Union, if that date is earlier.
Minister:
Doc.
Annex to Decree No 250 / 2001 Coll.
TRAVEL CARRIERS
1. GENERAL CLASSIFICATION OF THE DEVICES BY THEIR OPERATIONS
1.1 Automatic weighing device
Equipment carrying out a weighing operation without operator intervention and activating an automatic process characterising the device.
1.2 Non-automatic weighing devices
Devices which require operator intervention during the weighing process, in particular to store or remove the load from the weight carrier and also to determine the result.
2 TERMINOLOGY
2.1. General
Belt conveyor scales shall be subject to the requirements of points 1 and 2 of Annex 1 to the Specific Legislation (3), unless otherwise provided for in this Decree.
2.2 Classification
2.2.1. By method of determination of quantity
2.2.1.1. Composite conveyor belts:
Belt conveyor scales on which the calculation equipment gradually adds successive partial loads, each corresponding to a particular section of the belt.
2.2.1.2. Integrated conveyor belt weights:
Belt conveyor weights on which the calculation device integrates the product of linear belt load and belt speed according to time.
2.2.2. By type of load carrier
2.2.2.1 Belt conveyor scales with weighing bridge:
Belt conveyor scales where the load carrier called the "weighing bridge" consists of only one part of the belt conveyor.
2.2.2.2. Conveyor belts, together with whole conveyor:
Belt conveyor scales where the whole belt conveyor is a weight bridge.
2.3 Parts of conveyor belt scales
2.3.1. Main components
2.3.1.1 Belt conveyor
Equipment designed to transport products by means of a belt held on rollers rotating around their axes.
2.3.1.1.1 Carrier cylinders
Cylinders through which the belt is carried in a rigid frame.
2.3.1.1.2. Weighting cylinders
Cylinders through which the conveyor belt is placed on the weighing unit load carrier.
2.3.1.2. Weighting unit
The whole or part of a non-automatic weighing device or any other device providing information on the weight of the weighted load.
2.3.1.3. Transport belt displacement sensor
A device connected to a conveyor providing either information corresponding to the displacement of a belt length or information proportional to the speed of the belt.
2.3.1.3.1. Traffic belt displacement sensor
The part of the belt displacement sensor that is permanently connected to the belt.
2.3.1.4. Calculation equipment
Devices for loading partial loads or integration of the product of linear load on the belt and speed of the belt by time, on the basis of information supplied by the weighing unit and the conveyor displacement sensor.
2.3.1.5. Calculation device indicator (quantity counter)
Equipment to obtain information from the calculation equipment and to indicate the weight of the products transported.
2.3.1.5.1. Number counter without zero device (sum counter)
Number of quantities indicating the total weight of all products transported.
2.3.1.5.2. Number counter with zero device
The number of products transported over a specified period of time.
2.3.1.5.3. Additional quantity counter
The number counter with the value of the piece greater than the value of the part of the sum counter, intended to indicate the total weight of the products transported over a longer period of time. This device may be equipped with a zero device.
2.3.1.5.4 Control counter
A device with a panel value less than that of the main sum counter, intended for control purposes.
2.3.1.6 Discharge device
Device by which belt conveyor weights can be set to zero when the belt is running empty at the time of its complete circulation;
The zero setting device may be either non-automatic, semi-automatic or automatic.
2.3.1.6.1. Indicator for zero setting (zero indicator)
The additional counter of the quantity corresponding to the zero device, which can check the zero adjustment of conveyor belt scales at the empty running strip.
2.3.1.6.2 Non-automatic zero devices
Device for monitoring, setting and checking of the operator's belt conveyor scales.
2.3.1.6.3. Semi-automatic zero devices:
a) allows automatic zero adjustment of conveyor belt scales on manual command;
(b) a device indicating on the manual command the value needed to correct the balance to zero.
2.3.1.6.4 Automatic zero devices
Device enabling zero adjustment of conveyor belt scales when the belt runs empty without operator interference.
2.3.2 Additional equipment
2.3.2.1. Equipment for immediate load indication
A device indicating the load mass applied to the weighing unit at any given time.
2.3.2.2. Weighting power indicator equipment
Equipment indicating the immediate weighing capacity either as the weight of the product transported per unit of time or as a percentage of the maximum weighing capacity.
2.3.2.3 Equipment for monitoring functions
Equipment for controlling certain functions, in particular by:
- simulating the effect of constant load on an empty belt (empty running control device with additional mass),
- comparison of two integration at constant load over the same time interval,
- indication of exceeding the maximum load or maximum weighing capacity,
- the user's warning of the error in the operation of conveyor scales, especially in electrical equipment.
2.3.2.4. Weighting power control equipment
Equipment designed to provide programmed weighing power.
2.3.2.5. Quantity preset equipment
A device to stop the supply of material to the conveyor in the event that the quantity of products transported has reached the pre-selected value.
2.3.2.6 Belt displacement simulator
Auxiliary equipment used in tests of conveyor belt scales without conveyor belt and designed to simulate the shift of the belt.
3. METROLOGICAL PROPERTIES
3.1 Value of the quantity counter
Value in mass units equal to:
- in the case of a continuous (analogue) indication, the value of the smallest part of the quantity counter scale (dt),
- in the case of a discontinuous (digital) indication of the difference between two consecutive figures of the quantity counter (dtd).
3.2 Value of the part (d0) of the zero indicator
The figure (d0) of the zero indicator expressed in mass units is equal to:
- in the case of a continuous (analogue) indication, the value of the smallest part of the zero indicator,
- in the case of a discontinuous (digital) indication of the difference between two consecutive figures of the zero indicator.
3.3 Effective length of the weighing bridge (L)
The distance between the axes of the weighing rollers at the extreme points of the weighing bridge, increased by half the distance between the axes of each of these cylinders and the axes of the nearest carrier rollers of the conveyor belt before and behind the weighing bridge.
3.4 Weighting cycle
A group of operations related to each load loading, at the end of which all parts of the calculation device shall return for the first time to their initial position or condition.
3.5 Maximum weight (max) and minimum weight (min) of weighing unit
3.5.1 Maximum gravity
Maximum instantaneous net load on the belt conveyor for which the weighing unit is intended.
3.5.2 Minimum gravity
The net load value below which the use of weighing results may cause an excessive relative error in the addition result.
3.5.3. Weighting range of the weighing unit
Interval between minimum and maximum gravity.
3.6 Maximum weighing power (Qmax) and minimum weighing power (Qmin)
3.6.1 Maximum weighing capacity
Maximum weighing capacity obtained from the maximum weighing capacity of the weighing unit and the maximum belt speed.
3.6.2 Minimum weighing capacity
The value of the weighing capacity below which the weighing results may be burdened by excessive relative errors.
3.7. Medium test weighing capacity (Qe)
The ratio of weighted loads (C) and test duration (t):
Qe = Ct
3.8 Minimum combined load
The minimum added weight of the product below which the weighing result may be influenced by errors greater than the maximum permissible error for each weighing capacity between the maximum and the minimum values.
3.9 Maximum linear belt load
Share of maximum weighing of the weighing unit and weighing lengths:
MaxL
4. DEFINITION OF TRANSPORT CLASS
4.1. Precision classes
Belt conveyor scales are divided into two classes of precision:
Class 1,
Class 2.
4.2 Classification
Belt conveyor scales shall be graded according to their metrological characteristics and characteristics.
4.2.1. Characteristics of Class 1 conveyor belt scales
4.2.1.1. Value of the quantity counter:
The value of the quantity counter shall be:
- less than or equal to 12000weight in one hour at maximum weighing capacity,
- greater than or equal to 150000th of this quantity
4.2.1.2 Value of the zero indicator scale panel (d0):
Without exceeding the value of the quantity counter panel, the following shall be:
- the value of the continuous (analogue) scale piece less than or equal to 120000th of the quantity weighed per hour at maximum weighing capacity,
- the value of the discontinuous (digital) scale piece less than or equal to 140000th of this quantity.
4.2.2. Characteristics of Class 2 conveyor belt weights
4.2.2.1 Value of the quantity counter:
The value of the quantity counter shall be:
- less than or equal to 11000quantities weighed per hour at maximum weighing capacity,
- greater than or equal to 12500 of this quantity.
4.2.2.2. Value of the zero indicator scale element:
Without exceeding the value of the quantity counter panel, the following shall be:
- the value of the continuous (analogue) scale piece less than or equal to 110000quantities weighed per hour at maximum weighing capacity,
- the value of the discontinuous (digital) scale part must be less than or equal to 120000th of this quantity.
4.2.3 Values of scale sections
The values of the sections shall correspond to:
1.10n, 2.10n, 5.10n, n is a positive or negative integer or zero;
However, the values of the zero indicator and control indicator sections need not meet this requirement.
4.2.4 Belt conveyor scales with empty running control device with additional weight
The conditions set out in clauses 4.2.1.2, 4.2.2.2 and 4.2.3 relating to the zero indicator shall also apply to control values indicators.
4.2.5 Minimum weighing capacity
The minimum weighing capacity shall be 20% of the maximum weighing capacity.
5. MAXIMAL IMPORTED FISH
Belt conveyor weights, which are correctly zeroed when running empty, shall, for each weighted quantity, have a greater or equal minimum added load of positive or negative maximum permissible errors below.
5.1 Maximum permissible errors at initial EEC verification
Class 1
0,5% of the total load for each weighing capacity between 20 and 100% of the maximum weighing capacity.
Class 2
1% of the total load for each weighing capacity between 20 and 100% of the maximum weighing capacity.
5.2 Maximum in-service errors
Class 1
1% of the total load for each weighing capacity between 20 and 100% of the maximum weighing capacity.
Class 2
2% of the total load for each weighing capacity between 20 and 100% of the maximum weighing capacity.
6. EXPIRY DATE OF MAXIMAL IMPORTED FISH
6.1 Indicator digital
If the indicator device is discontinuous (digital), the maximum permissible errors shall be increased by one part of the scale of the device.
6.2 Indicator in multiple number
If the belt conveyor scales are connected to several calculators of quantity, the results of each shall not exceed the maximum permissible errors.
The difference between each of the two weighting results for the same quantity of product weighed shall be less than or equal to:
- the value of one part of a discontinuous (digital) indicator device, if the results are given by two discontinuous (digital) indicators,
- the absolute value of the maximum permissible error if the results are given by two continuous (analogue) indicators;
- larger of the following two values:
- the absolute value of the maximum permissible error, or
- the value of one part of the discontinuous (digital) scale,
if the results are given by one continuous (analogue) indicator and one discontinuous (digital) indicator.
6.3 Simulation tests
6.3.1 Maximum permissible positive or negative errors in simulation tests
Section 1:
for each weighing capacity between 5 and 20 per cent of the maximum weighing capacity:
0,07% of the total load at maximum weighing capacity over the test period;
for each weighing capacity between 20 and 100 per cent of the maximum weighing capacity:
0,35% of the total load.
Section 2:
for each weighing capacity between 5 and 20 per cent of the maximum weighing capacity:
0,14 per cent of the total load at maximum weighing capacity for the duration of the test;
for each weighing capacity between 20 and 100 per cent of the maximum weighing capacity:
0.7% of the total load.
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Regulation Information
| Citation | Decree of the Ministry of Industry and Trade No. 250 / 2001 Coll., laying down requirements for belt conveyor weights marked with EEC mark |
|---|---|
| Regulation Type | Order |
| Author | - |
| Collection | Code of Laws |
| Date of Promulgation | 24.07.2001 |
|---|---|
| Effective from | 21.04.2004 |
| Effective until | - |
| Status | Valid |
The regulation text is for informational purposes only.
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