Transcript
The National Weights & Measures Laboratory
TEST CERTIFICATE NUMBER GB-1140 Revision 4 Issued by:
National Weights and Measures Laboratory Stanton Avenue Teddington Middlesex TW11 0JZ United Kingdom Notified Body Number 0126
In accordance with
Paragraph 8.1 of the European Standard on Metrological Aspects of Non-automatic Weighing Instruments EN45501:1992. The applied error fraction pi with reference to paragraph 3.5.4 of this standard is 0.50.
Applicant:
Rice Lake Weighing Systems 230 W. Coleman Street Rice Lake WI 54868 USA
In respect of:
The model of an Indicating Device tested as a part of a weighing instrument. Manufacturer: Rice Lake Weighing Systems Type: 920i
Characteristics:
Suitable for a non-automatic weighing instrument with the following characteristics: n ≤ 6000 for Class III instruments with single interval. n ≤ 1000 for Class IIII instruments with single interval. Further details are provided in the Descriptive Annex.
Description and documentation:
The Indicating device is described in the Descriptive Annex. Documents appertaining to this test certificate are held by the National Weights and Measures Laboratory.
Remarks:
The Indicator has been tested and found to conform to the relevant parts of EN45501 and WELMEC Guide 2.1. A summary of the tests performed in support of this Test Certificate is provided in the Appendix to the Descriptive Annex. This Revision replaces earlier versions of the certificate.
Signature:
for Chief Executive National Weights and Measures Laboratory
Date: Reference:
17 October 2007 T1127/0017
TEST CERTIFICATION NO GB-1140 Revision 4
Descriptive Annex 1
INTRODUCTION
This indicating device is designated the 920i Desktop indicator (Figure 1). 2
FUNCTIONAL DESCRIPTION
2.1
Devices: • • • • • • • •
2.2
Semi-automatic zero setting device (≤4% of Max) Zero-tracking device (≤0.5d/s within 4% Max) Subtractive tare device Gross and Net Indicator Semi automatic tare device Pre-set tare device Display test device Time and date function Construction
The indicator housing is fabricated from stainless steel plate. The front panel has a backlit LCD display and a twenty-seven key keyboard, five of the twenty seven keys are programmable software keys (Figure 2). The keys have the following functions: Clear CLR Zero -
clears key entered information. sets the weight display to zero (weight values ≤ 4% of max capacity) and cancels any tare operation. Gross/Net - toggles the current weight indication to be displayed in gross or net weight values. Tare used to enter pre-set tare values or semi-automatic subtractive tare weights. Units toggles between weighing units. Print prints the stable weight information. UP, DOWN, LEFT, RIGHT and ENTER - navigation keys 0-9 numeric keys Decimal point key The LCD also displays the following enunciators to indicate: Stability Centre zero Gross or Net Scale number Weighing unit (kg, g) Semi automatic tare Pre set tare
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The LCD displays the primary weight information, the characters of the weight display shall be at least 9.5mm high. The indicator can be fitted with a two-card expansion board, and may be fitted with any of the following optional cards: Single or dual channel A/D card Analogue output card Dual channel serial expansion card 24 channel digital I/O card Memory expansion card Pulse input card Bus interface card 2.3
Security
Access to the control board and set-up/calibration switch is prevented by the use of screws that have a hole through the head to enable a wire and lead seal to be fitted. 2.4
Drawings
Drawing No. 67612 Astrodyne specification
Description 920I CPU PD-2506 Power supply specification
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TECHNICAL CHARACTERISTICS
3.1
Technical data
Power supply
115 VAC or 230 VAC
Maximum number of scale intervals Loadcell excitation voltage Minimum loadcell impedance Maximum loadcell impedance Minimum input voltage per verification scale interval Measuring range minimum voltage Measuring range maximum voltage Fraction of maximum permissible error Operating temperature range Loadcell cable
6000 ± 5 VDC (10 VDC) 21.875 Ω 2000 Ω 1 micro volt -10 mV 70 mV Pind = 0.50 -10°C to +40°C 6 cores around PVC filler in centre, tinned copper braid, flexible PVC overall jacket. Maximum length = 100 m for 4-wire operation
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Maximum cable length for 6-wire operation Load Cell Impedance
1
Cable size 1
2
2
Unit of length 2
0.2 mm
0.5 mm
1.0 mm
22 Ω
14
33
71
Meters
44 Ω
28
66
142
Meters
87 Ω
56
133
283
Meters
224 535 1134 Meters 350 Ω calculated by dividing the single load cell impedance by the number of load cells
4
INTERFACES
The instrument has the following protected interfaces: RS232 RS485 Analogue output 24 channel digital I/O Pulse input interface Bus interface 5
LEGENDS AND INSCRIPTIONS
5.1 The instrument shall bear the following legends near the display of the weighing result: Max Min e= 5.2
The instrument shall bear the following legends (Figure 3): CE mark Green M Class Serial number Manufacturers mark or name Certificate number
6
LOCATION OF SEALS, VERIFICATION MARKS
6.1 The data plate, CE mark and Green M will be mounted on the right hand side face of the indicator. The data plate will be mounted in such a manner that it is easily accessible and clearly visible in its regular operating position. The CE shall be impossible to remove without damaging it. The data plate shall be impossible to remove without it being destroyed (Figure 3). The markings and inscriptions shall fulfil the requirements of Paragraph 1 of Annex IV of the Directive 90/384/EEC.
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6.2 Screws are used to fix the back plate to the front of the indicator, two of the screws have a hole through their heads so that a wire and lead seal can be fixed between them to prevent their movement, this prevents access to the control PCB. Another large screw is used to prevent access to the set-up/calibration button, this too has a hole through the screw head so that a wire and lead seal can be used to prevent movement. 6.3 Components that may not be dismantled or adjusted by the user will be secured by a wire and lead seal and securing mark. The securing mark may be either: -
a mark of the manufacturer and/or manufacturer’s representative, or an official mark of a verification officer. -
ALTERNATIVES
7.1 Having the 920i Universal mount model, which has the same enclosure as the desktop model. The universal model has the same functionality as the desktop model. There are two option card slots, each slot can handle a dual channel A/D converter board. This allows four scales to be connected to this model. (Figure 4) 7.2 Having the 920i Panel mount model, which can be fitted with a two-card expansion board and has the same functionality as the desktop model. There are four option card slots, each slot can handle a dual channel A/D converter board. This allows eight scales to be connected to this model. (Figure 4) 7.3 Having the 920i Wall mount model, which can be fitted with a six-card expansion board and has the same functionality as the desktop model. There are eight option card slots, each slot can handle a dual channel A/D converter board. This allows sixteen scales to be connected to this model. (Figure 4) 7.4
Having the 920i indicator as described: Applied Weighing International Ltd Unit 5, Southview Park Marsack Street Caversham Reading RG4 5AF United Kingdom TopWeigh Ltd Heathlands Industrial Estate Kingmoor Park Carlisle Cumbria CA6 4RE United Kingdom S&P Waegetechnik GMBH Auf Dem Hoehchen 3 Oberhonnefeld DE 56587 Germany
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7.5 Having the 920i Deep Enclosure model, which is exactly like the Panel mount except it will be in a stainless steel IP66 (water resistant) enclosure and will be able to sit on a desk like the universal model. The Deep Enclosure model has the same functionality as the desktop model. There are four option card slots, each slot can handle a dual channel A/D converter board. This allows eight scales to be connected to this model. (Figure 5) 7.6 Having the indicator designated the 820i (Figure 6). The 820i is the same as the 920i Universal and Panel Mount indicators, with the exception that the 820i has a onecard expansion board and can only handle alphanumeric characters. There are two A/D converters mounted on the CPU Board. This allows two scales to be connected to the 820i at one time. 8
ILLUSTRATIONS
Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6
920i Desktop indicator Front panel display and keyboard Location of data plate and markings 920i Wall mount model, Panel mount model, desktop model and Universal mount model 920i Deep Enclosure model 820i indicator
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TEST CERTIFICATE HISTORY
ISSUE NO. GB-1140 GB-1140 Revision 1
DATE 5 December 2002 23 December 2003
GB-1140 Revision 2 GB-1140 Revision 3 GB-1140 Revision 4
1 June 2004 5 April 2006 17 October 2007
DESCRIPTION Test certificate first issued. Addition of table for ‘Maximum cable length for 6-wire operation’ in section 3.1 Addition of alternative 7.5. Addition of alternative 7.6. Modification to text in alternative 7.1, 7.2, 7.3, 7.4, 7.5 & 8
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APPENDIX TO DESCRIPTIVE ANNEX TESTS CARRIED OUT The following tests were performed with the indicator connected to a small platform incorporating a loadcell (Rice Lake RL 1042-N5), as specified in WELMEC 2.1 section 4.1. EN45501 ref. A.4.6.1 A.4.10 A.5.2 A.5.3.1 A.5.4 B.2.2 B.3.1 B.3.2 B.3.3 B.3.4 B.4
Test Weighing accuracy with tare Repeatability Warm-up test Weighing performance at static temperatures Power voltage variation Damp heat steady state Short time power reductions Bursts Electrostatic discharges Electromagnetic susceptibility Span stability
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Report number s/no: 00432 s/no: 00432 s/no: 00432 s/no: 00432 s/no: 00432 s/no: 00432 s/no: 00432 s/no: 00432 s/no: 00432 s/no: 00432 s/no: 00432
Figure 1
Figure 2
920i Desktop indicator
Front panel display and keyboard.
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Figure 3
Location of data plate and markings.
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920i Wall mount model
920i Panel mount model
920i Universal mount model
920i Desktop model
Figure 4 920i Wall mount model, Panel mount model, Desktop and Universal mount model
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Figure 5
920i Deep Enclosure model
Figure 6
820i indicator
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