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BELT CONVEYOR SCALE "S4a"

BELT CONVEYOR SCALE "S4a"
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APPLICATIONS The belt conveyor scale of "S" line is a microprocessor based equipment specifically designed for industrial plant applications. Typical applications may be: - Stock pile plant handling - Belt feeder flow control - Blending and batching systems MAIN FEATURES - No modifications to the conveyor structure - Weighing area spans from 1 to 4 idler stations - Pulse generating speed transmitter - Optoisolated RS485 serial ports - Optoisolated 4-20 mA flow rate output - Failure alarm hardware output - Optoisolation of all digital inputs/outputs - Periodic self corrections of thermal drift LOAD RECEPTOR Nominal capacity Combined error Zero thermal drift Span thermal drift Maximum load Max Off-center load Operating temp. Stocking temp. Protection Weight/packed volume SPECIFICATION 100 kg ±0,1 % of nom. capacity ±0,0025 % f.s./C ±0,0025 % /C 150% of nom. capacity 10 kgm -20 +50 C -40 +80 C IP67 4 kg / 19 dm3 ELECTRONIC UNIT SPECIFICATION Power supply Load cell supply Load cell quantity Measuring range Overload Speed input Serial outputs Digital outputs Analog output A/D converter Nonlinearity Combined error Thermal drift Auto zero range Flow rate alarm set Alarm differential Measuring period Display Key board Operating temp. Stocking temp. Connections Protection 24 V ca, +10% -15%, 50/60 Hz, 15 VA 11 V d.c., max 140 mA 4 max ±3 mV/V + 5% 1 - 50 Hz RS485 PNP, max 50 mA / 40 V 0/4-20 mA, 750 ohm max 16 bit "sigma-delta" 0,005 % 0,02 % of the span selfcompensated 0 - 5 % 0 - 100% f.s. 0 - 100 % f.s. 13 - 255 msec 9 mm LCD, 2 rows, 16 digits 8 functional keys - 20 + 50 C - 40 + 80 C 2 Screw terminals 2,5 mm2 IP00 IP55 in metal box Ip55 in resine box SPEED TRANSMITTER TVN1 SPECIFICATION Power supply Nominal sensitivity Operating temp. Stocking temp. Protection 24 V d.c. 20 mA 10 mm to steel -20 +50 C -40 +80 C IP65 CELMI s.r.l. Tel +39-0245712209 Largo Brugnatelli 13/16 Fax +39-0245705836 20090 BUCCINASCO (MI) ITALY Internet: www.celmi.com

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OPERATING PRINCIPLE A conveyor scale measures the flow rate and quantity of material transported by a belt conveyor. The "S" conveyor scale uses the most updated thecniques and is made by three key parts: the belt load sensor, the speed transmitter and the electronic unit. The belt load receptor supports one or more idler stations and delivers an electrical signal proportional to belt load. The speed transmitter is installed on a free running drum of the conveyor and delivers a pulse signal proportional to the drum speed and, thus, to the belt speed. The electronic unit receives both...

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THE ELECTRONIC UNIT HARDWARE The hardware of the instrument is made by: The base board equipped with a load cell input multiplexer, a "sigma delta" 16 bits A/D converter for ratiometric measurement, an eight bit "RISC" microprocessor, EEPROM memory for power fai-lure-proof data retention, optoisolated RS485 serial ports, load cell power supply with short circuit protection and an auxiliary 24 V d.c. isolated power supply for external input contacts and one analog 0/4-20 mA output. Remote indicator, 16 characters, 2 rows, LCD display plus eight key keyboard. The optoisolated input/output...

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INSTALLATION The load receptor have to be installed and accuratly aligned as specified in the instruction manual. The speed transmitter have to be installed on a high diameter driven drum (tail or counterweight drum) to avoid slippage. The electronic unit have to be installed on a vertical plane at an height suitable for easy operation (1 - 1,8 meters) in environments with temperature within spec. limits and without humidity condensation, aggressive or explosive vapours. The supporting structure must not have high vibrations; eventually vibration smoothers should be provided. The electronic...

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