PROCESS WEIGHING system

The system is capable of providing reports on product wise, date wise, weight wise, cumulative weight etc.

The new Electronics is designed with highly reliable Programmable Logic Controllers (PLC) used widely in industries such as Ferro Alloy plants, Refractories, Animal Feed etc. This system requires a Personal computer (PC) and comes with Windows based software for easy interaction. Using one overhead conveyor and one weighing station material can be distributed (tipped) at various points and information on weight gathering.

A hardy weight indicator comes with standard two set point output options and RS232C option. Various option cards can be added on in the future. Hardy equipment employs a six-digit alphanumeric Red LED Display and has an accuracy of 0.0015% (non-linearity).

Hardy Instruments are most popular world over and in India for such applications. They are unique in design and cannot be compared to any other indicators available in the world. The Model HI-2151 Weight Controller uses patented WAVER SAVER?, Technology that eliminates plant / process vibration, so that accurate weighment can be done always. Further this product has internal resolution of over 10 lakh internal counts and 9.85 lakh display counts. Because of that, it can tolerate large dead load, over-sizing of the loadcells and still have a huge resolution to work with. The internal resolution offered by Hardy equipment is 25-50 times more than the typical ordinary weight controller resolution, offered by others in the market.

Hardy Weight Indicator

The level of the ingredients in the tank is sensed by the level sensors place at the low and high level so that it senses both the positions accurately. Tank is provided with pneumatically operated doors at the bottom, which opens according to the sensing of the sensors. The temperature of the tank is maintained by water circulating around the tank by using tubes. These temperature controlling is maintained by the Allen Bradley PLCs. The weight of the tank is displayed locally by using displays. This would be useful for the operator. The mimic present in control centre provides complete details of the tank weighing system.

The tank weighment system consists of tank / reactor or a silo, which contains the ingredients to be measured. The tank has a stirrer to mix up the materials in it. Due to the agitating motion or mechanical vibration of the tank, measurement cannot be done through normal weight indicators. To ensure accurate weighing by eliminating vibrations, Hardy based weight indicators are used.

Manual and semi-automatic production processes result in in-accurate weighment, Costly labour and long time, Automatic Tank Weighing System provides very accurate and automatic weighing for this purpose.

Solution

Measurement of tank while it is stable is of no difficult by using normal electronic weigh indicators. But no ordinary type electronic weight indicators will be useful for weighing reactor vessels / tanks especially if the reactors are going to be ON (agitating) when the weighment has to be done.
Mechanical vibration generated by the reactors cause huge distortion in the loadcells output which further will be amplified by these ordinary type weight indicators. As such, such weight indicators cannot be employed for accurate weighment at all.

In many process industries, handling and mixing a wide variety of Raw materials in a specified proportion, has been an important production process. For proper batching of raw materials the tank in which it is contained is to be accurately measured. In this regard, tank weighment system is very essential.