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Moisture in Sand – Glass Batching Process  

Moisture content of sand used to manufacture glass is critical. Sand of too low a moisture content produces an excessive amount of dust in the furnace. Too much moisture requires greater usage of energy, increasing cost of production, and affects the quality of the end product.

Glass Production
Sand, glass cullet and other materials, depending on the type of glass are fed into a mixer. Owing to the potentially large variation in moisture content of these constituents the quantity of water that needs to be added to a batch varies. By measuring the moisture content of the main constituent, sand, the guess work can be removed. A feed forward control loop can be used with the automatic water addition system.

Measurement Location
On the sand feed conveyor to the mixer

Gauge Installation
Typically the gauge is installed above a conveyor, approximately 8” from the product, this allows for variations in the sand bed depth. If the gauge is used in a control loop, or the gauge output is continuously recorded, it is important to use a gating device, such as a photo-electric eye. The photo-eye sends a signal to the gauge when it no longer sees product, this causes the gauge to hold its analog output until the photo-eye sees product once again.

 
 
Measurement Performance
Measurement Location Target % Typical Accuracy%
Moisture in Sand Pre-mixer 0-5% 0.1%
  Exit Toaster/Dryer 0-10% 0.2%
 
 
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  Process Sensors Moisture Transmitters

MCT 460: Used in a wide variety of industrial processes, the MCT 460 Multi-Constituent NIR Transmitter, a True Stand-Alone Transmitter, provides off-line accuracy under on-line operating conditions. Read more about the MCT 460 moisture sensors...

MCT 460-T: The MCT 460-T measures moisture... the most critical variable in tobacco processing... providing the world's most accurate, reliable and stable moisture measurement for the tobacco industry. Read more about the MCT 460-T moisture measurement tool...

MCT 460-WP: The MCT 460-WP uses a well proven algorithm which works on a wide range of wood varieties and forms. You choose the mode of operation, stand-alone or networked. Read more about the MCT 460-WP moisture measurement tool...

MCT 330HD: The MCT 330HD features a heavy duty stainless steel enclosure, is resistant to high temperatures, is sealed for wash down environments, and provides reliable, continuous moisture measurement. Read more about the MCT 330HD moisture measurement tool...

MCT 466-SF: The MCT 466-SF features a food grade optical window, a robust stainless steel enclosure, and reliably operates in high temperature locations, measuring moisture, oil & product temperatures. Read more about the MCT 466-SF moisture measurement tool...

MCT 466 QuikCheck: Used for quality control in a wide variety of industrial processes, the MCT 466 QuikCheck bench top NIR Tester provides fast accurate results every time. Read more about the MCT 466 QuikCheck moisture analyzer...

GUARDIAN: The Guardian Scanning Frame System is comprised of three components: MCT-460 NIR Transmitter, the automated Scanning Frame and a PC with Automated Guardian Profile Software. Read more about the GUARDIAN Scanning Frame System...