Improve Polyethylene Terephthalate (PET) Production with Siemens LR560 Level Transmitter

Siemens LR560 Level Transmitter

PET is an abbreviation for polyethylene terephthalate, which is the chemical term for polyester. 

PET is a transparent, robust, and lightweight plastic widely used in packaging foods and beverages, particularly convenience-sized soft drinks, juices, and water. PET is used to make almost all single-serving and 2-liter bottles of carbonated soft drinks and water sold in the United States. 

PET containers are produced in two stages, employing injection molding and blow molding machinery. 


Storage tank monitoring of crystalline PET plastic pellets used to make plastic soft drink bottles is essential. The crystalline pellets have a density ranging from 30 pounds per cubic foot to 56 pounds per cubic foot, and the storage tanks can be up to 60 feet tall. 

Level measurement is crucial for inventory control and sustaining material availability during production times. If the inventory is running low, production needs to know whether or not tanks will need to swap. 

Some plants measure levels with a plumb-bob, and some use ultrasonic level transmitters. The plumb bob cord becomes a mechanical inconvenience, and due to excessive dust levels, the ultrasonic level devices experience frequent echo loss. 


The Siemens LR560 transmitter provides a continuous, consistent, and low-maintenance level measuring solution. The SITRANS LR560 unit's plug-and-play capability is appropriate for most solids level monitoring applications, even those requiring severe dust and high temperatures. Its one-of-a-kind design allows for safe and simple programming with the intrinsically safe handheld programmer without the need to open the instrument's lid. 


Savings in time 

  • Significantly reduced maintenance. Because the SITRANS LR560 radar transmitter is non-contact, there is no risk of product contamination or extended delays when plumb-bob cables become entangled or break. 

Process dependability has increased. 

  • Continuous level measurement provides a precise temporal indicator of how much is in the silo. When a plumb-bob wire becomes trapped at a certain distance, the accurate level data is lost. There is no level history before the last on-demand request from the instrument after the line is attached. 

Simpler to use 

  • The SITRANS LR560 transmitter employs a quick start wizard and requires no more calibration or maintenance. 


The local user interface facilitates setting and setup. Customers can save money by shifting the indicating component from unit to unit as needed because they only use the removable, local display during setup. The narrow, 4-degree beam angle allows for consistent depth penetration into the silo while ignoring possible silo wall interference. 

The SITRANS LR560 2-wire, 78 GHz FMCW radar level transmitter monitors solids in silos over a 100-meter (328-foot) range. Its plug-and-play performance is suited for most solids applications, including those with high temperatures up to +392oF and severe dust. Its one-of-a-kind design allows for safe and straightforward programming with the intrinsically safe handheld programmer without the need to open the instrument's lid. 

The SITRANS LR560 transmitter offers an optional graphical local display interface (LDI) that facilitates setup and operation by providing diagnostic support via an intuitive Quick Start Wizard and echo profile display. The QuickStart wizard makes it simple to get started, with only a few parameters needed for basic functioning. The SITRANS LR560 equipment monitors almost any solids material level up to 328 feet. 

Contact Process Technology, Inc. at 801-264-1114 or visit to discuss this or any other process instrument application.