Temperature plays a significant role in many product manufacturing processes. Where a tempering machine is used, this is a permanently installed device that is responsible, as an integral component of a production plant, for tempering a mould or chosen tool in the manufacturing process.
KELLER recently supplied PR-21Y piezoresistive pressure transmitters to a client that produces oil and water tempering machines.
The consistent temperature of the tool or mould is a critical factor in the quality of the finished product. Water or oil is most commonly used as a medium for transporting heat, but other fluids can also be used, depending on the application. Tempering machines often serve both a heating and a cooling function.
The medium is brought to a specific temperature and added to the process through a system of pipes. There, the medium transfers the heat or cold as energy. This can then go back to the tempering machine in a closed circuit to top up the used energy once more.
The purpose of a tempering machine is to provide the manufacturing process with the desired temperature and to keep this constant. Temperature sensors are used to check the target temperature.
Keller, which is locally represented by Instrotech, recently supplied a PR-21Y piezoresistive pressure transmitter to a client specialising in developing and producing oil and water tempering machines. The Keller 21Y transmitters are used to ensure pressure monitoring on the tank of the tempering machine. An overpressure, which can result from the heating of the medium, can be prevented with the help of pressure monitoring. A constant pressure of 16 bar is set. The transmitters from the Y range are particularly suitable because they have a very low temperature error range.
Keller’s 21Y piezoresistive pressure sensor is welded, fully insulated and encapsulated with no internal seals. Its robust stainless steel housing and compact design make it suitable for space-critical industrial applications, heat pumps, air conditioning technology, and the food industry. The 21Y’s direct analogue signal path with high bandwidth guarantees high, long-term stability.
For more information visit: www.instrotech.co.za
