Standardisation of temperature transmitters

19 August 2008

Following the installation of an ABB TTF3000 temperature transmitter more than a year ago, Rugby cement has decided to use the products as standard throughout its Warwickshire, UK based plant.

‘The two things that make this transmitter especially suitable for us are it is rugged and very easy to program,’ electrical engineer, Andrew Pitt said, highlighting simple configuration without a laptop or computer as a particular benefit.

It is vital to keep the giant kiln turning at the plant that produces 4200 tonnes of cement each day. The transmitter is designed to ensure smooth operation by monitoring the temperature of one of the bearings responsible for carrying the enormous weight of the kiln.

The only thing keeping the two faces of the white metal bearing apart is a thin layer of lubricant. If the bearing temperature starts to rise, it can indicate a problem with the lubricant, trouble with the lubricant supply system or excessive load because of a problem with the kiln. An alarm trips if the temperature climbs to 80oC for any reason, because excessive temperatures will damage the bearing and engineers need to be able to spot a rising temperature fast.

“The first transmitter has been installed for more than a year already without needing any maintenance. We’ve just installed two more and will now be using them as standard,” Pitt added.

ABB has designed the TTF300 HART temperature transmitter to replace its proven head-mounted TH202 transmitters. The TTF300 can be configured easily thanks to the built-in LCD display. It also offers enhanced diagnostic information compared to its predecessor.

The transmitter includes a universal sensor input for RTDs, thermocouples, Ohms or mV and also offers sensors drift detection and built in sensor redundancy which reduces down-time and increases maintenance intervals. The unit gives a 4-20mA output signal with digital HART and offers an accuracy of 0.1 per cent with long-term stability of 0.05 per cent per year. The IP66, IP67 and NEMA 4X aluminium or stainless steel field-mountable housings make the transmitter suitable for really tough environments.

The TTF 300 is part of ABB’s new generation of HART transmitters. Featuring SIL2 certification from TUV, it is designed for a wide range of safety critical applications, including chemical processing and oil and gas applications.

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