Transmitters resist chemical attack

Manufacturer of inorganic chemicals,William Blythe, employs a number of pressure transmitters on a plant used to manufacture a halide compound, the corrosive nature of which previously meant two or three transmitters of the eight installed needed to be replaced every 12 months. As the transmitters were based on 4-20mA signalling, there was also no diagnostic information, so failure would occur without warning.

WH Good Automation, an ABB Instrumentation Alliance member, identified a solution in the form of ABB 264HD pressure transmitters.

These have a Hastelloy 2000 seal, which is impervious to the type of damage caused by the chemicals. The first one was installed nearly two years ago and during inspection the seals have proved to have maintained their integrity.

The ABB products have also proved more stable than the previous transmitters, which often drifted.