I was alerted to an article related to level measurement. In this case, level measurements were being taken on a river where there was a nuclear power plant nearby. There had been a problem when one of the two level sensors making measurements had a problem and, as a result, they almost had to shut the power plant down. To me this situation underscores two important points:
1.) Process safety sensing can extend beyond the borders of the facility where the process is happening. In a power plant situation you want to know if the cooling water supply is at risk or, as in this case, there is a risk of flooding.
2.) Having redundancy in your process control and/or safety sensing loops prevents errors from happening. Sensor errors could lead to unnecessary shutdowns and lost productivity or, in the worst case, problems and/or undetected problems that cause damage and/or injury.
The article I referenced did not go into details about the sensors in beyond it being a "pressure sensor" measuring level. This could mean two hydrostatic (pressure) sensors being deployed to measure differential pressure or two independent sensors making the measurements at close proximity to each other. In either case, it does underscore the need for redundant sensing when critical processes are being controlled or safeguarded.
On a related note, be on the lookout for a set of surveys supporting our Process Level and Inventory Tank Gauging (ITG) market research that we will likely be deploying after the July 4th holiday weekend. There will be opportunities for Process Level and ITG suppliers and users to win significant prizes. Stay on the lookout for an alert blog here and/or a VDC or launch partner e-mail that announces them.