With many different measurement technologies available, however, it is possible to choose automatic tank gauge with different measurement technologies for BPCS and SIS that, nevertheless, have similar measurement performances, offer self-diagnostic features, and are certified by reputed third-party safety assessors.
One practical, proven solution is to use a radar type continuous electronic sensor automatic tank gauge for the BPCS with a servo type continuous electronic sensor, for the SIS, or vice-versa. Such a solution meets the main objectives of process control and enhanced safety:
- Comparable and redundant measurements.
- Self checking continuous type electronic sensors.
- High accuracy and performance to ensure safe operation so that safety function thresholds can be kept sufficiently high to maximize storage capacity.
- Proof testing of automatic tank gauge can be logged with automatic event listing for documentation requirements of BPCS and SIS maintenance.
- Flexibility to program another alarm in the control system for where the difference in measurement between the automatic tank gauge technologies exceeds a set value.