Level · Measurement
Radar Level Transmitters
Transmitters that time a microwave pulse to the liquid surface. Guided wave radar sends it down a probe inside the vessel; non contact radar beams it from the tank roof.
What it does
Give continuous level and interface on separators and tank level for inventory and overfill alarms. The reading does not depend on fluid density.
Basics
| Guided wave | Probe in the vessel, reads level and interface |
| Non contact | Mounted on the roof, for tanks |
| Output | 4 to 20 mA with HART |
| Watch for | Buildup on probes, foam |
Common failures
- Probe touching the vessel wall or internals
- Heavy foam or emulsion hiding the surface
Troubleshooting
- Symptom
- Level jumps to a fixed value
- Likely cause
- False echo from a nozzle or internal
- What to check
- Rerun the echo mapping, check probe position