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Level Measurement 2
1
Transcript
Level Measurement
2
- Suitable for open and closed tanks
- Able to provide local and remote indication
Possible errors
- Density variations
- Blocked and damaged dip tubes
- Can be used in deep tanks
- Suitable for explosive atmospheres
- Suitable for high temperatures and pressures
- No direct contact with the tank wall is necessary
- Two or more rods can be used
- The longest rod is used as the referance electrode in plastic vessels
Differential Pressure Cell
(D. P. Cell)
Output signal is propotional to the difference between the high and low pressure connections which are connected to the cell
Pressure Operated Devices
P = h.p.g
Simple Capacitor
Diaphragm
Gas Purged LevelSystem
Hydrostatic Level System
Will be discussed under pressure measurement
Devices used with solids
Electrical Sensing Devices
Capacitance Sensing
Conductance Sensing
(conductive liquids)
(non conductive liquids)
Anjana Tharanga
Emitter Devices
Signals (waves) are reflected by the surface of the liquid
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