- Compact size, ideal for fitting into pipes and smaller tanks
- Simple installation
- Direct contact with measuring medium
- Unaffected by external factors eg. contaminants, buildup, foam, vessel geometry, etc.
The hydrostatic level sensor works by converting changes in the resistance of a piezo-resistive bridge, while are proportional to the pressure (of a hydrostatic column of liquid), into a standard current output signal. The active sensing device is a silicon diaphragm with in diffused piezo-resistors. The (non-uniformized) electrical signal obtained from the piezo-resistive bridge is proportional to the input pressure (depth) and is converted by the electronic circuit into an output signal.
The relationship between the height of the liquid and the hydrostatic pressure in a constant liquid and at atmospheric pressure, can be written as follows:
Hydrostatic pressure: ρ x h x g
ρ = density of the liquid
h = height of the liquid
g = 9.81 m/s 2 , constant, the Earth’s acceleration of gravity (at sea level)
- Measuring ranges up to 500 m H₂O
- Probe: AISI 316 L
- Diaphragm: Hastelloy
- Protection against overloads
- ATEX or DNV certification
BAMO Nivapress SGE25 probe is immersed in the liquid. The pressure on the sensor increases proportionally with the depth of immersion. The pressure is measured at the immersion depth of diaphragm, connected to atmosphere through a capillary inside the cable. The active sensing element is a piezo-resistive type isolated by a very strong Hastelloy diaphragm. An electronic amplifier operating in connection with the sensor, converts the measurement into a 4-20 mA or 0-10 V analog signal. The anti-surge circuit protects the instrument from damages caused by atmospheric disturbances or high power devices.
