Hydrostatic Submersible Transmitter
The Nivopress N hydrostatic level transmitters are designed to
measure the level of clean or contaminated liquids. The pressure
sensor at the bottom of the probe measures the sum of the
hydrostatic pressure (Phydr) of the liquid column above it and the atmospheric pressure (Patm).
The atmospheric pressure is led to the sensor through a breathing capillary which is equipped with
a moisture filter that prevents the moisture reaching and damaging the electronics.
This enables the atmospheric pressure to be subtracted from the measured pressure to get the hydrostatic
pressure which is proportional to the height of the liquid column (h). The electronics converts the sensor's
signal into an output signal. If temperature measurement (of the liquid) is needed beside the level
measurement a combined (level + temperature) transmitter should be used. The installation and wiring
of the transmitter is helped by the wide variety of
accessories. A sewage adapter working on the principle of
the diving bell can be snapped into the place of the
protecting cap to avoid the direct contact between the sensor
and the measured contaminated liquid.
An extra mechanical protection is built in the NZ type
transmitters in the form of a mechanical filter.
The N-500 types can be used in hazardous environments.
The NZ screw-in types are recommended for applications
where there is a risk of flooding.
- General Specifications
|Measuring Range||0 … 200 m w.h.|
|Overload allowed (versus range)||20x (h ≤ 3 m w.h.) 10x (h > 3 m w.h.)|
|Output||4 ... 20 mA + HART|
|Power Supply||12 ... 30 V DC|
|Linearity (level)||± 0,25 %|
|Temperature Error||≤ ± 0,1 % / 10 K|
|Temperature transmitter NPD, NZD types||Power Supply:12…30 VDC/4…20mA; 0…+60ºC, Accuracy: ±3°C|
|Process temperature||–10 ... +60 °C|
|Mechanical connection||NZ type ¾” BSP thread|
|Ingress protection||IP 68|
|Electrical connection||Shielded cable with breathing capillary|
|Cable||Ø 7 mm; 4x0.34 mm2 Cu + 2x0.14 mm2 St|
|Material of wetted parts||Al2 O3 ceramic, 1.4571|