You offer two types of pressure gauges – how do I choose one over the other?
RBR standard instruments with a "D" in the name, such as RBRcoda³ D, RBRsolo³ T.D, or RBRconcerto³ C.T.D.ODO.Tu, use piezoresistive pressure (depth) sensors. Electrical resistance of such a sensor changes when pressure is applied. The sensor consists of a measuring cell immersed in oil and covered by a flexible diaphragm. Any pressure applied to the diaphragm is transferred through the oil to the measuring cell. A clear plastic cover protects the diaphragm from deformation. Ensure the cover is in place and avoid touching the sensor.
The piezoresistive pressure sensor has initial accuracy of ±0.05% full scale and is recommended for most applications.
Specification | Description |
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Range Plastic housing Titanium housing | 20 / 50 / 100 / 200 / 500 / 750dbar 1000 / 2000 / 4000 / 6000dbar |
Initial accuracy | ±0.05% full scale |
Resolution | <0.001% full scale |
Typical stability | ±0.05% full scale / year |
Time constant | <10ms |
The RBRquartz³ family of instruments uses the Paroscientific Digiquartz® pressure sensor for best-in-class initial accuracy and low drift performance. Its operation principle is based on a precision quartz crystal resonator whose frequency of oscillation varies with pressure-induced stress. The resonant frequency outputs are maintained and detected with oscillator electronics similar to those used in precision clocks and counters. See Paroscientific: Resonant Quartz Crystal Technology for more details.
The quartz sensor has exceptionally high stability and initial accuracy of ±0.01% full scale, which come at a much higher price. For example, RBRquartz³ Q | plus is almost ten times more expensive than RBRvirtuoso³ D | wave16.
The RBRquartz³ instruments are recommended for long-term specialised applications, where their high resolution for sensing small changes in water level is crucial.
Specification | Description |
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Range Q, Q | plus BPR, APT BPR | zero | 20/55/125/190/260dbar 4000 / 7000dbar 1000 / 2000 / 4000 / 7000dbar |
Initial accuracy | ±0.01% full scale |
Resolution Q, Q | plus BPR, BPR | zero, APT | 100ppb (at 1Hz sampling rate) 10ppb (at 1Hz sampling rate) |