The deep SBE41 and SBE61 use the same pressure sensor – a 7000dbar Kistler. And, they are calibrated with the same Paroscientific Digiquartz reference. However, the calibration process is different. A deep SBE41 receives a 2-point sensor only temperature compensation for pressure. The initial accuracy for a deep 41 is +/- 7dbar, typical stability is 2dbar/year. A 61 receives a 4-point temperature compensation for pressure after the instrument is completely assembled, such that the correction includes both the sensor and the electronic boards. The initial accuracy for a 61 is +/-4.5dbar, typical stability is 0.8dbar/year.
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