SBE 27 pH/O.R.P. (Redox) Sensor

The SBE 27 pH and O.R.P. (Redox) sensor combines a pressure-balanced, glass-electrode, Ag/AgCl reference probe and platinum O.R.P. electrode to provide in-situ measurements at depths to 1200 m. The replaceable pH probe is permanently sealed and is supplied with a soaker bottle attachment that prevents the reference electrode from drying out during storage. The sensor is a modular, self-contained package that is easy to install, service, and calibrate. The SBE 27 is intended for use as an add-on auxiliary sensor for profiling CTDs (SBE 9plus; SBE 19, 19plus, and 19plus V2 SeaCAT; and SBE 25 and 25plus Sealogger). Power / signal interface cables and mounting hardware are available separately.

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Key Features Specifications Resources Content

Key Features

Voltage output; interface electronics buffer and offset the differential voltages of the pH reference junction and the electrode potential (in water) between the O.R.P. electrode and pH reference junction to produce pH- and O.R.P.-dependent output voltages.
Factory calibration results tabulated on a certificate furnished with each sensor: - pH calibrated against precision buffer solutions (4, 7, and 10 pH ± 0.02 pH). - Extremely stable O.R.P. circuitry does not require subsequent calibrations.
1200 m housing.
Supplied with plastic soaker bottle and KCl soaker solution.
Seasoft© V2 Windows software package (computation of pH and O.R.P. in engineering units).
Five-year limited warranty.

Parameters Measured

Specifications

Specification	Value
Communication Options	analog
Depth Rating (Meters)	1200m
Power Source	External
Housing Material Options	Aluminum, Titanium
Connector	MCBH
Sampling Rate	1 sec pH, 10 msec ORP
Power Consumption	6 to 24 VDC, 10 mA
Accuracy	± 0.1 pH, ± 1.0 mV O.R.P.
Software	Seasoft© V2