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CTD48 – Probe The CTD48 is a small and handy micro processor controlled multiparameter probe for accurate measurements of pressure, temperature and conductivity

Main Features low weight easy handling max. 4 sensors corrosion free housing depth range up to 2000 m SDA data acquisition software runs under Windows® 95/98/ Me/2000/XP Calculation of sound velocity and salinity according to UNESCO formulas

The probe is especially designed for limnological measurements on lakes rivers and estuarys but can be used also in shallow water and in the oceanographic range up to 2000 m depth. The probe is equipped with a 4 channel 16 bit data acquisition system of high long-term stability which meets the high precision requirements necessary for oceanographic measurements.

Materials housing: titanium connector: titanium, neoprene

Due to its low weigth the CTD48 is well suited for portable applications without winches. In this case the probe has to be supplied by battery and data is transmitted via RS 232 port to PC, laptop or portable field unit. A 4,3mm multiconductor cable is the connection between PC and probe and can be used up to several hundred meters distance.

Dimensions and weights

The CTD48 is well suited for borehole applications. The small diameter allows measurements in boreholes from 2” to 4” size.

Electrical specifications


Power: 9…30 VDC Current consumption: 30 mA Serial port: RS 232 Port specifications : 1200,o,8,1 Data transmission : 5 CTD sets/s Option: FSK telemetry Connector: MCBH4M Ti

The probe and sensors are made of corrosion free materials. Housing and sensor protection tube have a rugged design. Standard models are: 1. CTD 2. CTD + fast oxygen sensor * 3. H2S-probe with P, T, pH, H2S * * see separate data sheets

(housing).approx. 210 mm (housing).........……48 mm (overall)...approx. 400 mm (in air).....approx. 1,0 kg

Figure: CTD48 with C, T, D, sensors

The probe can be powered by battery or DC-power supply (9 to 30 Volt) when using RS-232 output or optional by constant current with FSK telemetry output (coaxial connection) for longer distances. FSK telemetry requires an additional interface for constant current supply and frequency demodulating

Standard sensor equipment Sensors Pressure Temperature Conductivity Conductivity Sound velocity

Principle piezo-resistive full bridge Pt 100 7-pole quartz cell 7-pole quartz cell Calculated

Range 10, 20, 50, 100, 200 bar - 2 ... + 36 °C 0 ... 60 mS/cm 0 ... 6 mS/cm 1400...1600m/s

Accuracy ± 0,1 % FS

Resolution 0,002 % FS

Response time 150 ms

± 0,005 °C ± 0,010 mS/cm ± 0,005 mS/cm

0,0006 °C 0,001 mS/cm 0,0001 mS/cm 0,01m/s

150 ms 150 ms 150 ms

System configuration: FSK telemetry

Sea & Sun Technology GmbH Erfurter Str. 2, D-24610 Trappenkamp Germany Tel.: 0049 (0) 4323-910913 Fax: 0049 (0) 4323-910915 e-mail: internet:

Distributed by:

Mariscope Ingeniería. Ruta 550. Puerto Montt. Teléfono 65 971231.

In view of our policy of continual improvement, the design and specifications of our products may vary from those illustrated in this brochure.

Sonda Sea and Sun Technology