The sensor (SBE27-0198) combines a pressure balanced glass-electrode, Ag/AgCl reference probe, and a platinum O.R.P. electrode (1200 m rated).
The HydroC instrument package capable of measuring pCO2, polyaromatic hydrocarbons, and methane in situ (Contros, Systems and Solutions, Germany), is mounted to the Video-CTD frame. The sensors (CH4, CO2) store internal high resolution binary data, moreover, the sensors (PAH, CO2, CH4) are also connected to the SBE9plus unit by serial cable and analogue data signals (0-5 V) are recorded online during CTD stations. An overview of the Contros HydroC sensors and their features is shown in Table 1.
Table 1: HydroC sensor specifications given by CONTROS.
| HydroC TM / CH4 | HydroC TM / PAH | HydroC TM / CO2 |
Measuring range | 200 nM – 50µM | 0-500 ppm | 200-1000 ppm |
Resolution | 15-19 nM | 0.1 ppm | 1 ppm |
Response time (t63) | 2 min | 0.5 s | 1 min |
Warm-up time | ~ 30 min | Less than 10 s | ~30 min |
Operational depth | 4000 m | 500 m | 4000 m |