The Centro di Taratura e Metrologia Oceanografica (CTMO) is the marine metrology and calibration facility of the Oceanography Section of the OGS (Istituto Nazionale di Oceanografia e Geofisica Sperimentale). It provides the Section with the scientific and technical infrastructure necessary for making and guaranteeing high-quality observations of the marine environment in a way that continuously meets recognized international standards of excellence. A critical element of the services offered is the ability to calibrate and maintain sea-going instrumentation efficiently. The facility is run applying relevant international guidelines and protocols as much as practically possible in order to assure conformity or, at least, compatibility, with the regulatory standards governing this kind of activity worldwide. The CTMO is manned by a small team of experienced personnel, which also oversees the facility’s continuing scientific and technological development.
Thermally-regulated and humidity-controlled, the Centro di Taratura e Metrologia Oceanografica is currently equipped with primary physical standards, secondary transfer standards and support equipment for performing high-quality calibrations of devices or sensors measuring temperature and conductivity (salinity) able to meet the demanding oceanographic measurement specifications for these parameters.
It is also endowed with a number of instruments for making standard electrical measurements of various kinds and functional tests, evaluations and validations of sensors used for measuring some other commonly monitored marine environmental parameters.
Temperature calibration set-up Fluke Calibration 1595A Super-Thermometer (Fluke Hart-Scientific) with metal-sheath Hart Scientific Model 5699 Standard Platinum Resistance Thermometer (SPRT) and/or SBE 35 Deep Ocean Standards Thermometer (Seabird Electronics, Inc.); Hart Scientific 7312 Triple Point of Water (TPW) Maintenance Bath with Jarrett B13 and Hart Scientific 5901 TPW cells; Hart Scientific 9230 Melting point of Gallium (MpGa) Maintenance Bath with Hart Scientific 5943 MpGa cell; L&N 4030B and Guildline 9930 reference resistors.
Uncertainty: Typical expanded measurement uncertainty (95% level of confidence; k=2) for temperature: 0.0034 °C (ITS-90). Conductivity/salinity calibration set-up Custom Seawater Calibration Bath (Fluke 7BATH-019-25, s/n B3A024), capacity: 270 L; Hart Scientific 7052 temperature calibration bath, compatible for use with seawater; Guildline 5010 Programmable Fluid Bath, compatible for use with seawater; Fluke Calibration 1595A Super-Thermometer (Fluke Hart Scientific) with metal-sheath Hart Scientific Model 5699 Standard Platinum Resistance Thermometer (SPRT) and/or SBE 35 Deep Ocean Standards Thermometer (Seabird Electronics, Inc.); SBE 4 conductivity sensor, coupled with a SBE 31 Multi-channel Counter (Seabird Electronics, Inc.) SBE41 CP-OGS Temperature and Conductivity Monitor Guildline Autosal 8400B Laboratory Salinometer; Guildline 8410 Portable Salinometer; Certified IAPSO Standard Seawater.
Uncertainty: Typical expanded measurement uncertainty (95% level of confidence; k=2) for conductivity: 0.00054 Siemens/m.
Other key test instrumentation Desgrange & Huot 5400E Primary Pressure Standard (pressure balance) with calibrated masses; Millipore Elix 3 Water Purification System; Hach 2100AN IS Laboratory Turbidimeter; Anton Paar DSA 5000 M density and sound velocity meter; Thermo Scientific Orion 2-Star pH meter; Metrohm 888 Titrando titrator (with accessories) Kongsberg Contros HydroC/CO2FT dissolved CO2 sensor; Druck DPI142 laboratory barometer; Acculab Atikon 623-v balance; Kern EW 12000-1nm balance; SBE 31 Multichannel counter (Seabird Electronics, Inc.); Fluke 5522A Multi-product Calibrator; Narda EMR300 Electromagnetic Radiation Monitor; HP-Agilent 34401A digital multimeter; Rigol DM3058 digital multimeter; HP-Agilent E3631A programmable DC power supply (2 units); Rigol DP831 programmable DC power supply; Rigol DP711 programmable DC power supply.
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