Valeport 308 recording current meter
|Within Vocab||SeaVoX Device Catalogue|
|Alternative Labels||Valeport 308 RCM|
|Definition||A self-recording instrument with speed and direction sensors as standard and optional conductivity, temperature and pressure sensors. Speed is measured by a neutrally-buoyant styrene impeller mounted in a jewelled main thrust bearing and PTFE radial guides. Two magnets are fitted to the impeller and a reed switch fitted inside the pressure housing counts the rotations of the impeller. Direction is sensed using a Valeport two axis, gimballed flux-gate compass. Temperature is sensed by a Valeport platinum resistance thermometer (PRT) or thermistor, depending on the response and specification required. Conductivity is sensed by Valeport Inductive coils and pressure by a strain-gauge transducer. Sensor accuracy is 1.5% for speed, +/- 0.25 degrees for direction, +/-0.02C for PRT temperature, +/-0.1C for thermistor temperature, +/-0.003mS/cm for conductivity and 0.1% to 0.005% full-scale for pressure depending on sensor range. The vector average is based on a 5 second period during which impeller counts are measured and a single compass reading is made. An average period can be any multiple of 5 seconds up to a maximum of 30 minutes. For the optional parameters, the sample is taken at the end of the sample period and averaged over the averaging period. Further information may be found in http://www.bodc.ac.uk/data/documents/nodb/49777/ .|
|Has Current Version||1|
||current meters||Mapping: 477781|
||Valeport Ltd||Mapping: 1448482|
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