Concept
Plessey recording current meter model 9021
| URI | http://vocab.nerc.ac.uk/collection/L22/current/TOOL0577/ |
|---|---|
| Within Vocab | SeaVoX Device Catalogue |
| Preferred Label | Plessey recording current meter model 9021 |
| Definition | An axial flow impeller current meter designed to operate at depths to 2000 m (6000 m optional), and in temperatures from -5 to 40 degC. Forward currents rotate the impeller clockwise, and reverse currents rotate it anticlockwise (starting speed 1.5 cm/s; speed range 2.5 to 500 cm/s; accuracy greater of 2 cm/s or 2 percent). A counter is magnetically coupled to the impeller, and records net current speed over the sample period. A vane with horizontal stabiliser fins aligns the impeller with the current flow (minimum current velocity for alignment 3 cm/s). Current direction is measured by magnetic compass (360 degree range; accuracy 3 degrees; resolution 1.4 degrees; tolerated tilt rangeis -1 degrees to 4 degrees, or up to 40 degrees if gimballed). A solid state crystal clock measures time (accuracy better than 2 sec/day). Optional sensors include platinum resistance thermometer (range -2 to 35 degC; accuracy 0.1 degC; 99 percent response time 15 sec), pressure sensor (accuracy 0.5 percent of full scale; response time 10 msec), conductivity sensor and sample counter. |
| Broader |
L05:
current meters |
| Related |
B75:
British Oceanographic Data Centre, Liverpool |
| Note | accepted |
| Deprecated | false |
| Alternative Label | Plessey 9021 |
| Version | 1 |
| Has Current Version | http://vocab.nerc.ac.uk/collection/L22/current/TOOL0577/1/ |
| Authored On | 2012-12-18 15:09:37 |
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