campbell scientific dataloggers PDF
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Apurva Gollamudi Brace Centre for Water Resources Management 16 June 2009 CAMPBELL SCIENTIFIC DATALOGGERS: AN INTRODUCTION THE DATALOGGER Controlling unit or “brain” of a monitoring system Triggers external devices Initiates measurement of sensors Processes information Stores data Interfaces with communications devices Independent of external control DATALOGGER TYPES Size and Functionality • Portable, hand-held – In-built (sensor) – Industry-standard – Research-grade – Features • Customizable? – Interface options? – Power supply options? – CAMPBELL SCIENTIFIC DATALOGGERS Wiring Panel Connections • Analog input, digital I/O, pulse counters, switched – excitation channels, power and ground, data storage and communications ports Interface and Communications • Direct: CS I/O, Serial, USB, Keyboard, display – Remote: Radio, phone, cellular, satellite – Programming Language • CRBasic, Edlog, ShortCut to Windows (SCWin) – Data Storage • Capacity, format, peripherals – MEASUREMENT AND CONTROL SYSTEMS Peripherals Multiplexers Synchronous devices for measurement Serial data interface Relays Terminal input modules DATA STORAGE AND RETRIEVAL Key considerations Site accessibility Availability of communications services Quantity of data collected Frequency of data collected Monitoring needs ON-SITE OPTIONS TELEMETRY OPTIONS TELEMETRY: CONSIDERATIONS Transmission distance or area Communication rate or throughput Current drain Service requirements SENSORS Climate variables • Temperature – Relative humidity – Barometric pressure – Radiation – Precipitation – Wind speed and direction – Hydrology • Water level – Snow depth – Soil moisture –
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