campbell scientific dataloggers

18 Pages·2009·1.22 MB·English

by  Apurva Gollamudi

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
–