Full-Size Data Loggers
A complete data acquisition system consists of data logger components, data retrieval components, and software components.
Data Logger Components
Data Loggers: Campbell Scientific data loggers are known for their field reliability and offer compatibility with a wide range of sensors and data retrieval options.
A single data logger can read a large number of sensors provided they are concentrated into a small area. Additional loggers should be deployed if sensors are distributed over a wide area. This keeps signal cables short, reduces problems with noise, and minimizes the potential for damage from construction activities and electrical transients. Cost savings on cable can sometimes pay for the additional loggers.
Interface Modules: Certain types of sensors require additional interfaces. For example, vibrating wire sensors require a VW interface, which is connected between the data logger and a multiplexer.
Multiplexers: Multiplexers increase the number of sensors that can be monitored by a data logger. For example, the CR1000 can control up to seven multi-plexers, each capable of handling 16 to 32 sensors. In practice, the data logger usually controls one or two multiplexers, and additional loggers and multiplexers are employed if there are more sensors.
Power Supplies: A power supply provides regulated power to the logger and sensors. Power is drawn from a battery that is charged from AC mains power or a solar panel.
Weatherproof Enclosures: All field components must be housed in weatherproof enclosures.
Data Retrieval Options
Wired Links: Wired links for data retrieval include direct connection to the PC, telephone modems, and multidrop networks. Wired links are usually less expensive and easier to set up. They are also better for real-time data retrieval.
Wireless Links: Wireless links for data retrieval include cell modems, and spread-spectrum radio modems. Wireless links are useful when distances, site traffic, or other obstacles make wired links impractical. Also, to the degree that wireless links eliminate surface runs of cable, they also reduce problems caused by electrical transients.
Logger Control Software: LoggerNet software is used to create monitoring programs and retrieve data from the logger to the PC.
Custom Programming: Slope Indicator offers custom monitoring programs for Campbell data loggers. The programs, which are created with LoggerNet and can be modified by the user, significantly reduce the time and expense required to deploy the data acquisition system.
Argus Web-Based Monitoring: Processing and distributing the data collected by data loggers can be a daunting task. Atlas Monitoring Software provides an efficient and cost-effective solution to this problem. Atlas automatically processes readings, checks for alarms, displays graphs and generates reports. Distribution is immediate because Atlas works on the Internet. Users can view and download data with their web browsers, whether they are at work, at home, at a client's office, or halfway around the world.
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Full-size Data Loggers Specifications
|DATA LOGGER COMPONENTS
|CR800 Data Logger
|CR1000 Data Logger
|PS100 Power Supply
|AC Adapter, 90 to 260 VAC
|RS-232 Interface Cable
|USB Interface Cable
|ENC 16/18 Enclosure
|AVW200 VW Interface
|System Integration Per Logger
|BASIC DATA RETRIEVAL OPTIONS
|Com200 Telephone modem
|The COMM200 telephone modem is designed specifically for Campbell Scientific data loggers. One modem is placed with each data logger and connected to a telephone line with a dedicated number. Communication is typically initiated by the computer which uses LoggerNet to dial the logger and retrieve the data. Real-time data transfers are possible while connected.
|OTHER DATA RETRIEVAL OPTIONS
|Voice modems, a variation of the telephone modem, can deliver messages to preset phone numbers. Voice modems generally require extra set-up time
|Short Haul Modems
|Short-haul modems are placed with each logger and provide a reliable real-time link between the logger and a computer. The short-haul modem transmits data up to 8 km over a four-wire cable that is routed by the user
|MD9 Multidrop Interface
|The MD9 is placed with each logger. A single coaxial cable links the MD9s into a network. The network can be connected to the controlling computer or a telephone or radio modem
|Cell Phone Modems
|Cell phone modems are placed with each data logger. Some cell services offer IP connections to the modem, so that the long-distance portion of the transmission is carried on the internet
|Spread-Spectrum Radio Modems
|Spreadspectrum modems are placed with each data logger. Communication is typically initiated by the computer. Most countries do not require licenses for these modems
|This software is required for each data logging system. It is used to write and compile monitoring programs, to transfer the program to the data logger, and to retrieve data by direct wire, modem, or radio telemetry
|Slope Indicator offers custom programs written in CR Basic. A typical program excites the sensors, obtains readings, and stores data at preset intervals, but it does not perform data reduction operations. Users can modify the program as needs evolve
|ATLAS WEB SERVICE
|Atlas Activation Fee
|Atlas Monitoring Service
|Atlas is a web service with monthly plans based on the number of sensors to be monitored. The activation fee includes a partial setup of a project. The monitoring service is a monthly charge and includes monitoring of 50 sensors. Additional sensors can be added for a nominal fee