Sigra’s Field Data Logger is a low power, versatile, eight channel device designed to monitor four types of sensors:

• Vibrating wire
• Voltage        
• Frequency
• Resistance

and with external interfaces it may also be used to monitor additional inputs:

• Current loop
• Strain gauges
• Pulses (via a counter)

Communication

The logger communication can be achieved by:

• Direct cable to PC    
• Data modem – hardwired or mobile
• Built in logger to logger radio link
• High powered logger to logger radio link (optional module)
• Logger to Logger via on board Radio

These options are typically set up in  a fan or daisy chain of loggers on site which communicate with a base station logger connected to a modem on the mobile network. In this configuration data is available on-line.

The basic logger radio is typically capable of 200 to 800 m line of site communication. This range is dependent on site conditions.

Software

Sigra provide software with its loggers that permits administration and data download from a PC under manual control. Software is also available that can be scheduled to undertake automated downloading.

Record on change

The loggers may be programmed to record at a set time interval or to record only if a sensor value differs from the previous value by a configured threshold. This reduces the amount of information to be stored and transmitted.

Alarms

The loggers have an alarm capability that permits them to detect when a value exceeds a threshold value, rate or combination. The logger can then send a warning to a host computer or, if connected by modem, dial a number through the telephone network.

Specifications

• Number of Logging Channels:
  • 8 channels for Voltage, Resistance and Frequency
  • 4 channels may be used for Vibrating Wire Sensors
• Compatible Sensors:
  • Vibrating Wire, 0.5 to 5kHz
  • Voltage output, 0 to 5V
  • Resistance Devices, 0 to 65.6kΩ
  • Frequency, 0.5 to 5kHz
  • Pulse type devices when ftted with optional counter board
• Analogue to Digital Converter:
  • 16bit with precision voltage reference
• Radio Range:
  • 200 to 800m typically
• Operating Radio Frequency:
  • 315.00/433.92 MHz (Country dependent)
  • Does not usually require any licensing arrangements.
  • Aerial:
  • Quarter wave whip. An optional magnetic base mount available for vehicle use.
• Battery:
  • Rechargeable NiMH or single use Alkaline or Lithium AA cells.
• Solar Power:
  • Available for general use.
• Switched Power Out:
  • A 5V supply may be used to power sensors while sampling.
• Environmental rating:
  • The Sigra Logger is housed in a rugged, waterproof case.
• Dimensions:
  • 170 x 100 x 60mm plus aerial.
• Software:
  • For use on PCs running Windows XP or later variations