DataTaker System

The GT 1192/615 data logging system is based on the DT615 Geologger from Data Electronics. The Geologger provides input channesl for 10 sensors of various types, and can be expanded to 30 channels.

Simple text based programmes control the loggers monitoring schedule. Internal data processing and alarm features built into the logger let it perform sophisticated monitoring tasks, such as altering scan rates and channel selections based on input from a particular sensor.

The recorded data is stored as standard ASCII text and may be retrieved by direction connection to a computer, by modem, or by swapping a PCMCIA memory card.

Real-time links, automatic reports, connection to paging services are all possible with optional software such as the Modem Manager and DeLogger Pro Windows. For example, a remote PC connected by modem can display live data and contact a paging service to inform personnel of a potential problem.

Support for Vibrating Wire Sensors

In addition to supporting a wide variety of other types of sensors, the GeoLogger has special features for vibrating wire sensors.

• Frequency range from 600 to 4,500 Hz.
• Resolution to 0.01 Hz.
• Plucking coil resistance from 50 to 300 ohms.
• Balanced pluck pulse excitation, of approximately 150mS duration and up to 36v in amplitude.
• Pulse current source characteristic that provides automatic cable length compensation.
• Pprogrammable delays and sampling times on each channel, to allow for a mix of short and long gauge lengths set at high and low frequencies.
• Single-ended connections for transducers if cable lengths are less than 100 m so that up to 30 transducers may be connected to a single GT1192 or expansion module.
• Measurement of gauge temperature in Deg C by RTD or pluck coil resistance.
• Four screw connections per channel enables the monitoring of both gauge frequency and temperature on a single channel, with cable length compensation (3 or 4 wire connection).
• Programming and data processing enables a number of gauges to be scanned initially to establish datums. Any subsequent data may then be displayed as real changes in engineering units. Temperature corrections may also be applied by cross referencing frequency and temperature measurement channels.
• Audio output loudspeaker for trouble shooting.

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