EchoPro Strain Bridge Monitor Logger
PRODUCT FEATURE

Application
Environmental Systems & Services’ strain bridge monitor logger is a portable instrument for the measurement of resistance strain gauges and strain gauge based instruments. It’s particularly adapted for use with the CSIRO Hollow Inclusion Stress Cells.
Commonly used in mining, civil and laboratory applications it can measure 12 quarter-bridge strain gauges and one thermistor continuously.
Many strain gauge based transducers are available for measuring force, pressure, acceleration, soil stress, water potential and other parameters.
CSIRO Hollow Inclusion Stress Cells are used to measure triaxial stress in rock or concrete.

Main Features
• Continuously monitors 12 quarter-bridge strain gauges and one thermistor
• Thermistor value is displayed in Ohms and degrees C
• Data is recorded to USB memory stick
• USB memory stick is not required for operation, only for recording
• Time and date of recording is encoded in the filename
• User can manually set the time and date via the keypad/LCD
• Time and date is saved in a battery-backed real-time-clock
• Ability to null the offset at any time
• Ability to start and stop the recording at any time
• Recording status is displayed on the LCD
• Every time a new recording is started, a new file is created
• Adjustable LCD contrast
• Time is displayed on the LCD (updated each second)
• Displays battery voltage, internal temperature and USB memory statistics
• USB memory stick is automatically mounted/unmounted when inserted or removed
• LCD backlight turns off 2 minutes after last keypress
• Firmware is upgradeable via USB memory stick
• Data will only be recorded if USB stick is actually inserted

Operating Principle
The strain bridge monitor logger provides bridge excitation and simultaneous digital display output for up to 12 strain gauge inputs of quarter bridge configuration. The unit is supplied in a rugged carry case together with internal rechargeable batteries and a 220/240V AC mains recharger.
The HI Cell is simply wired directly into the rear panel. The logger has a convenient start function to begin and stop logging prior to or at the conclusion of overcoring.
It will record the entire process smoothly without the need of pausing drilling to take readings as in the past. Recording status is displayed on the LCD screen allowing the user to track measurements while drilling progresses. Ten samples per second are recorded while data is written to the USB every five seconds. Data is easily transferred from logger to PC via the USB stick. The file format is the same as the stress Isotropic program allowing simple hassle free download and data analysis. The logger has the ability to null the offset at any time by pressing the Zero button. Temperature is recorded and displayed on the LCD in both ohms and degree Celsius. This is handy for keeping track of drill water temperature during overcoring. Firmware is upgradable via the USB stick.

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