Leveloggers
Rain Gauges & Dataloggers
LT Leveloggers for Level and Temperature Measurement
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See Gold-Junior Comparison sheet for a comparison of features between the two types of Levelogger.
Leveloggers can be suspended and retrieved using a cable (stainless steel preferred) or with a customised direct read cable which enables direct programming and retrieval of data from surface without removing the logger from the borehole. There are minimal component parts above surface, making it possible to totally hide and secure these loggers within the confines of the borehole without modification to existing headworks.
Applications include short term pumping tests and slug tests where rapid changes in water levels over short time periods need to be captured, and longer term monitoring programmes for studying variations in groundwater and surface water levels.
See case histories for examples of use of Leveloggers in a number of diverse environments including the London Olympics site and in water resource work in Darfur.
Waterra can also help with training courses providing advice on good field practice.
For more details:
Leveloggers
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Levelogger Gold (Level and Temperature)
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With a battery that lasts 10 years, and watertight corrosion resistant design, the Levelogger Gold is virtually maintenance free. It provides reliable water level and temperature readings with accuracies of 0.05% and storage capacity up to 40,000 level and temperature data points. It features upgradeable firmware, software, SDI-12 and telemetry options. The Levelogger Gold is able to compensate for altitude, water density and temperature in addition to barometric pressure. A powerful user-selectable recording schedule is built into the easy to use software alongside the standard event-based and linear sampling options. It has an on-board backup of the last 1200 logs. The stainless steel housing has dimensions of 22mm x 154mm and protects against lightning and power surges. The golden Zirconium Nitride coating gives extra corrosion resistance. |
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Levelogger Junior (Level and Temperature)
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The Levelogger Junior is the most recent addition to the Solinst Levelogger family and offers a low cost alternative for measuring groundwater and surface water level and temperature. It combines a data logger, temperature sensor and pressure transducer in one compact, waterproof, stainless steel housing. Compatible with Levelogger Gold Series software and accessories, the Levelogger Junior is able to integrate and communicate with all existing Levelogger systems, including the Leveloader Gold PDA unit. It features a 5 year battery, memory of 32,000 data points, accuracy of 0.1% FS, lifetime calibration, and comes with a 1 year warranty. The Levelogger Junior has the ability to compensate for altitude, water density and temperature in addition to barometric pressure. Easy to use software enables the most commonly used linear time sampling option. The stainless steel housing has dimensions of 22mm x 140mm. |
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Barologger
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The most accurate method of compensating for atmospheric pressure fluctuations in Leveloggers is by use of a Barologger. The Barologger Gold uses algorithms based on air rather than water pressure, which gives superior accuracy. Leveloggers measure absolute pressure (water pressure + atmospheric pressure) expressed in metres or centimeters of water column. This avoids any time lag in the compensation calculation and any errors introduced due to moisture build up, kinking or damage to alternative pressure compensation systems such as vented cable. The recorded barometric information can also be very useful to help determine barometric time lag and/or barometric efficiency of the monitored aquifer - a feature not possible with vented cable. The Data Compensation Wizard in the Levelogger software greatly simplifies the barometric adjustment of the water level measurements by using the synchronized data from one on-site Barologger with all Leveloggers. The overall results give more reliable and highly accurate level data. Barologgers are very accurate devices capable of recording pressure changes equivalent to 1 mm water equivalent or less (approximately 0.1 mbar). The Barologger should remain undisturbed in a fixed position throughout your monitoring programme. Ideally position the Barologger above water level within the top of a borehole casing. Do not carry around in a vehicle or keep within an office environment where anomalous pressure changes can occur. For highest precision and accuracy with water level measurements, use one Barologger per borehole location. In many instances sufficient accuracy is achievable by using 1 Barologger per site or one Barologger covering a 35 km radius. |
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