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Table of Contents
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1
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2
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3
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4
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5
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5.1
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5.2
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5.3
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5.4
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5.5
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5.6
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5.7
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5.8
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5.9
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5.10
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6
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7
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8
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9
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10
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11
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12
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13
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5.9 LTC (Black Zirconium Oxide) Calibration
Calibration of the second generation LTC, which has a 7-inch long body comprised of Zirconium Oxide is described in this section. The conductivity sensor must be calibrated for reliable conductivity measurements. If the LTC Levelogger has not been in operation for some time, it is recommended that the unit undergo a brief acclimatization session. It is recommended that the LTC Levelogger be placed in tap water for 2 - 24 hours at a fixed sampling rate of 1 minute. Calibrate the LTC Levelogger for conductivity at the start of each new monitoring project or at a minimum each new monitoring season. Calibrating the LTC Levelogger again directly after the monitoring project or season will provide information on the degree of conductivity deviation during the project or season. If necessary, readings can be corrected for any conductivity deviation in a spreadsheet program after the data has been exported. The process of conductivity calibration is performed automatically by use of the Calibration wizard. The user need only place the LTC Levelogger in a specified calibration solution. Conductivity calibration solutions are available from Solinst or any laboratory supply outlet. This LTC has an 80,000 µS/cm conductivity range and can be calibrated at up to 4 calibration standard points:
- 1413 µS/cm
- 5000 µS/cm
- 12,880 µS/cm and
- 80000 µS/cm
The solution(s) must be between 5 Deg C and 30 Deg C during actual calibration. Temperature should remain stable during the 10 - 20 second it takes to perform (each) the calibration.
From within the Levelogger Setting window, start the calibration wizard by clicking the Calibration Wizard icon  . The wizard will guide you through the calibration process.
You can exit the wizard after any step to cancel the calibration session. The logger must be stopped to calibrate.
- Introduction This step is a reminder that the calibration exercise will overwrite all data currently in the LTC Levelogger and that the Levelogger must be connected with the computer during the entire calibration process.
- Set-up The Levelogger Software requires the user to choose the calibration solutions. Ensure the solution is ready in the calibration beaker or container. Start the calibration by selecting [Next].
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 Note:
Ensure that the calibration solution covers the sensor cell grills and the logger is agitated to release entrapped air bubbles (~20ml required if using Solinst supplied test cylinder)
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- LTC Levelogger Rinsing Process. In this step, rinse the Levelogger. Use DI water to rinse the Levelogger first and the further rinse the Levelogger with the displayed calibration solution. Use fresh solution for calibration.
- Calibration. In this step, the current sensor constant and solution temperature from the LTC Levelogger are stated. If the calibration for the specific solution succeeds, the software will go back to step 3 to continue the calibration with the other solution, if selected. If calibration with all the solutions is completed, the new values will be stored in the Levelogger. If the calibration failed, the LTC Levelogger is reset to its pre-calibration state.
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